produceimage.java

Java程序设计实用教程源代码 本书源代码按章分别放置在不同的文件夹中,所有程序均在JDK1.6环境下编译运行正常,除了第13章需要建立ODBC数据源之外,其他程序只要有Java运行环境即可直接运行

import javax.swing.*;
import java.awt.image.*;
import java.awt.*;
public class produceImage
    extends JFrame {
  private Image image;
  public produceImage() {
    super("生成图像MemoryImage");
    int w = 256, h = 256, index = 0;
    int[] pix = new int[w * h];
    for (int green = 0; green < h; green++)
      for (int red = 0; red < w; red++)
        pix[index++] = (red << 12) | green << 24 | green;
    image = createImage(new MemoryImageSource(w, h, pix, 0, w));
    setSize(260, 260);
  }

  public void paint(Graphics g) {
    super.paint(g);
    g.drawImage(image, 0, 0, this);
  }

  public static void main(String args[]) {
    produceImage app = new produceImage();
    app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    app.setVisible(true);

  }
}