1Conpack_params(3NCARG) NCAR GRAPHICS Conpack_params(3NCARG)
2
6 Conpack_params - This document briefly describes all Conpack internal
7 parameters.
8
10 Parameter descriptions follow, in alphabetical order. Each description
11 begins with a line giving the three-character mnemonic name of the
12 parameter, the phrase for which the mnemonic stands, the intrinsic type
13 of the parameter, and an indication of whether or not it is an array.
14 'AIA' - Area Identifier Above - Integer Array
16 Each element of the parameter array 'AIA' is an area identifier
17 for the area above the contour level specified by the
18 corresponding element of the parameter array 'CLV'. The
19 corresponding element of the parameter array 'AIB' is an area
20 identifier for the area below that level. If, for a particular
21 contour level, both 'AIA' and 'AIB' are zero, that level is
22 ignored by the routine CPCLAM; otherwise, contour lines at that
23 level are added to the area map and the given values of 'AIA'
24 and 'AIB' are used as right and left area identifiers,
25 respectively. (Note that contour lines are traced with greater
26 values to the right and lesser values to the left.)
27 There are three special elements in the parameter array 'AIA',
29 corresponding to 'PAI' values of -1, -2, and -3; the first
30 specifies an area identifier for the area outside the edge of
31 the grid, the second an area identifier for any area filled with
32 special values, and the third an area identifier for any area in
33 which the mapping routine CPMPXY returns the "out of range"
34 value 'ORV'.
35 If contour levels are chosen automatically, rather than being
37 supplied by the user, the value supplied for the Ith element of
38 'AIA' is I+1 and the value supplied for the Ith element of 'AIB'
39 is I.
40 The default value of element "-1" of 'AIA' is 0 and the default
42 values of elements "-2" and "-3" are -1's.
43 'AIB' - Area Identifier Below - Integer Array
45 See the description of 'AIA', above.
46 'CAF' - Cell Array Flag - Integer
48 The parameter 'CAF' determines the way in which the routine
49 CPCICA (which is called to store color indices in a user cell
50 array), gets from an area identifier associated with a
51 particular cell to a color index for that cell. Let IAID be the
52 area identifier that is associated with a given cell. Then:
53 · If 'CAF' is negative, the routine CPSCAE is called. The
55 default version of CPSCAE behaves as follows: if the
56 value of IAID is greater than or equal to zero, it itself
57 is stored in the cell array as a color index; otherwise,
58 the cell array is unchanged. A user version of CPSCAE may
59 be supplied to do something more complicated; since the
60 value of 'CAF' is one of the arguments of CPSCAE, its
61 value may be used to select one of a number of color-
62 setting schemes built into the routine.
63 · If 'CAF' is positive, the value "'CAF'+IAID" is computed.
65 If that value is positive, it is stored in the cell array
66 as a color index; otherwise, the cell array is unchanged.
67 In this case, 'CAF' acts as an offset, mapping the area
68 identifiers to a unique portion of the color table.
69 The default value of 'CAF' is 0.
71 'CFA' - Constant-Field Label Angle - Real
73 The parameter 'CFA' specifies the angle (in degrees
74 counterclockwise from a vector pointing to the right) at which a
75 constant-field label is to be written.
76 The default value of 'CFA' is 0.
78 'CFB' - Constant-Field Label Box Flag - Integer
80 If 'CFB' is zero, the constant-field label will not be boxed at
81 all. The value 1 implies that the perimeter of the box is to be
82 drawn (in the same color as the label) after the label is drawn.
83 The value 2 implies that the box is to be filled (in the color
84 specified by 'LBC') before the label is drawn. The value 3
85 implies both of the above.
86 The default value of 'CFB' is 0.
88 'CFC' - Constant-Field Label Color Index - Integer
90 If 'CFC' is less than zero, the constant-field label and the
91 box, if any, around it, will be drawn in the color specified by
92 the current text color index; if 'CFC' is greater than or equal
93 to zero, then it specifies the desired color index for the label
94 and the box. If a box is drawn around the label, it is made the
95 same color as the label itself.
96 The default value of 'CFC' is -1.
98 'CFF' - Constant-Field-Found Flag - Integer
100 The parameter 'CFF' may not be set by the user; its retrieved
101 value will be non-zero if and only if CPRECT, CPSPS1, or CPSPS2
102 detected a constant field.
103 The default value of 'CFF' (prior to any call to CPRECT, CPSPS1,
105 or CPSPS2) is zero.
106 'CFL' - Constant-Field Label Line Width - Real
108 If 'CFL' is less than or equal to zero, line width will not be
109 set before drawing a box around the constant-field label. If
110 'CFL' is greater than zero, it specifies the desired width, as a
111 multiple of the "normal" line width.
112 The default value of 'CFL' is 0.
114 'CFP' - Constant-Field Label Positioning Flag - Integer
116 The parameter 'CFP' says how the constant-field label is to be
117 positioned. There are nine possible values, each of which
118 specifies a point of the label box which is to lie on the point
119 defined by 'CFX' and 'CFY': the value -4 implies the lower left-
120 hand corner of the label box, -3 implies the center of the
121 bottom of the box, -2 the lower right-hand corner of the box, -1
122 the center of the left edge of the box, 0 the center of the box,
123 +1 the center of the right edge of the box, +2 the upper left-
124 hand corner of the box, +3 the center of the top edge of the
125 box, and +4 the upper right-hand corner of the box. Left, right,
126 bottom, and top are defined from the viewpoint of someone
127 viewing the label right-side up.
128 The default value of 'CFP' is 0, so the constant-field label
130 will be centered on the point whose coordinates are 'CFX' and
131 'CFY'.
132 'CFS' - Constant-Field Label Size - Real
134 The parameter 'CFS' specifies the nominal size (width) of a
135 character in the constant-field label, as a fraction of the
136 width of the viewport. This nominal size is multiplied by 'CWM'.
137 The default value of 'CFS' is 0.012.
139 'CFT' - Constant-Field Label Text String - Character
141 The parameter 'CFT' specifies the text of the constant-field
142 label, which is written when a constant data field is detected;
143 it is a character string of at most 40 characters. The embedded
144 string '$ZDV$' will be replaced by the numeric value of the
145 field.
146 If 'CFT' is given the value ' ' (a single blank), the constant-
148 field label will not be written.
149 The default value of 'CFT' is 'CONSTANT FIELD - VALUE IS $ZDV$'.
151 'CFW' - Constant-Field Label White Space Width - Real
153 The parameter 'CFW' specifies the nominal width of white space
154 to be left around the constant-field label, as a fraction of the
155 width of the viewport. This nominal width is multiplied by
156 'CWM'.
157 The default value of 'CFW' is 0.005.
159 'CFX' - Constant-Field Label X Coordinate - Real
161 The parameter 'CFX' specifies the X coordinate of the basepoint
162 of the constant-field label. The given value is mapped linearly
163 onto the viewport; 0 refers to the left edge of the viewport and
164 1 to the right edge of the viewport. Values less than 0 or
165 greater than 1 may be used.
166 The default value of 'CFX' is 0.5, so the constant-field label
168 is centered horizontally in the viewport.
169 'CFY' - Constant-Field Label Y Coordinate - Real
171 The parameter 'CFY' specifies the Y coordinate of the basepoint
172 of the constant-field label. The given value is mapped linearly
173 onto the viewport; 0 refers to the bottom edge of the viewport
174 and 1 to the top edge of the viewport. Values less than 0 or
175 greater than 1 may be used.
176 The default value of 'CFY' is 0.5, so the constant-field label
178 is centered vertically in the viewport.
179 'CIS' - Contour Interval Specifier - Real
181 See the description of 'CLS', below. When 'CLS' is greater than
182 zero, 'CIS' is used. A value of 'CIS' less than or equal to zero
183 indicates that Conpack is to choose the contour interval (see
184 the descriptions of the parameter arrays 'CIT' and 'LIT'). A
185 value of 'CIS' which is greater than zero is the actual contour
186 interval to be used; in this case, 'LIS' may be given a non-zero
187 value "n" to specify that every "nth" contour level should be
188 labeled. See also the descriptions of 'CMN' and 'CMX', below.
189 The default value of 'CIS' is 0.
191 'CIT' - Contour Interval Table - Real Array
193 Each non-zero element of the ten-element parameter array 'CIT'
194 is a real number greater than or equal to 1 and less than 10;
195 when Conpack picks the contour interval, it chooses a number of
196 the form "c x 10**k", where "c" is one of the elements of 'CIT'
197 and "k" is an integer. The non-zero elements of 'CIT' must be
198 sorted in ascending order and appear at the beginning of the
199 array.
200 The corresponding elements of the parameter array 'LIT' specify
202 which contours are to be labeled. A contour at "nc x 10**k" is
203 labeled if "n" is a multiple of "l", where "l" is the element of
204 'LIT' corresponding to the element "c" of 'CIT'. For example, if
205 the first element of 'CIT' is "1." and the first element of
206 'LIT' is "5", then Conpack is allowed to use contour levels 1.,
207 2., 3., 4., etc., with labels at 5., 10., 15., etc. (5 x 1., 5 x
208 2., 5 x 3., etc.).
