Function:s2qwc
From S2PLOT
(Difference between revisions)
Revision as of 02:13, 29 August 2011
s2qwc
Query the window clipping mode.
Prototype
int s2qwc(void);
Description
Query whether clipping is being applied to geometry. When enabled, clipping means points not within the world coordinate bounds as defined by the most recent call to s2swin, will not be drawn. The initial implementation applies to points only, future work may apply the clipping to lines and facets as well. Enable/disable/toggle (1,0,-1) clipping.
See Also
| s2swc | Set the window clipping mode. |
Code Example
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "s2plot.h"
void cb(double *t, int *kc)
{
int N = 100; /* Number of points */
static int flag = -1; /* Flag for initialisation */
static XYZ xyz[100]; /* Array of point positions */
static COLOUR col[100]; /* Array of colours */
int i; /* Loop variable */
if (flag < 0) { /* First time through? */
for (i=0;i<N;i++) {
xyz[i].x = drand48()*2.0 - 1.0; /* Random data positions */
xyz[i].y = drand48()*2.0 - 1.0;
xyz[i].z = drand48()*2.0 - 1.0;
col[i].r = drand48(); /* Random data colours */
col[i].g = drand48();
col[i].b = drand48();
}
flag = 1; /* Set the flag */
}
s2swin(-0.8,0.8,-0.8,0.8,-0.8,0.8); /* Set new plotting window */
for (i=0;i<N;i++) {
ns2vthpoint(xyz[i], col[i], 3); /* Draw the point */
}
if (*kc % 2 == 1) /* Check for keyboard press */
s2twc(1); /* Turn on clipping */
else
s2twc(0); /* Turn off clipping */
int wc = s2qwc(); /* Query clipping state */
char text[32];
sprintf(text, "Clipping state: %d\n",wc); /* Prepare a text string */
s2textxy(0.0,0.0,0.0, text); /* Display text string */
s2lab("","","","Press <space> to toggle clipping state");
}
int main(int argc, char *argv[])
{
srand48((long)time(NULL)); /* Seed random numbers */
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 */
cs2scb(cb); /* Install a dynamic callback */
s2show(1); /* Open the s2plot window */
return 1;
}
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