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annotate OrthancStone/Sources/Toolbox/AffineTransform2D.cpp @ 1739:9ac2a65d4172

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upgrade to year 2021
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 06 Jan 2021 17:50:00 +0100
parents 8563ea5d8ae4
children 3889ae96d2e9
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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) 2017-2021 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 Lesser 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 * Lesser 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 Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "AffineTransform2D.h"
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24
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25 #include "ImageGeometry.h"
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26
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27 #include <Logging.h>
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28 #include <OrthancException.h>
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29
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30 namespace OrthancStone
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31 {
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32 AffineTransform2D::AffineTransform2D() :
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33 matrix_(LinearAlgebra::IdentityMatrix(3))
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34 {
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35 }
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36
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37
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38 AffineTransform2D::AffineTransform2D(const Matrix& m)
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39 {
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40 if (m.size1() != 3 ||
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41 m.size2() != 3)
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42 {
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43 throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageSize);
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44 }
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45
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46 if (!LinearAlgebra::IsCloseToZero(m(2, 0)) ||
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47 !LinearAlgebra::IsCloseToZero(m(2, 1)) ||
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48 LinearAlgebra::IsCloseToZero(m(2, 2)))
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49 {
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50 LOG(ERROR) << "Cannot setup an AffineTransform2D with perspective effects";
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51 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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52 }
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53
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54 matrix_ = m / m(2, 2);
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55 }
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56
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57
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58 void AffineTransform2D::Apply(double& x /* inout */,
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59 double& y /* inout */) const
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60 {
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61 Vector p;
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62 LinearAlgebra::AssignVector(p, x, y, 1);
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63
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64 Vector q = LinearAlgebra::Product(matrix_, p);
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65
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66 if (!LinearAlgebra::IsNear(q[2], 1.0))
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67 {
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68 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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69 }
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70 else
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71 {
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72 x = q[0];
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73 y = q[1];
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74 }
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75 }
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76
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77
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78 void AffineTransform2D::Apply(Orthanc::ImageAccessor& target,
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79 const Orthanc::ImageAccessor& source,
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80 ImageInterpolation interpolation,
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81 bool clear) const
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82 {
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83 assert(LinearAlgebra::IsNear(matrix_(2, 0), 0) &&
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84 LinearAlgebra::IsNear(matrix_(2, 1), 0) &&
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85 LinearAlgebra::IsNear(matrix_(2, 2), 1));
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86
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87 ApplyAffineTransform(target, source,
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88 matrix_(0, 0), matrix_(0, 1), matrix_(0, 2),
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89 matrix_(1, 0), matrix_(1, 1), matrix_(1, 2),
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90 interpolation, clear);
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91 }
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92
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93
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94 void AffineTransform2D::ConvertToOpenGLMatrix(float target[16],
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95 unsigned int canvasWidth,
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96 unsigned int canvasHeight) const
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97 {
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98 const AffineTransform2D t = AffineTransform2D::Combine(
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99 CreateOpenGLClipspace(canvasWidth, canvasHeight), *this);
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100
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101 const Matrix source = t.GetHomogeneousMatrix();
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102
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103 if (source.size1() != 3 ||
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104 source.size2() != 3)
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105 {
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106 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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107 }
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108
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109 // "z" must be in the [-1,1] range, otherwise the texture does not show up
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110 float z = 0;
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111
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112 // Embed the 3x3 affine transform of the 2D plane into a 4x4
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113 // matrix (3D) for OpenGL. The matrix must be transposed.
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114
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115 target[0] = static_cast<float>(source(0, 0));
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116 target[1] = static_cast<float>(source(1, 0));
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117 target[2] = 0;
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118 target[3] = static_cast<float>(source(2, 0));
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119 target[4] = static_cast<float>(source(0, 1));
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120 target[5] = static_cast<float>(source(1, 1));
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121 target[6] = 0;
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122 target[7] = static_cast<float>(source(2, 1));
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123 target[8] = 0;
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124 target[9] = 0;
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125 target[10] = -1;
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126 target[11] = 0;
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127 target[12] = static_cast<float>(source(0, 2));
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128 target[13] = static_cast<float>(source(1, 2));
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129 target[14] = -z;
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130 target[15] = static_cast<float>(source(2, 2));
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131 }
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132
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133
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134 double AffineTransform2D::ComputeZoom() const
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135 {
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136 // Compute the length of the (0,0)-(1,1) diagonal (whose
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137 // length is sqrt(2)) instead of the (0,0)-(1,0) unit segment,
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138 // in order to cope with possible anisotropic zooming
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139
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140 double x1 = 0;
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141 double y1 = 0;
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142 Apply(x1, y1);
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143
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144 double x2 = 1;
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145 double y2 = 1;
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146 Apply(x2, y2);
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147
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148 double dx = x2 - x1;
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149 double dy = y2 - y1;
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150
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151 double zoom = sqrt(dx * dx + dy * dy) / sqrt(2.0);
