如何检测三角位图碰撞Android？

Question

I'm making an Android game and I'm having some problems with bitmap collision detection. The problem is that one of the bitmaps is a triangle and the second one is a rectangle. I don't know how to detect collision between them because now I use this code:

if(policeY<((canvas.getHeight()/20)+eye.getHeight()) && (policeY+police.getHeight())>(canvas.getHeight()/20)){
            if((policeX+police.getWidth())>triangleLeft && policeX<(triangleLeft+eye.getWidth())){
                //collision
                play = false;
            }else if((policeX+police.getWidth())<triangleLeft && policeX>(triangleLeft+eye.getWidth())){
                //collision
                play = false;
            }

        }

However, this code handles both of them as rectangles and this causes collision even when triangle isn't even touching rectangle.

Like in this picture the circled area is considered as a collision

Answer 1

I'd set up the problem as an intersection problem. Define the edges of the triangles as lines then use the line-line intersection formula with the edges of the rectangle. Then check whether this point is on the edge of the rectangle or if it is outside the rectangle.