209 The default contents of 'CIT' and 'LIT' are as follows:
211 'PAI' 'CIT' 'LIT' LEVELS ALLOWED LABEL INTERVAL
214 ----- ----- ----- -------------- --------------
215 1 1.0 5 1.0 x 10 ** K EVERY 5TH ONE
216 2 2.0 5 2.0 x 10 ** K EVERY 5TH ONE
217 3 2.5 4 2.5 x 10 ** K EVERY 4TH ONE
218 4 4.0 5 4.0 x 10 ** K EVERY 5TH ONE
219 5 5.0 5 5.0 x 10 ** K EVERY 5TH ONE
220 6 0.0 0 FILLER TO END FILLER TO END
221 7 0.0 0 FILLER TO END FILLER TO END
222 8 0.0 0 FILLER TO END FILLER TO END
223 9 0.0 0 FILLER TO END FILLER TO END
224 10 0.0 0 FILLER TO END FILLER TO END
225 'CIU' - Contour Interval Used - Real
227 The parameter 'CIU' is normally intended for retrieval only.
228 When the selection of the contour interval is left up to
229 Conpack, 'CIU' is given the value chosen. When contour levels
230 are completely set by the user, the value of 'CIU' may need to
231 be set as well, for two reasons: 1) to make the desired value
232 appear in an informational label (in place of the embedded
233 string '$CIU$') and 2) so that it may be used by the penalty
234 scheme for positioning labels. The setting of 'CIU' must be done
235 after setting the contour levels (because, as a side effect of
236 the setting of element 1 of 'CLV', 'CIU' is zeroed). If the user
237 supplies contour levels, but supplies no value of 'CIU', and the
238 penalty scheme is used to position labels, the required contour
239 interval is estimated; in certain situations, this can lead to
240 problems (if, for example, the same contour level appears twice
241 in 'CLV', once to force lines at that level to be drawn and once
242 to force that level to be used as the boundary for a shaded
243 area).
244 The default value of 'CIU' is 0.
246 'CLC' - Contour Line Color Index - Integer Array
248 Each element of the parameter array 'CLC', if greater than or
249 equal to zero, is a color index for contour lines at the level
250 specified by the associated element of 'CLV'. A value less than
251 zero implies that the lines will be drawn in the color specified
252 by the current polyline color index.
253 There are three special elements in the parameter array 'CLC',
255 corresponding to 'PAI' values of -1, -2, and -3; the first
256 specifies a color index for the edge of the grid, the second a
257 color index for the edge of any area filled with special values,
258 and the third a color index for the edge of any area in which
259 the mapping routine CPMPXY returns the "out of range" value.
260 The default value of each element of 'CLC' is -1.
262 'CLD' - Contour Line Dash Pattern - Character Array
264 Each element of the parameter array 'CLD' is a dash pattern (as
265 expected by the package Dashline) to be used (when 'DPU' is non-
266 zero) to draw contour lines at the level specified by the
267 associated element of the contour level array 'CLV'. Elements of
268 'CLD' may be set using a call to CPSETI, with a sixteen-bit
269 integer as the second argument, or using a call to CPSETC, with
270 a character string of 32 or fewer characters as the second
271 argument. In either case, the result will be a character string
272 internally; a sixteen-bit integer will be converted to a
273 sixteen-character string by mapping 0-bits into apostrophes and
274 1-bits into dollar signs.
275 There are three special elements in the parameter array 'CLD',
277 corresponding to 'PAI' values of -1, -2, and -3; the first
278 specifies a dash pattern for the edge of the grid, the second a
279 dash pattern for the edge of any area filled with special
280 values, and the third a dash pattern for the edge of any area in
281 which the mapping routine CPMPXY returns the "out of range"
282 value.
283 When Conpack picks the contour levels, the default value
285 supplied for each associated dash pattern is the character
286 constant '$$$$$$$$$$$$$$$$'. This is also the default value for
287 each of the three special elements.
288 'CLL' - Contour Line Line Width - Real Array
290 Each element of the parameter array 'CLL' specifies the line
291 width used to draw contour lines at the level specified by the
292 associated element of the contour level array 'CLV'. Each is
293 expressed as a multiple of the "normal" line width; values less
294 than or equal to zero imply that line width should not be set.
295 There are three special elements in the parameter array 'CLL',
297 corresponding to 'PAI' values of -1, -2, and -3; the first
298 specifies a line width for the edge of the grid, the second a
299 line width for the edge of any area filled with special values,
300 and the third a line width for the edge of any area in which the
301 mapping routine CPMPXY returns the "out of range" value.
302 When Conpack picks the contour levels, the default value
304 supplied for each associated line width is 0. This is also the
305 default value for each of the three special elements.
306 'CLS' - Contour Level Selection Flag - Integer
308 This parameter must be set prior to the call to CPRECT, CPSPS1,
309 or CPSPS2 which initiates the process of drawing a particular
310 contour plot; it specifies how contour levels are to be
311 selected, as follows:
312 · If 'CLS' has the value "0", Conpack will not pick contour
314 levels at all; the current values of the parameters
315 'NCL', 'CLV', and associated arrays will not be changed.
316 They will thus retain the values chosen by Conpack during
317 a previous call or the values supplied by the user.
318 · If 'CLS' has a negative value of the form "-n", Conpack
320 will generate "n" contour levels, splitting the range
321 from the minimum field value to the maximum field value
322 into "n+1" equal intervals.
323 · If 'CLS' has a positive value of the form "+n" and 'CIS'
325 is less than or equal to zero, Conpack will use values of
326 the form "bk", where "b" is a "base" value chosen by
327 Conpack and "k" is an integer. The base value "b" will be
328 a "nice" value (as defined by the contents of the
329 parameter array 'CIT'), chosen in such a way as to give
330 at least "n" contour levels (with the default contents of
331 the array 'CIT', you may get as many as "2n" levels).
332 · If 'CLS' has a positive value of the form "+n" and 'CIS'
334 is greater than zero and 'CMN' is greater than 'CMX',
335 Conpack will use values of the form "'CIS'*k", where "k"
336 is an integer.
337 · If 'CLS' has a positive value of the form "+n" and 'CIS'
339 is greater than zero and 'CMN' is less than or equal to
340 'CMX', Conpack will use values of the form
341 "'CMN'+'CIS'*k" which are greater than or equal to 'CMN'
342 and less than or equal to 'CMX', where "k" is an integer.
343 The default value of 'CLS' is 16.
345 'CLU' - Contour Level Use Flags - Integer Array
347 Each element of the parameter array 'CLU' indicates how the
348 associated contour level, in the parameter array 'CLV', is to be
349 used. The value 0 means that no contour line is to be drawn at
350 the associated level, the value 1 that the line is to be drawn
351 without labels, the value 2 that the labels are to be drawn, but
352 not the line, and the value 3 that both the line and the labels
353 are to be drawn.
354 There are three special elements in the parameter array 'CLU',
356 corresponding to 'PAI' values of -1, -2, and -3; the first
357 specifies a flag for the edge of the grid, the second a flag for
358 the edge of any area filled with special values, and the third a
359 flag for the edge of any area in which the mapping routine
360 CPMPXY returns the "out of range" value. In each case, if the
361 flag is zero, the associated edge is not drawn; otherwise, the
362 associated edge is drawn.
363 When Conpack chooses the contour levels, the associated elements
365 of 'CLU' are given one of the two values 1 or 3, depending on
366 whether the line is to be labeled or not. The default values of
367 the special elements are all zeroes.
368 'CLV' - Contour Level Values - Real Array
370 Each of the first 'NCL' elements of the parameter array 'CLV' is
371 a contour level for which something is to be done (the drawing
372 of contour lines, the drawing of contour labels, and/or the
373 addition of contour lines to an area map).
374 Only elements 1 through 'NCL' may be accessed via the parameter-
376 setting routines. Thus, code to set the contour levels and
377 associated quantities must begin with a call to set 'NCL'.
378 A side effect of setting the element numbered 'PAI' of 'CLV' is
380 that the associated element number 'PAI' in each of the
381 parameter arrays 'AIA', 'AIB', 'CLC', 'CLD', 'CLL', 'CLU',
382 'LLC', and 'LLT' is also given a default value, as follows:
383 'AIA' ´PAI'+1
385 'AIB' ´PAI'
387 'CLC' -1
389 'CLD' ´$$$$$$$$$$$$$$$$'
391 'CLL' 0
393 'CLU' 1
395 'LLC' -1
397 'LLT' ´ ' (a single blank)
399 Thus, in code to set contour levels and associated quantities,
401 each contour level must be set before the quantities associated
402 with it.
403 A side effect of setting element number 1 of 'CLV' is that the
405 parameter 'CIU', which indicates what contour interval was used,
406 is zeroed. It is assumed that this will only happen when the
407 user is providing all the contour levels, in which case the
408 concept of the "contour interval" may or not be well defined.
409 See the description of 'CIU' for more information.
410 'CMN' - Contour Minimum - Real
412 When 'CLS' is greater than zero and 'CIS' is also greater than
413 zero, if 'CMN' is less than or equal to 'CMX', then the contour
414 levels used will be of the form 'CMN', 'CMN'+'CIS',
415 'CMN'+2*'CIS', ... , 'CMN'+n*'CIS', where "n" is the largest
416 integer such that 'CMN'+n*'CIS' is less than or equal to 'CMX'.
417 The labeled levels will be those for which "n" is a multiple of
418 'LIS'.
419 The default values of 'CMN' and 'CMX' are 1 and 0, respectively.
421 'CMX' - Contour Maximum - Real
423 See the description of 'CMN', above.
424 'CTM' - Character Temporary - Character
426 The parameter name 'CTM' refers to a temporary character buffer
427 in Conpack; the name may be used in the routine CPCHCL to get
428 the dash pattern for the current line and in the routines
429 CPCHHL, CPCHIL, and CPCHLL to get the text of the label being
430 written or to change it.
431 The parameter 'CTM' has no meaningful default value.
433 'CWM' - Character Width Multiplier - Real
435 All character size parameters are multiplied by 'CWM'; this
436 makes it easy to scale the sizes up or down simultaneously.