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152
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153 if (LinearAlgebra::IsCloseToZero(zoom))
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154 {
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155 return 1; // Default value if transform is ill-conditioned
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156 }
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157 else
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158 {
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159 return zoom;
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160 }
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161 }
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162
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163
409
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164 AffineTransform2D AffineTransform2D::Invert(const AffineTransform2D& a)
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165 {
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166 AffineTransform2D t;
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167 LinearAlgebra::InvertMatrix(t.matrix_, a.matrix_);
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168 return t;
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169 }
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170
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171
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172 AffineTransform2D AffineTransform2D::Combine(const AffineTransform2D& a,
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173 const AffineTransform2D& b)
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174 {
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175 return AffineTransform2D(LinearAlgebra::Product(a.GetHomogeneousMatrix(),
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176 b.GetHomogeneousMatrix()));
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177 }
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178
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179
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180 AffineTransform2D AffineTransform2D::Combine(const AffineTransform2D& a,
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181 const AffineTransform2D& b,
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182 const AffineTransform2D& c)
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183 {
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184 return AffineTransform2D(LinearAlgebra::Product(a.GetHomogeneousMatrix(),
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185 b.GetHomogeneousMatrix(),
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186 c.GetHomogeneousMatrix()));
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187 }
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188
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189
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190 AffineTransform2D AffineTransform2D::Combine(const AffineTransform2D& a,
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191 const AffineTransform2D& b,
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192 const AffineTransform2D& c,
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193 const AffineTransform2D& d)
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194 {
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195 return AffineTransform2D(LinearAlgebra::Product(a.GetHomogeneousMatrix(),
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196 b.GetHomogeneousMatrix(),
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197 c.GetHomogeneousMatrix(),
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198 d.GetHomogeneousMatrix()));
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199 }
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200
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201 AffineTransform2D AffineTransform2D::Combine(const AffineTransform2D& a,
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202 const AffineTransform2D& b,
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203 const AffineTransform2D& c,
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204 const AffineTransform2D& d,
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205 const AffineTransform2D& e)
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206 {
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207 return AffineTransform2D(LinearAlgebra::Product(a.GetHomogeneousMatrix(),
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208 b.GetHomogeneousMatrix(),
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209 c.GetHomogeneousMatrix(),
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210 d.GetHomogeneousMatrix(),
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211 e.GetHomogeneousMatrix()));
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212 }
409
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213
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214 AffineTransform2D AffineTransform2D::CreateOffset(double dx,
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215 double dy)
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216 {
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217 AffineTransform2D t;
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218 t.matrix_(0, 2) = dx;
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219 t.matrix_(1, 2) = dy;
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220
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221 return t;
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222 }
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223
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224
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225 AffineTransform2D AffineTransform2D::CreateScaling(double sx,
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226 double sy)
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227 {
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228 AffineTransform2D t;
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229 t.matrix_(0, 0) = sx;
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230 t.matrix_(1, 1) = sy;
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231
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232 return t;
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233 }
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234
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235
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236 AffineTransform2D AffineTransform2D::CreateRotation(double angle)
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237 {
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238 double cosine = cos(angle);
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239 double sine = sin(angle);
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240
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241 AffineTransform2D t;
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242 t.matrix_(0, 0) = cosine;
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243 t.matrix_(0, 1) = -sine;
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244 t.matrix_(1, 0) = sine;
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245 t.matrix_(1, 1) = cosine;
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246
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247 return t;
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248 }
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249
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250 AffineTransform2D AffineTransform2D::CreateRotation(double angle, // CW rotation
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251 double cx, // rotation center
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252 double cy) // rotation center
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253 {
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254 return Combine(
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255 CreateOffset(cx, cy),
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256 CreateRotation(angle),
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257 CreateOffset(-cx, -cy)
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258 );
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259 }
574
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260
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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261 AffineTransform2D AffineTransform2D::CreateOpenGLClipspace(unsigned int canvasWidth,
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262 unsigned int canvasHeight)
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263 {
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264 AffineTransform2D t;
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265 t.matrix_(0, 0) = 2.0 / static_cast<double>(canvasWidth);
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266 t.matrix_(0, 2) = -1.0;
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267 t.matrix_(1, 1) = -2.0 / static_cast<double>(canvasHeight);
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268 t.matrix_(1, 2) = 1.0;
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269
911297a277c4 AffineTransform2D::ConvertToOpenGLMatrix()
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270 return t;
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271 }
1554
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272
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273
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274 AffineTransform2D AffineTransform2D::CreateFlip(bool flipX,
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275 bool flipY,
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276 unsigned int width,
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277 unsigned int height)
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278 {
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279 AffineTransform2D t;
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280 t.matrix_(0, 0) = (flipX ? -1 : 1);
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281 t.matrix_(0, 2) = (flipX ? width : 0);
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282 t.matrix_(1, 1) = (flipY ? -1 : 1);
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283 t.matrix_(1, 2) = (flipY ? height : 0);
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284
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285 return t;
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286 }
409
99c9b3238008 AffineTransform2D
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287 }