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Gradient.js
/*
* Copyright (C) 2013 Canonical Ltd.
*
* 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 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
function threeColorByIndex(index, total, colors) {
var red, green, blue;
var p = 0.0;
if(total > 0) {
p = index / total;
}
if (p < 0.5) {
red = (colors.main.r * p * 2.0) + colors.start.r * (0.5 - p) * 2.0;
green = (colors.main.g * p * 2.0) + colors.start.g * (0.5 - p) * 2.0;
blue = (colors.main.b * p * 2.0) + colors.start.b * (0.5 - p) * 2.0;
} else {
red = colors.end.r * (p - 0.5) * 2.0 + colors.main.r * (1.0 - p) * 2.0;
green = colors.end.g * (p - 0.5) * 2.0 + colors.main.g * (1.0 - p) * 2.0;
blue = colors.end.b * (p - 0.5) * 2.0 + colors.main.b * (1.0 - p) * 2.0;
}
return Qt.rgba(red, green, blue, 1);
}