Developer Documentation
PolyLineBezierSplineData.cc
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41 
42 
43 
44 //=============================================================================
45 //
46 // CLASS PolyLineCircleData - IMPLEMENTATION
47 //
48 //=============================================================================
49 
50 
51 //== INCLUDES =================================================================
52 
53 #include "PolyLineBezierSplineData.hh"
54 
56 : meshIndex_(_meshIndex)
57 {
58 }
59 
61 {
63  p.position = _position;
64  p.normal = _normal;
65 
66  points_.push_back(p);
67 }
68 
70 {
71  if(points_.size() < 2)
72  return false;
73 
74  handles_.clear();
75 
76  for(unsigned int i = 0; i + 1 < points_.size(); i++) {
77 
78  const ACG::Vec3d firstPoint = points_[i].position, sndPoint = points_[i + 1].position;
79  double r = (firstPoint - sndPoint).norm() / 4.0;
80  const ACG::Vec3d dir = sndPoint - firstPoint;
81  const ACG::Vec3d ort0 = dir % points_[i].normal, ort1 = dir % points_[i + 1].normal;
82  ACG::Vec3d f0 = ort0 % points_[i].normal, f1 = ort1 % points_[i + 1].normal;
83 
84  ACG::Vec3d near = firstPoint - f0.normalize() * r,
85  far = sndPoint + f1.normalize() * r;
86 
87  handles_.push_back(near);
88  handles_.push_back(far);
89 
90  }
91 
92  //handles will be degenerate up to now
93  for(unsigned int i = 1; i + 1 < handles_.size(); i += 2) {
94 
95  const ACG::Vec3d dir = (handles_[i + 1] - handles_[i]) / 2.0;
96 
98  handles_[i + 1] = p.position + dir;
99  handles_[i] = p.position - dir;
100  }
101 
102  return true;
103 }
104 
106 {
107  if(!_handleIndex)
108  return points_[0];
109  else if(_handleIndex == handles_.size())
110  return points_.back();
111  else return points_[(_handleIndex - 1) / 2 + 1];
112 }
auto normalize() -> decltype(*this/=std::declval< VectorT< S, DIM >>().norm())
Definition: Vector11T.hh:429
PolyLineBezierSplineData(unsigned int _meshIndex)
Creates a new PolyLineBezierSplineData object with no points.
void addInterpolatePoint(ACG::Vec3d _position, ACG::Vec3d _normal)
Adds a point to the end of the list and inserts control points.
bool finishSpline()
If possible calculates handles.
InterpolatePoint & getInterpolatePoint(unsigned int _handleIndex)
Retrieves the interpolate point based on the handle.