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unity8/Greeter/Gradient.js
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1/*
2 * Copyright (C) 2013 Canonical, Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 3.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
17function threeColorByIndex(index, total, colors) {
18 var red, green, blue
19 var p = index / total
21 if (p < 0.5) {
22 red = (colors.main.r * p * 2.0) + colors.start.r * (0.5 - p) * 2.0;
23 green = (colors.main.g * p * 2.0) + colors.start.g * (0.5 - p) * 2.0;
24 blue = (colors.main.b * p * 2.0) + colors.start.b * (0.5 - p) * 2.0;
25 } else {
26 red = colors.end.r * (p - 0.5) * 2.0 + colors.main.r * (1.0 - p) * 2.0;
27 green = colors.end.g * (p - 0.5) * 2.0 + colors.main.g * (1.0 - p) * 2.0;
28 blue = colors.end.b * (p - 0.5) * 2.0 + colors.main.b * (1.0 - p) * 2.0;
29 }
31 return Qt.rgba(red, green, blue, 1)