src/colors.cpp

Sun, 02 Feb 2020 00:50:57 +0200

author
Teemu Piippo <teemu@hecknology.net>
date
Sun, 02 Feb 2020 00:50:57 +0200
changeset 43
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parent 35
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child 94
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permissions
-rw-r--r--

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1 /*
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2 * LDForge: LDraw parts authoring CAD
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3 * Copyright (C) 2013 - 2020 Teemu Piippo
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4 *
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5 * This program is free software: you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation, either version 3 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18
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19 #include "colors.h"
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20
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21 const ldraw::ColorTable::ColorDefinition ldraw::ColorTable::unknownColor{{}, {}, "Unknown"};
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22
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23 void ldraw::ColorTable::clear()
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24 {
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25 definitions = {};
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26 }
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27
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28 Result ldraw::ColorTable::load(QIODevice& device, QTextStream& errors)
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29 {
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30 this->clear();
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31 if (device.isReadable())
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32 {
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33 QTextStream stream{&device};
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34 QString line;
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35 while (stream.readLineInto(&line))
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36 {
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37 this->loadColorFromString(line);
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38 }
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39 return Success;
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40 }
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41 else
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42 {
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43 errors << "could not read colors";
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44 return Failure;
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45 }
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46 }
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47
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48 const ldraw::ColorTable::ColorDefinition& ldraw::ColorTable::operator[](Color color) const
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49 {
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50 auto it = this->definitions.find(color.index);
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51 if (it != this->definitions.end())
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52 {
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53 return *it;
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54 }
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55 else
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56 {
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57 return unknownColor;
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58 }
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59 }
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60
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61 void ldraw::ColorTable::loadColorFromString(const QString& string)
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62 {
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63 const QRegExp pattern{
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64 R"(^\s*0 \!COLOUR\s+([^\s]+)\s+)"_q +
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65 R"(CODE\s+(\d+)\s+)"_q +
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66 R"(VALUE\s+(\#[0-9a-fA-F]{3,6})\s+)"_q +
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67 R"(EDGE\s+(\#[0-9a-fA-F]{3,6}))"_q +
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68 R"((?:\s+ALPHA\s+(\d+))?)"_q
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69 };
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70 if (pattern.indexIn(string) != -1)
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71 {
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72 const int code = pattern.cap(2).toInt();
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73 ColorDefinition& definition = definitions[code];
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74 definition = {}; // in case there's an existing definition
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75 definition.name = pattern.cap(1);
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76 definition.faceColor = pattern.cap(3);
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77 definition.edgeColor = pattern.cap(4);
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78 if (not pattern.cap(5).isEmpty())
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79 {
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80 const int alpha = pattern.cap(5).toInt();
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81 definition.faceColor.setAlpha(alpha);
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82 }
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83 }
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84 }
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85
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86 /*
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87 * Calculates the luma-value for the given color.
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88 * c.f. https://en.wikipedia.org/wiki/Luma_(video)
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89 */
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90 double luma(const QColor& color)
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91 {
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92 return 0.2126 * color.redF() + 0.7152 * color.greenF() + 0.0722 * color.blueF();
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93 }

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