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09.22.2008 at 07:43PM PDT, ID: 23753715
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Attachment Details

OpenGL -- keyboard function

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9.3
Zones:

OpenGL Graphics & Game Programming, C Programming Language

I'm a beginner in OpenGL and C programming... I'm working on a program allows allows value changes via mouse movement (up/down).  

Currently, the motion function is called via a menu in the OpenGL window.   Now, I also need to activate the same motion function via a keyboard shortcut (instead of secting it from the menu).

Below code snippet outline the 2 functions: void keyboard() and void motion().
So, when pressing "m" (or "M") or the keyboard, I want to activate the motion() function.   Right now, I get a compile error on the line >> glutMotionFunc(motion); <<    

Also, I have several case statements in my motion() function (right now I only have >> case SIGXRES <<.

My question:  How can I call the motion function, and the specific case statement, via a keyboard shortcut e.g. clicking "x"?

Thanks,
EEH
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void keyboard (unsigned char key, int x, int y)
{
   switch (key) {
      case 'x':
	 glutMotionFunc(motion);
         break;
         
      case 27:
         exit(0);
         break;
         
      default:
         break;
   }
}
 
// *******************************************
 
void motion(int x, int y)
{
	static int first = 0;
	static int yPrev;
	if (first == 0)
	{
		yPrev = y;
		first = 1;
		return;
	}
 
	switch (currentControl)
	{
		case SIGXRES:
			if	(y > yPrev)
				sigmaX -= 0.01;
			else
				sigmaX += 0.01;
				printf("sigmaX: %.2f\n", sigmaX);
			break;
	}
 
	yPrev = y;
	glutPostRedisplay();
}
 
Accepted Solution by fridom:

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20081119-EE-VQP-45 / EE_QW_2_20070628