MySprite 2.0
类别: JAVA教程 
/**
为MIDP1.0写的Sprite类的升级版本 * <p>Title: 精灵类</p> * * <p>Description: </p> * * <p>Copyright: Copyright (c) 2004</p> * * <p>Company: </p> * * @author not attributable * @version 1.0 */import javax.microedition.lcdui.* ;public class MySprite { final public static int ByCollideXY = 0 ; final public static int ByCollideArea = 1 ; final public static int ByCollideRadius = 2 ; public Image image; public int positionX; public int positionY; public int numFrames; public int currentFrame; public int[][] framesInfo;//本版本吧各个帧的尺寸存到数组中，而不是象1.0中等大 public boolean visible=true; public int DX; public int DY; public int collideX=0;//当两个角色交叉横向距离超过collideX时认为已经碰撞 public int collideY=0;//当两个角色交叉纵向距离超过collideY时认为已经碰撞 public int collideArea=0;//当两个角色互相入侵面积超过collideArea时认为已经碰撞（注意：这里的入侵面积!=交叉面积） public int collideRadius=0;//碰撞半径 public int state=0;
public MySprite(Image image,int numFrames) throws Exception { this.image = image; this.numFrames = numFrames; //set frameInfo framesInfo=new int[numFrames][4]; for (int i=0;i<numFrames;i++) { framesInfo[i][0]=i*image.getWidth()/numFrames;//左上角X坐标 framesInfo[i][1]=0;//左上角Y坐标 framesInfo[i][2]=image.getWidth()/numFrames;//本帧宽度 framesInfo[i][3]=image.getHeight();//本帧高度 } /////////////// this.currentFrame=0; } public void draw(Canvas theCanvas,Graphics g) { if (visible) { g.setClip(positionX, positionY, framesInfo[currentFrame][2], framesInfo[currentFrame][3]); g.drawImage(image, positionX - framesInfo[currentFrame][0], positionY-framesInfo[currentFrame][1],0); g.setClip(0, 0, theCanvas.getWidth(), theCanvas.getHeight()); } } public void step() { if (visible) { this.positionX += DX; this.positionY += DY; } } public boolean collidesWith(MySprite sprite) { return this.collidesWith(sprite,ByCollideArea); } public boolean collidesWith(MySprite sprite, int CheckType) { if (! visible || ! sprite.visible) { return false; } if (CheckType==ByCollideArea) { //当两个角色互相入侵面积超过collideArea时认为已经碰撞（注意：这里的入侵面积!=交叉面积） int inX=sprite.positionX+sprite.framesInfo[sprite.currentFrame][2]-this.positionX >this.positionX+this.framesInfo[currentFrame][2]-sprite.positionX ?this.positionX+this.framesInfo[currentFrame][2]-sprite.positionX :sprite.positionX+sprite.framesInfo[sprite.currentFrame][2]-this.positionX ; int inY=sprite.positionY+sprite.framesInfo[sprite.currentFrame][3]-this.positionY >this.positionY+this.framesInfo[currentFrame][3]-sprite.positionY ?this.positionY+this.framesInfo[currentFrame][3]-sprite.positionY :sprite.positionY+sprite.framesInfo[sprite.currentFrame][3]-this.positionY ; if (inX>0 && inY>0 && inX*inY>this.collideArea+sprite.collideArea) { return true; } else { return false; } } else if (CheckType==ByCollideXY) { if (sprite.positionX+sprite.framesInfo[sprite.currentFrame][2]-sprite.collideX>this.positionX+this.collideX && this.positionX+this.framesInfo[currentFrame][2]-this.collideX>sprite.positionX+sprite.collideX && sprite.positionY+sprite.framesInfo[sprite.currentFrame][3]-sprite.collideY>this.positionY+this.collideY && this.positionY+this.framesInfo[currentFrame][3]-this.collideY>sprite.positionY+sprite.collideY) { return true; } else { return false; } } else //if (CheckType==ByCollideRadius) { int inX=Math.abs(this.positionX+this.framesInfo[currentFrame][2]/2-sprite.positionX-(sprite.framesInfo[sprite.currentFrame][2]+1)/2); int inY=Math.abs(this.positionY+this.framesInfo[currentFrame][3]/2-sprite.positionY-(sprite.framesInfo[sprite.currentFrame][3]+1)/2); if (inX*inX+inY*inY<(collideRadius+sprite.collideRadius)*(sprite.collideRadius+sprite.collideRadius)) { return true; } else { return false; } } } public boolean collidesWith(Image image, int x, int y) { return this.collidesWith(image, x, y,ByCollideArea); }
public boolean collidesWith(Image image, int x, int y, int CheckType) { if (! visible) { return false; }
if (CheckType==ByCollideArea) { //当两个角色互相入侵面积超过collideArea时认为已经碰撞（注意：这里的入侵面积!=交叉面积） int inX=x+image.getWidth()-this.positionX >this.positionX+this.framesInfo[currentFrame][2]-x ?this.positionX+this.framesInfo[currentFrame][2]-x :x+image.getWidth()-this.positionX ; int inY=y+image.getHeight()-this.positionY >this.positionY+this.framesInfo[currentFrame][3]-y ?this.positionY+this.framesInfo[currentFrame][3]-y :y+image.getHeight()-this.positionY ; if (inX>0 && inY>0 && inX*inY>this.collideArea) { return true; } else { return false; } } else if (CheckType==ByCollideXY) { if (x+image.getWidth()>this.positionX && this.positionX+this.framesInfo[currentFrame][2]-this.collideX>x && y+image.getHeight()>this.positionY && this.positionY+this.framesInfo[currentFrame][3]-this.collideY>y) { return true; } else { return false; } } else //if (CheckType==ByCollideRadius) { int inX=Math.abs(this.positionX+this.framesInfo[currentFrame][2]/2-x-(image.getWidth()+1)/2); int inY=Math.abs(this.positionY+this.framesInfo[currentFrame][3]/2-y-(image.getHeight()+1)/2); if (inX*inX+inY*inY<collideRadius*collideRadius) { return true; } else { return false; } } }}
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