Java2游戏编程读书笔记(10－1)中的Actor2D类的默认构造方法中写漏几句代码(现已更新，错误已被更正)，在此向广大读者致歉。给你们带来了不便请原谅。
你可以重新复制(10－1)中的Actor2D类(现已修改)，或者将下面的代码复制并替换Actor2D类的代码(漏写代码用红色标出)：
import java.awt.*;import java.awt.geom.*;import java.util.*;
//这个类封装了移动和绘制一个2-D游戏对象所需要的一般信息public abstract class Actor2D extends Object implements Moveable{//一个actor具有的一般状态public final int STATE_ALIVE=1;public final int STATE_DYING=2;public final int STATE_DEAD=4;//这个actor的当前状态protected int state;//所属的角色组protected ActorGroup2D group;//actor位置，速度和旋转，又及缓存的变换protected Vector2D pos;protected Vector2D vel;protected double rotation;protected AffineTransform xform;protected final double TWO_PI=2*Math.PI;//冲突检测用的边界矩形protected Rectangle2D bounds;//和这个actor有冲突的actor列表protected LinkedList collisionList;//宽和高protected int frameWidth;protected int frameHeight;//指向当前动画条的引用protected AnimationStrip currAnimation;//播放下一帧之前需要等待的帧数和一个帧计数器protected int animWait;protected int animCount;//创建一个属于给定ActorGroup的Actor2D对象public Actor2D(ActorGroup2D grp){group=grp;bounds=new Rectangle2D.Double();collisionList=new LinkedList();state=0;pos=new Vector2D.Double();vel=new Vector2D.Double();rotation=0;xform=new AffineTransform();currAnimation=null;animWait=0;animCount=0;frameWidth=0;frameHeight=0;}//每隔animWait帧，移动一下actorpublic void animate(){if(currAnimation!=null){if(++animCount>=animWait){currAnimation.getNextFrame();animCount=0;}}}//使用它自的变换来绘制actorpublic void paint(Graphics2D g2d){if(currAnimation!=null){g2d.drawImage(currAnimation.getCurrFrame(),xform,AnimationStrip.observer);}}//在(x,y)坐标处绘制actorpublic void paint(Graphics2D g2d,double x,double y){if(currAnimation!=null){g2d.drawImage(currAnimation.getCurrFrame(),AffineTransform.getTranslateInstance(x,y),AnimationStrip.observer);}}//简单边界盒，判断actor是否和传入的actor冲突public boolean intersects(Actor2D other){return bounds.intersects(other.getBounds());}//根据当前的x和y位置更新边界盒public void updateBounds(){//确保知道actor的正确的宽度和高度if(frameWidth<=0&&currAnimation!=null){frameWidth=currAnimation.getFrameWidth();}if(frameHeight<=0&&currAnimation!=null){frameHeight=currAnimation.getFrameHeight();}bounds.setRect(pos.getX(),pos.getY(),frameWidth,frameHeight);}//确保actor的边界没有超出actor组所限定的边界public void checkBounds(){if(group==null){return;}if(bounds.getX()<group.MIN_X_POS){pos.setX(group.MIN_X_POS);}else if(bounds.getX()+frameWidth>group.MAX_X_POS){pos.setX(group.MAX_X_POS-frameWidth);}if(bounds.getY()<group.MIN_Y_POS){pos.setY(group.MIN_Y_POS);}else if(bounds.getY()+frameHeight>group.MAX_Y_POS){pos.setY(group.MAX_Y_POS-frameHeight);}}//返回一个描述这个actor的字符串public String toString(){return super.toString();}//把传入的值和当前的属性值进行位或操作public final void setState(int attr){state|=attr;}//使用位与或者非重新设置属性public final void resetState(int attr){state&=~attr;}public final int getState(){return state;}public final void clearState(){state=0;}//判断所传入的状态属性是否被actor的状态属性所包含public final boolean hasState(int attr){return ((state & attr)!=0);}//actor的速度，位置和旋转的访问方法public final void setX(double px){pos.setX(px);}public final void setY(double py){pos.setY(py);}public final double getX(){return pos.getX();}public final double getY(){return pos.getY();}public final void setPos(int x,int y){pos.setX(x);pos.setY(y);}public final void setPos(double x,double y){pos.setX(x);pos.setY(y);}public final void setPos(Vector2D v){pos.setX(v.getX());pos.setY(v.getY());}public final Vector2D getPos(){return pos;}public final void setRot(double theta){rotation=theta;}public final double getRot(){return rotation;}public final void rotate(double theta){rotation+=theta;while(rotation>TWO_PI){rotation-=TWO_PI;}while(rotation<-TWO_PI){rotation+=TWO_PI;}}public final void setVel(int x,int y){vel.setX(x);vel.setY(y);}public final void setVel(Vector2D v){vel.setX(v.getX());vel.setY(v.getY());}public final Vector2D getVel(){return vel;}public final void moveBy(double x,double y){pos.translate(x,y);}public final void moveBy(int x,int y){pos.translate(x,y);}public final void moveBy(Vector2D v){pos.translate(v);}public final void accelerate(double ax,double ay){vel.setX(vel.getX()+ax);vel.setY(vel.getY()+ay);}public int getWidth(){return frameWidth;}public int getHeight(){return frameHeight;}//从Moveable接口所继承的方法public Rectangle2D getBounds(){return bounds;}//判断一个Moveable对象是否和这个对象冲突public boolean collidesWith(Moveable other){return (bounds.contains(other.getBounds())||bounds.intersects(other.getBounds()));}//在冲突列表中添加一个冲突对象public void addCollision(Moveable other){if(collisionList==null){collisionList=new LinkedList();collisionList.add(other);return;}if(!collisionList.contains(other)){collisionList.add(other);}}//处理与冲突列表中对象之间冲突的stub方法//这个方法留空，但并未声明为抽象public void processCollisions(){}//更新对象的位置和边界盒，移动它，然后更新变换public void update(){pos.translate(vel);updateBounds();checkBounds();animate();//子类如果要覆盖这个方法，必须要求变换是以原点为中心的//而不是位置以原点为中心if(rotation !=0){xform.setToIdentity();xform.translate(pos.getX()+frameWidth/2,pos.getY()+frameHeight/2);xform.rotate(rotation);xform.translate(-frameWidth/2,-frameHeight/2);}else{xform.setToTranslation(pos.getX(),pos.getY());}}}//Actor2D
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