80eda990fe99001b1be1e2513c7decf1

《J2ME实用教程》 源文件下载 本书没有仅仅局限于J2ME单机游戏的开发

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

public class SimpleGameCanvas extends GameCanvas implements Runnable {
private boolean mTrucking;
private long mFrameDelay;
private int mX, mY;
private int mState;

public SimpleGameCanvas() {
    super(true);
    mX = getWidth() / 2;
    mY = getHeight() / 2;
    mState = 0;
    mFrameDelay = 20;
}
public void start() {
    mTrucking = true;
    Thread t = new Thread(this);
    t.start();
}
public void stop() { mTrucking = false; }
public void run() {
    Graphics g = getGraphics();
    
    while (mTrucking == true) {
      tick();
      input();
      render(g);
      try { Thread.sleep(mFrameDelay); }
      catch (InterruptedException ie) {}
    }
  }
private void tick() {
    mState = (mState + 1) % 20;
}
private void input() {
    int keyStates = getKeyStates();
    if ((keyStates & LEFT_PRESSED) != 0)
      mX = Math.max(0, mX - 1);
    if ((keyStates & RIGHT_PRESSED) != 0)
      mX = Math.min(getWidth(), mX + 1);
    if ((keyStates & UP_PRESSED) != 0)
      mY = Math.max(0, mY - 1);
    if ((keyStates & DOWN_PRESSED) != 0)
      mY = Math.min(getHeight(), mY + 1);
}
private void render(Graphics g) {System.out.println("ok");
    g.setColor(0xffffff);
    g.fillRect(0, 0, getWidth(), getHeight()); 
    g.setColor(0x0000ff);
    g.drawLine(mX, mY, mX - 10 + mState, mY - 10);
    g.drawLine(mX, mY, mX + 10, mY - 10 + mState);
    g.drawLine(mX, mY, mX + 10 - mState, mY + 10);
    g.drawLine(mX, mY, mX - 10, mY + 10 - mState);
    flushGraphics();
  }
}