Interpolate not based on static time?

ericzingeler

Ok, so I know the interpolate behavior is awesome, but what if you don't want to base the behavior on time. There's gotta be some math I can do to base it on something such as distance or speed. Anyone?

tatiang

It would help to know what you're trying to interpolate (e.g. self.position.X) and what effect you want it to have (e.g. speed up when closer to another actor, etc.). I think any sort of manual interpolation is going to require a timer or at the very least a loop (which also requires a timer).

ericzingeler

Sorry, should have been more specific. Let's say I want to move an Actor from Point A to Point B. The kicker is, Point B is dynamic (will change). I want to use interpolate, but have the movement based on a set speed instead of duration.

For example:

If Point B(1) = 100 and Point B(2) = 50, the time it takes to travel from A to Point B(2) should take half the time as traveling to Point B(1). Make sense?

tatiang

Perhaps I'm overlooking something, but wouldn't Change Velocity achieve that?

RThurman

Perhaps your example isn't saying what you meant. But at any velocity -- it always takes half the time to get to point B2 (50) when point B1 (100) is twice the distance.


Edit:
Maybe you want something that will move the position of the actor half the distance to the goal (on each update). Like this:

Constrain Attribute: self.Position.X To: self.Position.X +(( game.Mouse.Position.X - self.Position.X )*.25)
Constrain Attribute: self.Position.Y To: self.Position.Y +(( game.Mouse.Position.Y - self.Position.Y )*.25)

(Actually, this one moves it one quarter of the distance to the goal on each update. You can change the '.25' to match the speed you need.)


Edit #2
If constraining x & y position isn't useful. Here's a formula that uses velocity instead:

Constrain Attribute: self.Motion.Linear Velocity.X To: ((game.Mouse.Position.X-self.Position.X)*.9)*5
Constrain Attribute: self.Motion.Linear Velocity.Y To: ((game.Mouse.Position.Y-self.Position.Y)*.9)*5