How to detect drag speed?

creativeapps

How do I detect drag right to left counts. For example If I drag slowley its display low counts if I drag fast its display higher counts. Is there any demo sample for that?

RP

I have not seen a demo but there are old discussions about the topic.

http://forums.gamesalad.com/discussion/19481/limit-speed-of-drag

http://forums.gamesalad.com/discussion/45856/getting-the-dragging-speed

creativeapps

@RP Thanks

RThurman

Speed = distance/time

To get the speed of the mouse.x (for instance) at the fastest frame-rate of the device you could make three (real) attributes 'currentSpeed', 'oldTime' and 'oldMouseX" then use the following three constrain behaviors:

Constrain Attribute [self.currentSpeed] To: [( game.Mouse.Position.X - self.oldMouseX )/( self.Time - self.oldTime )]
Constrain Attribute [self.oldTime] To: [self.Time]
Constrain Attribute [self.oldMouseX] To: [game.Mouse.Position.X]

There is just (barely) enough processing time between iterations so the time value is different (about a 60th of a second at the fastest).

RThurman

I've been messing with this idea a bit more and realized that @ericzingeler's low pass filter would work nicely to smooth out the swipe speed. Here is a way to do it that is fiendishly accurate!

When mouse button is down
-- Timer - every 0 seconds
---- Change Attribute: [self.SwipeSpeed] To [( self.SwipeSpeed *.96)+(( game.Mouse.Position.X - self.oldX )/( self.Time - self.oldTime )*.04)]
---- Change Attribute [self.oldTime] To: [self.Time]
---- Change Attribute [self.oldMouseX] To: [game.Mouse.Position.X]

creativeapps

@RThurman Thanks Do you think that gs can detect full speed accurately?

Socks

I've been messing with this idea a bit more and realized that @ericzingeler's low pass filter would work nicely to smooth out the swipe speed. Here is a way to do it that is fiendishly accurate!

When mouse button is down
-- Timer - every 0 seconds
---- Change Attribute: [self.SwipeSpeed] To [( self.SwipeSpeed *.96)+(( game.Mouse.Position.X - self.oldX )/( self.Time - self.oldTime )*.04)]
---- Change Attribute [self.oldTime] To: [self.Time]
---- Change Attribute [self.oldMouseX] To: [game.Mouse.Position.X]

@RThurman

Just spotted this, really good stuff !