How can I rotate Rectangles in Libgdx?

Question

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 rectang

Answer 1

Rotation

You could create a Polygon from the rectangle or from the sprite (supplying the vertices in order for the polygon constructor) and use it's rotate(float degrees) method:

treePoly = new Polygon(new float[] {
               treeRect.x, treeRect.y,
               treeRect.x, treeRect.y + treeRect.height,
               treeRect.x + treeRect.width, treeRect.y + treeRect.height,
               treeRect.x + treeRect.width, treeRect.y
           });

treePoly.rotate(45f);

Collision Detection

Collision checks then could be done via the Intersector class:

Intersector.overlapConvexPolygons(polygon1, polygon2)

Keep in mind though, this method only works if:

• you use convex polygons, which the rectangle is
• you do polygon to polygon checks, e.g.: you cannot mix rectangles and polygons