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annotate OrthancStone/Sources/Toolbox/AffineTransform2D.cpp @ 1871:7053b8a0aaec

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:18:48 +0100
parents 3889ae96d2e9
children 4e80b8afd0da
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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
1871
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5 * Copyright (C) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "AffineTransform2D.h"
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25
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26 #include "ImageGeometry.h"
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27
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28 #include <Logging.h>
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29 #include <OrthancException.h>
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30
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31 namespace OrthancStone
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32 {
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33 AffineTransform2D::AffineTransform2D() :
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34 matrix_(LinearAlgebra::IdentityMatrix(3))
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35 {
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36 }
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37
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38
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39 AffineTransform2D::AffineTransform2D(const Matrix& m)
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40 {
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41 if (m.size1() != 3 ||
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42 m.size2() != 3)
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43 {
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44 throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageSize);
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45 }
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46
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47 if (!LinearAlgebra::IsCloseToZero(m(2, 0)) ||
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48 !LinearAlgebra::IsCloseToZero(m(2, 1)) ||
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49 LinearAlgebra::IsCloseToZero(m(2, 2)))
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50 {
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51 LOG(ERROR) << "Cannot setup an AffineTransform2D with perspective effects";
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52 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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53 }
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54
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55 matrix_ = m / m(2, 2);
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56 }
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57
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58
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59 void AffineTransform2D::Apply(double& x /* inout */,
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60 double& y /* inout */) const
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61 {
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62 Vector p;
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63 LinearAlgebra::AssignVector(p, x, y, 1);
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64
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65 Vector q = LinearAlgebra::Product(matrix_, p);
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66
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67 if (!LinearAlgebra::IsNear(q[2], 1.0))
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68 {
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69 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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70 }
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71 else
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72 {
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73 x = q[0];
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74 y = q[1];
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75 }
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76 }
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77
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78
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79 void AffineTransform2D::Apply(Orthanc::ImageAccessor& target,
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80 const Orthanc::ImageAccessor& source,
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81 ImageInterpolation interpolation,
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82 bool clear) const
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83 {
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84 assert(LinearAlgebra::IsNear(matrix_(2, 0), 0) &&
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85 LinearAlgebra::IsNear(matrix_(2, 1), 0) &&
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86 LinearAlgebra::IsNear(matrix_(2, 2), 1));
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87
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88 ApplyAffineTransform(target, source,
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89 matrix_(0, 0), matrix_(0, 1), matrix_(0, 2),
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90 matrix_(1, 0), matrix_(1, 1), matrix_(1, 2),
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91 interpolation, clear);
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92 }
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93
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94
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95 void AffineTransform2D::ConvertToOpenGLMatrix(float target[16],
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96 unsigned int canvasWidth,
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97 unsigned int canvasHeight) const
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98 {
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99 const AffineTransform2D t = AffineTransform2D::Combine(
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100 CreateOpenGLClipspace(canvasWidth, canvasHeight), *this);
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101
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102 const Matrix source = t.GetHomogeneousMatrix();
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103
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104 if (source.size1() != 3 ||
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105 source.size2() != 3)
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106 {
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107 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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108 }
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109
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110 // "z" must be in the [-1,1] range, otherwise the texture does not show up
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111 float z = 0;
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112
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113 // Embed the 3x3 affine transform of the 2D plane into a 4x4
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114 // matrix (3D) for OpenGL. The matrix must be transposed.
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115
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116 target[0] = static_cast<float>(source(0, 0));
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117 target[1] = static_cast<float>(source(1, 0));
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118 target[2] = 0;
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119 target[3] = static_cast<float>(source(2, 0));
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120 target[4] = static_cast<float>(source(0, 1));
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121 target[5] = static_cast<float>(source(1, 1));
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122 target[6] = 0;
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123 target[7] = static_cast<float>(source(2, 1));
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124 target[8] = 0;
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125 target[9] = 0;
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126 target[10] = -1;
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127 target[11] = 0;
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128 target[12] = static_cast<float>(source(0, 2));
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129 target[13] = static_cast<float>(source(1, 2));
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130 target[14] = -z;
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131 target[15] = static_cast<float>(source(2, 2));
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132 }
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133
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134
575
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135 double AffineTransform2D::ComputeZoom() const
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136 {
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137 // Compute the length of the (0,0)-(1,1) diagonal (whose
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138 // length is sqrt(2)) instead of the (0,0)-(1,0) unit segment,
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139 // in order to cope with possible anisotropic zooming
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140
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141 double x1 = 0;
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142 double y1 = 0;
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143 Apply(x1, y1);
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144
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145 double x2 = 1;
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146 double y2 = 1;
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147 Apply(x2, y2);
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148
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149 double dx = x2 - x1;
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150 double dy = y2 - y1;
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151
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152 double zoom = sqrt(dx * dx + dy * dy) / sqrt(2.0);
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153
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154 if (LinearAlgebra::IsCloseToZero(zoom))
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155 {
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156 return 1; // Default value if transform is ill-conditioned
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157 }
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158 else
