strange behaviour in glut

**wgan** · 07-16-2003

like this, when i press a key, the following function will be called:
//---------------------------------------------
static void move(int dir) //dir means direction
{
int i;
for(i=0; i<30; i++){
//recalculate some angle value
angle=(angle+degree)%360;
glutPostRedisplay();
}
}
//------------------------------------------------
angle is a static global variable, assum degree is set to 1.
the strange behaviour i can't understand is only the last angle value will be pass to display() that is 30! the value 1~29 are all ignored! Why this happen?
and I also found many variable-pass problems in glut. I really wonder if the glut is a good choice for opengl programming??

**Sayeh** · 07-29-2003

Next time, use the code tags--

Code:

static void move(int dir)                      //dir means direction
   {
   int i;
   for(i=0; i<30; i++)
      {
      angle=(angle+degree)%360;      //recalculate some angle value
      glutPostRedisplay();
      };
   }

Well, first of all, your loop only runs 0-29 (30 values). Second, 'i' isn't used for anything else. Thirdly, no function named 'display()' is shown.

Too many pieces missing. The reason you are seeing this missing 'display()' show anything at all is probably because you are simply falling through to it. Your loop is never executed once i = 30.

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