Function:s2scr
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s2scr
Set colour representation, ie. define a colour associated with an index.
Prototype
void s2scr(int idx, float r, float g, float b);
Description
Set colour representation associated with index idx. Once defined this colour can be selected and used. The default colours (indices 0..15) can be redefined.
Note that for historical reasons, the variable type (float) used in setting and querying the colour index is not the same as the variable type of the COLOUR data structure (double).
See Also
| s2sci | Set the pen colour by index. |
| s2scir | Set the range of colour indices used for shading. |
PGPLOT Equivalent
Code Example
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "s2plot.h"
int main(int argc, char *argv[])
{
int i; /* Loop variable */
int N = 50; /* Number of points */
float x[50], y[50], z[50]; /* Coordinates of points */
float r, g, b; /* RGB colours */
int symbol = 1; /* Point symbol */
int offset = 32; /* Starting colour */
srand48((long)time(NULL)); /* Seed random numbers */
for (i=0;i<N;i++) {
x[i] = drand48()*2.0 - 1.0;
y[i] = drand48()*2.0 - 1.0;
z[i] = drand48()*2.0 - 1.0;
}
s2opend("/?",argc, argv); /* Open the display */
s2swin(-1.,1., -1.,1., -1.,1.); /* Set the window coordinates */
s2box("BCDET",0,0,"BCDET",0,0,"BCDET",0,0); /* Draw coordinate box */
s2slw(5); /* Sets size of point */
s2scir(offset, offset+N); /* Set the colour index range */
for (i=offset;i<(offset+N);i++) {
r = drand48(); /* Choose random red value */
g = r; /* Green = Blue = Red */
b = r; /* means grey-scale! */
s2scr(i, r, g, b); /* Set colour representation */
}
for (i=0;i<N;i++) {
s2sci(offset+i); /* Set the colour */
s2pt1(x[i],y[i],z[i],symbol); /* Draw a single point */
}
s2show(1); /* Open the s2plot window */
return 1;
}
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