Function:ns2vf4nc
From S2PLOT
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ns2vf4nc
4-vertex facet with coloured vertices and normals given.
Prototype
void ns2vf4nc(XYZ *P, XYZ *N, COLOUR *col);
Description
The most general function for drawing a 4-vertex facet with coloured vertices. The vertices are given by the array P, normals are in the array N, and the RGB colours for vertices are in col. The other 4-vertex functions call this function.
See Also
| ns2vf4 | 4-vertex facet with single colour and automatic normals. |
| ns2vf4n | 4-vertex facet with single colour and normals given. |
| ns2vf4c | 4-vertex facet with coloured vertices and automatic normals. |
| ns2vf4t | Textured 4-vertex facet, scale in [0,1]; trans = 'o' or 't'. |
| struct_COLOUR | Data structure for (r,g,b) colour indices. |
| struct_XYZ | Data structure for (x,y,z) coordinates. |
Code Example
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "s2plot.h"
int main(int argc, char *argv[])
{
XYZ vertex[4]; /* 4 vertices */
XYZ normal[4]; /* Normals */
COLOUR col[4]; /* Colours */
int i;
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 */
vertex[0].x = 0.0; vertex[0].y = 0.0; vertex[0].z = 0.0;
vertex[1].x = 0.5; vertex[1].y = 0.0; vertex[1].z = 0.0;
vertex[2].x = 0.5; vertex[2].y = -0.4; vertex[2].z = 1.0;
vertex[3].x = 0.0; vertex[3].y = -0.4; vertex[3].z = 1.0;
for (i=0;i<4;i++) {
normal[i].x = drand48()*2.0 - 1.0;
normal[i].y = drand48()*2.0 - 1.0;
normal[i].z = drand48()*2.0 - 1.0;
col[i].r = drand48();
col[i].g = drand48();
col[i].b = drand48();
}
ns2vf4nc(vertex, normal, col); /* Draw the polygon */
s2show(1); /* Open the s2plot window */
return 1;
}
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