#include "ball.h"

#include "playingfield.h"

#include <string.h>



extern LPDIRECTDRAW	lpDDraw;					//the directdraw object

extern LPDIRECTDRAWSURFACE	lpPrimarySurface;		//the primary surface

extern LPDIRECTDRAWSURFACE lpOffScreenSurface;		//an offscreen surface

extern LPDIRECTDRAWSURFACE lpBackGroundSurface;	//offsreen surface for the background

extern LPDIRECTDRAWSURFACE lpBackBuffer;			//Backbuffer for page-flipping





CBall::CBall()

{

	x = 0;

	y = 0;

	BallSprite = new CSprite( lpOffScreenSurface, "ball.bmp" );

	SpriteXOffset = BallSprite->GetWidth() / 2;

	SpriteYOffset = BallSprite->GetHeight() / 2;

}



CBall::CBall( long Xin, long Yin, C2DVector Vin )

{

	x = Xin;

	y = Yin;

	Velocity = Vin;



	BallSprite = new CSprite( lpOffScreenSurface, "ball.bmp" );

	SpriteXOffset = BallSprite->GetWidth() / 2;

	SpriteYOffset = BallSprite->GetHeight() / 2;

}



CBall::~CBall()

{

	delete BallSprite;

	BallSprite = NULL;

}



void CBall::SetParent( CPlayingField* newparent )

{

	parent = newparent;

}



void CBall::draw( LPDIRECTDRAWSURFACE Surface )

{

	RECT rSource;

	rSource.bottom = BallSprite->GetY() + BallSprite->GetHeight();

	rSource.left = BallSprite->GetX();

	rSource.right = BallSprite->GetX() + BallSprite->GetWidth();

	rSource.top = BallSprite->GetY();



	Surface->BltFast( x - SpriteXOffset, y - SpriteYOffset, BallSprite->GetLocation(), &rSource, DDBLTFAST_WAIT | DDBLTFAST_SRCCOLORKEY );

}



void CBall::SetVelocity( long speed, int angle )

{

	Velocity.SetLength( speed );

	Velocity.SetAngle( angle );

}



void CBall::move()

{

	RECT Bounds;

	RECT PadBounds;



	x = x + Velocity.GetX();

	y = y + Velocity.GetY();



	C2DVector tnormal;

	tnormal.SetLength( 10 );



	Bounds = parent->GetBoundaries();



	PadBounds = parent->ThePad->GetPadArea();



	if( (x > PadBounds.left) &&

		(x < PadBounds.right) &&

		(y > PadBounds.top) )

	{

		tnormal.SetAngle( 90 );

		HitBoundary( &tnormal );

	}



	if( x > Bounds.right )

	{

		tnormal.SetAngle( 180 );

		HitBoundary( &tnormal );

	}

	if( x < Bounds.left )

	{

		tnormal.SetAngle( 0 );

		HitBoundary( &tnormal );

	}

	if( y > Bounds.bottom )

	{

		tnormal.SetAngle( 90 );

		HitBoundary( &tnormal );

	}

	if( y < Bounds.top )

	{

		tnormal.SetAngle( 270 );

		HitBoundary( &tnormal );

	}

		

}



void CBall::HitBoundary( C2DVector* BoundaryNormal )

{



	int angle;

	int OppAngle;

	int NormDiffAngle;



	angle = Velocity.GetAngle();



	OppAngle = (angle + 180) % 360;



	if( BoundaryNormal->GetAngle() >= OppAngle )

	{

		NormDiffAngle = BoundaryNormal->GetAngle() - OppAngle;

		angle = (BoundaryNormal->GetAngle() + NormDiffAngle) % 360;

	}

	if( BoundaryNormal->GetAngle() < OppAngle )

	{

		NormDiffAngle = OppAngle - BoundaryNormal->GetAngle();

		angle = BoundaryNormal->GetAngle() - NormDiffAngle;

		if( angle < 0 ) angle += 360;

	}



	Velocity.SetAngle( angle );

}