手把手一步一步教你使用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);