follow mouse constrain to circle

SAMman

Hey guys, could anyone help with this? I want to orbit an actor around another actor but I want it to follow the mouse and not just be going around in orbit. I want's it to be constrained around a circle still but just be able to make it follow where the mouse is without leaving the orbit constraints. Any thoughts? Thanks.
SM

SAMman

is there anyone that can help? I really need some on this one.

RThurman

Try something like this:
constrain attribute: self.Position.X To: sceneX+orbitRadius*cos(vectorToAngle( game.Mouse.Position.X - sceneX , game.Mouse.Position.Y - sceneY ))
constrain attribute: self.Position.Y To: sceneY+orbitRadius*sin(vectorToAngle( game.Mouse.Position.X - sceneX , game.Mouse.Position.Y - sceneY ))

sceneX and sceneY is the center point (in scene coordinates) that you want to orbit around
orbitRadius is the distance from the center point

SAMman

it almost works. it's just doing a strange thing with making two images of the actor that is in orbit appear instead of one. but you have certainly helped. Any ideas how to fix this? Thanks again.

SAMman

it workd, thanks!

SAMman

I had my constraints mixed up.

SAMman

any thought on how to integrate tilt control in place of the mouse? That was my next step.

RThurman

Glad it worked!

Also, if you want the actor to point away from the center point (and towards the mouse) you could constrain the actor to:
vectorToAngle( game.sceneX - self.Position.X , game.sceneY - self.Position.Y )

As for tilt control, here is a way to determine "down" from the accelerometers. (The actor can point "down", whatever that means.)

(vectorToAngle( game.Accelerometer.X , game.Accelerometer.Y )+90)%360

The +90 is in case the device is oriented to landscape left. If in portrait, just remove the +90.

EDIT: Both of those would be used to constrain self.rotation

SAMman

that makes sense. thanks. I am still messing around with but something just isn't working quite right.