mirror of
https://github.com/OpenSpace/OpenSpace.git
synced 2026-04-22 19:29:04 -05:00
Alexander Bock
73 lines
3.4 KiB
C++
73 lines
3.4 KiB
C++
/*****************************************************************************************
|
|
* *
|
|
* OpenSpace *
|
|
* *
|
|
* Copyright (c) 2014-2016 *
|
|
* *
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
|
|
* software and associated documentation files (the "Software"), to deal in the Software *
|
|
* without restriction, including without limitation the rights to use, copy, modify, *
|
|
* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
|
|
* permit persons to whom the Software is furnished to do so, subject to the following *
|
|
* conditions: *
|
|
* *
|
|
* The above copyright notice and this permission notice shall be included in all copies *
|
|
* or substantial portions of the Software. *
|
|
* *
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
|
|
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
|
|
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
|
|
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
|
|
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
|
|
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
|
|
****************************************************************************************/
|
|
|
|
#ifndef __OPENSPACE_MODULE_GLOBEBROWSING___CONVEX_HULL___H__
|
|
#define __OPENSPACE_MODULE_GLOBEBROWSING___CONVEX_HULL___H__
|
|
|
|
#include <modules/globebrowsing/geometry/aabb.h>
|
|
|
|
#include <stack>
|
|
#include <vector>
|
|
|
|
#include <glm/glm.hpp>
|
|
|
|
namespace openspace {
|
|
namespace globebrowsing {
|
|
|
|
// Implementation based on
|
|
// http://www.sanfoundry.com/cpp-program-implement-graham-scan-algorithm-find-convex-hull/
|
|
|
|
class ConvexHull2 {
|
|
public:
|
|
static ConvexHull2 grahamScan_NOT_THREAD_SAFE(std::vector<glm::vec2>& points,
|
|
int yMinIndex = -1);
|
|
|
|
const std::vector<glm::vec2> points() const;
|
|
|
|
bool intersects(const ConvexHull2& o) const;
|
|
|
|
AABB1 projectedRegion(glm::vec2 direction) const;
|
|
|
|
private:
|
|
bool hasPerpendicularLineWhereProjectedPointsOverlap(const ConvexHull2& other) const;
|
|
|
|
static int compare(const void* vp1, const void* vp2);
|
|
|
|
static glm::vec2 oneBelowTop(std::stack<glm::vec2>&);
|
|
static void swap(glm::vec2& p1, glm::vec2& p2);
|
|
|
|
// returns 0 = colinear, 1 = clockwise, 2 = counterclockwise
|
|
static int orientation(const glm::vec2& p, const glm::vec2& q, const glm::vec2& r);
|
|
static float dist(const glm::vec2& p1, const glm::vec2& p2);
|
|
|
|
private:
|
|
static glm::vec2 p0;
|
|
std::vector<glm::vec2> _points;
|
|
};
|
|
|
|
} // namespace globebrowsing
|
|
} // namespace openspace
|
|
|
|
#endif // __OPENSPACE_MODULE_GLOBEBROWSING___CONVEX_HULL___H__
|