使用Java开发一个大型街机动作闯关类游戏05图像仿射变换（平移和缩放操作）

package sprite;

import java.awt.geom.AffineTransform;


public class Transform {
	private double _x;
	private double _y;

	private AffineTransform _at;
	private AffineTransform _rat;
	
	private double _cx;
	private double _cy;

	public Transform(){
		_rat = new AffineTransform();
		_x = 0;
		_y = 0;
	}
	

	public void translate(double x,double y){
		_at = new AffineTransform();
		_at.translate(_cx,_cy);
		_at.translate(x, y);
		_at.translate(-_cx,-_cy);
		_rat.preConcatenate(_at);
		_x += x;
		_y += y;
	}
	

	public void scale(double xscl,double yscl){
		_rat.translate(_cx,_cy);
		_rat.scale(xscl,yscl);
		_rat.translate(-_cx,-_cy);
	}
	

	public double getX(){
		return _x+_cx;
	}
	

	public double getY(){
		return _y+_cy;
	}
	
	public AffineTransform getTransform(){
		return _rat;
	}
	
	public void setOrigin(int x, int y){
		_cx = x;
		_cy = y;
	}

}

package sprite;

import java.awt.*;

public class Sprite extends Transform{

	private Image _img;
	

	public Sprite(String path){
		super();
		_img = new Image(path);
		setOrigin(_img.getWidth()/2,_img.getHeight()/2);
		translate(0, 0);
	}


	public void show(Graphics2D g){
		g.drawImage(_img.getImage(), getTransform(), null);
	}
	

	public Image getImage(){
		return _img;
	}

}

sprite = new Sprite("res/dog/01.png");
sprite.scale(2,2);
sprite.translate(200,100);
sprite.translate(100,100);