Function:ds2vbbr
From S2PLOT
(Difference between revisions)
| Revision as of 03:20, 10 March 2008 S2plot admin (Talk | contribs) ← Previous diff |
Current revision S2plot admin (Talk | contribs) |
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| Line 1: | Line 1: | ||
| ==ds2vbbr== | ==ds2vbbr== | ||
| - | Draw a (dynamic) "billboard" texture with specified rotation. | + | Draw a (dynamic) billboard texture with specified rotation. |
| ==Prototype== | ==Prototype== | ||
| Line 14: | Line 14: | ||
| == See Also == | == See Also == | ||
| <table> | <table> | ||
| - | <tr><td>[[Function:ds2bb | ds2bb]]</td><td>. </td></tr> | + | <tr><td>[[Function:ds2bb | ds2bb]]</td><td>Draw a (dynamic) billboard: a textured facet that always faces the camera. </td></tr> |
| - | <tr><td>[[Function:ds2vbb | ds2vbb]]</td><td>. </td></tr> | + | <tr><td>[[Function:ds2vbb | ds2vbb]]</td><td>Draw a (dynamic) billboard: a textured facet that always faces the camera. </td></tr> |
| </table> | </table> | ||
| ==Code Example== | ==Code Example== | ||
| <code><pre> | <code><pre> | ||
| + | #include <stdio.h> | ||
| + | #include <stdlib.h> | ||
| + | #include <time.h> | ||
| + | #include "s2plot.h" | ||
| + | |||
| + | unsigned int tid; | ||
| + | |||
| + | void cb(double *t, int *kc) | ||
| + | { | ||
| + | XYZ xyz = {0.0, 0.3, 0.4}; /* Location */ | ||
| + | float isize = 0.02; /* Texture scale */ | ||
| + | XYZ str = { 0.0, 0.0, 0.0}; /* No stretch */ | ||
| + | COLOUR col = { 1.0, 1.0, 0.0 }; /* Yellow */ | ||
| + | float alpha = 0.9; /* Alpha channel */ | ||
| + | char trans = 's'; /* Transparency */ | ||
| + | float pangle = 45.0; /* Rotation angle - degrees */ | ||
| + | |||
| + | ds2vbbr(xyz, str, isize, pangle, col, tid, alpha, trans); /* Draw the billboard */ | ||
| + | } | ||
| + | |||
| + | int main(int argc, char *argv[]) | ||
| + | { | ||
| + | int width = 16, height = 16; /* Dimensions of texture */ | ||
| + | int i, j; /* Loop variables */ | ||
| + | int idx; /* Index into texture array */ | ||
| + | char *tex; /* Array of texture values */ | ||
| + | |||
| + | srand48((long)time(NULL)); /* Seed random numbers */ | ||
| + | s2opend("/?",argc,argv); /* Open the display */ | ||
| + | s2svp(-1.0,1.0, -1.0,1.0, -1.0,1.0); /* Set the viewport coords */ | ||
| + | s2swin(-1.0,1.0, -1.0,1.0, -1.0,1.0); /* Set the window coordinates */ | ||
| + | s2box("BCDE",0,0,"BCDE",0,0,"BCDE",0,0); /* Draw a bounding box */ | ||
| + | |||
| + | tid = ss2ct(width, height); /* Create a new texture */ | ||
| + | tex = ss2gt(tid, &width, &height); /* Get the texture */ | ||
| + | |||
| + | for (j=0;j<height;j++) { | ||
| + | for (i=0;i<width;i++) { | ||
| + | idx = (j*width + i) * 4; /* Stored as (r,g,b,alpha) */ | ||
| + | tex[idx ] = 127*drand48()+128; /* Randomish red */ | ||
| + | tex[idx+1] = 0; /* Green */ | ||
| + | tex[idx+2] = 0; /* Blue */ | ||
| + | /* Do nothing to alpha */ | ||
| + | } | ||
| + | } | ||
| + | ss2pt(tid); /* Push texture for usage */ | ||
| + | |||
| + | cs2scb(&cb); /* Install a callback */ | ||
| + | |||
| + | s2show(1); /* Open the s2plot window */ | ||
| + | |||
| + | return 1; | ||
| + | } | ||
| + | |||
| </pre></code> | </pre></code> | ||
| [[S2PLOT:Function List | Back]] to S2PLOT function list. | [[S2PLOT:Function List | Back]] to S2PLOT function list. | ||
| __NOTOC__ | __NOTOC__ | ||
| __NOEDITSECTION__ | __NOEDITSECTION__ | ||
Current revision
ds2vbbr
Draw a (dynamic) billboard texture with specified rotation.
Prototype
void ds2vbbr(XYZ iP, XYZ iStretch, float isize, float ipangle, COLOUR iC,
unsigned int itexid, float alpha, char trans);
Description
Draw a (dynamic) "billboard", with rotation ipangle (in degrees) of the texture about the view direction
See Also
| ds2bb | Draw a (dynamic) billboard: a textured facet that always faces the camera. |
| ds2vbb | Draw a (dynamic) billboard: a textured facet that always faces the camera. |
Code Example
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "s2plot.h"
unsigned int tid;
void cb(double *t, int *kc)
{
XYZ xyz = {0.0, 0.3, 0.4}; /* Location */
float isize = 0.02; /* Texture scale */
XYZ str = { 0.0, 0.0, 0.0}; /* No stretch */
COLOUR col = { 1.0, 1.0, 0.0 }; /* Yellow */
float alpha = 0.9; /* Alpha channel */
char trans = 's'; /* Transparency */
float pangle = 45.0; /* Rotation angle - degrees */
ds2vbbr(xyz, str, isize, pangle, col, tid, alpha, trans); /* Draw the billboard */
}
int main(int argc, char *argv[])
{
int width = 16, height = 16; /* Dimensions of texture */
int i, j; /* Loop variables */
int idx; /* Index into texture array */
char *tex; /* Array of texture values */
srand48((long)time(NULL)); /* Seed random numbers */
s2opend("/?",argc,argv); /* Open the display */
s2svp(-1.0,1.0, -1.0,1.0, -1.0,1.0); /* Set the viewport coords */
s2swin(-1.0,1.0, -1.0,1.0, -1.0,1.0); /* Set the window coordinates */
s2box("BCDE",0,0,"BCDE",0,0,"BCDE",0,0); /* Draw a bounding box */
tid = ss2ct(width, height); /* Create a new texture */
tex = ss2gt(tid, &width, &height); /* Get the texture */
for (j=0;j<height;j++) {
for (i=0;i<width;i++) {
idx = (j*width + i) * 4; /* Stored as (r,g,b,alpha) */
tex[idx ] = 127*drand48()+128; /* Randomish red */
tex[idx+1] = 0; /* Green */
tex[idx+2] = 0; /* Blue */
/* Do nothing to alpha */
}
}
ss2pt(tid); /* Push texture for usage */
cs2scb(&cb); /* Install a callback */
s2show(1); /* Open the s2plot window */
return 1;
}
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