capturecanvas.java

Programming java 2 micro edition on symbian os 一书中作者写的使用了MMAPI的小拼图游戏

/*
 * Copyright 2003, 2004 Symbian Ltd.
 * For License terms see http://www.symbian.com/developer/techlib/codelicense.html
 */

package picturepuzzle;
import javax.microedition.lcdui.*;

/**
 * A Canvas for rendering the output of the VideoPlayer. Also handles the user
 * interaction to take the snapshot.
 */
public class CaptureCanvas extends Canvas implements CommandListener{
    
    private Command captureCommand;
    private GameMIDlet midlet;
    
    /**
     * Creates the CaptureCanvas. Adds a "Capture" command.
     * @param midlet Facilitates call backs to the midlet.
     */
    public CaptureCanvas(GameMIDlet midlet){
        this.midlet = midlet;
        captureCommand = new Command("Capture", Command.SCREEN, 1);
        addCommand(captureCommand);
        setCommandListener(this);
    }
    
    /**
     * Paints a yellow background.
     * @param g
     */
    public void paint(Graphics g) {
        g.setColor(0x00FFFF00); // yellow
        g.fillRect(0, 0, getWidth(), getHeight());
    }
    
    /**
     * Resonds to the "Capture" command and takes the photo.
     * @param command
     * @param displayable
     */
    public void commandAction(Command command , Displayable displayable) {
        if(command == captureCommand){
            midlet.takePhoto();
        }
    }
    
    /**
     * Responds to the Joystick being pressed and takes the photo.
     * @param keyCode Indicates the key that was pressed.
     */
    public void keyPressed(int keyCode) {
        int key = getGameAction(keyCode);
        if (key == Canvas.FIRE) {
            midlet.takePhoto();
        }
    }
}