Function:ns2vf4xt
From S2PLOT
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ns2vf4xt
Draw a textured 4-vertex facet with alpha channel using a texture id.
Prototype
void ns2vf4xt(XYZ *P, COLOUR icol, unsigned int textureid, float iscale, char itrans, float ialpha);
Description
Draw a textured 4-vertex facet, using a texture id as returned by ss2lt; scale should be in the range [0,1] and trans = 'o' or 't' for opaque or transparent textures. The alpha channel is set by parameter ialpha.
See Also
| Textures | Important information on using textures in S2PLOT. |
| ss2lt | Load a texture for future (generally repeated) use. |
| ns2vf4x | Draw a textured 4-vertex facet using a texture id. |
| 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 "s2plot.h"
int main(int argc, char *argv[])
{
XYZ vertex[4]; /* 4 vertices */
COLOUR col = { 1.0, 0.0, 1.0 }; /* Yellowish */
float scale = 1.0; /* Scale for texture */
float ialpha = 0.5; /* Alpha channel */
int texid; /* ID for this texture */
char *texture = "firetile2_pow2_rgb.tga";
/* Texture in directory pointed to by S2PLOT_TEXPATH */
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 */
texid = ss2lt(texture);
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;
ns2vf4xt(vertex, col, texid, scale, 'o', ialpha);
/* Draw the polygon */
s2show(1); /* Open the s2plot window */
return 1;
}
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