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//													//	
//				Grafika Ypologiston					//
//	Onomateponymo : Minas Gjokas					//
//  Mitroo		  : 3000017							//
//													//
//													//
//													//
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void Render();
// The function responsible for drawing everything in the 
// OpenGL context associated to a window. 

void Paint_Orbit( float radius, int angledninety, float ellipse_edit );

void Paint_Ring(float bigside, float smallside);

void Resize(int w, int h);
// Handle the window size changes and define the world coordinate 
// system and projection type

void Init_OpenGL();
// Set up the OpenGL state machine and create a light source

void Idle();

void Key_Press(unsigned char key, int x, int y);