ddbouncingball_engine.h

symbian平台下的一个游戏源代码

// DDBouncingBall_Engine.h
// ---------------------------
//
// Copyright (c) 2002 Symbian Ltd.  All rights reserved.
//

////////////////////////////////////////////////////////////////////
//
//	class CDDBouncingBallEngine
//
//		Derives from CTimer both to control behaviour of our bouncing 
//		ball, and because we our CDirectScreenAccess container class must
//		be an Active Object.
//
//		We implement MDirectScreenAccess rather than MAbortDirectScreenAccess
//		so that we are notified not only when to abort drawing, but also when
//		its safe to restart.
//
//		Bouncing ball is achieved by blitting a bitmap of a ball to the drawing
//		region. Collisions are checked and direction variable updated accordingly.
//		One of the benefits of the Direct Screen Access framework is that 
//		we can be confident that the TRegion that we are allowed to draw to 
//		will not overlap or interfere with something being drawn by the Windows
//		server. The drawable region is updated before a Restart notification
//		is received.
//
////////////////////////////////////////////////////////////////////

#ifndef __DDBOUNCINGBALL_ENGINE_H
#define __DDBOUNCINGBALL_ENGINE_H

#include <w32std.h>


enum TDDBouncingBallEnginePanics
    {
    EDDBouncingAlreadyStarted = 1,
	EDDBouncingAlreadyStopped
    };



class CDDBouncingBallEngine : public CTimer,	public MDirectScreenAccess	
	{

public:

	// Construction & destruction
	CDDBouncingBallEngine 
		(
		RWsSession& aClient, 
		CWsScreenDevice& aScreenDevice, 
		RWindow& aWindow,
		CFbsBitmap* aBitmap,
		CFbsBitmap* aBitmapMask,
		TInt aXVelocity, 
		TInt aYVelocity
		);

	~CDDBouncingBallEngine();
	void ConstructL();

public:

	// Start and stop the bouncing ball
	void StartBouncingL();
	void StopBouncing();

	// Are we bouncing
	inline TBool Bouncing(){return iBouncing;}
	
private:

	// Implement MDirectScreenAccess 
	void Restart(RDirectScreenAccess::TTerminationReasons aReason);
	void AbortNow(RDirectScreenAccess::TTerminationReasons aReason);

private:

	// Implement CTimer
	void RunL();
	void DoCancel();

private:

	void MoveBall();

private:

	// Window server handling
	RWsSession& iClient;
	CWsScreenDevice& iScreenDevice;
	RWindow& iWindow;

	// Direct Screen Access
	CDirectScreenAccess* iDirectScreenAccess;
	CFbsBitGc* iGc;
	RRegion* iRegion;
	
	// Bouncing ball bitmap images
	CFbsBitmap* iBallImage;
	CFbsBitmap* iBallImageMask;

	// Positional plus directional information
	TPoint iPosition;
	TInt iXVelocity;
	TInt iYVelocity;

	// Are we bouncing
	TBool iBouncing;
	
	};

#endif