Constrain rotation to touch

Fal01

Can anyone tell me how to constrain the angle of an actor (crossbow) to touch, in a sweeping motion like a windshield wiper?

Any help much appreciated.

RThurman

Something like this:

when mousedown
-- Constrain Attribute: self.rotation To: VectorToAngle(game.mouse.X - self.Position.X,game.mouse.Y - self.Position.Y)

Fal01

Thanks for your reply @RThurman,

It works, but I can only control it from the side.

Is there a way to control it from the middle? The actor is a crossbow facing the top of the screen and I need the touch position to be in the middle of the crossbow where the arrow is.

Thanks again for your help.

RThurman

Not sure what you are asking.

Does your crossbow (and arrow) graphic start at the '0' rotation? It should be facing directly to the right ----->
That is the '0' direction.

If it is not correctly oriented to '0' then the crossbow will not track the touch correctly.

Hope that is what you are asking about!

Fal01

@RThurman,

Sorry for the confusion, I am making a faux Z space crossbow facing the top of the screen.

RThurman

So ... when you import the crossbow image, is it facing right --->
The image needs to match the beginning orientation of the actor. It needs to face right.

First, you import the image, and then place the image into the actor prototype. (It will be facing to the right.) Then you drag an instance of the prototype onto the scene and rotate it to face upwards.

And then the equation will work properly.

Fal01

Oh, ok I'll try that.

Thank's a lot for your help!