1 ///////////////////////////////////////////////////////////////////////////////
2 // Name: src/common/matrix.cpp
3 // Purpose: wxTransformMatrix class
4 // Author: Chris Breeze, Julian Smart
5 // Modified by: Klaas Holwerda
8 // Copyright: (c) Julian Smart
9 // Licence: wxWindows licence
10 ///////////////////////////////////////////////////////////////////////////////
12 // Note: this is intended to be used in wxDC at some point to replace
13 // the current system of scaling/translation. It is not yet used.
15 // For compilers that support precompilation, includes "wx.h".
16 #include "wx/wxprec.h"
22 #include "wx/matrix.h"
28 static const double pi = M_PI;
30 wxTransformMatrix::wxTransformMatrix(void)
37 wxTransformMatrix::wxTransformMatrix(const wxTransformMatrix& mat)
43 double wxTransformMatrix::GetValue(int col, int row) const
45 if (row < 0 || row > 2 || col < 0 || col > 2)
48 return m_matrix[col][row];
51 void wxTransformMatrix::SetValue(int col, int row, double value)
53 if (row < 0 || row > 2 || col < 0 || col > 2)
56 m_matrix[col][row] = value;
57 m_isIdentity = IsIdentity1();
60 void wxTransformMatrix::operator = (const wxTransformMatrix& mat)
63 for (i = 0; i < 3; i++)
65 for (j = 0; j < 3; j++)
67 m_matrix[i][j] = mat.m_matrix[i][j];
70 m_isIdentity = mat.m_isIdentity;
73 bool wxTransformMatrix::operator == (const wxTransformMatrix& mat) const
75 if (m_isIdentity && mat.m_isIdentity)
79 for (i = 0; i < 3; i++)
81 for (j = 0; j < 3; j++)
83 if ( !wxIsSameDouble(m_matrix[i][j], mat.m_matrix[i][j]) )
90 bool wxTransformMatrix::operator != (const wxTransformMatrix& mat) const
92 return (! ((*this) == mat));
95 double& wxTransformMatrix::operator()(int col, int row)
97 if (row < 0 || row > 2 || col < 0 || col > 2)
98 return m_matrix[0][0];
100 return m_matrix[col][row];
103 double wxTransformMatrix::operator()(int col, int row) const
105 if (row < 0 || row > 2 || col < 0 || col > 2)
108 return m_matrix[col][row];
112 bool wxTransformMatrix::Invert(void)
114 double inverseMatrix[3][3];
116 // calculate the adjoint
117 inverseMatrix[0][0] = wxCalculateDet(m_matrix[1][1],m_matrix[2][1],m_matrix[1][2],m_matrix[2][2]);
118 inverseMatrix[0][1] = -wxCalculateDet(m_matrix[0][1],m_matrix[2][1],m_matrix[0][2],m_matrix[2][2]);
119 inverseMatrix[0][2] = wxCalculateDet(m_matrix[0][1],m_matrix[1][1],m_matrix[0][2],m_matrix[1][2]);
121 inverseMatrix[1][0] = -wxCalculateDet(m_matrix[1][0],m_matrix[2][0],m_matrix[1][2],m_matrix[2][2]);
122 inverseMatrix[1][1] = wxCalculateDet(m_matrix[0][0],m_matrix[2][0],m_matrix[0][2],m_matrix[2][2]);
123 inverseMatrix[1][2] = -wxCalculateDet(m_matrix[0][0],m_matrix[1][0],m_matrix[0][2],m_matrix[1][2]);
125 inverseMatrix[2][0] = wxCalculateDet(m_matrix[1][0],m_matrix[2][0],m_matrix[1][1],m_matrix[2][1]);
126 inverseMatrix[2][1] = -wxCalculateDet(m_matrix[0][0],m_matrix[2][0],m_matrix[0][1],m_matrix[2][1]);
127 inverseMatrix[2][2] = wxCalculateDet(m_matrix[0][0],m_matrix[1][0],m_matrix[0][1],m_matrix[1][1]);
129 // now divide by the determinant
130 double det = m_matrix[0][0] * inverseMatrix[0][0] + m_matrix[0][1] * inverseMatrix[1][0] + m_matrix[0][2] * inverseMatrix[2][0];
131 if ( wxIsNullDouble(det) )
134 inverseMatrix[0][0] /= det; inverseMatrix[1][0] /= det; inverseMatrix[2][0] /= det;
