Just a small test using the Minsky algorithm as a fade.
Z to switch between rectfill() and memcpy() methods.
X to toggle auto-size. If auto-size is off the cursors will resize the circle.
NB: The memcpy() method uses the sprite memory for ease; more thought will be required if used in a cart using this memory. The recfill() method is less cpu anyway, so...



There's a token-light version I prefer posted by @freds72 here:
https://twitter.com/FSouchu/status/1277996141913702400
It take a little more cpu but less tokens.
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