[mion]

Thanks a lot for the feedback! My goal is to make a tool you would use to quickly prototype 2D games that involve physics (eg: Angry birds).

Hmmm I see, I'll make sure to change the commands' instructions.

Defaults would be cool, but not fixed right? What if you could click somewhere and the x,y gets pasted in the command box?

Joints come from Box2D (a famous physics engine), they should have fixed length but it's not 100% accurate. Ok cool, when I add the other joint types I'll improve the description!