读 Beginning Android Games 2nd Edition (十六) 游戏帮助

游戏帮助就是告诉用户游戏规则,游戏设计了三幅图片

从左到右分别是三个屏幕的画面,点击右下角的按钮跳到下一屏,最后返回主菜单

三个屏也定义了三个类来实现,分别是HelpScreen,HelpScreen2,HelpScreen3,内部实现几乎一样,只是draw的图片不同而已

看看HelpScreen的代码就可以了

package com.badlogic.androidgames.mrnom;

import java.util.List;

import com.badlogic.androidgames.framework.Game;
import com.badlogic.androidgames.framework.Graphics;
import com.badlogic.androidgames.framework.Input.TouchEvent;
import com.badlogic.androidgames.framework.Screen;

public class HelpScreen extends Screen {      
    public HelpScreen(Game game) {
        super(game);
    }

    @Override
    public void update(float deltaTime) {
        List<TouchEvent> touchEvents = game.getInput().getTouchEvents();
        game.getInput().getKeyEvents();
        
        int len = touchEvents.size();
        for(int i = 0; i < len; i++) {
            TouchEvent event = touchEvents.get(i);
            if(event.type == TouchEvent.TOUCH_UP) {
                if(event.x > 256 && event.y > 416 ) {
                    game.setScreen(new HelpScreen2(game));
                    if(Settings.soundEnabled)
                        Assets.click.play(1);
                    return;
                }
            }
        }
    }

    @Override
    public void present(float deltaTime) {
        Graphics g = game.getGraphics();      
        g.drawPixmap(Assets.background, 0, 0);
        g.drawPixmap(Assets.help1, 64, 100);
        g.drawPixmap(Assets.buttons, 256, 416, 0, 64, 64, 64);
    }

    @Override
    public void pause() {

    }

    @Override
    public void resume() {

    }

    @Override
    public void dispose() {

    }
}

在HelpScreen2中update方法中跳转的屏幕界面就变成了

                    game.setScreen(new HelpScreen3(game));