Function:ns2vf4c

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ns2vf4c

4-vertex facet with coloured vertices and automatic normals.

Prototype

void ns2vf4c(XYZ *P, COLOUR *col);

Description

Draw a 4-vertex facet with a coloured vertices. The vertices are given by the array P, normals are calculated automatically, and the RGB colours for each vertex are stored in the array col.

See Also

ns2vf4 4-vertex facet with single colour and automatic normals.
ns2vf4n 4-vertex facet with single colour and normals given.
ns2vf4nc 4-vertex facet with coloured vertices and normals given.
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 */
   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++) {
      col[i].r    = drand48();
      col[i].g    = drand48();
      col[i].b    = drand48();
   }

   ns2vf4c(vertex, col);         		/* Draw the polygon */

   s2show(1);					/* Open the s2plot window */
   
   return 1;
}

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