better animate rate (Marcelo Magallon)
diff --git a/progs/demos/spriteblast.c b/progs/demos/spriteblast.c
index 63dc7d1..d6e9a4d 100644
--- a/progs/demos/spriteblast.c
+++ b/progs/demos/spriteblast.c
@@ -104,7 +104,6 @@
#define MEAN_VELOCITY 3.0
#define GRAVITY 2.0
-#define TIME_DELTA 0.025 /* The speed of time. */
/* Modeling units of ground extent in each X and Z direction. */
#define EDGE 12
@@ -139,6 +138,13 @@
float distance;
int i;
+ static double t0 = -1.;
+ double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
+ if (t0 < 0.0)
+ t0 = t;
+ dt = t - t0;
+ t0 = t;
+
motion = 0;
for (i=0; i<numPoints; i++) {
distance = pointVelocity[i][0] * theTime;
@@ -164,9 +170,9 @@
pointTime[i] = 0.0; /* Reset the particles sense of up time. */
}
motion = 1;
- pointTime[i] += TIME_DELTA;
+ pointTime[i] += dt;
}
- theTime += TIME_DELTA;
+ theTime += dt;
if (!motion && !spin) {
if (repeat) {
makePointList();