--BRUSH Scene: Sphere of pencolor v1.0
--by Richard Fhager
--http://hem.fyristorg.com/dawnbringer/
-- Copyright 2010 Richard Fhager
--
-- This program is free software; you can redistribute it and/or
-- modify it under the terms of the GNU General Public License
-- as published by the Free Software Foundation; version 2
-- of the License. See <http://www.gnu.org/licenses/>
-- This script was adopted from Evalion, a Javascript codecrafting/imageprocessing project
--http://goto.glocalnet.net/richard_fhager/evalion/evalion.html
w, h = getbrushsize()
rp,gp,bp = getcolor(getforecolor())
for y = 0, h - 1, 1 do
for x = 0, w - 1, 1 do
-- Fractionalize image dimensions
ox = x / w;
oy = y / h;
-- Sphere
X = 0.5; Y = 0.5; Rd = 0.5
a = math.sqrt(math.max(0,Rd*Rd - ((X-ox)*(X-ox)+(Y-oy)*(Y-oy)))) * 1/Rd
r = rp * a
g = gp * a
b = bp * a
putbrushpixel(x, y, matchcolor(r,g,b));
end
end