panel1.java

java程序3.4.1--图像操作样板（打开图像） 用JAVA打开图象

package openimage;

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class Panel1
    extends JPanel {
  BorderLayout borderLayout1 = new BorderLayout();
  BufferedImage image; //定义缓冲图像类的变量，用于显示图像

  public Panel1() {
    try {
      jbInit();
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  void jbInit() throws Exception {
    this.setLayout(borderLayout1);
  }

  public void showImage(String imagename) {
    Image image1 = Toolkit.getDefaultToolkit().getImage(imagename); //调用图像
    MediaTracker tracker = new MediaTracker(this);
    tracker.addImage(image1, 0);
    try {
      tracker.waitForID(0);
    }
    catch (InterruptedException e) {}
    image = new BufferedImage(image1.getWidth(null),
                              image1.getHeight(null),
                              BufferedImage.TYPE_INT_RGB); //创建缓冲图像
    Graphics2D g2 = image.createGraphics();
    g2.drawImage(image1, 0, 0, null); //绘制图像
  }

  protected void paintComponent(Graphics g) { //重载paintComponent方法
    /**@todo Override this javax.swing.JComponent method*/
    super.paintComponent(g);
    if (image != null) {
      g.drawImage(image, 0, 0, null);
    }
  }

}