437 Parameters affected by this are 'CFS', 'CFW', 'DPS', 'DPV',
438 'HLS', 'HLW', 'ILS', 'ILW', 'LLS', and 'LLW'.
439 The default value of 'CWM' is 1.
441 'DPS' - Dash Pattern Size - Real
443 The parameter 'DPS' specifies the nominal size (width) of a
444 character in a dash pattern, as a fraction of the width of the
445 viewport. This nominal size is multiplied by 'CWM'.
446 The default value of 'DPS' is 0.010.
448 'DPU' - Dash Pattern Use Flag - Integer
450 If 'DPU' is less than or equal to zero, it means that no dash
451 patterns are to be used and that contour lines are to be drawn
452 using calls to CURVE. If 'DPU' is non-zero, it means that dash
453 patterns are to be used and that contour lines are to be drawn
454 using calls to CURVED. When the label positioning flag
455 ABS('LLP') = 1, contour lines are caused to be labeled by using
456 a dash pattern formed by concatenating "n" repetitions of the
457 appropriate element of 'CLD' (the nominal dash pattern for the
458 line) and the appropriate element of 'LLT' (the numeric label
459 for the line); in this case, 'DPU' specifies the value of "n".
460 The default value of 'DPU' is 3.
462 'DPV' - Dash Pattern Vector Length - Real
464 The parameter 'DPV' specifies the nominal length of the solid
465 vector generated by a dollar sign, or the gap vector generated
466 by an apostrophe, in a dash pattern, as a fraction of the width
467 of the viewport. This nominal length is multiplied by 'CWM'.
468 The default value of 'DPV' is .005.
470 'GIC' - Group Identifier for Contour Lines - Integer
472 The parameter 'GIC' specifies the group identifier for contour
473 lines added to an area map by the routine CPCLAM.
474 The default value of 'GIC' is 3.
476 'GIL' - Group Identifier for Label Boxes - Integer
478 The parameter 'GIL' specifies the group identifier for label
479 boxes added to an area map by the routine CPLBAM.
480 The default value of 'GIL' is 3.
482 'GIS' - Group Identifier for Strips - Integer
484 The parameter 'GIS' specifies the group identifier for a group
485 of edges added to an area map by the routine CPCLAM to create a
486 set of vertical strips. This is done only if the parameter 'NVS'
487 (which is described later in this section) is non-zero.
488 The default value of 'GIS' is 4.
490 'HCL' - Hachure Length - Real
492 The parameter 'HCL' specifies the hachure length, stated as a
493 fraction of the width of the viewport. A positive value implies
494 the use of hachures on the downslope side of the contour. A
495 negative value implies the use of hachures on the upslope side
496 of the contour.
497 The default value of 'HCL' is .004.
499 'HCS' - Hachure Spacing - Real
501 The parameter 'HCS' specifies the hachure spacing, stated as a
502 fraction of the width of the viewport. This is the distance
503 between one hachure and the next along a contour line.
504 The default value of 'HCS' is .01.
506 'HCF' - Hachuring Flag - Integer
508 The parameter 'HCF' is the hachuring flag, with one of the
509 following values:
510 · If 'HCF' = 0, hachuring is turned off (the default).
512 · If 'HCF' = 1, all contours will be hachured.
514 · If 'HCF' = 2, closed contours will be hachured only if
516 the interior of the contour is "downhill". Open contours
517 will be unconditionally hachured.
518 · If 'HCF' = 3, closed contours will be hachured only if
520 the interior of the contour is "downhill". Open contours
521 will be unconditionally unhachured.
522 · If 'HCF' = 4, closed contours will be hachured only if
524 the interior of the contour is "downhill". Open contours
525 will be hachured only if the "interior" of the contour is
526 "downhill", where "interior" is defined by computing the
527 total change in direction along the contour. If that
528 total is positive, the "interior" is to the left; if it
529 is negative, the "interior" is to the right.
530 Negative values of 'HCF' may also be used. Each has the same
532 effect as the corresponding positive value, except that the word
533 "downhill" in the definition above is replaced by the word
534 "uphill".
535 The default value of 'HCF' is 0.
537 The user will be expected to increase the value of the internal
539 parameter 'RWC' ("Real Workspace for Contours") from its default
540 100 to a value large enough to accommodate any contour that can
541 arise from his/her data field; this may require increasing the
542 size of the real workspace array. (This is so that the hachuring
543 routine is assured of seeing all of each contour line.
544 Otherwise, it can't tell which way the "inside" and the
545 "outside" of the closed contours are.)
546 Closed contours that are broken into pieces that appear to be
548 open contours (either because portions of the closed contour
549 disappear as a result of the mapping implied by non-zero values
550 of the parameter 'MAP' and the out-of-range value 'ORV', or
551 because they run through special-value areas, as defined by the
552 internal parameter 'SPV', or because the user has forgotten to
553 increase the value of 'RWC', as described in the previous
554 paragraph), will be hachured. The rationale for this is that no
555 real confusion can arise from hachuring a contour line which
556 shouldn't be, only from not hachuring one that should be.
557 'HIC' - High Label Color Index - Integer
559 The parameter 'HIC' is used in determining the color index for
560 high labels. See the description of 'HLC', below.
561 'HIT' - High Label Text String - Character
563 The parameter 'HIT' specifies the text string to be used in
564 labeling a high. See the description of 'HLT', below.
565 'HLA' - High/Low Label Angle - Real
567 The parameter 'HLA' specifies the angle (in degrees
568 counterclockwise from a vector pointing to the right) at which
569 high and low labels are to be written.
570 The default value of 'HLA' is 0.
572 'HLB' - High/Low Label Box Flag - Integer
574 If 'HLB' is zero, high and low labels will not be boxed at all.
575 The value 1 implies that the perimeter of the box is to be drawn
576 (in the same color as the label) after the label is drawn. The
577 value 2 implies that the box is to be filled (in the color
578 specified by 'LBC') before the label is drawn. The value 3
579 implies both of the above.
580 The default value of 'HLB' is 0.
582 'HLC' - High/Low Label Color Index - Integer
584 The parameter 'HLC' is used in determining the color index for
585 high and low labels.
586 The color index for high labels is determined in this manner: If
588 'HIC' is greater than or equal to zero, 'HIC' is used as the
589 color index. If 'HIC' is less than zero, but 'HLC' is greater
590 than or equal to zero, 'HLC' is used as the color index. If both
591 'HIC' and 'HLC' are less than zero, the current text color index
592 is used. If a box is drawn around the label, it is made the same
593 color as the label itself.
594 The color index for low labels is determined similarly: If 'LOC'
596 is greater than or equal to zero, 'LOC' is used as the color
597 index. If 'LOC' is less than zero, but 'HLC' is greater than or
598 equal to zero, 'HLC' is used as the color index. If both 'LOC'
599 and 'HLC' are less than zero, the current text color index is
600 used. If a box is drawn around the label, it is made the same
601 color as the label itself.
602 To set the color index of all high and low labels, simply supply
604 the desired value for 'HLC'. To have highs and low labels which
605 are colored differently, set 'HIC' and 'LOC'.
606 The default values of 'HLC', 'HIC', and 'LOC' are all -1's.
608 'HLE' - High/Low Equal-Value Search - Integer
610 If 'HLE' has the value zero, only the "normal" search for highs
611 and lows, as described in the programmer document for CONPACK
612 (in the section "Searching for Highs and Lows") is performed.
613 If 'HLE' has the value one, and if the "normal" search for highs
615 and lows sees evidence that an additional search should be
616 performed, then the additional search is performed. See the
617 section "Extended High/Low Search Algorithm", in the programmer
618 document for CONPACK.
619 If 'HLE' has the value two or greater, and if the "normal"
621 search for highs and lows sees evidence that an additional
622 search should be performed, then the additional search is
623 performed, but the candidate regions considered are limited to
624 those containing no more than 'HLE' grid points.
625 Whenever 'HLE' is given a non-zero value, care should be taken
627 to provide enough space in the integer work array to hold an
628 additional M*N elements, where M and N are the dimensions of the
629 array being contoured. This space will be needed during a call
630 to CPHLLB.
631 The default value of 'HLE' is zero.
633 'HLL' - High/Low Line Width - Real
635 If 'HLL' has a value less than or equal to zero, line width will
636 not be set before drawing boxes around high and low labels. If
637 'HLL' has a value greater than zero, it specifies the desired
638 width, as a multiple of the "normal" line width.
639 The default value of 'HLL' is 0.
641 'HLO' - High/Low Label Overlap Flag - Integer
643 The value of 'HLO' says what is to be done about the problem of
644 high and low labels overlapping other objects. The value 0
645 implies that the problem will be ignored; high and low labels
646 will not be checked for overlap with anything else. Adding 1 to
647 the value of 'HLO' implies the omission of high and low labels
648 which overlap the informational label. Adding 2 implies the
649 omission of high and low labels which overlap other high and low
650 labels found before it. Adding 4 implies the omission of high
651 and low labels which overlap the edges of the viewport, while
652 adding 8 implies that high and low labels which overlap the
653 edges of the viewport should be moved inward by just enough to
654 take care of the problem. If you add both 4 and 8, the effect
655 will be as if you had added 4 alone.
656 The default value of 'HLO' is 3 (1 + 2).
658 'HLS' - High/Low Label Size - Real
660 The parameter 'HLS' specifies the nominal size (width) of a
661 character in a high or low label, as a fraction of the width of
662 the viewport. This nominal size is multiplied by 'CWM'.
