panel1.java

Java灵感编程1-101之61-80

package transferobject;

import java.awt.*;
import javax.swing.*;
import java.awt.image.*;
import java.awt.geom.*;
import java.math.*;
/**
 * <p>Title: TransferObject  Demo</p>
 * <p>Description: This is a TransferObject Demo</p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: D6-125</p>
 * @author liujun
 * @version 1.0
 */

public class Panel1 extends JPanel {
  BorderLayout borderLayout1 = new BorderLayout();
  //声明两个自己的变量
  GeneralPath gPath1;//一个三角形
  AffineTransform AffineTransform1;//坐标变化用变量

  public Panel1() {
    try {
      jbInit();
    }
    catch(Exception ex) {
      ex.printStackTrace();
    }
  }
  void jbInit() throws Exception {
    this.setLayout(borderLayout1);
    //创建三角形
    gPath1 = new GeneralPath();
      gPath1.moveTo(0,-50);
      gPath1.lineTo(50,50);
      gPath1.lineTo(-50,50);
      gPath1.closePath();
      //创建坐标变换类
      AffineTransform1 = new AffineTransform();
      //设置初始变换值
      setRotate(45.0f);
  }
  protected void paintComponent(Graphics g) {
    /**@todo: Override this javax.swing.JComponent method*/
    super.paintComponent( g);
     Graphics2D g2 = (Graphics2D)g;
     //画一个没有变换的原始图形
      g2.translate(getWidth() / 2, getHeight() / 2);
      g2.setPaint(Color.blue);
      g2.draw(gPath1);
      //变换后的图形
      g2.transform(AffineTransform1);
      g2.setPaint(Color.red);
      g2.draw(gPath1);
  }
   public void setRotate(float x)
   {//旋转变换
    AffineTransform1.setToRotation(Math.toRadians(x));
    repaint();
   }

   public void setTranslateX(float x)
   {  //水平平移
      AffineTransform1.setToTranslation(x, 0);
      repaint();
   }

   public void setTranslateY(float y)
   {  //垂直平移
      AffineTransform1.setToTranslation(0, y);
      repaint();
   }

   public void setScale(float x)
   {  //放大和缩小变换
      AffineTransform1.setToScale(x, x);
      repaint();
   }

   public void setShear(float x)
   {  //倾斜变换
      AffineTransform1.setToShear(x, 0);
      repaint();
   }
}