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line3d.h
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1 // Copyright (C) 2002-2010 Nikolaus Gebhardt
2 // This file is part of the "Irrlicht Engine".
3 // For conditions of distribution and use, see copyright notice in irrlicht.h
4 
5 #ifndef __IRR_LINE_3D_H_INCLUDED__
6 #define __IRR_LINE_3D_H_INCLUDED__
7 
8 #include "irrTypes.h"
9 #include "vector3d.h"
10 
11 namespace irr
12 {
13 namespace core
14 {
15 
17 template <class T>
18 class line3d
19 {
20  public:
21 
23 
24  line3d() : start(0,0,0), end(1,1,1) {}
26  line3d(T xa, T ya, T za, T xb, T yb, T zb) : start(xa, ya, za), end(xb, yb, zb) {}
28  line3d(const vector3d<T>& start, const vector3d<T>& end) : start(start), end(end) {}
29 
30  // operators
31 
32  line3d<T> operator+(const vector3d<T>& point) const { return line3d<T>(start + point, end + point); }
33  line3d<T>& operator+=(const vector3d<T>& point) { start += point; end += point; return *this; }
34 
35  line3d<T> operator-(const vector3d<T>& point) const { return line3d<T>(start - point, end - point); }
36  line3d<T>& operator-=(const vector3d<T>& point) { start -= point; end -= point; return *this; }
37 
38  bool operator==(const line3d<T>& other) const
39  { return (start==other.start && end==other.end) || (end==other.start && start==other.end);}
40  bool operator!=(const line3d<T>& other) const
41  { return !(start==other.start && end==other.end) || (end==other.start && start==other.end);}
42 
43  // functions
45  void setLine(const T& xa, const T& ya, const T& za, const T& xb, const T& yb, const T& zb)
46  {start.set(xa, ya, za); end.set(xb, yb, zb);}
48  void setLine(const vector3d<T>& nstart, const vector3d<T>& nend)
49  {start.set(nstart); end.set(nend);}
51  void setLine(const line3d<T>& line)
52  {start.set(line.start); end.set(line.end);}
53 
55 
56  T getLength() const { return start.getDistanceFrom(end); }
57 
59 
60  T getLengthSQ() const { return start.getDistanceFromSQ(end); }
61 
63 
65  {
66  return (start + end) * (T)0.5;
67  }
68 
70 
72  {
73  return end - start;
74  }
75 
77 
81  bool isPointBetweenStartAndEnd(const vector3d<T>& point) const
82  {
83  return point.isBetweenPoints(start, end);
84  }
85 
87 
90  {
91  vector3d<T> c = point - start;
92  vector3d<T> v = end - start;
93  T d = (T)v.getLength();
94  v /= d;
95  T t = v.dotProduct(c);
96 
97  if (t < (T)0.0)
98  return start;
99  if (t > d)
100  return end;
101 
102  v *= t;
103  return start + v;
104  }
105 
107 
113  bool getIntersectionWithSphere(vector3d<T> sorigin, T sradius, f64& outdistance) const
114  {
115  const vector3d<T> q = sorigin - start;
116  T c = q.getLength();
117  T v = q.dotProduct(getVector().normalize());
118  T d = sradius * sradius - (c*c - v*v);
119 
120  if (d < 0.0)
121  return false;
122 
123  outdistance = v - core::squareroot ( d );
124  return true;
125  }
126 
127  // member variables
128 
133 };
134 
139 
140 } // end namespace core
141 } // end namespace irr
142 
143 #endif
144 

The Irrlicht Engine
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