rgbdata_canvas.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch06;

import java.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;

public class rgbData_Canvas
    extends GameCanvas {

  //获取当前绘制上下文
  Graphics g = getGraphics();

  //变量w和h为模拟器的当前屏幕宽度和高度
  int w = getWidth();
  int h = getHeight();

  public rgbData_Canvas() throws IOException {
    //支持按键事件
    super(false);
  }

  //启动绘制
  public void start() {
    render(g);
  }

  //实现具体绘制
  void render(Graphics g) {
    /*
     3.装载图片
     */
    try {
      Image im = Image.createImage("/icons/background/boy01.png");
      g.drawImage(im, 0, 0, Graphics.LEFT | Graphics.TOP);

      //绘制区域坐标
      int x = 0, y = 0;
      //绘制区域宽度和高度
      int width = w / 3, height = h / 3;

      // 存储绘制区域绘制象素数据数组
      int rgbData[] = new int[width * height];
      im.getRGB(rgbData, 0, width, 0, 0, width, height);
      g.drawRGB(rgbData, 0, width, width, height, width, height, false);
      g.drawRGB(rgbData, width - width / 2, width / 2, x, y, width, height, false);

    }
    catch (Exception e) {
      System.out.println(e.toString());
    }

    /*
     7.输出图像
     */
    flushGraphics();
  }
}