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MySprite 2.0


/**

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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