663 The default value of 'HLS' is .012.
665 'HLT' - High/Low Label Text Strings - Character
667 The character strings used to label highs and lows may be
668 specified individually, by setting 'HIT' and 'LOT', or together,
669 by setting 'HLT'. If 'HLT' is set, and there are no apostrophes
670 in the given character string, both 'HIT' and 'LOT' will be set
671 equal to it and it will therefore be used as the label for both
672 highs and lows. If there are apostrophes in the string, what
673 precedes the first one will be used as the value of 'HIT' (the
674 label for a high) and what follows it will be used as the value
675 of 'LOT' (the label for a low).
676 Remember that, in FORTRAN, an apostrophe in a string which is
678 delimited by apostrophes is represented by two apostrophes.
679 The substring $ZDV$ may be used to represent the numeric value
681 of the high or the low, divided by the current scale factor; the
682 substring $ZDVU$ may be used to represent the unscaled value.
683 Some examples:
685 FORTRAN STRING HIGH LABEL LOW LABEL
688 ------------------------ ------------- -------------
689 'H''L' H L
690 'HI''LO' HI LO
692 '$ZDV$' 1.362 0.764
694 'H($ZDV$)''L($ZDV$)' H(1.362) L(0.764)
696 'H:B:$ZDV$:E:''L:B:$ZDV$:E:' H L
698 1.362 0.764
699 Note that, in the final example, the subscripting capability of
701 the utility Plotchar is used. The terminating function code "E"
702 ensures that the "H" or the "L" will be centered on the high or
703 low; to center the whole thing, either remove the 'E's or change
704 them to 'N's.
705 Neither of the character strings 'HIT' and 'LOT' may contain
707 more than 20 characters.
708 If 'HIT' is blank, highs will not be labeled. If 'LOT' is blank,
710 lows will not be labeled.
711 The default value for 'HIT' is 'H:B:$ZDV$:E:' and the default
713 value of 'LOT' is 'H:B:$ZDV$:E:', as shown in the final example
714 above.
715 'HLW' - High/Low Label White Space Width - Real
717 The parameter 'HLW' specifies the nominal width of white space
718 to be left around a high or low label, as a fraction of the
719 width of the viewport. This nominal width is multiplied by
720 'CWM'.
721 The default value of 'HLW' is 0.005.
723 'HLX' - High/Low Search Radius in X - Integer
725 If 'HLX' is greater than zero, it specifies the half-width of
726 the index-value neighborhood used in searching the contour field
727 for highs and lows. If 'HLX' is less than or equal to zero,
728 Conpack picks a reasonable value to use (approximately 1/8 of
729 'ZDM', but not less than 2 nor greater than 15).
730 As an example, if 'HLX' = 3 and 'HLY' = 4, then the values in
732 ZDAT examined to determine if (I,J) is a high or a low are those
733 having indices (K,L), where either K is not equal to I or L is
734 not equal to J, K is between MAX(1,I-3) and MIN('ZDM',I+3),
735 inclusive, and L is between MAX(1,J-4) and MIN('ZDN',J+4),
736 inclusive.
737 The default value of 'HLX' is 0.
739 'HLY' - High/Low Search Radius in Y - Integer
741 If 'HLY' is greater than zero, it specifies the half-height of
742 the index-value neighborhood used in searching the contour field
743 for highs and lows. If 'HLY' is less than or equal to zero,
744 Conpack picks a reasonable value to use (approximately 1/8 of
745 'ZDN', but not less than 2 nor greater than 15).
746 For an example, see the description of 'HLX', above.
748 The default value of 'HLY' is 0.
750 'ILA' - Informational Label Angle - Real
752 The parameter 'ILA' specifies the angle (in degrees
753 counterclockwise from a vector pointing to the right) at which
754 the informational label is to be written.
755 The default value of 'ILA' is 0.
757 'ILB' - Informational Label Box Flag - Integer
760 If 'ILB' is zero, the informational label will not be boxed at
761 all. The value 1 implies that the perimeter of the box is to be
762 drawn (in the same color as the label) after the label is drawn.
763 The value 2 implies that the box is to be filled (in the color
764 specified by 'LBC') before the label is drawn. The value 3
765 implies both of the above.
766 The default value of 'ILB' is 0.
768 'ILC' - Informational Label Color Index - Integer
771 If 'ILC' is less than zero, the informational label and the box,
773 if any, around it, will be drawn in the color specified by the
774 current text color index; if 'ILC' is greater than or equal to
775 zero, then it specifies the desired color index for the label
776 and the box. If a box is drawn around the label, it is made the
777 same color as the label itself.
778 The default value of 'ILC' is -1.
780 'ILL' - Informational Label Line Width - Real
783 If 'ILL' has a value less than or equal to zero, line width will
784 not be set before drawing a box around the informational label.
785 If 'ILL' has a value greater than zero, it specifies the desired
786 width, as a multiple of the "normal" line width.
787 The default value of 'ILL' is 0.
789 'ILP' - Informational Label Positioning Flag - Integer
791 The parameter 'ILP' says how the informational label is to be
792 positioned. There are nine possible values, each of which
793 specifies a point of the label box which is to lie on the point
794 defined by 'ILX' and 'ILY': the value -4 implies the lower left-
795 hand corner of the label box, -3 implies the center of the
796 bottom of the box, -2 the lower right-hand corner of the box, -1
797 the center of the left edge of the box, 0 the center of the box,
798 +1 the center of the right edge of the box, +2 the upper left-
799 hand corner of the box, +3 the center of the top edge of the
800 box, and +4 the upper right-hand corner of the box. Left, right,
801 bottom, and top are defined from the viewpoint of someone
802 reading the label right-side up.
803 The default value of 'ILP' is 4, so the upper right-hand corner
805 of the box will be placed on the point ('ILX','ILY').
806 'ILS' - Informational Label Size - Real
809 The parameter 'ILS' specifies the nominal size (width) of a
810 character in the informational label, as a fraction of the width
811 of the viewport. This nominal size is multiplied by 'CWM'.
812 The default value of 'ILS' is 0.012.
814 'ILT' - Informational Label Text String - Character
816 The parameter 'ILT' is a string of 100 or fewer characters,
817 specifying the text of the informational label. The following
818 substrings will be replaced by a numeric value:
819 $CIU$ - THE CONTOUR INTERVAL USED.
821 $CMN$ - THE MINIMUM CONTOUR LEVEL.
822 $CMX$ - THE MAXIMUM CONTOUR LEVEL.
823 $SFU$ - THE CURRENT SCALE FACTOR.
824 $ZMN$ - THE MINIMUM VALUE IN THE DATA ARRAY.
825 $ZMX$ - THE MAXIMUM VALUE IN THE DATA ARRAY.
826 In each case except $SFU$, the given value will have been
828 divided by the current scale factor. A "U" may be inserted just
829 before the final "$" (as in '$CIUU$', '$CMNU$', etc.) to
830 request the use of an unscaled value.
831 The value with which $CIU$ is replaced will only be correct if
833 Conpack itself has chosen the contour levels; otherwise, it may
834 be necessary for the user to set the value of 'CIU' (which see,
835 above).
836 If 'ILT' is given the value ' ' (a single blank), there will be
838 no informational label.
839 The default value of 'ILT' is 'CONTOUR FROM $CMN$ TO $CMX$ BY
841 $CIU$'.
842 'ILW' - Informational Label White Space Width - Real
844 The parameter 'ILW' specifies the nominal width of white space
845 to be left around the informational label, as a fraction of the
846 width of the viewport. This nominal width is multiplied by
847 'CWM'.
848 The default value of 'ILW' is 0.005.
850 'ILX' - Informational Label X Coordinate - Real
852 The parameter 'ILX' specifies the X coordinate of the basepoint
853 of the informational label. The given value is mapped linearly
854 onto the viewport; 0 refers to the left edge of the viewport and
855 1 to the right edge of the viewport. Values less than 0 or
856 greater than 1 may be used.
857 The default value of 'ILX' is 0.98.
859 'ILY' - Informational Label Y Coordinate - Real
861 The parameter 'ILY' specifies the Y coordinate of the basepoint
862 of the informational label. The given value is mapped linearly
863 onto the viewport; 0 refers to the bottom edge of the viewport
864 and 1 to the top edge of the viewport. Values less than 0 or
865 greater than 1 may be used.
866 The default value of 'ILY' is -.02.
868 'IWM' - Integer Workspace for Masking - Integer
870 The parameter 'IWM' specifies the amount of integer workspace to
871 be allotted for use by CPCLDM, which draws contour lines masked
872 by an area map, in calls to the routine ARDRLN, in the package
873 Areas. Assume a parameter value "n"; the space used will be "2n"
874 ("n" for the array IAI and "n" for the array IAG, in calls to
875 ARDRLN). The value "n" must be greater than or equal to the
876 number of group identifiers used in generating the area map.
877 The default value of 'IWM' is 10.
879 'IWU' - Integer Workspace Usage - Integer
881 The parameter 'IWU' is intended for retrieval only. It is zeroed
882 by the call to CPRECT, CPSPS1, or CPSPS2. Therefore, by
883 retrieving its value after an entire plot has been constructed,
884 one may find out how large an integer workspace was actually
885 required.
886 'LBC' - Label Box Color Index - Integer
888 If label boxes (of whatever type) are filled, the filling is
889 done using the color index specified by 'LBC'. If 'LBC' is less
890 than zero, the current fill area color index is used.
891 The default value of 'LBC' is 0, which specifies the background
893 color.
894 'LBX' - Label Box X Coordinate - Real
896 Not to be set by the user. The value may be retrieved in one of
897 the routines CPCHCF, CPCHHL, CPCHIL, or CPCHLL. It specifies the
898 X coordinate (in the current user coordinate system) of the
899 center of the box surrounding the label that has caused the
900 routine to be called.
