[4808] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[15973] | 3 | * Copyright (C) 2002-2018 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[4808] | 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System.Collections.Generic;
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| 23 | using System.Collections.ObjectModel;
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| 24 | using System.Drawing;
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| 25 |
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| 26 | namespace HeuristicLab.Common {
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| 27 | public static class ColorGradient {
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| 28 | private const int shades = 256;
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| 29 |
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| 30 | private static List<Color> colors = new List<Color>();
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| 31 | private static ReadOnlyCollection<Color> readOnlyColors;
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| 32 | public static IList<Color> Colors {
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| 33 | get {
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| 34 | if (readOnlyColors == null) readOnlyColors = colors.AsReadOnly();
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| 35 | return readOnlyColors;
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| 36 | }
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| 37 | }
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| 38 |
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| 39 | private static List<Color> grayscaledColors = new List<Color>();
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| 40 | private static ReadOnlyCollection<Color> readOnlyGrayScaledColors;
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| 41 | public static IList<Color> GrayscaledColors {
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| 42 | get {
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| 43 | if (readOnlyGrayScaledColors == null) readOnlyGrayScaledColors = grayscaledColors.AsReadOnly();
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| 44 | return readOnlyGrayScaledColors;
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| 45 | }
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| 46 | }
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| 47 |
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| 48 | static ColorGradient() {
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| 49 | int stepWidth = (256 * 4) / shades;
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| 50 | int currentValue;
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| 51 | int currentClass;
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| 52 | for (int i = 0; i < shades; i++) {
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| 53 | currentValue = (i * stepWidth) % 256;
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| 54 | currentClass = (i * stepWidth) / 256;
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| 55 | switch (currentClass) {
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| 56 | case 0: { colors.Add(Color.FromArgb(0, currentValue, 255)); break; } // blue -> cyan
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| 57 | case 1: { colors.Add(Color.FromArgb(0, 255, 255 - currentValue)); break; } // cyan -> green
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| 58 | case 2: { colors.Add(Color.FromArgb(currentValue, 255, 0)); break; } // green -> yellow
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| 59 | case 3: { colors.Add(Color.FromArgb(255, 255 - currentValue, 0)); break; } // yellow -> red
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| 60 | }
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| 61 | }
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| 62 | for (int i = 0; i < 256; i++)
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| 63 | grayscaledColors.Add(Color.FromArgb(255 - i, 255 - i, 255 - i)); // white -> black
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| 64 | }
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| 65 | }
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| 66 | }
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