import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.geom.*;
/**
* @author Hardneedl
*/
class RectTransform extends JFrame {
private static final Dimension minSize = new Dimension(300, 200);
private static final Dimension maxSize = new Dimension(1024, 768);
private static final Dimension preferredSize = new Dimension(600, 400);
public Dimension getMaximumSize() {return maxSize;}
public Dimension getMinimumSize() {return minSize;}
public Dimension getPreferredSize() {return preferredSize;}
public String getTitle() {return "Frame Title";}
private AffineTransform af = new AffineTransform();
private Stroke stroke = new BasicStroke(2.0f);
private Rectangle rct = new Rectangle(40,140,200,140);
private JComponent canvas = new JComponent(){
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.BLACK);
g.fillRect(0,0,getWidth(),getHeight());
Graphics2D g2d = (Graphics2D)g.create();
g2d.setColor(Color.YELLOW);
g2d.setTransform(af);
g2d.setStroke(stroke);
g2d.draw(rct);
g2d.dispose();
}
};
RectTransform() throws HeadlessException {
init();
doLay();
attachListeners();
}
private void init() {
}
private void doLay() {
Container container = getContentPane();
JPanel panel = new JPanel(new FlowLayout(FlowLayout.CENTER,30,5));
panel.add(new JButton( new AfAction("move", AffineTransform.getTranslateInstance(100,100)) ));
panel.add(new JButton( new AfAction("rotate", AffineTransform.getRotateInstance(Math.PI/3,40,120) ) ));
panel.add(new JButton( new AfAction("zoomIn", AffineTransform.getScaleInstance(2,2)) ));
panel.add(new JButton( new AfAction("ZoomOut", AffineTransform.getScaleInstance(.5d,.5d)) ));
panel.add(new JButton( new AfAction("Original", new AffineTransform()) ) );
container.add(panel,BorderLayout.NORTH);
container.add(canvas,BorderLayout.CENTER);
pack();
}
private void attachListeners() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private class AfAction extends AbstractAction {
private AffineTransform aff;
private AfAction(String n,AffineTransform af) {
super(n);
this.aff = af;
}
public void actionPerformed(ActionEvent e) {
af.setTransform(aff);
if(canvas.isVisible()) canvas.paintImmediately(0,0,getWidth(),getHeight());
}
}
public static void main(String[] args) {
new RectTransform().setVisible(true);
}
}
import java.awt.Graphics;
import java.awt.Color;
public class LX3_3 extends Applet {
public void paint(Graphics g) {
g.setColor(Color.red);//设置红颜色
g.drawOval(35,35,100,60);//画椭圆（圆心、宽和高）
g.fillOval(200,15,60,100);//画具有填充色的圆
g.setColor(Color.blue);//设置蓝颜色
g.drawRect(20,130,80,80);//画矩形
g.fillRect(120,130,80,80);//画具有填充色的矩形
g.drawRoundRect(220,130,80,80,20,20);//画圆角矩形
g.fillRoundRect(320,130,80,80,20,20);//画具有填充色的 圆角矩形
}
}
该程序是在Myeclipse的环境下运行的
在二维平面内，画长方形等都只需要改变点的坐标即可实现平移,旋转,缩放
上面还加入了颜色，可供参考
水平有限，但希望对你有帮助本回答被提问者采纳