901 The default value of 'LBX' is 0.
903 'LBY' - Label Box Y Coordinate - Real
905 Not to be set by the user. The value may be retrieved in one of
906 the routines CPCHCF, CPCHHL, CPCHIL, or CPCHLL. It specifies the
907 Y coordinate (in the current user coordinate system) of the
908 center of the box surrounding the label that has caused the
909 routine to be called.
910 The default value of 'LBY' is 0.
912 'LIS' - Label Interval Specifier - Integer
914 When 'CLS' is given a positive value, indicating that Conpack is
915 to choose contour levels at intervals of the form "bk", where
916 "b" is a base value and "k" is an integer, and 'CIS' is given a
917 positive value, indicating that it is the desired value of "b",
918 then 'LIS' must be set to specify the interval between labeled
919 contour levels.
920 See the descriptions of the parameters 'CLS' and 'CIS'.
922 As an example, one might specify 'CLS'=1, 'CIS'=1/3 and 'LIS'=3
924 in order to get contours at values like 1/3, 2/3, 3/ 3, 4/3,
925 etc., with labels at values like 1, 2, 3, etc.
926 The default value of 'LIS' is 5.
928 'LIT' - Label Interval Table - Integer Array
930 See the description of the parameter 'CIT'.
931 'LIU' - Label Interval Used - Integer
933 The parameter 'LIU' is for retrieval only. When Conpack chooses
934 the contour interval and decides that every "nth" one should be
935 labeled, it sets 'LIU' to "n".
936 'LLA' - Line Label Angle - Real
938 The parameter 'LLA' specifies the angle (in degrees
939 counterclockwise from a vector pointing to the right) at which
940 contour line labels are to be written when ABS('LLP') is greater
941 than or equal to 2 and 'LLO' is 0.
942 The default value of 'LLA' is 0.
944 'LLB' - Line Label Box Flag - Integer
946 If 'LLB' is zero, contour line labels drawn by CPLBDR will not
947 be boxed at all. The value 1 implies that the perimeter of the
948 box is to be drawn (in the same color as the label) after the
949 label is drawn. The value 2 implies that the box is to be filled
950 (in the color specified by 'LBC') before the label is drawn. The
951 value 3 implies both of the above.
952 The default value of 'LLB' is 0.
954 'LLC' - Line Label Color Index - Integer Array
956 Each element of the parameter array 'LLC', if greater than or
957 equal to zero, is the color index for labels on contour lines at
958 the level specified by the associated element of 'CLV'. A value
959 less than zero implies that the current text color index is to
960 be used.
961 This parameter only affects line labels when ABS('LLP') = 2 or 3
963 and the labels are therefore drawn by CPLBDR. It does not affect
964 line labels when ABS('LLP') = 1 and the line labels are
965 therefore drawn by the dash package, as called by CPCLDM or
966 CPCLDR.
967 The default values of the elements of 'LLC' are all -1's.
969 'LLL' - Line Label Line Width - Real
971 If 'LLL' has a value less than or equal to zero, line width will
972 not be set before drawing boxes around contour line labels. If
973 'LLL' has a value greater than zero, it specifies the desired
974 width, as a multiple of the "normal" line width.
975 The default value of 'LLL' is 0.
977 'LLO' - Line Label Orientation - Integer
979 The parameter 'LLO' only has effect when ABS('LLP') is greater
980 than or equal to 2, specifying use of either the regular scheme
981 or the penalty scheme for positioning labels on contour lines.
982 If 'LLO' is zero, the labels are written at the angle specified
983 by 'LLA'. If 'LLO' is non-zero, the labels are written in the
984 local direction of the contour line.
985 The default value of 'LLO' is 0.
987 'LLP' - Line Label Positioning - Integer
989 The parameter 'LLP' says whether or not labels should be
990 produced and, if so, how, as follows:
991 · If 'LLP' is 0, it says that no line labels should be
993 produced.
994 · If ABS('LLP') is 1, it says that labels should be
996 positioned along contour lines by using the old
997 Conrec_family scheme of setting up a character dash
998 pattern including the label and using the software dash
999 package to draw the labels (which requires having 'DPU'
1000 set non-zero). This scheme has the disadvantages that one
1001 cannot control the orientation and one cannot shield the
1002 labels from having contour lines drawn through them.
1003 · If ABS('LLP') is 2, it says that labels should be
1005 positioned at regular intervals along the line. See the
1006 descriptions of the parameters 'RC1', 'RC2', and 'RC3'.
1007 · If ABS('LLP') is 3, it says that labels should be
1009 positioned using a penalty scheme, which gives much
1010 better results than either of the others.
1011 When 'LLP' is 2 or 3, the 2D smoothing, if any, implied by the
1013 value of 'T2D' is suspended during label positioning, so that
1014 fewer label positions will be considered; this is quite a bit
1015 faster and the results are nearly as good as if the smoothing
1016 were done. To force smoothing, use 'LLP' = -2 or -3.
1017 The default value of 'LLP' is 1.
1019 'LLS' - Line Label Size - Real
1021 The parameter 'LLS' specifies the nominal size (width) of a
1022 character in a contour line label, as a fraction of the width of
1023 the viewport. This nominal size is multiplied by 'CWM'.
1024 The default value of 'LLS' is 0.010.
1026 'LLT' - Line Label Text String - Character
1028 For each I from 1 to 'NCL', element I of the parameter array
1029 'LLT' is a string of twenty or fewer characters, to be used as a
1030 label for the contour level specified by the Ith element of
1031 'CLV'. Since the character string will be plotted using the
1032 routine PLCHHQ, in the package Plotchar, it may contain colon-
1033 enclosed "function codes" to do things like create superscripts.
1034 If the elements of this array are not supplied by the user, they
1036 will be filled in by Conpack itself.
1037 'LLW' - Line Label White Space - Real
1039 The parameter 'LLW' specifies the nominal width of white space
1040 to be left around a contour line label, as a fraction of the
1041 width of the viewport. This nominal width is multiplied by
1042 'CWM'.
1043 The default value of 'LLW' is 0.005.
1045 'LOC' - Low Label Color Index - Integer
1047 The parameter 'LOC' is used in determining the color index for
1048 low labels. See the description of 'HLC', above.
1049 'LOT' - Low Label Text String - Character
1051 The parameter 'LOT' specifies the text string to be used in
1052 labeling a low. See 'HLT', above.
1053 'MAP' - Mapping Flag - Integer
1055 If 'MAP' is zero, it says that the x and y coordinates used to
1056 create the contour map are not to be transformed by the user-
1057 replaceable subroutine CPMPXY. If 'MAP' is non-zero, it says
1058 that x and y coordinates are to be so transformed. The default
1059 version of CPMPXY provides two useful mappings:
1060 If the first subscript of the data array is a linear function of
1062 the longitude and the second is a linear function of the
1063 latitude, then one can transform all graphics output onto a map
1064 background created by calls to routines in the utility package
1065 Ezmap just by setting 'MAP' = 1, 'XC1' = minimum longitude,
1066 'XCM' = maximum longitude, 'YC1' = minimum latitude, and 'YCN' =
1067 maximum latitude. Also, the parameter 'SET' must be given the
1068 value 0 in order to prevent Conpack from calling SET and thereby
1069 overriding the call done by Ezmap.
1070 If the first subscript of the data array is a linear function of
1072 rho and the second is a linear function of theta, where rho and
1073 theta are polar coordinates, then to map all graphics output
1074 properly, one may set 'MAP' = 2, 'XC1' = minimum rho, 'XCM' =
1075 maximum rho, 'YC1' = minimum theta, and 'YCN' = maximum theta.
1076 In this case, one must either use 'SET' = 0 and do an
1077 appropriate SET call or use 'SET' = 1 and give the parameters
1078 'WDB', 'WDL', 'WDR', and 'WDT' values consistent with the mapped
1079 values of X and Y, which will all be of the form
1080 "rho*cos(theta)" and "rho*sin(theta)", respectively.
1081 Using any other non-zero value of 'MAP' will result in the
1083 identity mapping.
1084 Of course, one can replace the routine CPMPXY and build as many
1086 different mappings into it as desired. See the description of
1087 CPMPXY.
1088 'NCL' - Number of Contour Levels - Integer
1090 If Conpack is to pick contour levels (see the description of the
1091 parameter 'CLS') then the initial call to CPRECT, CPSPS1, or
1092 CPSPS2 causes 'NCL' to be zeroed. Subsequently, during the first
1093 call to a Conpack routine requiring contour levels to have been
1094 chosen, 'NCL' will be set as part of the process of choosing
1095 them. If the user elects to choose the contour levels, the first
1096 parameter which must be set to do this is 'NCL'.
1097 The parameter 'NCL' has no meaningful default value.
1099 'NEL' - Numeric Exponent Length - Integer
1101 Giving 'NEL' a value less than or equal to zero says that
1102 exponents in numeric labels should be written in the shortest
1103 possible form; plus signs are omitted and the exponent magnitude
1104 is written with no leading zeroes. A value "n" which is greater
1105 than zero indicates that all exponents should be written with a
1106 sign (+ or -) and that the exponent magnitude should be padded
1107 with leading zeroes to a length of n characters.
1108 The default value of 'NEL' is 0.
1110 'NET' - Numeric Exponent Type - Integer
1112 The parameter 'NET' says what characters are to be used between
1113 the mantissa of a numeric label and the exponent. The value 0
1114 implies the use of an E, as in FORTRAN "E format", the value 1
1115 implies the use of function codes, as expected by the utility
1116 Plotchar, to generate "x 10**n", where n is a superscript
1117 exponent, and the value 2 implies the use of "x10**".
