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gondwana.ecr.mu.oz.au/pub/
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VOGLE.ZIP
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EXAMPLES
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SUNVIEW
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BALLS.C
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C/C++ Source or Header
|
1994-04-27
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2KB
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143 lines
#include <stdio.h>
#include "vogle.h"
#include <math.h>
#define RADIUS 10.0
#define SPHERE 1
static int inited = 0;
/*
* makesphere
*
* make a sphere object
*/
makesphere()
{
float i, r, z, a;
makeobj(SPHERE);
/*
* create the latitudinal rings
*/
for (i = 0; i < 180; i += 20) {
pushmatrix();
rotate(i, 'y');
circle(0.0, 0.0, RADIUS);
popmatrix();
}
/*
* create the longitudinal rings
*/
pushmatrix();
rotate(90.0, 'x');
for (a = -90.0; a < 90.0; a += 20.0) {
r = RADIUS * cos((double)a * PI / 180.0);
z = RADIUS * sin((double)a * PI / 180.0);
pushmatrix();
translate(0.0, 0.0, -z);
circle(0.0, 0.0, r);
popmatrix();
}
popmatrix();
closeobj();
}
/*
* a demonstration of objects
*/
draw_balls()
{
if (!inited) {
inited = 1;
fprintf(stderr, "Initialising\n");
vsetflush(0);
/*
* set up our viewing transformation
*/
perspective(90.0, 1.0, 0.001, 500.0);
lookat(13.0, 13.0, 8.0, 0.0, 0.0, 0.0, 0.0);
/*
* Call a routine to make the sphere object
*/
makesphere();
}
/*
* Now draw the sphere object scaled down. We use the pushmatrix
* and the popmatrix to preserve the transformation matrix so
* that only this sphere is drawn scaled.
*/
color(CYAN);
pushmatrix();
scale(0.5, 0.5, 0.5);
callobj(SPHERE);
popmatrix();
/*
* now we draw the same sphere translated, with a different
* scale and color.
*/
color(WHITE);
pushmatrix();
translate(0.0, -1.4 * RADIUS, 1.4 * RADIUS);
scale(0.3, 0.3, 0.3);
callobj(SPHERE);
popmatrix();
/*
* and maybe a few more times....
*/
color(RED);
pushmatrix();
translate(0.0, RADIUS, 0.7 * RADIUS);
scale(0.2, 0.2, 0.2);
callobj(SPHERE);
popmatrix();
color(GREEN);
pushmatrix();
translate(0.0, 1.5 * RADIUS, -RADIUS);
scale(0.15, 0.15, 0.15);
callobj(SPHERE);
popmatrix();
color(YELLOW);
pushmatrix();
translate(0.0, -RADIUS, -RADIUS);
scale(0.12, 0.12, 0.12);
callobj(SPHERE);
popmatrix();
color(BLUE);
pushmatrix();
translate(0.0, -2.0*RADIUS, -RADIUS);
scale(0.3, 0.3, 0.3);
callobj(SPHERE);
popmatrix();
font("times.rb");
ortho2(0.0, 1.0, 0.0, 1.0);
centertext(1);
textsize(0.08, 0.15);
move2(0.8, 0.5);
textang(-90.0);
drawstr("I'm very ordinary!");
vflush();
}