sprite.java

国外人写的操作感挺好的一款滑雪游戏.结构也比较清楚

// Copyright (c) 2004 Venan Entertainment, Inc. All rights reserved.
//
// Venan Entertainment, Inc.,  Middletown, Connecticut 06457
// http://www.venan.com
//

//#if defined(_IS_NOKIA) && defined(_DRAW_PIXELS_SUPPORT)
//import com.nokia.mid.ui.DirectGraphics;
//import com.nokia.mid.ui.DirectUtils;
//#endif

import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import java.io.*;

//#ifdef _CLOSE_STREAMS
////#define CLOSE_IS(s) TorinoCanvas.closeInputStream(s);
////#define CLOSE_OS(s) TorinoCanvas.closeOutputStream(s);
//#else
//#endif

public class Sprite extends Drawable
{
//#ifdef _DEBUG
////#define DUMP_EXCEPTION(e)			{ //System.out.println( e.getMessage()); e.printStackTrace(); }
////#define DUMP_EXCEPTION_MSG(e,msg)	{ //System.out.println( msg + "\n" + e.getMessage()); e.printStackTrace(); }
////#define DEBUG_MSG(msg)				//System.out.println(msg)
//#else
//#endif

//#ifdef _PROFILE
////#define START_TIMER(a)				a = System.currentTimeMillis();
////#define STOP_TIMER(a)				a = System.currentTimeMillis() - a;
//#else
//#endif




	public Image m_image;
//#ifdef _DRAW_PIXELS_SUPPORT
//	public short[] m_pixels;
//#endif
	private int m_iImageWidth;
	private int m_iImageHeight;
	
	public int m_iFrameCountX;
	public int m_iFrameCountY;
	public int m_iNumFrames;
	
	public int m_iSequenceLength;

	public int m_iCurrentFrame;
	private int m_iPaintFrame;

	public int m_iFrameTime = 67;
	public int m_iRefX, m_iRefY;

	public int[] m_sequence;
	public int[] m_aiFrameOffsetsX;
	public int[] m_aiFrameOffsetsY;
	public int[] m_aiFrameSrcY;
	public int[] m_aiFrameWidths;
	
	public boolean m_bLooping = false;
	
	public Sprite( Image image )
	{
		m_image = image;
		m_iWidth = m_iImageWidth = image.getWidth();
		m_iHeight = m_iImageHeight = image.getHeight();
		m_iFrameCountX = m_iFrameCountY = 1;
		m_iSequenceLength = m_iNumFrames = 1;
	}

	public Sprite( Image image, int iWidth, int iHeight )
	{
		m_image = image;
		m_iWidth = iWidth;
		m_iHeight = iHeight;
		m_iImageWidth = image.getWidth();
		m_iImageHeight = image.getHeight();
		m_iFrameCountX = m_iImageWidth / iWidth;
		m_iFrameCountY = m_iImageHeight / iHeight;
		m_iSequenceLength = m_iNumFrames = m_iFrameCountX * m_iFrameCountY;
	}
	
	public Sprite( Image image, byte[] abyData )
	{
		m_image = image;
		m_iImageWidth = image.getWidth();
		m_iImageHeight = image.getHeight();
		m_iFrameCountX = 1;
		ByteArrayInputStream bs = null;
		DataInputStream ds = null;
		try
		{
			bs = new ByteArrayInputStream( abyData );
			ds = new DataInputStream( bs );
			m_iWidth = ds.readShort();
			m_iHeight = ds.readShort();
			m_iSequenceLength = m_iNumFrames = m_iFrameCountY = ds.readShort();
			m_aiFrameOffsetsX = new int[m_iNumFrames];
			m_aiFrameOffsetsY = new int[m_iNumFrames];
			m_aiFrameSrcY = new int[m_iNumFrames];
			m_aiFrameWidths = new int[m_iNumFrames];
			for (int i=0; i<m_iNumFrames; i++)
			{
				m_aiFrameOffsetsX[i] = ds.readShort();
				m_aiFrameOffsetsY[i] = ds.readShort();
				m_aiFrameSrcY[i] = ds.readShort();
				m_aiFrameWidths[i] = ds.readShort();
			}			
		}
		catch ( IOException e )
		{
		}
//#ifdef _CLOSE_STREAMS
//		finally
//		{
//			try
//			{
////				CLOSE_IS(ds);
////				CLOSE_IS(bs);
//			}
//			catch (Exception e)
//			{
//			}			
//		}		
//#endif
	}
	
