CGI/exercise4/include/LineSegment.h

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2018-09-06 12:35:43 +00:00
// This source code is property of the Computer Graphics and Visualization
// chair of the TU Dresden. Do not distribute!
// Copyright (C) CGV TU Dresden - All Rights Reserved
#pragma once
#include "Box.h"
#include "GridUtils.h"
#include <util/OpenMeshUtils.h>
/*
a 3d line segment primitive which can be used with the AABBTree and the HashGrid data structure
*/
class LineSegment
{
//internal storage of start point of line segment
Eigen::Vector3f v0;
//internal storage of end point of line segment
Eigen::Vector3f v1;
//internal storage for an edge handle
//this edge handle can be used to optionally identify the edge in a halfedge mesh data structure instance
OpenMesh::EdgeHandle h;
public:
//default constructor
LineSegment();
//constructs a line segment by the two end points v0, v1 without using the edge handle
LineSegment(const Eigen::Vector3f& v0, const Eigen::Vector3f& v1);
//construct a line segment from the edge e of the halfedge mesh m
LineSegment(const HEMesh& m,const OpenMesh::EdgeHandle& e);
//returns an axis aligned bounding box of the line segment
Box ComputeBounds() const;
//returns true if the line segment overlaps the given box b
bool Overlaps(const Box& b) const;
//returns the point with smallest distance topoint p which lies on the line segment
Eigen::Vector3f ClosestPoint(const Eigen::Vector3f& p) const;
//returns the squared distance between point p and the line segment
float SqrDistance(const Eigen::Vector3f& p) const;
//returns the euclidean distance between point p and the line segment
float Distance(const Eigen::Vector3f& p) const;
//returns a reference point which is on the line segment and is used to sort the primitive in the AABB tree construction
Eigen::Vector3f ReferencePoint() const;
};