comparison: src/geometry/linesegment.cpp
src/geometry/linesegment.cpp
- changeset 1251
- e75cc5bff076
- child 1326
- 69a90bd2dba2
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| 1250:e2755ccf3667 | 1251:e75cc5bff076 |
|---|---|
| 1 /* | |
| 2 * LDForge: LDraw parts authoring CAD | |
| 3 * Copyright (C) 2013 - 2017 Teemu Piippo | |
| 4 * | |
| 5 * This program is free software: you can redistribute it and/or modify | |
| 6 * it under the terms of the GNU General Public License as published by | |
| 7 * the Free Software Foundation, either version 3 of the License, or | |
| 8 * (at your option) any later version. | |
| 9 * | |
| 10 * This program is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 * GNU General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License | |
| 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 17 */ | |
| 18 | |
| 19 #include "linesegment.h" | |
| 20 | |
| 21 /* | |
| 22 * Returns the vertices of this line segment as a QPair. | |
| 23 */ | |
| 24 QPair<Vertex, Vertex> LineSegment::toPair() const | |
| 25 { | |
| 26 return {this->v_1, this->v_2}; | |
| 27 } | |
| 28 | |
| 29 /* | |
| 30 * Possibly swaps the vertices of given line segment so that equivalent line segments become equal. | |
| 31 */ | |
| 32 LineSegment normalized(const LineSegment& segment) | |
| 33 { | |
| 34 LineSegment result = segment; | |
| 35 | |
| 36 if (result.v_2 < result.v_1) | |
| 37 qSwap(result.v_1, result.v_2); | |
| 38 | |
| 39 return result; | |
| 40 } | |
| 41 | |
| 42 /* | |
| 43 * Overload of qHash for line segments. | |
| 44 */ | |
| 45 unsigned int qHash(const LineSegment& segment) | |
| 46 { | |
| 47 return qHash(normalized(segment).toPair()); | |
| 48 } | |
| 49 | |
| 50 /* | |
| 51 * Comparison operator definition to allow line segments to be used in QSets. | |
| 52 */ | |
| 53 bool operator<(const LineSegment& one, const LineSegment& other) | |
| 54 { | |
| 55 return normalized(one).toPair() < normalized(other).toPair(); | |
| 56 } | |
| 57 | |
| 58 /* | |
| 59 * Checks whether two line segments are equal. | |
| 60 */ | |
| 61 bool operator==(const LineSegment& one, const LineSegment& other) | |
| 62 { | |
| 63 return (one.v_1 == other.v_1 and one.v_2 == other.v_2) | |
| 64 or (one.v_2 == other.v_1 and one.v_1 == other.v_2); | |
| 65 } |