//#ifdef _DRAW_PIXELS_SUPPORT
//	public Sprite( short[] pixels )
//	{
//		m_pixels = pixels;
//		m_iWidth = m_iImageWidth = pixels[0];
//		m_iHeight = m_iImageHeight = pixels[1];
//		m_iFrameCountX = m_iFrameCountY = 1;
//		m_iSequenceLength = m_iNumFrames = 1;
//	}
//
//	public Sprite( short[] pixels, int iWidth, int iHeight )
//	{
//		m_pixels = pixels;
//		m_iWidth = iWidth;
//		m_iHeight = iHeight;
//		m_iImageWidth = pixels[0];
//		m_iImageHeight = pixels[1];
//		m_iFrameCountX = m_iImageWidth / iWidth;
//		m_iFrameCountY = m_iImageHeight / iHeight;
//		m_iSequenceLength = m_iNumFrames = m_iFrameCountX * m_iFrameCountY;
//	}
//	
//	public Sprite( short[] pixels, byte[] abyData )
//	{
//		m_pixels = pixels;
//		m_iImageWidth = pixels[0];
//		m_iImageHeight = pixels[1];
//		m_iFrameCountX = 1;
//		ByteArrayInputStream bs = null;
//		DataInputStream ds = null;
//		try
//		{
//			bs = new ByteArrayInputStream( abyData );
//			ds = new DataInputStream( bs );
//			m_iWidth = ds.readShort();
//			m_iHeight = ds.readShort();
//			m_iSequenceLength = m_iNumFrames = m_iFrameCountY = ds.readShort();
//			m_aiFrameOffsetsX = new int[m_iNumFrames];
//			m_aiFrameOffsetsY = new int[m_iNumFrames];
//			m_aiFrameSrcY = new int[m_iNumFrames];
//			m_aiFrameWidths = new int[m_iNumFrames];
//			for (int i=0; i<m_iNumFrames; i++)
//			{
//				m_aiFrameOffsetsX[i] = ds.readShort();
//				m_aiFrameOffsetsY[i] = ds.readShort();
//				m_aiFrameSrcY[i] = ds.readShort();
//				m_aiFrameWidths[i] = ds.readShort();
//			}			
//		}
//		catch ( IOException e )
//		{
//		}
//#ifdef _CLOSE_STREAMS
//		finally
//		{
//			try
//			{
////				CLOSE_IS(ds);
////				CLOSE_IS(bs);
//			}
//			catch (Exception e)
//			{
//			}			
//		}		
//#endif
//	}
//#endif

	public final int getCenterX()
	{
		return m_iX + (m_iWidth>>1);
	}
		
	public final int getCenterY()
	{
		return m_iY + (m_iHeight>>1);
	}
		
	public void setFPS( int iFPS )
	{
		m_iFrameTime = 1000/iFPS;
	}
	
	public void setTime( int iTime )
	{
		m_iCurrentFrame = iTime / m_iFrameTime;
		if (m_bLooping)
			m_iCurrentFrame %= m_iSequenceLength;
		else
			m_iCurrentFrame =  ( ( (m_iCurrentFrame) <= (0) ) ? (0) : ( ( (m_iCurrentFrame) >= (m_iSequenceLength-1) ) ? (m_iSequenceLength-1) : (m_iCurrentFrame) ) ) ;
		calcPaintFrame();
	}
	
	public void nextFrame()
	{
		if( m_iCurrentFrame == m_iSequenceLength - 1 )
		{
			m_iCurrentFrame = 0;
		}
		else
		{
			m_iCurrentFrame++;
		}
		calcPaintFrame();
	}

	public void prevFrame()
	{
		if( m_iCurrentFrame == 0 )
		{
			m_iCurrentFrame = m_iSequenceLength - 1;
		}
		else
		{
			m_iCurrentFrame--;
		}
		calcPaintFrame();
	}

	public void setFrame( int iFrame )
	{
		m_iCurrentFrame =  ( ( (iFrame) <= (0) ) ? (0) : ( ( (iFrame) >= (m_iSequenceLength-1) ) ? (m_iSequenceLength-1) : (iFrame) ) ) ;
		calcPaintFrame();
	}