1118 The default value of 'NET' is 1.
1120 'NEU' - Numeric Exponent Use Flag - Integer
1122 Giving 'NEU' a value less than or equal to zero forces the use
1123 of the exponential form in all numeric labels. A positive value
1124 "n" indicates that the form without an exponent should be used
1125 as long as it requires no more than n characters; otherwise the
1126 form requiring the fewest characters should be used.
1127 The default value of 'NEU' is 5.
1129 'NLS' - Numeric Leftmost Significant Digit Flag - Integer
1131 Giving 'NLS' the value zero says that the leftmost non-zero
1132 digit of a number represented by a numeric label is to be
1133 considered its first significant digit. A non-zero value says
1134 that the digit in the same digit position as the leftmost non-
1135 zero digit of the largest number (in absolute value) in the data
1136 field being contoured is to be considered the leftmost
1137 significant digit. This tends to make the numeric labels more
1138 nearly consistent with one another. Consider the following
1139 example, using three significant digits:
1140 USING 'NLS'=0: .500 1.00 1.50 ... 9.50 10.5 ...
1142 USING 'NLS'=1: .5 1.0 1.5 ... 9.5 10.5 ...
1143 The default value of 'NLS' is 1.
1145 'NLZ' - Numeric Leading Zero Flag - Integer
1147 Giving 'NLZ' a non-zero value says that a zero is to placed
1148 before any numeric label which would otherwise begin with a
1149 decimal point (use "0.345", rather than ".345").
1150 The default value of 'NLZ' is 0.
1152 'NOF' - Numeric Omission Flags - Integer
1154 The parameter 'NOF' says what parts of a numeric label may be
1155 omitted. The value 0 says that no part may be omitted. Add a 4
1156 to indicate that a leading "1" or "1." which is unnecessary (as
1157 in "1 x 10**13") may be omitted, a 2 to indicate that a trailing
1158 decimal point (as in "13.") may be omitted, and a 1 to indicate
1159 that trailing zeroes (as in "46.200") may be omitted.
1160 Contour line labels generated by Conpack and values in the
1162 informational label which are known to have been rounded to
1163 "nice" values (like '$CIU$', '$CMN$', and '$CMX$') will have
1164 trailing zeroes trimmed in any case, no matter what the value of
1165 'NOF' is.
1166 The default value of 'NOF' is 6 (4 + 2).
1168 'NSD' - Number of Significant Digits - Integer
1170 The parameter 'NSD' specifies the maximum number of significant
1171 digits to be used in numeric labels representing contour field
1172 values. A negative value "-n" indicates that n significant
1173 digits should be used. A positive value "n" indicates that "m+n"
1174 digits should be used, where "m" is the number of digits that
1175 are the same for all values in the contour field. (For example,
1176 if the minimum value is "1123.6" and the maximum value is
1177 "1125.9", then the value of "m" is 3.)
1178 The default value of 'NSD' is 4.
1180 'NVS' - Number of Vertical Strips - Integer
1182 When the parameter 'NVS' is non-zero, an extra group of edges,
1183 with group identifier 'GIS', is added to the area map by the
1184 routine CPCLAM. These edges include the boundary of the viewport
1185 and enough vertical lines to break the area occupied by the
1186 viewport up into 'NVS' vertical strips. The object of this is to
1187 break up the contour bands which are to be filled into smaller
1188 and simpler pieces; this may be necessary if the graphics device
1189 in use limits the number of points which may be used to define a
1190 polygon to be filled. The area identifier for the outside of the
1191 viewport is -1; all other area identifiers used are 0's.
1192 The default value of 'NVS' is 1.
1194 'ORV' - Out-of-Range Value - Real
1196 If 'ORV' is non-zero, it specifies an out-of-range value, to be
1197 used as the value of X and Y coordinates returned by the mapping
1198 routine CPMPXY to say that a point is out-of-range (invisible)
1199 under the current mapping.
1200 The default value of 'ORV' is 0.
1202 'PAI' - Parameter Array Index - Integer
1204 The value of 'PAI' must be set before calling CPGETC, CPGETI,
1205 CPGETR, CPSETC, CPSETI, or CPSETR to access any parameter which
1206 is an array; it indicates which element of the array is meant.
1207 For example, to set the 10th contour level to zero, use code
1208 like this:
1209 CALL CPSETI ('PAI - PARAMETER ARRAY INDEX',10)
1211 CALL CPSETR ('CLV - CONTOUR LEVEL',0.)
1212 The default value of 'PAI' is 0.
1214 'PC1' - Penalty Scheme Constant 1 - Real
1216 The parameter 'PC1' is one of the constants used in the penalty
1217 scheme for positioning labels. The largest gradient allowed at
1218 the position of a label will be GRAV + 'PC1' * GRSD, where GRAV
1219 is the average gradient and GRSD is the standard deviation of
1220 the gradients.
1221 The default value of 'PC1' is 1.
1223 'PC2' - Penalty Scheme Constant 2 - Real
1225 The parameter 'PC2' is one of the constants used in the penalty
1226 scheme for positioning labels. It specifies the maximum
1227 (estimated) number of contour bands allowed to cross a label.
1228 The default value of 'PC2' is 5.
1230 'PC3' - Penalty Scheme Constant 3 - Real
1232 The parameter 'PC3' is one of the constants used in the penalty
1233 scheme for positioning labels. It specifies, in degrees, the
1234 maximum cumulative change in direction to be allowed along that
1235 portion of the contour line covered by a circle centered on a
1236 label and having a radius equal to half the width of the label.
1237 The default value of 'PC3' is 60.
1239 'PC4' - Penalty Scheme Constant 4 - Real
1241 The parameter 'PC4' is one of the constants used in the penalty
1242 scheme for positioning labels. It specifies the "optimal
1243 distance" in the term in the penalty function which attempts to
1244 force labels to be at an optimal distance from each other.
1245 The default value of 'PC4' is 0.05.
1247 'PC5' - Penalty Scheme Constant 5 - Real
1249 The parameter 'PC5' is one of the constants used in the penalty
1250 scheme for positioning labels. It specifies the "folding
1251 distance" in the term in the penalty function which attempts to
1252 force labels to be at an optimal distance from each other.
1253 The default value of 'PC5' is 0.15.
1255 'PC6' - Penalty Scheme Constant 6 - Real
1257 The parameter 'PC6' is one of the constants used in the penalty
1258 scheme for positioning labels. It specifies the minimum distance
1259 to be allowed between any two labels on the same contour line,
1260 as a fraction of the width of the viewport.
1261 The default value of 'PC6' is 0.30.
1263 'PIC' - Point Interpolation Flag for Contours - Integer
1265 The parameter 'PIC' specifies the number of points to
1266 interpolate between each pair of points defining a segment of a
1267 contour line, prior to any mapping implied by the parameter
1268 'MAP'. It is intended that a non-zero value should normally be
1269 used only if 'MAP' is non-zero, which turns mapping on, and
1270 'T2D' is zero, which turns the 2D smoother off; the intent is to
1271 map straight-line segments of contour lines more nearly
1272 correctly into curved-line segments on a background (one drawn
1273 by Ezmap, for example). If the 2D smoother is turned on, the
1274 additional points will be used and the smoothed curve will be
1275 constrained to pass through them; this may be useful.
1276 A negative value of 'PIC' causes ABS('PIC') points to be
1278 interpolated, but the interpolated points are not, in general,
1279 used to draw the line segment; the object, in this case, is
1280 simply to do a finer search for changes in visibility (out-of-
1281 range state, as defined by values of 'ORV' returned by the
1282 routine CPMPXY) along the segment.
1283 The default value of 'PIC' is 0.
1285 'PIE' - Point Interpolation Flag for Edges - Integer
1287 The parameter 'PIE' specifies the number of points to
1288 interpolate between each pair of points defining a segment of an
1289 "edge" (the edge of the grid, the edge of a special-value area,
1290 or the edge of an out-of-range area). It is intended that a non-
1291 zero value should normally be used only if 'MAP' is non-zero,
1292 which turns mapping on; the intent is to map straight-line
1293 segments of edge lines more nearly correctly into curved-line
1294 segments on a background (one drawn by Ezmap, for example).
1295 A negative value of 'PIE' causes ABS('PIE') points to be
1297 interpolated, but the interpolated points are not, in general,
1298 used to draw the line segment; the object, in this case, is
1299 simply to do a finer search for changes in out-of-range state
1300 (visibility) along the segment. (The edges of out-of-range
1301 areas, however, are drawn using all such interpolated points.)
1302 Using too large an (absolute) value of 'PIE' will cause the
1304 tracing of the edges of out-of-range areas to be very time-
1305 consuming, because the number of points to be examined is 'ZDM'
1306 x 'ZDN' x 'PIE' x 'PIE'.
1307 The default value of 'PIE' is 0.
1309 'PW1' - Penalty Scheme Weight 1 - Real
1311 The parameter 'PW1' specifies the weight for the gradient term
1312 in the penalty function.
1313 The default value of 'PW1' is 2.
1315 'PW2' - Penalty Scheme Weight 2 - Real
1317 The parameter 'PW2' specifies the weight for the number-of-
1318 contours term in the penalty function.
1319 The default value of 'PW2' is 0.
1321 'PW3' - Penalty Scheme Weight 3 - Real
1323 The parameter 'PW3' specifies the weight for the change-in-
1324 direction term in the penalty function.
1325 The default value of 'PW3' is 1.
1327 'PW4' - Penalty Scheme Weight 4 - Real
1329 The parameter 'PW4' specifies the weight for the optimum-
1330 distance term in the penalty function.
