如何将Rectangle添加到数组中?

时间:2017-12-22 03:06:53

标签: arrays libgdx collision-detection

我是libgdx中的新手,我有问题要在我的数组中添加一个矩形("两个")。添加并获取后我无法检测到碰撞。 我的代码如下:

...

public class MyGdxGame implements ApplicationListener
{
    Texture texture;
    SpriteBatch batch;
    Rectangle one, two;

    float x1=0,x2;
    float y1, y2;

    Array <Rectangle> array;

在Create()中:

        texture = new Texture(Gdx.files.internal("android.jpg"));
        batch = new SpriteBatch();

        x2 = Gdx.graphics.getWidth()-40;
        y1 = y2 = (Gdx.graphics.getHeight()/2)-15;

        one = new Rectangle();
        two = new Rectangle();

        one.set(x1, y1, 40, 30);
        two.set(x2, y2, 40, 30);

        array = new Array <Rectangle>();
        array.add(two);

在渲染器()中:

...
        batch.begin();
        batch.draw(texture, x1, y1, 40, 30);
        batch.draw(texture, x2, y2, 40, 30);

        try
        {
            Thread.sleep(10);

            x1 += 2;
            x2 -= 2;

            one.set(x1, y1, 40, 30);
            two.set(x2, y2, 40, 30);

这是问题,因为&#34;一个&#34;矩形没有检测到&#34;两个&#34;矩形:

if(one.overlaps(array.get(1)))
            {
                x1 = 0;
                x2 = Gdx.graphics.getWidth()-40;
            }
        }
        catch(Exception e){}

        batch.end();

有人可以帮帮我吗?

1 个答案:

答案 0 :(得分:0)

您只在数组中添加1个元素。

array.add(two);

要转到此对象,您应该使用:array.get(0);而不是array.get(1); 首先我建议使用 List ,因为您可能希望有多个矩形来检查与它们的碰撞:

List<Rectangle> myList = new ArrayList<>();
myList.add(two);
for(Rectangle rect : myList) {
    if(one.overlaps(rect)) {
        //...
    }
}