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84 lines
3.4 KiB
C++
84 lines
3.4 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2016 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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#ifndef __CONVEX_HULL_H__
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#define __CONVEX_HULL_H__
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#include <modules/globebrowsing/geometry/aabb.h>
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#include <vector>
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#include <stack>
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#include <memory>
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#include <glm/glm.hpp>
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// open space includes
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namespace openspace {
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using namespace glm;
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// Implementation based on
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// http://www.sanfoundry.com/cpp-program-implement-graham-scan-algorithm-find-convex-hull/
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typedef glm::vec2 Point2;
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class ConvexHull2 {
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public:
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ConvexHull2();
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static ConvexHull2 grahamScan_NOT_THREAD_SAFE(std::vector<Point2>& points, int yMinIndex = -1);
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const std::vector<Point2> points() const;
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bool intersects(const ConvexHull2& o) const;
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AABB1 projectedRegion(glm::vec2 direction) const;
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private:
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bool hasPerpendicularLineWhereProjectedPointsOverlap(const ConvexHull2& other) const;
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static int compare(const void *vp1, const void *vp2);
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static Point2 oneBelowTop(std::stack<Point2>&);
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static void swap(Point2& p1, Point2& p2);
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// returns 0 = colinear, 1 = clockwise, 2 = counterclockwise
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static int orientation(const Point2& p, const Point2& q, const Point2& r);
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static float dist(const Point2& p1, const Point2& p2);
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private:
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static Point2 p0;
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std::vector<Point2> _points;
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};
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} // namespace openspace
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#endif // __CONVEX_HULL_H__
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