1ARDRLN(3NCARG) NCAR GRAPHICS ARDRLN(3NCARG)
2
6 ARDRLN - Draws a polyline that is masked by a given area map.
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9 CALL ARDRLN (MAP,XCD,YCD,NCD,XCS,YCS,MCS,IAI,IAG,MAI,LPR)
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12 #include <ncarg/ncargC.h>
13 void c_ardrln (int *map, float *xcd, float *ycd, int ncd, float *xcs,
15 float *ycs, int mcs, int *iai, int *iag, int mai, int (*lpr)(float
16 *xcs, float *ycs, int *ncs, int *iai, int *iag, int *nai))
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19 MAP (an input/output array of type INTEGER) - An array
20 containing an area map that has been initialized by a call
21 to ARINAM and to which edges have been added by calls to
22 AREDAM. If you did not preprocess the area map by calling
23 ARPRAM, ARDRLN calls it before doing anything else.
24 Note: As part of initializing the area map, ARINAM stores
26 the dimension of MAP in MAP(1); therefore, the dimension
27 does not have to be given as an argument in calls to
28 ARDRLN.)
29 XCD (an input array, dimensioned NCD, of type REAL) - The X
31 coordinates, in the user coordinate system, of the points
32 defining the polyline.
33 YCD (an input array, dimensioned NCD, of type REAL) - The Y
35 coordinates, in the user coordinate system, of the points
36 defining the polyline.
37 NCD (an input expression of type INTEGER) - The number of
39 points defining the polyline.
40 XCS (a workspace array, dimensioned MCS, of type REAL) - Used
42 by ARDRLN in calls to LPR, the user-supplied line-
43 processing routine, to hold the X coordinates of the
44 polyline segment contained in a given area.
45 YCS (a workspace array, dimensioned MCS, of type REAL) - Used
47 by ARDRLN in calls to LPR, the user-supplied line-
48 processing routine, to hold the Y coordinates of the
49 polyline segment contained in a given area.
50 MCS (an input expression of type INTEGER) - Dimension of each
52 of the arrays XCS and YCS.
53 IAI (a workspace array, dimensioned MAI, of type INTEGER) - The
55 area identifier array, used in calls to LPR, the user-
56 supplied line-processing routine.
57 IAG (a workspace array, dimensioned MAI, of type INTEGER) - The
59 group identifier array, used in calls to LPR, the user-
60 supplied line-processing routine.
61 MAI (an input expression of type INTEGER) - Dimension of each
63 of the arrays IAI and IAG. MAI must be greater than or
64 equal to n, where n is the number of groups in the area
65 map.
66 LPR (a subroutine) - A line-processing routine that you supply
68 for ARDRLN to call. LPR must be declared EXTERNAL in the
69 routine that calls ARDRLN. LPR must have the following
70 structure:
71 SUBROUTINE LPR (XCS,YCS,NCS,IAI,IAG,NAI)
73 DIMENSION XCS(*),YCS(*),IAI(*),IAG(*)
74 (code to process polyline defined by XCS, YCS, IAI, and
76 IAG)
77 RETURN
79 END
80 XCS,YCS (input arrays, dimensioned NCS, of type REAL) -
82 Hold the X and Y coordinates, in NDCs, of NCS
83 points defining a piece of the original
84 polyline that is completely contained in one of
85 the areas defined by the area map.
86 NCS (an input expression of type INTEGER) - Number
88 of X and Y coordinates in the arrays XCS and
89 YCS.
90 IAI,IAG (input arrays, dimensioned NAI, of type
92 INTEGER) - Hold NAI pairs of area identifiers
93 and group identifiers, respectively, for the
94 area in which the piece of the polyline lies.
95 For each value of I from 1 to NAI, IAI(I) is
96 the area identifier for the area with respect
97 to the group of edges specified by the group
98 identifier IAG(I).
99 NAI (an input expression of type INTEGER) - Number
101 of values given in IAI and IAG. NAI equals the
102 number of groups of edges that you put in the
103 area map.
104 Before executing the first call to LPR, ARDRLN calls GETSET to retrieve
106 the current user-system mapping parameters and then executes the
107 following statement:
108 CALL SET (VPL,VPR,VPB,VPT,VPL,VPR,VPB,VPT,1)
110 where VPL, VPR, VPB, and VPT are the viewport left, right, bottom, and
112 top coordinates in NDCs.
113 This ensures correct results if the NDCs in XCS and YCS are used by the
115 line-processing routine LPR in calls to such routines as GPL and CURVE,
116 and it allows for clipping at the edges of the viewport. LPR may make
117 its own SET call to achieve some other effect. Before returning control
118 to the calling routine, ARDRLN calls SET again to restore the original
119 mapping parameters.
120
122 The C-binding argument descriptions are the same as the FORTRAN
123 argument descriptions.
124
126 Use the ncargex command to see the following relevant examples:
127 carline, tareas, fsppoint.
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130 To use ARDRLN or c_ardrln, load the NCAR Graphics libraries ncarg,
131 ncarg_gks, and ncarg_c, preferably in that order.
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134 See the areas man page for a description of all Areas error messages
135 and/or informational messages.
136
138 Online: areas, areas_params, ardbpa, aredam, argeti, argetr, argtai,
139 arinam, armvam, arpram, arscam, arseti, arsetr, ncarg_cbind
140 Hardcopy: NCAR Graphics Contouring and Mapping Tutorial
142
144 Copyright (C) 1987-2009
145 University Corporation for Atmospheric Research
146 The use of this Software is governed by a License Agreement.
147UNIX March 1993 ARDRLN(3NCARG)