1CPCLAM(3NCARG) NCAR GRAPHICS CPCLAM(3NCARG)
2
6 CPCLAM - Adds contour lines to an area map. This is part of the process
7 of drawing a solid-fill contour plot.
8
10 CALL CPCLAM (ZDAT, RWRK, IWRK, IAMA)
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13 #include <ncarg/ncargC.h>
14 void c_cpclam (float *zdat, float *rwrk, int *iwrk,
16 int *iama)
17
19 The first three arguments are arrays used in the last call to CPRECT,
20 CPSPS1, or CPSPS2, the contents of which must not have been changed
21 since that call.
22 ZDAT (REAL array, dimensioned as specified in the last call to
24 CPRECT, CPSPS1, or CPSPS2, input) is the data array.
25 RWRK (REAL array, dimensioned as specified in the last call to
27 CPRECT, CPSPS1, or CPSPS2, input/output) is the real
28 workspace array.
29 IWRK (INTEGER array, dimensioned as specified in the last call
31 to CPRECT, CPSPS1, or CPSPS2, input/output) is the integer
32 workspace array.
33 IAMA (INTEGER array, dimensioned as specified in a call to
35 ARINAM, in the package Areas) is the array containing the
36 area map to which contour lines are to be added.
37
39 The C-binding argument descriptions are the same as the FORTRAN
40 argument descriptions.
41
43 The routine CPCLAM, which adds contour lines generated from the data in
44 the array ZDAT to the area map in the array IAMA, may be called at any
45 time after the initialization call to CPRECT, CPSPS1, or CPSPS2. The
46 area map must previously have been initialized by a call to the routine
47 ARINAM in the utility Areas.
48 The contour lines added to the area map are as specified by the first
50 'NCL' elements of the parameter arrays 'CLV', 'AIA', and 'AIB'. If
51 'NCL' is zero, CPPKCL is called to generate these values.
52 The contour levels defined by the first 'NCL' elements of the parameter
54 array 'CLV' are examined. If a given contour level is associated with
55 a non-zero value of 'AIA' and/or a non-zero value of 'AIB', then
56 contour lines at that contour level are added to the area map. If
57 there is an associated non-zero value of 'AIA', it is used as the area
58 identifier for the area "above" the line (where field values are
59 greater than they are along the line); otherwise, a zero is used. If
60 there is an associated non-zero value of 'AIB', it is used as the area
61 identifier for the area "below" the line (where field values are less
62 than they are along the line); otherwise, a zero is used. Note that a
63 given contour level may occur more than once in the internal parameter
64 array 'CLV', but there must be at most one non-zero value of 'AIA' and
65 at most one non-zero value of 'AIB' associated with it; otherwise, an
66 error exit occurs.
67 If the parameter 'T2D' has a non-zero value, the contour lines are
69 smoothed, using cubic splines under tension.
70 Four other types of lines are added to the area map by CPCLAM: (1) the
72 edge of the current viewport and possibly a set of vertical lines
73 within the viewport, (2) the edge of the grid, (3) the edges of
74 special-value areas, if any, and (4) the edges of out-of-range areas,
75 if any. The area identifier for the outside of the viewport is always
76 -1. You can use elements of the parameter array 'AIA' for 'PAI' = -1,
77 -2, and -3 to specify the area identifiers to be used for the outside
78 of the grid, the inside of a special-value area, and the inside of an
79 out-of-range area, respectively; the default values of all three are
80 -1's. Area identifiers for all other sides of these edges are
81 determined from the area-identifier information given for the contour
82 levels.
83 Lines are added to the area map in the following order:
85 · the edge of the viewport and the vertical lines within it,
87 · the edges of the out-of-range areas, if any,
89 · the edge of the grid,
91 · the edges of the special-value areas, if any, and,
93 · the contour lines, in order of increasing contour level.
95 The edge of the viewport may actually be added to the area map twice:
97 · as part of the edge group with group identifier 'GIC', and
99 · as part of the edge group with group identifier 'GIS'.
101 Vertical lines, if any, are added with group identifier 'GIS'.
103 The object of the edge group with group identifier 'GIS' is to break up
105 the areas represented by the area map into smaller pieces. Whether this
106 is done or not is under your control, by means of the internal
107 parameters 'NVS' and 'GIS'. For more information, see the descriptions
108 of those internal parameters in the conpack_params man page.
109 If, during the last call to CPRECT, CPSPS1 or CPSPS2, the data being
111 contoured were found to be essentially constant, then no contour lines
112 are added to the area map; the other lines are added, however.
113
115 Use the ncargex command to see the following relevant examples:
116 ccpcldm, ccpfil, ccplbam, ccpllb, ccpllc, ccplll, ccpllo, ccpllp,
117 ccpllt, ccpllw, ccppc, ccppc1, ccppc2, ccppc3, ccppc4, ccppole, ccprc,
118 ccpscam, ccpt2d, ccpvs, colcon, cpex01, cpex02, cpex03, cpex04, cpex05,
119 cpex07, cpex08, vvex01, tconpa, fsfsgfa.
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122 To use CPCLAM or c_cpclam, load the NCAR Graphics libraries ncarg,
123 ncarg_gks, and ncarg_c, preferably in that order.
124
126 See the conpack man page for a description of all Conpack error
127 messages and/or informational messages.
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130 Online: conpack, cpback, cpchcf, cpchcl, cpchhl, cpchil, cpchll,
131 cpcica, cpcldm, cpcldr, cpcltr, cpcnrc, cpdrpl, cpezct, cpgetc, cpgeti,
132 cpgetr, cplbam, cplbdr, cpmpxy, cpmviw, cpmvrw, cppkcl, cppklb, cprect,
133 cprset, cpscae, cpsetc, cpseti, cpsetr, cpsps1, cpsps2, ncarg_cbind
134 Hardcopy: NCAR Graphics Contouring and Mapping Tutorial
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138 Copyright (C) 1987-2009
139 University Corporation for Atmospheric Research
140 The use of this Software is governed by a License Agreement.
142UNIX March 1993 CPCLAM(3NCARG)