[Easing with constant acceleration and upper bound on velocity (custom easing?)]

Thanks Carl! 

 

I have been reading these posts for some time, and as always, you are a wealth of info.

 

Thanks for the tip about checking the velocity.  I am already using the Seek() method several places to dissect that a tween is doing, for subsequent tweens and processing.  I had not thought about using it here, to determine when to break a tween into two pieces (acceleration, then linear). This may work, and is a great idea!

 

Also, I ran into the same thing with the Physics plugin, the terminal velocity.  Would it be easy to just hack up the physics plugin to rate limit it?

 

Thanks again!

--Kestal

[Easing with constant acceleration and upper bound on velocity (custom easing?)]

Hi,

 

For the purpose of distilling this problem to its principal components, let's say I have 2 object that are side by side, say at y=100 pixels.  I want both of those to fall down the screen, but to different destination y locations.  I want them both to accelerate (easeIn), at the same speed, even though their distance to tween is different.  Also I want to cap their final velocity, so they never fall faster than pixels/sec.

 

Here is an illustration:

 

(initial position)

Sprite1                                                      Sprite2 

    (fromX = 0, fromY = 0)                                 (fromX = 100, fromY = 0)

    (toX     = 0, toY     =  200)                            (toX      = 100, toY     = 400)   

 

                    (falling  -->       Sprite 1 and Sprite 2 have the EXACT same Y location as falling, since they are using the same custom easing IN function to control their acceleration and final velocity)

                    (falling)

                          ..

                          ..

                          ..

 

 

 

Sprite1 has stopped here)

Sprite1 (x=0, y=200)                               Sprite2 (is at the exact same Y locations because they are following the

                                                                             same easing IN  function, regardless of total distance to travel

 

 

 

 

 

 

                                                                       (Sprite2 continues to fall until it reaches it target location of y=400)

                                                                      Sprite2 (x = 100, y = 400)

 

 

 

Thanks,

--Kestal