I want to fire a cannon object with the mouse using a vertical line behind it, probs with vect2angle

QuestionMan

How would I set up the formula to have my mouse fire my cannon from behind the cannon (not in front)?

RThurman

Its not a complete answer, but for starters you can replace the "Rotate to Position" behavior (in the cannon actor) with a "Rotate to Angle" behavior. The formula for the angle would be:
vectorToAngle( self.Position.X - game.Mouse.Position.X , self.Position.Y - game.Mouse.Position.Y )

QuestionMan

Ya RThurman I've been doing that for now(works in front but not in back) but I obviously need some tricky math to do it properly.

RThurman

Ya RThurman I've been doing that for now(works in front but not in back) but I obviously need some tricky math to do it properly.

@QuestionMan
The trick is to reverse the subtractions. Instead of:
vectorToAngle( game.Mouse.Position.X - self.Position.X , game.Mouse.Position.Y - self.Position.Y )
you would use:
vectorToAngle( self.Position.X - game.Mouse.Position.X , self.Position.Y - game.Mouse.Position.Y )

QuestionMan

perhaps, except theres more to it than that because the placement of the mouse/finger is to the far left of the image, so angles have to be involved

RThurman

Perhaps.... but don't you think its at least worth trying before you succumb to the lure of "tricky math".

It will take less than a minute to modify and test the cannon template. Try it! You might like it!