[REBOL] Re: Radial / Irregular Menu Implementation
From: rotenca:telvia:it at: 20-May-2003 17:43
Hi James
This code demonstrates the trick:
http://www.rebol.it/~romano/double-key.r
to adapt your code to double-key, you must convert our mask in a two colors
(black/white) mask, one color for the first image and one color for the second
image to merge.
You can draw your masks by scratch or calculate them with a rebol program like
this, which create a white/black mask:
for every color
;transform the color in white
m1: make image! layout [
origin 0x0
backcolor white
image mask effect compose [key (color)]
]
;luma key: not white pixels become black
newmask: make image! layout [
origin 0x0
backcolor black
image m1 effect [key 254]
]
now you can do:
double-key source1 source2 newmask black white ;or black white
This works only if the original mask does not contain pure black and pure
white points (also this can be esay changed with a key 0.0.0 -> 0.0.1 and
255.255.255 -> 255.255.254)
Obviously you should calculate masks only one time at the start of the
program.
---
Ciao
Romano
