transformpanel.java

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package transform;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.JPanel;

/**
 * <p>Title: Transform</p>
 * <p>Description: 应用Java 2D API实现几何图形的变换</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: 北京师范大学计算机系</p>
 * @author 张良博
 * @version 1.0
 */

public class TransformPanel extends JPanel {
  private Rectangle2D square;
  private AffineTransform t;
  public TransformPanel() {
    square = new Rectangle2D.Double(-50, -50, 100, 100);
    t = new AffineTransform();
    setRotate();
  }
  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D)g;
    g2.translate(getWidth() / 2, getHeight() / 2);
    g2.setPaint(Color.gray);
    g2.draw(square);
    g2.transform(t);
    g2.setPaint(Color.black);
    g2.draw(square);
  }
  public void setRotate(){//设置旋转变换
    t.setToRotation(Math.toRadians(30));
    repaint();
  }
  public void setTranslate(){//设置平移变换
    t.setToTranslation(20, 15);
    repaint();
  }
  public void setScale(){//设置缩放变换
    t.setToScale(2.0, 1.5);
    repaint();
  }
  public void setShear(){//设置修剪变换
    t.setToShear(-0.2, 0);
    repaint();
  }
}