midp1eventgame_canvas.java

《J2ME无线移动游戏开发》一书的配套光盘

package ch04;

import javax.microedition.lcdui.*;

public class MIDP1EventGame_Canvas
    extends Canvas {

  //声明一个代表屏幕宽度的int型属性变量
  private int width;

  //声明一个代表屏幕高度的int型属性变量
  private int height;

  //声明一个代表按键信息的变量
  String text = "MIDP1.0游戏按键测试";

  MIDP1EventGame_Canvas() {
    width = getWidth();
    height = getHeight();
    repaint();
  }

  /*
   3.实现paint()方法
   */
  protected void paint(Graphics g) {
    g.setColor(0xffffff);
    g.fillRect(0, 0, width, height);
    g.setColor(0x000000);
    g.drawString(text, 0, height / 2, Graphics.LEFT | Graphics.TOP);
  }

  /*
   4.响应按键事件
   */
  protected void keyPressed(int keyCode) {
    int action = getGameAction(keyCode);
    switch (action) {
      case LEFT:
        text = "您点击了向左方向键←！";
        break;
      case RIGHT:
        text = "您点击了向右方向键→！";
        break;
      case UP:
        text = "您点击了向上方向键↑！";
        break;
      case DOWN:
        text = "您点击了向下方向键↓！";
        break;
      case FIRE:
        text = "您点击了发射键！";
        break;

    }
    repaint();
  }
}