[squeakland] Animating Sinewave Distortion on Any Image

[Jeremy Landry]

Attached is a simple project which you can play with to create sinewave
distortions on any image.

A flap contains more info and more than just the pulled out values will
make significant changes to the effect.  While it's not ideal to use this
inside of a project, it is perfectly suitable for creating some
pre-rendered animation frames to use later that end up using infinitely
less CPU and and memory (since nothing is calculated in realtime if it's
just playing back an animation).

However, even as unoptimized as it is, it still runs at 15-30 FPS as it is
now on an intel Atom dual core ate 1.2Ghz (which effectively means it's
running at 600mhz on a RISC processor and no GPU assistance from what I
understand of the VM).

After all these years, this effect is still cool to look at and fun to
apply to various kinds of graphics to achieve interesting results when
combined.

For fun, you can change the MAKE SCANLINES script to make vertical slices
and change the demo script to affect Y origin instead of X origin.

Or if you're just lazy, rotate the entire holder playfield sideways and
that works too.  :p

Enjoy...this will be included along with samples of where this is useful
and how fast it runs after rendered (instead of running real time as a
prototype) in Etoys Club 1 to be coming out...um...when I can finish it!  :)

​
 RASTER FX 01.003.pr
<https://drive.google.com/file/d/1RFxllpBQnaxwyTcPl4fc2n4j4_5zgL7f/view?usp=drive_web>
​
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