Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Scene2D/ScenePoint2D.h @ 1515:b750b6eab453
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 07 Jul 2020 20:52:35 +0200 |
parents | 244ad1e4e76a |
children | 8563ea5d8ae4 |
rev | line source |
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1 /** |
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2 * Stone of Orthanc |
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium |
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6 * |
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7 * This program is free software: you can redistribute it and/or |
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8 * modify it under the terms of the GNU Affero General Public License |
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9 * as published by the Free Software Foundation, either version 3 of |
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10 * the License, or (at your option) any later version. |
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11 * |
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12 * This program is distributed in the hope that it will be useful, but |
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 * Affero General Public License for more details. |
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16 * |
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17 * You should have received a copy of the GNU Affero General Public License |
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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19 **/ |
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20 |
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21 |
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22 #pragma once |
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23 |
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24 #include "../Toolbox/AffineTransform2D.h" |
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25 #include "../Toolbox/LinearAlgebra.h" |
699 | 26 |
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27 namespace OrthancStone |
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28 { |
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29 class ScenePoint2D |
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30 { |
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31 private: |
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32 double x_; |
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33 double y_; |
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34 |
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35 public: |
596 | 36 ScenePoint2D() : |
37 x_(0), | |
38 y_(0) | |
39 { | |
40 } | |
41 | |
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42 ScenePoint2D(double x, |
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43 double y) : |
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44 x_(x), |
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45 y_(y) |
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46 { |
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47 } |
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48 |
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49 double GetX() const |
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50 { |
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51 return x_; |
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52 } |
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53 |
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54 double GetY() const |
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55 { |
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56 return y_; |
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57 } |
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58 |
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59 ScenePoint2D Apply(const AffineTransform2D& t) const |
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60 { |
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61 double x = x_; |
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62 double y = y_; |
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63 t.Apply(x, y); |
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64 return ScenePoint2D(x, y); |
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65 } |
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66 |
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67 const ScenePoint2D operator-(const ScenePoint2D& a) const |
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68 { |
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69 ScenePoint2D v; |
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70 v.x_ = x_ - a.x_; |
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71 v.y_ = y_ - a.y_; |
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72 |
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73 return v; |
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74 } |
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75 |
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76 const ScenePoint2D operator+(const ScenePoint2D& a) const |
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77 { |
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78 ScenePoint2D v; |
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79 v.x_ = x_ + a.x_; |
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80 v.y_ = y_ + a.y_; |
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81 |
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82 return v; |
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83 } |
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84 |
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85 const ScenePoint2D operator*(double a) const |
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86 { |
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87 ScenePoint2D v; |
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88 v.x_ = x_ * a; |
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89 v.y_ = y_ * a; |
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90 |
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91 return v; |
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92 } |
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93 |
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94 const ScenePoint2D operator/(double a) const |
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95 { |
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96 ScenePoint2D v; |
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97 v.x_ = x_ / a; |
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98 v.y_ = y_ / a; |
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99 |
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100 return v; |
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101 } |
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102 |
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103 static void MidPoint(ScenePoint2D& result, const ScenePoint2D& a, const ScenePoint2D& b) |
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104 { |
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105 result.x_ = 0.5 * (a.x_ + b.x_); |
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106 result.y_ = 0.5 * (a.y_ + b.y_); |
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107 } |
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108 |
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109 static double Dot(const ScenePoint2D& a, const ScenePoint2D& b) |
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110 { |
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111 return a.x_ * b.x_ + a.y_ * b.y_; |
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112 } |
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113 |
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114 static double SquaredMagnitude(const ScenePoint2D& v) |
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115 { |
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116 return v.x_ * v.x_ + v.y_ * v.y_; |
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117 } |
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118 |
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119 static double Magnitude(const ScenePoint2D& v) |
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120 { |
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121 double squaredMagnitude = SquaredMagnitude(v); |
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122 if (LinearAlgebra::IsCloseToZero(squaredMagnitude)) |
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123 return 0.0; |
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124 return sqrt(squaredMagnitude); |
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125 } |
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126 |
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127 static double SquaredDistancePtPt(const ScenePoint2D& a, const ScenePoint2D& b) |
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128 { |
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129 ScenePoint2D n = b - a; |
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130 return Dot(n, n); |
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131 } |
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132 |
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133 static double DistancePtPt(const ScenePoint2D& a, const ScenePoint2D& b) |
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134 { |
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135 double squaredDist = SquaredDistancePtPt(a, b); |
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136 return sqrt(squaredDist); |
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137 } |
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138 |
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139 /** |
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140 Distance from point p to [a,b] segment |
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141 |
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142 Rewritten from https://www.randygaul.net/2014/07/23/distance-point-to-line-segment/ |
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143 */ |
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144 static double SquaredDistancePtSegment(const ScenePoint2D& a, const ScenePoint2D& b, const ScenePoint2D& p) |
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145 { |
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146 ScenePoint2D n = b - a; |
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147 ScenePoint2D pa = a - p; |
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148 |
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149 double c = Dot(n, pa); |
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150 |
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151 // Closest point is a |
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152 if (c > 0.0) |
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153 return Dot(pa, pa); |
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154 |
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155 ScenePoint2D bp = p - b; |
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156 |
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157 // Closest point is b |
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158 if (Dot(n, bp) > 0.0) |
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159 return Dot(bp, bp); |
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160 |
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161 // if segment length is very short, we approximate distance to the |
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162 // distance with a |
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163 double nq = Dot(n, n); |
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164 if (LinearAlgebra::IsCloseToZero(nq)) |
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165 { |
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166 // segment is very small: approximate distance from point to segment |
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167 // with distance from p to a |
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168 return Dot(pa, pa); |
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169 } |
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170 else |
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171 { |
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172 // Closest point is between a and b |
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173 ScenePoint2D e = pa - n * (c / nq); |
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174 return Dot(e, e); |
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175 } |
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176 } |
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177 }; |
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178 } |
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179 |