startcanvas.java

Java游戏山洞历险源代码

package popo;


import java.util.Vector;
import java.io.*;
import java.io.IOException;
import javax.microedition.lcdui.*;
import java.util.Random;
import javax.microedition.rms.*;
import com.nokia.mid.ui.*;


//运行start画面，并且进行选择，如果选中start则调用canvas运行游戏，否则退出
class StartCanvas extends FullCanvas{
  Display display;
  MainCanvas mainCanvas;
  popoGame game;
  private Form GaugeForm;
  private Gauge gameGauge;
  private Alert alert;
  private final String GameName = "PopoName";//游戏名称
  private final String[ ] imageName = {"/hong00","/huang00","/lan00","/lv00","/zi00","/cheng00","/run"};
  /** Vector of images to display */
  private Vector images;
  private Vector mainImages;
  private int frameWidth, frameHeight;
  private int chooseHeight;//当前按钮的位置
  private int chooseStart,chooseExit; //start按钮的高度，Exit按钮的高度

  public StartCanvas(popoGame game)
  {
    frameWidth = getWidth();
    frameHeight = getHeight();
    chooseStart = frameHeight - 65;
    chooseExit = frameHeight - 40;
    chooseHeight = chooseStart;

    this.game = game;
    this.display = game.display;
    mainCanvas = new MainCanvas(this);
    alert = new Alert("Warning");
  }

  protected void keyPressed(int keyCode) {
    int chooseAction = getGameAction(keyCode);
      switch (chooseAction) {
        case UP:
          if(chooseHeight == chooseExit)
          {
            chooseHeight = chooseStart;
            repaint();
          }
          break;
        case DOWN:
           if(chooseHeight == chooseStart)
           {
             chooseHeight = chooseExit;
             repaint();
           }
          break;
        case FIRE:
          if(chooseHeight == chooseStart){
            StartGame();
          }
          if(chooseHeight == chooseExit){
            game.destroyApp(false);
            game.notifyDestroyed();
          }
          break;
        default:
          break;
      }
  }

  void reset() {
    images = null;
  }

  void setImages(Vector images) {
    this.images = images;
  }

  void StartGame() {
    if(mainImages == null)
    {
      mainImages = new Vector(5);
    try {

try {
  String name;
   // Try for a sequence of images.

    for (int i = 0; i<7; i++) {
      for(int j = 1; j<=3; j++){
        name = imageName[i] + j + ".png";
       mainImages.addElement(createImage(name));
      }
    }
    name = "/chooser.png";
    mainImages.addElement(createImage(name));

    //translate images to mainCanvas
    mainCanvas.setImages(mainImages);
    display.setCurrent(mainCanvas);

} catch (IOException io_ex) {
  mainImages = null;
  alert.setString("Images could not be loaded.");
  alert.setTimeout(Alert.FOREVER);
  display.setCurrent(alert);
}

} catch (OutOfMemoryError err) {
      mainImages = null;
      alert.setString("Not enough memory for all images.");
      alert.setTimeout(Alert.FOREVER);
      display.setCurrent(alert);

  }
    }
    else
    {
      display.setCurrent(mainCanvas);
    }

  }

  private Image createImage(String name) throws IOException {
     return Image.createImage(name);
  }

  protected void paint(Graphics g) {
    //填充底色
    g.setColor(0xffffff);//白色
    g.fillRect(0, 0, frameWidth, frameHeight);
    if (images != null ) {
    g.drawImage((Image)images.elementAt(0),//主界面
                       0, 0, Graphics.LEFT|Graphics.TOP);
    g.drawImage((Image)images.elementAt(1),//选择按钮
                       25, chooseHeight, Graphics.LEFT|Graphics.TOP);
    }
  }

  public void destroyApp(boolean unconditional) {
  }
}