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// Collision Detection
// Author: Yerrel

// www.binary-coder.com

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );

	// Create Camera 1 and set background color to be blue
	dbMakeCamera(1);
	dbColorBackdrop(1, dbRgb(0, 0, 150));
	//Move the camera back
	dbPositionCamera(1, 0, 0, -25);

	// Create a Sphere and a Cube and Set its color
	dbMakeObjectSphere(1, 4);
	dbColorObject(1, dbRgb(255, 0, 0));
	dbMakeObjectCube(2, 2); // Cube will be the wall..
	dbColorObject(2, dbRgb(0, 0, 255));
	// Scale the obejcts
	dbScaleObject(1, 70, 70, 10);
	dbScaleObject(2, 20, 400, 40);
	// Position the objects
	dbPositionObject(1, 15, 0, 0);
	dbPositionObject(2, -18, 0, 0);

	// Declare the position variables
	float x = 0.0, y = 0.0, z = 0.0, ax = -0.2;

	// Enter Mainloop
	// our main loop
	while ( LoopGDK ( ) )
	{
		// Check to if Object 1(Sphere) is colliding with Object 2
		// And check if the position of the Sphere is inside the visible area of the screen.
		if(dbObjectHit(1, 2) || dbObjectPositionX(1) > 15)
		{

			// If Collision or the Sphere is out of display then reverse the moving direction.
			ax = -ax;
			if(dbObjectPositionX(1) <15 )
				dbColorObject(2, dbRgb(dbRnd(255), dbRnd(255), dbRnd(255)));
		}

		// Change the color of the Sphere when it rebound.
		if(dbObjectPositionX(1) > 15) 
			dbColorObject(1, dbRgb(dbRnd(255), dbRnd(255), dbRnd(255)));


		//Update the X-position
		x = x + ax;
		dbPositionObject(1, x, y, z);

		// update the screen
		dbSync ( );
	}

	// return back to windows
	return;
}