1331 The default value of 'PW4' is 1.
1333 'RC1' - Regular Scheme Constant 1 - Real
1335 The parameter 'RC1' specifies the desired distance from the
1336 beginning of a contour line to the first label on that line when
1337 they are positioned using the "regular" scheme. The nth label on
1338 each labeled contour line will be at a distance 'RC1' + 'RC2' x
1339 (n-1) + 'RC3' x Rn units (in the fractional coordinate system)
1340 from the beginning of the line, where "Rn" is a random number
1341 between -1 and 1.
1342 The default value of 'RC1' is 0.25.
1344 'RC2' - Regular Scheme Constant 2 - Real
1346 The parameter 'RC2' specifies the desired nominal distance
1347 between labels when they are positioned using the "regular"
1348 scheme. See the description of 'RC1', above.
1349 The default value of 'RC2' is 0.25.
1351 'RC3' - Regular Scheme Constant 3 - Real
1353 The parameter 'RC3' specifies the desired maximum variation in
1354 the distance between labels when they are positioned using the
1355 regular scheme. See the description of 'RC1', above.
1356 The default value of 'RC3' is 0.05.
1358 'RWC' - Real Workspace for Contours - Integer
1360 The parameter 'RWC' specifies the amount of real workspace to be
1361 allotted to hold X coordinates of points defining contour lines.
1362 Assume a parameter value "n". If no 2D smoothing is requested,
1363 the total space used will be "2n" ("n" for X coordinates and
1364 another "n" for Y coordinates). If 2D smoothing is requested,
1365 the total space used will be "7n" ("n" for X coordinates, "n"
1366 for Y coordinates, and "5n" for scratch arrays).
1367 Normally, the value of 'RWC' is of no particular interest to the
1369 user, since the same contour lines are produced with a small
1370 value as would be produced with a larger value. There are two
1371 situations in which it becomes of more interest: 1) When the
1372 penalty scheme is used to position labels, the length of the
1373 portion of the contour line over which the penalty function is
1374 evaluated is limited by the value of 'RWC'. If 'RWC' is set too
1375 small, too many labels may be put on a given contour line and
1376 some of them may be too close to each other. 2) When hachuring
1377 has been activated (by setting the value of 'HCF' non-zero), it
1378 is important that the internal routine that does the hachuring
1379 see entire contours at once, so that it may properly decide
1380 whether a contour is open or closed and, in the latter case,
1381 where the interior of the closed contour is. In both of these
1382 cases, the solution is to increase the value of 'RWC'.
1383 The default value of 'RWC' is 100.
1385 'RWG' - Real Workspace for Gradients - Integer
1387 The parameter 'RWG' specifies the amount of real workspace to be
1388 allotted to hold gradients which are to be computed and used in
1389 positioning labels using the penalty scheme. Using a larger
1390 value provides for a more accurate representation of the
1391 gradient field, up to the point at which it exceeds 'ZDM' x
1392 'ZDN'.
1393 The default value of 'RWG' is 1000.
1395 'RWM' - Real Workspace for Masking - Integer
1397 The parameter 'RWM' specifies the amount of real workspace to be
1398 allotted for use by CPCLDM, which draws contour lines masked by
1399 an area map, in calls to the routine ARDRLN, in the package
1400 Areas. Assume a parameter value "n"; the space used will be "2n"
1401 ("n" for the X-coordinate array XCS and "n" for the Y-coordinate
1402 array YCS, in calls to ARDRLN). Any value of "n" greater than
1403 or equal to 2 will work; smaller values will cause the
1404 generation of more calls to the user routine RTPL (one of the
1405 arguments of CPCLDM).
1406 The default value of 'RWM' is 100.
1408 'RWU' - Real Workspace Usage - Integer
1410 The parameter 'RWU' is intended for retrieval only. It is zeroed
1411 by the call to CPRECT, CPSPS1, or CPSPS2. Thereafter, as
1412 Conpack routines are called, the value of 'RWU' is updated to
1413 reflect the largest number of words of real workspace needed at
1414 any one time. Therefore, by retrieving its value after an entire
1415 plot has been constructed, one may find out how large a real
1416 workspace was actually required.
1417 'SET' - Do-SET-Call Flag - Integer
1419 Giving 'SET' the value 0 says that no SET call is to be done by
1420 Conpack; the value 1 says that it is to be done. In the latter
1421 case, the call is done by CPRECT, CPSPS1, or CPSPS2.
1422 Arguments 5-8 of a SET call done by the user must be consistent
1424 with the ranges of the X and Y coordinates being used by
1425 Conpack, as specified by the values of the parameters 'XC1',
1426 'XCM', 'YC1', 'YCN', and 'MAP'. See the descriptions of those
1427 parameters.
1428 The default value of 'SET' is 1.
1430 'SFS' - Scale Factor Selector - Real
1432 The scale factor is that value (usually, but not necessarily, a
1433 power of 10) by which the actual values of contour field values
1434 are to be divided to get the value of a numeric label. If 'SFS'
1435 is given a value greater than zero, that value is the scale
1436 factor to be used. If 'SFS' is given a value less than or equal
1437 to zero, it is truncated to form an integer directing Conpack to
1438 select a scale factor, as follows:
1439 0 Implies that the scale factor should be selected in such
1441 a way as to reduce the ZDAT element having the largest
1442 absolute value to the range from 0.1 to 0.999...
1443 -1 Implies that the scale factor should be selected in such
1445 a way as to reduce the ZDAT element having the largest
1446 absolute value to the range from 1. to 9.999...
1447 -2 Implies that the scale factor should be selected in such
1449 a way as to place the decimal point in the ZDAT element
1450 having the largest absolute value after the rightmost
1451 significant digit of that value (as defined by the values
1452 of 'NSD' and 'NLS').
1453 -3 Implies that the scale factor should be selected in such
1455 a way as to remove extra zeroes from the ends of the ZDAT
1456 element having the largest absolute value. For example,
1457 if that element were 0.000136, the scale factor would be
1458 10 to the power -3; if that element were 136000 (assuming
1459 three significant digits are desired), the scale factor
1460 would be 10 to the power 3. If there are no extra zeroes
1461 on either end of the ZDAT element having the largest
1462 absolute value, the scale factor will be 1.
1463 -4 or less
1465 Implies that the scale factor should be selected in such
1466 a way as to reduce all contour labels to integers.
1467 The default value of 'SFS' is 1.
1469 'SFU' - Scale Factor Used - Real
1471 The parameter 'SFU' is intended for retrieval only; it
1472 gives the value of the scale factor selected for use by
1473 Conpack.
1474 'SPV' - Special Value - Real
1476 If 'SPV' is non-zero, it specifies a "special value",
1477 which may be used in data fields to signal missing data.
1478 No contour lines will be drawn within any grid cell with
1479 a special value at one or more of its four corners.
1480 The default value of 'SPV' is 0.
1482 'SSL' - Smoothed Segment Length - Real
1484 The parameter 'SSL' specifies the distance between points
1485 used to draw the curves generated by 2D smoothing; it is
1486 expressed as a fraction of the width of the window in the
1487 coordinate system in which the smoothing is being done.
1488 The default value of 'SSL' is 0.01.
1490 'T2D' - Tension on 2-Dimensional Splines - Real
1492 A non-zero value of 'T2D' says that 2D smoothing (using
1493 cubic splines under tension) should be done; the absolute
1494 value of 'T2D' is the desired tension. If 'T2D' is
1495 negative, smoothing will be done before the mapping, if
1496 any, requested by the flag 'MAP'; if 'T2D' is positive,
1497 smoothing will be done after the mapping.
1498 The default value of 'T2D' is 0.
1500 'T3D' - Tension on 3-Dimensional Splines - Real
1502 The parameter 'T3D' specifies the tension on the 3D
1503 (bicubic) splines used by CPSPS1 or CPSPS2 to smooth the
1504 data being contoured.
1505 The default value of 'T3D' is 1.
1507 'VPB' - Viewport Bottom - Real
1509 The parameter 'VPB' is only used when 'SET' is non-zero,
1510 saying that Conpack should do the call to SET; it
1511 specifies the position of the bottom edge of the area in
1512 which the viewport is to be placed, expressed as a
1513 fraction between 0 (the bottom edge of the plotter frame)
1514 and 1 (the top edge of the plotter frame). See also the
1515 description of 'VPS'.
1516 The default value of 'VPB' is 0.05.
1518 'VPL' - Viewport Left - Real
1520 The parameter 'VPL' is only used when 'SET' is non-zero,
1521 saying that Conpack should do the call to SET; it
1522 specifies the position of the left edge of the area in
1523 which the viewport is to be placed, expressed as a
1524 fraction between 0 (the left edge of the plotter frame)
1525 and 1 (the right edge of the plotter frame). See also the
1526 description of 'VPS'.
1527 The default value of 'VPL' is 0.05.
1529 'VPR' - Viewport Right - Real
1531 The parameter 'VPR' is only used when 'SET' is non-zero,
1532 saying that Conpack should do the call to SET; it
1533 specifies the position of the right edge of the area in
1534 which the viewport is to be placed, expressed as a
1535 fraction between 0 (the left edge of the plotter frame)
1536 and 1 (the right edge of the plotter frame). See also the
1537 description of 'VPS'.
1538 The default value of 'VPR' is 0.95.
1540 'VPS' - Viewport Shape - Real
1542 The parameter 'VPS' is only used when 'SET' is non-zero,
1543 saying that Conpack should do the call to SET; it
1544 specifies the desired viewport shape, as follows:
1545 · A negative value specifies the exact shape of the
1547 viewport; the absolute value is the ratio of the
1548 width of the viewport to its height.
