dir_canvas.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch08;

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

public class Dir_Canvas
    extends GameCanvas
    implements CommandListener {

  //代表程序是否运行的状态
  boolean running;

  //存储构成动画的各图像帧
  Image img;

  //代表动画的精灵对象
  Sprite sp;

  //动画播放序列
  int fs[];

  //屏幕宽度
  int win_width = getWidth();

  //屏幕高度
  int win_height = getHeight();

  //每帧图像的宽度
  int img_width = 32;

  //每帧图像的高度
  int img_height = 48;
  Graphics g = getGraphics();
  //主MIDlet类实例
  Dir_MIDlet fm;

  /*
   3.构造器
   */
  public Dir_Canvas(Dir_MIDlet fm) {
    super(true);
    this.fm = fm;
    Command exitCommand = new Command("退出", Command.EXIT, 0);
    addCommand(exitCommand);
    setCommandListener(this);

    try {
      img = Image.createImage("/icons/cowboy/cowboy0.png");
    }
    catch (IOException e) {
      System.out.println(e.getMessage());
    }
    sp = new Sprite(img, img_width, img_height);
    int x = (win_width - img_width) / 2;
    int y = (win_height - img_height) / 2;
    sp.setPosition(x, y);
    render(g);
    //start();
  }

  /*
   7.实现绘制
   */
  private void render(Graphics g) {

    g.setColor(0x000000);
    g.fillRect(0, 0, win_width, win_height);

    /*
         sp.setFrame(0);
         sp.paint(g);
         sp.setTransform(Sprite.TRANS_NONE);
         sp.paint(g);

         sp.setFrame(0);
         sp.paint(g);
         sp.setTransform(Sprite.TRANS_ROT90);
         sp.paint(g);

         sp.setFrame(0);
         sp.paint(g);
         sp.setTransform(Sprite.TRANS_ROT180);
         sp.paint(g);

         sp.setFrame(0);
         sp.paint(g);
         sp.setTransform(Sprite.TRANS_ROT270);
         sp.paint(g);

         sp.setFrame(0);
         sp.paint(g);
         sp.setTransform(Sprite.TRANS_MIRROR);
         sp.paint(g);

         sp.setFrame(0);
         sp.paint(g);
         sp.setTransform(Sprite.TRANS_MIRROR_ROT90);
         sp.paint(g);

         sp.setFrame(0);
         sp.paint(g);
         sp.setTransform(Sprite.TRANS_MIRROR_ROT180);
         sp.paint(g);

         sp.setFrame(0);
         sp.paint(g);
         sp.setTransform(Sprite.TRANS_MIRROR_ROT270);
         sp.paint(g);


     */


    flushGraphics();
  }

  /*
   9.响应按钮事件
   */
  public void commandAction(Command c, Displayable s) {
    if (c.getCommandType() == Command.EXIT) {
      fm.quitApp();
    }
  }

}