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159 {
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160 return zoom;
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161 }
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162 }
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163
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164
409
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165 AffineTransform2D AffineTransform2D::Invert(const AffineTransform2D& a)
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166 {
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167 AffineTransform2D t;
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168 LinearAlgebra::InvertMatrix(t.matrix_, a.matrix_);
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169 return t;
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170 }
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171
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172
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173 AffineTransform2D AffineTransform2D::Combine(const AffineTransform2D& a,
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174 const AffineTransform2D& b)
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175 {
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176 return AffineTransform2D(LinearAlgebra::Product(a.GetHomogeneousMatrix(),
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177 b.GetHomogeneousMatrix()));
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178 }
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179
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180
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181 AffineTransform2D AffineTransform2D::Combine(const AffineTransform2D& a,
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182 const AffineTransform2D& b,
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183 const AffineTransform2D& c)
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184 {
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185 return AffineTransform2D(LinearAlgebra::Product(a.GetHomogeneousMatrix(),
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186 b.GetHomogeneousMatrix(),
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187 c.GetHomogeneousMatrix()));
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188 }
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189
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190
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191 AffineTransform2D AffineTransform2D::Combine(const AffineTransform2D& a,
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192 const AffineTransform2D& b,
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193 const AffineTransform2D& c,
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194 const AffineTransform2D& d)
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195 {
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196 return AffineTransform2D(LinearAlgebra::Product(a.GetHomogeneousMatrix(),
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197 b.GetHomogeneousMatrix(),
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198 c.GetHomogeneousMatrix(),
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199 d.GetHomogeneousMatrix()));
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200 }
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201
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202 AffineTransform2D AffineTransform2D::Combine(const AffineTransform2D& a,
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203 const AffineTransform2D& b,
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204 const AffineTransform2D& c,
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205 const AffineTransform2D& d,
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206 const AffineTransform2D& e)
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207 {
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208 return AffineTransform2D(LinearAlgebra::Product(a.GetHomogeneousMatrix(),
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209 b.GetHomogeneousMatrix(),
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210 c.GetHomogeneousMatrix(),
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211 d.GetHomogeneousMatrix(),
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212 e.GetHomogeneousMatrix()));
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213 }
409
99c9b3238008 AffineTransform2D
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214
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215 AffineTransform2D AffineTransform2D::CreateOffset(double dx,
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216 double dy)
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217 {
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218 AffineTransform2D t;
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219 t.matrix_(0, 2) = dx;
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220 t.matrix_(1, 2) = dy;
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221
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222 return t;
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223 }
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224
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225
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226 AffineTransform2D AffineTransform2D::CreateScaling(double sx,
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227 double sy)
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228 {
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229 AffineTransform2D t;
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230 t.matrix_(0, 0) = sx;
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231 t.matrix_(1, 1) = sy;
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232
99c9b3238008 AffineTransform2D
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233 return t;
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234 }
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235
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236
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237 AffineTransform2D AffineTransform2D::CreateRotation(double angle)
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238 {
99c9b3238008 AffineTransform2D
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239 double cosine = cos(angle);
99c9b3238008 AffineTransform2D
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240 double sine = sin(angle);
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241
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242 AffineTransform2D t;
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243 t.matrix_(0, 0) = cosine;
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244 t.matrix_(0, 1) = -sine;
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245 t.matrix_(1, 0) = sine;
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246 t.matrix_(1, 1) = cosine;
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247
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248 return t;
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249 }
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250
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251 AffineTransform2D AffineTransform2D::CreateRotation(double angle, // CW rotation
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252 double cx, // rotation center
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253 double cy) // rotation center
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254 {
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255 return Combine(
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256 CreateOffset(cx, cy),
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257 CreateRotation(angle),
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258 CreateOffset(-cx, -cy)
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259 );
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260 }
574
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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261
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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262 AffineTransform2D AffineTransform2D::CreateOpenGLClipspace(unsigned int canvasWidth,
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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diff changeset
263 unsigned int canvasHeight)
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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diff changeset
264 {
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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265 AffineTransform2D t;
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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266 t.matrix_(0, 0) = 2.0 / static_cast<double>(canvasWidth);
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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267 t.matrix_(0, 2) = -1.0;
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diff changeset
268 t.matrix_(1, 1) = -2.0 / static_cast<double>(canvasHeight);
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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269 t.matrix_(1, 2) = 1.0;
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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270
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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271 return t;
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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diff changeset
272 }
1554
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273
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274
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Sebastien Jodogne <s.jodogne@gmail.com>
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275 AffineTransform2D AffineTransform2D::CreateFlip(bool flipX,
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276 bool flipY,
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277 unsigned int width,
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278 unsigned int height)
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279 {
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280 AffineTransform2D t;
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281 t.matrix_(0, 0) = (flipX ? -1 : 1);
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Sebastien Jodogne <s.jodogne@gmail.com>
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282 t.matrix_(0, 2) = (flipX ? width : 0);
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283 t.matrix_(1, 1) = (flipY ? -1 : 1);
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284 t.matrix_(1, 2) = (flipY ? height : 0);
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285
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286 return t;
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287 }
409
99c9b3238008 AffineTransform2D
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288 }