1549 · The value 0 specifies a viewport completely
1551 filling the area specified by 'VPL', 'VPR', 'VPB',
1552 and 'VPT'.
1553 · A value "s" between 0 and 1 specifies a plot of
1555 the shape determined by the values of 'XC1',
1556 'XCM', 'YC1', and 'YCN', reverting to the shape
1557 specified by 'VPL', 'VPR', 'VPB', and 'VPT' if the
1558 ratio of the shorter side to the longer side would
1559 be less than "s".
1560 · A value "s" greater than or equal to 1 specifies a
1562 plot of the shape determined by the values of
1563 'XC1', 'XCM', YC1', and 'YCN', reverting to a
1564 square if the ratio of the longer side to the
1565 shorter side would be greater than "s".
1566 The viewport, whatever its final shape, is centered in,
1568 and made as large as possible in, the area specified by
1569 the parameters 'VPB', 'VPL', 'VPR', and 'VPT'.
1570 The default value of 'VPS' is 0.25.
1572 'VPT' - Viewport Top - Real
1574 The parameter 'VPT' is only used when 'SET' is non-zero,
1575 saying that Conpack should do the call to SET; it
1576 specifies the position of the top edge of the area in
1577 which the viewport is to be placed, expressed as a
1578 fraction between 0 (the bottom edge of the plotter frame)
1579 and 1 (the top edge of the plotter frame). See also the
1580 description of 'VPS'.
1581 The default value of 'VPT' is 0.95.
1583 'WDB' - Window Bottom - Real
1585 When Conpack does the call to 'SET', the parameter 'WDB'
1586 is used to determine argument number 7, the user Y
1587 coordinate at the bottom of the window. If 'WDB' is not
1588 equal to 'WDT', 'WDB' is used. If 'WDB' is equal to
1589 'WDT', but 'YC1' is not equal to 'YCN', then 'YC1' is
1590 used. Otherwise, the value 1 is used.
1591 The default value of 'WDB' is 0.
1593 'WDL' - Window Left - Real
1595 When Conpack does the call to 'SET', the parameter 'WDL'
1596 is used to determine argument number 5, the user X
1597 coordinate at the left edge of the window. If 'WDL' is
1598 not equal to 'WDR', 'WDL' is used. If 'WDL' is equal to
1599 'WDR', but 'XC1' is not equal to 'XCM', then 'XC1' is
1600 used. Otherwise, the value 1 is used.
1601 The default value of 'WDL' is 0.
1603 'WDR' - Window Right - Real
1605 When Conpack does the call to 'SET', the parameter 'WDR'
1606 is used to determine argument number 6, the user X
1607 coordinate at the right edge of the window. If 'WDR' is
1608 not equal to 'WDL', 'WDR' is used. If 'WDR' is equal to
1609 'WDL', but 'XCM' is not equal to 'XC1', then 'XCM' is
1610 used. Otherwise, the value REAL('ZDM') is used.
1611 The default value of 'WDR' is 0.
1613 'WDT' - Window Top - Real
1615 When Conpack does the call to 'SET', the parameter 'WDB'
1616 is used to determine argument number 8, the user Y
1617 coordinate at the top of the window. If 'WDT' is not
1618 equal to 'WDB', 'WDT' is used. If 'WDT' is equal to
1619 'WDB', but 'YCN' is not equal to 'YC1', then 'YCN' is
1620 used. Otherwise, the value REAL('ZDN') is used.
1621 The default value of 'WDT' is 0.
1623 'WSO' - Workspace Overflow Flag - Integer
1625 The parameter 'WSO' says what to do when a real or
1626 integer workspace overflow occurs, as follows:
1627 · The value 0 indicates that execution will
1629 terminate with a fatal-error call to SETER.
1630 · The value 1 indicates that an error message will
1632 be written to the error file, after which
1633 execution will continue.
1634 · The value 2 indicates that no error message will
1636 be written, and that execution will continue.
1637 When execution continues, the resulting plot will be
1639 incomplete. The values of 'IWU' and 'RWU' may be
1640 retrieved to find out how much workspace would have been
1641 used if the call on which the workspace overflow occurred
1642 had succeeded; note that, if these amounts are provided
1643 on a subsequent run, one is not assured that the
1644 workspace overflow will be averted.
1645 The default value of 'WSO' is 1.
1647 'XC1' - X Coordinate at Index 1 - Real
1649 The parameter 'XC1' specifies the X coordinate value
1650 which corresponds to a value of 1 for the first subscript
1651 of the data array, prior to any mapping implied by a non-
1652 zero value of 'MAP'. If 'XC1' is equal to 'XCM', 1 will
1653 be used.
1654 The default value of 'XC1' is 0.
1656 'XCM' - X Coordinate at Index M - Real
1658 The parameter 'XCM' specifies the X coordinate value
1659 which corresponds to a value of 'ZDM' for the first
1660 subscript of the data array, prior to any mapping implied
1661 by a non-zero value of 'MAP'. If 'XC1' is equal to 'XCM',
1662 REAL('ZDM') will be used.
1663 The default value of 'XCM' is 0.
1665 'YC1' - Y Coordinate at Index 1 - Real
1667 The parameter 'YC1' specifies the Y coordinate value
1668 which corresponds to a value of 1 for the second
1669 subscript of the data array, prior to any mapping implied
1670 by a non-zero value of 'MAP'. If 'YC1' is equal to 'YCM',
1671 1 will be used.
1672 The default value of 'YC1' is 0.
1674 'YCN' - Y Coordinate at Index N - Real
1676 The parameter 'YCN' specifies the Y coordinate value
1677 which corresponds to a value of 'ZDN' for the second
1678 subscript of the data array, prior to any mapping implied
1679 by a non-zero value of 'MAP'. If 'YC1' is equal to 'YCN',
1680 REAL('ZDN') will be used.
1681 The default value of 'YCN' is 0.
1683 'ZD1' - ZDAT 1st Dimension - Integer
1685 The parameter 'ZD1' specifies the first dimension of the
1686 array ZDAT, which contains the data to be contoured. If
1687 CPRECT is called, it sets 'ZD1' (the argument KZDT is the
1688 desired value). If CPSPS1 or CPSPS2 is called, it either
1689 picks a value of 'ZD1' (if 'ZDS' is non-zero) or expects
1690 the user to have done so (if 'ZDS' is zero).
1691 The default value of 'ZD1' is 1.
1693 'ZDM' - Z Data Array Dimension M - Integer
1695 The parameter 'ZDM' specifies the first dimension of the
1696 array of data to be contoured. Its value will be less
1697 than or equal to the value of 'ZD1'. If CPRECT is called,
1698 it sets 'ZDM' (the argument MZDT is the desired value).
1699 If CPSPS1 or CPSPS2 is called, it either picks a value of
1700 'ZDM' (if 'ZDS' is non-zero) or expects the user to have
1701 done so (if 'ZDS' is zero).
1702 The default value of 'ZDM' is 1.
1704 'ZDN' - Z Data Array Dimension N - Integer
1706 The parameter 'ZDN' specifies the second dimension of the
1707 array of data to be contoured. If CPRECT is called, it
1708 sets 'ZDN' (the argument NZDT is the desired value). If
1709 CPSPS1 or CPSPS2 is called, it either picks a value of
1710 'ZDN' (if 'ZDS' is non-zero) or expects the user to have
1711 done so (if 'ZDS' is zero).
1712 The default value of 'ZDN' is 1.
1714 'ZDS' - ZDAT Dimension Selector - Integer
1716 If 'ZDS' is non-zero, CPSPS1 or CPSPS2 will select values
1717 for 'ZD1', 'ZDM', and 'ZDN'; otherwise, they will be
1718 expected to have been set by the user. Note that, if the
1719 size of the dense array is not a product of the size of
1720 the sparse array and some perfect square, the aspect
1721 ratio of the dense grid may be slightly different from
1722 that of the sparse grid.
1723 The default value of 'ZDS' is 1.
1725 'ZDU' - Z Data Value, Unscaled - Real
1727 The parameter 'ZDU' is just like 'ZDV' (which see,
1728 below), but the value is unscaled.
1729 'ZDV' - Z Data Value - Real
1731 The parameter 'ZDV' is mostly for output. Its value may
1732 be retrieved in a user version of CPCHHL to retrieve the
1733 value of the high or low which is being labeled. If a
1734 character string representing the value is desired,
1735 CPGETC may be used to obtain it (as modified by the
1736 current scale factor); thus, to obtain the character
1737 representation of an arbitrary value in a form consistent
1738 with the other values on a contour plot, set 'ZDV' with a
1739 call to CPSETR and retrieve the value of 'ZDV' with a
1740 call to CPGETC; if an unscaled value is desired, use the
1741 parameter name 'ZDU' in the call to CPGETC.
1742 'ZMN' - Z Minimum Value - Real
1744 The minimum value in the field, as found by CPRECT,
1745 CPSPS1, or CPSPS2. For output only.
1746 'ZMX' - Z Maximum Value - Real
1748 The maximum value in the field, as found by CPRECT,
1749 CPSPS1, or CPSPS2. For output only.
1750
1752 Online: cpgetc, cpgeti, cpgetr, cprset, cpsetc, cpseti, cpsetr
1753 Hardcopy: NCAR Graphics Contouring and Mapping Tutorial
1755
1757 Copyright (C) 1987-2009
1758 University Corporation for Atmospheric Research
1759 The use of this Software is governed by a License Agreement.
1760UNIX March 1993 Conpack_params(3NCARG)