作者：未知 来源：月光软件站 加入时间：2005-2-28　月光软件站

感觉MIDP2中的Sprite类很好用，而目前开发手机程序还是MIDP1为主流，所以做此类，用起来还是比较方便的，呵呵
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package theman;

/**
* <p>Title: </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 {
private Image image;
private int positionX;
private int positionY;
private int frameWidth;
private int frameHeight;
private int numFrames;
private int currentFrame;
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 MySprite(Image image, int frameWidth, int frameHeight, int numFrames) throws Exception {
this.image = image;
this.frameWidth = frameWidth;
this.frameHeight = frameHeight;
this.numFrames = numFrames;
this.currentFrame=0;
}
public int getX() {
return this.positionX;
}
public void setX(int positionX) {
this.positionX = positionX;
}
public int getY() {
return this.positionY;
}
public int getFrameWidth()
{
return this.frameWidth;
}
public int getFrameHeight()
{
return this.frameHeight;
}
public void setY(int positionY) {
this.positionY = positionY;
}
public void setCurrentFrame(int current) {
this.currentFrame = current;
}
public void draw(Graphics g,MainCanvas theCanvas)
{
if (visible)
{
g.clipRect(getX(), getY(), frameWidth, frameHeight);
g.drawImage(image, getX() - currentFrame * frameWidth, getY(),
g.TOP | g.LEFT);
g.setClip(0, 0, theCanvas.getWidth(), theCanvas.getHeight());
}
}
public void step()
{
this.positionX+=DX;
this.positionY+=DY;
}
public boolean collidesWith(MySprite sprite)
{
return this.collidesWith(sprite,false);
}
public boolean collidesWith(MySprite sprite, boolean CheckType)
{
if (! visible || ! sprite.visible)
{
return false;
}
if (CheckType)
{
//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.getX()+sprite.frameWidth-this.getX()
>this.getX()+this.frameWidth-sprite.getX()
?this.getX()+this.frameWidth-sprite.getX()
:sprite.getX()+sprite.frameWidth-this.getX()
;
int inY=sprite.getY()+sprite.frameHeight-this.getY()
>this.getY()+this.frameHeight-sprite.getY()
?this.getY()+this.frameHeight-sprite.getY()
:sprite.getY()+sprite.frameHeight-this.getY()
;
if (inX>0 && inY>0 && inX*inY>this.collideArea+sprite.collideArea)
{
return true;
}
else
{
return false;
}
}
else
{
if (sprite.getX()+sprite.frameWidth-sprite.collideX>this.getX()
&& this.getX()+this.frameWidth-this.collideX>sprite.getX()
&& sprite.getY()+sprite.frameHeight-sprite.collideY>this.getY()
&& this.getY()+this.frameHeight-this.collideY>sprite.getY())
{
return true;
}
else
{
return false;
}
}
}
public boolean collidesWith(Image image, int x, int y)
{
return this.collidesWith(image, x, y,false);
}

public boolean collidesWith(Image image, int x, int y, boolean CheckType)
{
if (! visible)
{
return false;
}

if (CheckType)
{
//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.getX()
>this.getX()+this.frameWidth-x
?this.getX()+this.frameWidth-x
:x+image.getWidth()-this.getX()
;
int inY=y+image.getHeight()-this.getY()
>this.getY()+this.frameHeight-y
?this.getY()+this.frameHeight-y
:y+image.getHeight()-this.getY()
;
if (inX>0 && inY>0 && inX*inY>this.collideArea)
{
return true;
}
else
{
return false;
}
}
else
{
if (x+image.getWidth()>this.getX()
&& this.getX()+this.frameWidth-this.collideX>x
&& y+image.getHeight()>this.getY()
&& this.getY()+this.frameHeight-this.collideY>y)
{
return true;
}
else
{
return false;
}
}
}
}

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