Tweening (The Chickadee Game Toolkit)

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5.5.3 Tweening

- -

Tweening is the process of transitioning something from an initial -state to a final state over a pre-determined period of time. In other -words, tweening is a way to create animation. The tween -procedure can be used within any script like so: -

(define x 0)
-(script
-  ;; 0 to 100 in 60 ticks of the agenda.
-  (tween 60 0 100 (lambda (y) (set! x y))))
-

- -

Procedure: tween duration start end proc [#:step 1] [#:ease smoothstep] #:interpolate lerp]

Transition a value from start to end over duration, -sending each succesive value to proc. step controls the -amount of time between each update of the animation. -

To control how the animation goes from the initial to final state, an -“easing” procedure may be specified. By default, the -smoothstep easing is used, which is a more pleasing default -than a simplistic linear function. See Easings for a complete list -of available easing procedures. -

The interpolate procedure computes the values in between -start and end. By default, linear interpolation (“lerp” -for short) is used. -

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