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comparison Framework/Toolbox/AffineTransform2D.cpp @ 574:911297a277c4

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AffineTransform2D::ConvertToOpenGLMatrix()
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 18 Apr 2019 18:06:29 +0200
parents b70e9be013e4
children 919226caca82
comparison
equal deleted inserted replaced
573:adc1be326b62 574:911297a277c4
88 matrix_(1, 0), matrix_(1, 1), matrix_(1, 2), 88 matrix_(1, 0), matrix_(1, 1), matrix_(1, 2),
89 interpolation, clear); 89 interpolation, clear);
90 } 90 }
91 91
92 92
93 void AffineTransform2D::ConvertToOpenGLMatrix(float target[16],
94 unsigned int canvasWidth,
95 unsigned int canvasHeight) const
96 {
97 const AffineTransform2D t = AffineTransform2D::Combine(
98 CreateOpenGLClipspace(canvasWidth, canvasHeight), *this);
99
100 const Matrix source = t.GetHomogeneousMatrix();
101
102 if (source.size1() != 3 ||
103 source.size2() != 3)
104 {
105 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
106 }
107
108 // "z" must be in the [-1,1] range, otherwise the texture does not show up
109 float z = 0;
110
111 // Embed the 3x3 affine transform of the 2D plane into a 4x4
112 // matrix (3D) for OpenGL. The matrix must be transposed.
113
114 target[0] = static_cast<float>(source(0, 0));
115 target[1] = static_cast<float>(source(1, 0));
116 target[2] = 0;
117 target[3] = static_cast<float>(source(2, 0));
118 target[4] = static_cast<float>(source(0, 1));
119 target[5] = static_cast<float>(source(1, 1));
120 target[6] = 0;
121 target[7] = static_cast<float>(source(2, 1));
122 target[8] = 0;
123 target[9] = 0;
124 target[10] = -1;
125 target[11] = 0;
126 target[12] = static_cast<float>(source(0, 2));
127 target[13] = static_cast<float>(source(1, 2));
128 target[14] = -z;
129 target[15] = static_cast<float>(source(2, 2));
130 }
131
132
93 AffineTransform2D AffineTransform2D::Invert(const AffineTransform2D& a) 133 AffineTransform2D AffineTransform2D::Invert(const AffineTransform2D& a)
94 { 134 {
95 AffineTransform2D t; 135 AffineTransform2D t;
96 LinearAlgebra::InvertMatrix(t.matrix_, a.matrix_); 136 LinearAlgebra::InvertMatrix(t.matrix_, a.matrix_);
97 return t; 137 return t;
161 t.matrix_(1, 0) = sine; 201 t.matrix_(1, 0) = sine;
162 t.matrix_(1, 1) = cosine; 202 t.matrix_(1, 1) = cosine;
163 203
164 return t; 204 return t;
165 } 205 }
206
207
208 AffineTransform2D AffineTransform2D::CreateOpenGLClipspace(unsigned int canvasWidth,
209 unsigned int canvasHeight)
210 {
211 AffineTransform2D t;
212 t.matrix_(0, 0) = 2.0 / static_cast<double>(canvasWidth);
213 t.matrix_(0, 2) = -1.0;
214 t.matrix_(1, 1) = -2.0 / static_cast<double>(canvasHeight);
215 t.matrix_(1, 2) = 1.0;
216
217 return t;
218 }
166 } 219 }