java - 如何让 Sprite 跳起来并返回到原始位置 GDXLib

Question

我对编程很陌生，所以请耐心等待......

我正在制作一个基本的 2d android 游戏。我试图简单地让一个 Sprite 在空中跳跃一下，然后降落到它最初开始的地方。我想要跳跃的 Sprite 是“ball2”。这是到目前为止我的代码(基本上只是在正确的位置添加了纹理和 Sprite 来开始跳跃，但没有做任何其他事情)。

感谢任何帮助。

public class MyGdxGame extends ApplicationAdapter {
SpriteBatch batch;
Texture background;
Texture ball;
Texture spike1;
Texture spike2;


@Override
public void create () {
    batch = new SpriteBatch();
    background = new Texture("gamebackground.png");

    ball = new Texture("ball2.png");
    ball.setFilter(Texture.TextureFilter.Nearest, Texture.TextureFilter.Nearest);

    spike1 = new Texture("spike1.png");
    spike1.setFilter(Texture.TextureFilter.Nearest, Texture.TextureFilter.Nearest);
    spike2 = new Texture("spike2.png");

}

@Override
public void render () {

    batch.begin();
    float scaleFactor = 2.0f;
    batch.draw(background, 0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
    batch.draw(ball, 80, 145, ball.getWidth() * scaleFactor, ball.getHeight() * scaleFactor);
    batch.end();

}

Answer 1

@Override
public void render () {

    batch.begin();
    float scaleFactor = 2.0f;
    batch.draw(background, 0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
    batch.draw(ball, 80, 145, ball.getWidth() * scaleFactor, ball.getHeight() * scaleFactor);
    batch.end();

    Gdx.input.setInputProcessor(new InputAdapter () {
            @Override
               public boolean keyDown (int keycode) {
                if(keycode==Keys.UP)
                {
                   ball.setHeight(ball.getHeight()+50);
                }
                return true;
               }  
    }


}

然后你需要添加计时器向下或者你可以添加向下按钮。不确定顶部是否也有尖刺。我不知道它应该是什么样子。