Opengl with animation to shapes

OpenGL OpenGL: Basic Coding
1

void processSpecialKeys(int key, int x, int y)
{

if (key == GLUT_KEY_UP)
{
	// increase the size
	
}
else if (key == GLUT_KEY_DOWN)
{
	// decrease the size
}

}
void processNormalKeys (unsigned char key, int x, int y)
{

if (key == 'R' || key == 'r') // reset all
{
	// clear everything
}
else if (key == 27)
	exit (0);

}

How am I able to increase the size and decrease and also clear everything, do I need a for loop?

2

So I’m seeing all the:


    // do it yourself

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