如何在Libgdx中旋转矩形？ [英] How can I rotate Rectangles in Libgdx?

问题描述

我将我的精灵旋转90度，我想对我的矩形做同样的事情，以便能够将它们用于碰撞，但是 rotate（）方法不可用矩形。

I rotated my sprite 90 degrees and I want to do the same with my rectangle to be able to use them for collision, but the rotate() method is not available on rectangles.

这就是我所做的：

treeSpr=new Sprite(new Texture(Gdx.files.internal("tree.png")));
        treeSpr.setPosition(250,700);
        treeSpr.rotate(90f); 

//Rectangle
 treeRect=new Rectangle(treeSpr.getX(),treeSpr.getHeight(),
                treeSpr.getWidth(),treeSpr.getHeight());

推荐答案

另一个答案基本上是正确的;但是，我在使用该方法定位多边形时遇到了一些问题。只是澄清一下：

The other answer is basically correct; however, I had some issues with the positioning of the polygons using that method. Just some clarification:

当使用Intersector进行碰撞检测时，LibGDX不支持旋转的矩形。如果需要旋转矩形，则应使用用于碰撞检测的多边形。

LibGDX does not support rotated Rectangles when using the Intersector for collision dectection. If you need rotated rectangles, you should use the Polygon for collision detection instead.

polygon = new Polygon(new float[]{0,0,bounds.width,0,bounds.width,bounds.height,0,bounds.height});

如果你要旋转它，别忘了设置Polygon的原点：

Don't forget to set the origin of the Polygon if you are going to rotate it:

polygon.setOrigin(bounds.width/2, bounds.height/2);

现在你可以旋转碰撞多边形：

Now you can rotate the collision polygon:

polygon.setRotation(degrees);

此外，在代码中的某处，您可能希望更新碰撞多边形的位置以匹配你的精灵：

Also, somewhere in your code, you will likely want to update the position of the collision polygon to match your sprite:

polygon.setPosition(x, y);

我们甚至可以在屏幕上绘制多边形（用于调试目的）：

We can even draw our polygon on screen (for debug purposes):

drawDebug(ShapeRenderer shapeRenderer) {
    shapeRenderer.begin(ShapeRenderer.ShapeType.Line);
    shapeRenderer.polygon(polygon.getTransformedVertices());
    shapeRenderer.end();
}

碰撞检测：

Intersector的overlapConvexPolygons（）：

boolean collision = Intersector.overlapConvexPolygons(polygon1, polygon2)

如其他答案所述，此方法仅适用于：

As mentioned in the other answer, this method only works if:

• 使用凸多边形，矩形为


• 执行多边形到多边形检查，例如：你不能混合矩形和
  多边形

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