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/*

Basic sphere collision, program written by Anthony Eden (Frostysnowman4@hotmail.com)

Feel free to use/distribute code :D

*/

#include <DarkGDK.h>

//Some of this code is borrowed from Sparky's dll example, but I fully understand what every line does.
void positionCameraToObject( int objId, int thirdPerson)
{

	dbPositionCamera(dbObjectPositionX(objId),dbObjectPositionY(objId) + 5.0f,dbObjectPositionZ(objId));
	dbRotateCamera(dbObjectAngleX(objId),dbObjectAngleY(objId),dbObjectAngleZ(objId));
	if ( thirdPerson == 1 )
	{
		dbPitchCameraDown(25);
		dbMoveCamera(-18);
	}

}
double absoluteV(double input)
{
	if (input < 0)
	{
		return (-1*input);
	}
	else
	{
		return input;
	}


}
bool checkForSphereCollision(int sphereId1, double sphere1Diameter, int sphereId2, double sphere2Diameter)
{
	double distance, dx, dy, dz;

	dx = dbObjectPositionX(sphereId1) - dbObjectPositionX(sphereId2);
	
	dy = dbObjectPositionY(sphereId1) - dbObjectPositionY(sphereId2);

	dz = dbObjectPositionZ(sphereId1) - dbObjectPositionZ(sphereId2);
	
	distance = sqrt((dx*dx) + (dy*dy) + (dz*dz));

	if (distance <= (sphere1Diameter + sphere2Diameter)/2)
	{
		return true;
	}
	else
	{
		return false;
	}
}
void DarkGDK ( void )
{
	
	dbSyncOn   ( );
	dbSyncRate ( 60 );

	// set our random seed to a value from the timer, this will help
	// to ensure each time we run our program the random values appear
	// more random
	dbRandomize ( dbTimer ( ) );
	
	int sphereDiam1;
	sphereDiam1 = dbRND(8) + 1;

	int sphereDiam2;
	sphereDiam2 = dbRND(8) + 1;


	dbMakeObjectSphere ( 1, sphereDiam1, 30, 30);
	dbMakeObjectSphere ( 2, sphereDiam2, 30, 30);

	dbPositionObject ( 1, 10, 2, 0);
	dbPositionObject ( 2, 10, 2, 20);

	//random colors- yay!
	dbColorObject ( 1, dbRgb ( dbRnd ( 255 ), dbRnd ( 255 ), dbRnd ( 255 ) ) );
	dbColorObject ( 2, dbRgb ( dbRnd ( 255 ), dbRnd ( 255 ), dbRnd ( 255 ) ) );

	//LUV THAT SPEC
	dbSetObjectSpecularPower ( 1, 255 );
	dbSetObjectSpecularPower ( 2, 255 );

	// turn off ambient lighting for this object
	dbSetObjectAmbient ( 1, 0 );
	dbSetObjectAmbient ( 2, 0 );

	//initial camera position
	dbPositionCamera ( 10, 10, -20 );

	dbFixObjectPivot(1);
	dbFixObjectPivot(2);
	while ( LoopGDK ( ) )
	{
		dbText ( 0, 0, "Basic sphere collision" );
		dbText ( 0, 10, "Use the arrow keys to move:\n Up/back: move forward/backwards \n Left/right: turn left/right." );
			
		dbText ( 0, 460, "Frostysnowman4@hotmail.com" );

		if (dbRightKey() == 1){
			dbYRotateObject(1, dbObjectAngleY (1) + 1.8f);
		}
		if (dbLeftKey() == 1){
			dbYRotateObject(1, dbObjectAngleY (1) - 1.8f);
		}

		//check for "w" key
		if (dbUpKey() == 1){
			dbMoveObject(1, .1f);
			if (checkForSphereCollision(1, sphereDiam1, 2, sphereDiam2) == true)
			{
				//changes the values BEFORE dbSync ( ) is called so you don't see the flicker of the sphere moving back to its pos before.
				dbMoveObject(1, -.1f);
			}
		}


		if (dbDownKey() == 1){
			dbMoveObject(1, -.1f);
			if (checkForSphereCollision(1, sphereDiam2, 2, sphereDiam2) == true)
			{
				//changes the values BEFORE dbSync ( ) is called so you don't see the flicker of the sphere moving back to its pos before.
				dbMoveObject(1, +.1f);
			}
		}
		positionCameraToObject(1, 1);


		dbSync ( );
	}

	// before quitting delete our objects
	dbDeleteObject (1);
	dbDeleteObject (2);
}