drawpane.java

来自「这是各类实用工具的源码100例」· Java 代码 · 共 67 行

package jimagemovedemo;

import javax.swing.JPanel;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.*;
import java.awt.image.*;

class DrawPane extends JPanel implements MouseMotionListener {
  private int x,y;
  BufferedImage bimage;

  public DrawPane(){
    this.setBackground(Color.white);
    this.addMouseMotionListener(this);

    Image image = this.getToolkit().getImage(ClassLoader.getSystemResource("images/image.jpg"));
    MediaTracker mt = new MediaTracker(this);
    mt.addImage(image,1);

    try{
      mt.waitForAll();

    }catch(Exception err){
      err.printStackTrace();
    }
    if (image.getWidth(this) == -1){
      System.out.println("Could not get the image");
      System.exit(-1);
    }

    bimage = new BufferedImage(image.getWidth(this),image.getHeight(this),
                               BufferedImage.TYPE_INT_ARGB);

    Graphics2D g2D = bimage.createGraphics();
    g2D.drawImage(image,0,0,this);

  }

  public void paintComponent(Graphics g){

    super.paintComponent(g);

    Graphics2D g2D = (Graphics2D)g;
    g2D.drawImage(this.bimage,this.x,this.y,this);
  }







  public void mouseDragged(MouseEvent e) {
    /**@todo Implement this java.awt.event.MouseMotionListener method*/
    //throw new java.lang.UnsupportedOperationException("Method mouseDragged() not yet implemented.");
    this.x = e.getX();
    this.y = e.getY();
    repaint();


  }
  public void mouseMoved(MouseEvent e) {
    /**@todo Implement this java.awt.event.MouseMotionListener method*/
    //throw new java.lang.UnsupportedOperationException("Method mouseMoved() not yet implemented.");
  }
}