mutableimage.java

J2ME 无线通信技术应用开发源代码

// 程序名MutableImage.java
// 测试可变图象
import javax.microedition.lcdui.*;
import java.util.Random;

public class MutableImage extends ImageItem {
  private Image image;
  private Graphics g;
  private Random colorRandom;
  private int w,h;

  MutableImage(){
    super(null,null,0x303,"Mutable Image");
    colorRandom = new Random(0x00FFFFFF);
    image = Image.createImage(80,70);
    g = image.getGraphics();//获取Graphics对象
    w = g.getClipWidth();
    h = g.getClipHeight();
    g.setColor(colorRandom.nextInt());
    g.fillRect(0,0,w,h);
    g.setColor(colorRandom.nextInt());
    g.fillRect(w/4,h/4,w/2,h/2);
    this.setImage(Image.createImage(image));
  } 
 
  public void change() {
    g.setColor(colorRandom.nextInt());//设置一个随机颜色
    g.fillRect(0,0,w,h);
    g.setColor(colorRandom.nextInt());//设置一个随机颜色
    g.fillRect(w/4,h/4,w/2,h/2);
    this.setImage(Image.createImage(image));
  }
}