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animation rate patch (Marcello Magallon)

This commit is contained in:
Brian Paul 2005-01-09 16:52:53 +00:00
parent 1b058a06c2
commit 429efa9f00
2 changed files with 28 additions and 5 deletions
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18
progs/redbook/alpha3D.c
View File

@ -49,7 +49,7 @@
#define MAXZ 8.0
#define MINZ -8.0
#define ZINC 0.4
#define ZINC 4.
static float solidZ = MAXZ;
static float transparentZ = MINZ;
@ -130,11 +130,21 @@ void reshape(int w, int h)
void animate(void)
{
static double t0 = -1.;
if (solidZ <= MINZ || transparentZ >= MAXZ)
{
glutIdleFunc(NULL);
t0 = -1.;
}
else {
solidZ -= ZINC;
transparentZ += ZINC;
double t, dt;
t = glutGet(GLUT_ELAPSED_TIME) / 1000.;
if (t0 < 0.)
t0 = t;
dt = t - t0;
t0 = t;
solidZ -= ZINC*dt;
transparentZ += ZINC*dt;
glutPostRedisplay();
}
}
@ -163,7 +173,7 @@ void keyboard(unsigned char key, int x, int y)
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(500, 500);
glutCreateWindow(argv[0]);
init();

15
progs/redbook/double.c
View File

@ -45,6 +45,7 @@
#include <stdlib.h>
static GLfloat spin = 0.0;
static GLdouble t0 = 0.;
void display(void)
{
@ -58,9 +59,18 @@ void display(void)
glutSwapBuffers();
}
GLdouble gettime(void)
{
return (GLdouble)(glutGet(GLUT_ELAPSED_TIME)) / 1000.;
}
void spinDisplay(void)
{
spin = spin + 2.0;
GLdouble t, dt;
t = gettime();
dt = t - t0;
t0 = t;
spin = spin + 120.0*dt;
if (spin > 360.0)
spin = spin - 360.0;
glutPostRedisplay();
@ -88,7 +98,10 @@ void mouse(int button, int state, int x, int y)
switch (button) {
case GLUT_LEFT_BUTTON:
if (state == GLUT_DOWN)
{
t0 = gettime();
glutIdleFunc(spinDisplay);
}
break;
case GLUT_MIDDLE_BUTTON:
if (state == GLUT_DOWN)