Hello forum! So I wrote a short program to help with setting sprite shapes using SetSpriteShapePolygon(). The auto generate shape feature is slow so why not have the shape pre made with code. It's a lot faster and way more accurate. With this program, you will be able to create shapes in a visual manner, similar to image editing. Once you've got it perfect, you can save the data to file in code format and then copy and past it directly into your project with minimal changes.
I thought I would share it with everyone. Hope it helps.
Edit 07/09/2018: Fixed auto loading of images.
Edit 07/17/2018:
-Changed the app name from "SetSpriteShapes" to "AGK Sprite Shape Tool".
-Added the ability to open file explorer to write path by click the write path text at the top of the screen.
-Added guides.
-Various bug fixes.