	public void setFrameSequence( int[] sequence )
	{
		m_sequence = sequence;
		m_iCurrentFrame = 0;
		m_iPaintFrame = 0;	
		if (m_sequence != null)
			m_iSequenceLength = m_sequence.length;
		else
			m_iSequenceLength = m_iNumFrames;
	}
	
	private void calcPaintFrame()
	{
		if (m_sequence != null)
			m_iPaintFrame = m_sequence[m_iCurrentFrame];
		else
			m_iPaintFrame = m_iCurrentFrame;
	}	
	
	int iClipX;
	int iClipY;
	int iClipWidth;
	int iClipHeight;
	int iPaintX;
	int iPaintY;
	int iSrcX;
	int iSrcY;
	int iWidth;
	int iHeight;
	public void paint( Graphics g )
	{
		if (m_aiFrameSrcY != null)
		{
			iPaintX = m_iX-m_iRefX+m_aiFrameOffsetsX[m_iPaintFrame];
			iPaintY = m_iY-m_iRefY+m_aiFrameOffsetsY[m_iPaintFrame];
			if (m_iPaintFrame == m_iFrameCountY-1)
				iHeight = m_iImageHeight-m_aiFrameSrcY[m_iPaintFrame];
			else
				iHeight = m_aiFrameSrcY[m_iPaintFrame+1]-m_aiFrameSrcY[m_iPaintFrame];
			iWidth = m_aiFrameWidths[m_iPaintFrame];
		}
		else
		{
			iPaintX = m_iX-m_iRefX;
			iPaintY = m_iY-m_iRefY;
			iWidth = m_iWidth;
			iHeight = m_iHeight;
		}		
		
//#ifdef _FAST_SPRITE_REJECT
		// better clipping code to reduce graphics calls
		if (iPaintX >= TorinoCanvas.m_iScreenWidth ||
			iPaintY >= TorinoCanvas.m_iScreenHeight ||
			iPaintX+iWidth <= 0 ||
			iPaintY+iHeight <= 0)
			return;
//#endif

		if (m_aiFrameSrcY != null)
		{
			iSrcX = 0;
			iSrcY = m_aiFrameSrcY[m_iPaintFrame];
		}
		else
		{
			iSrcX = m_iWidth*(m_iPaintFrame % m_iFrameCountX);
			iSrcY = m_iHeight*(m_iPaintFrame / m_iFrameCountX);
		}		

//#ifdef _IS_NokiaS60
//		int iOldClipX = TorinoCanvas.getClipX(g);
//		int iOldClipY = TorinoCanvas.getClipY(g);
//		int iOldClipWidth = TorinoCanvas.getClipWidth(g);
//		int iOldClipHeight = TorinoCanvas.getClipHeight(g);
//#else
		int iOldClipX = g.getClipX();
		int iOldClipY = g.getClipY();
		int iOldClipWidth = g.getClipWidth();
		int iOldClipHeight = g.getClipHeight();
//#endif
		
		g.clipRect( iPaintX, iPaintY, iWidth, iHeight );

//#ifdef _DRAW_PIXELS_SUPPORT
//		if (m_image != null)
//		{
//			g.drawImage( m_image, iPaintX - iSrcX, iPaintY - iSrcY, 
//				Graphics.TOP|Graphics.LEFT );		
//		}
//		else
//		{
//			DirectGraphics dg = DirectUtils.getDirectGraphics(g);
//			dg.drawPixels( m_pixels, true, 2 + iSrcX + (iSrcY*m_iImageWidth), 
//				m_iImageWidth, iPaintX, iPaintY, iWidth, iHeight, 0,
//				DirectGraphics.TYPE_USHORT_4444_ARGB );
//		}			
//#else
		g.drawImage( m_image, iPaintX - iSrcX, iPaintY - iSrcY, 
			Graphics.TOP|Graphics.LEFT );		
//#endif

//#ifdef _IS_NokiaS60
//		TorinoCanvas.setClip( g, iOldClipX, iOldClipY, iOldClipWidth, iOldClipHeight );
//#else
		g.setClip( iOldClipX, iOldClipY, iOldClipWidth, iOldClipHeight );
//#endif
	}
}