135 inverseMatrix[0][1] /= det; inverseMatrix[1][1] /= det; inverseMatrix[2][1] /= det;
136 inverseMatrix[0][2] /= det; inverseMatrix[1][2] /= det; inverseMatrix[2][2] /= det;
138 for (int i = 0; i < 3; i++)
140 for (int j = 0; j < 3; j++)
142 m_matrix[i][j] = inverseMatrix[i][j];
145 m_isIdentity = IsIdentity1();
149 // Make into identity matrix
150 bool wxTransformMatrix::Identity(void)
152 m_matrix[0][0] = m_matrix[1][1] = m_matrix[2][2] = 1.0;
153 m_matrix[1][0] = m_matrix[2][0] = m_matrix[0][1] = m_matrix[2][1] = m_matrix[0][2] = m_matrix[1][2] = 0.0;
159 // Scale by scale (isotropic scaling i.e. the same in x and y):
161 // matrix' = | 0 scale 0 | x matrix
164 bool wxTransformMatrix::Scale(double scale)
167 for (i = 0; i < 3; i++)
169 for (j = 0; j < 3; j++)
171 m_matrix[i][j] *= scale;
174 m_isIdentity = IsIdentity1();
180 // scale a matrix in 2D
186 wxTransformMatrix& wxTransformMatrix::Scale(const double &xs, const double &ys,const double &xc, const double &yc)
188 double r00,r10,r20,r01,r11,r21;
192 double tx = xc*(1-xs);
193 double ty = yc*(1-ys);
201 else if ( !wxIsNullDouble(xc) || !wxIsNullDouble(yc) )
203 double tx = xc*(1-xs);
204 double ty = yc*(1-ys);
205 r00 = xs * m_matrix[0][0];
206 r10 = xs * m_matrix[1][0];
207 r20 = xs * m_matrix[2][0] + tx;
208 r01 = ys * m_matrix[0][1];
209 r11 = ys * m_matrix[1][1];
210 r21 = ys * m_matrix[2][1] + ty;
214 r00 = xs * m_matrix[0][0];
215 r10 = xs * m_matrix[1][0];
216 r20 = xs * m_matrix[2][0];
217 r01 = ys * m_matrix[0][1];
218 r11 = ys * m_matrix[1][1];
219 r21 = ys * m_matrix[2][1];
222 m_matrix[0][0] = r00;
223 m_matrix[1][0] = r10;
224 m_matrix[2][0] = r20;
225 m_matrix[0][1] = r01;
226 m_matrix[1][1] = r11;
227 m_matrix[2][1] = r21;
230 // first translate to origin O
231 (*this).Translate(-x_cen, -y_cen);
233 // now do the scaling
234 wxTransformMatrix scale;
235 scale.m_matrix[0][0] = x_fac;
236 scale.m_matrix[1][1] = y_fac;
237 scale.m_isIdentity = IsIdentity1();
239 *this = scale * (*this);
241 // translate back from origin to x_cen, y_cen
242 (*this).Translate(x_cen, y_cen);
245 m_isIdentity = IsIdentity1();
251 // mirror a matrix in x, y
256 wxTransformMatrix& wxTransformMatrix::Mirror(bool x, bool y)
258 wxTransformMatrix temp;
261 temp.m_matrix[1][1] = -1;
262 temp.m_isIdentity=false;
266 temp.m_matrix[0][0] = -1;
267 temp.m_isIdentity=false;
270 *this = temp * (*this);
271 m_isIdentity = IsIdentity1();
275 // Translate by dx, dy:
277 // matrix' = | 0 1 dy | x matrix
280 bool wxTransformMatrix::Translate(double dx, double dy)
283 for (i = 0; i < 3; i++)
284 m_matrix[i][0] += dx * m_matrix[i][2];
285 for (i = 0; i < 3; i++)
286 m_matrix[i][1] += dy * m_matrix[i][2];
288 m_isIdentity = IsIdentity1();
293 // Rotate clockwise by the given number of degrees:
295 // matrix' = | -sin cos 0 | x matrix
297 bool wxTransformMatrix::Rotate(double degrees)
299 Rotate(-degrees,0,0);
303 // counter clockwise rotate around a point
305 // cos(r) -sin(r) x(1-cos(r))+y(sin(r)
306 // sin(r) cos(r) y(1-cos(r))-x(sin(r)
308 wxTransformMatrix& wxTransformMatrix::Rotate(const double °rees, const double &x, const double &y)
310 double angle = degrees * pi / 180.0;
311 double c = cos(angle);
312 double s = sin(angle);
313 double r00,r10,r20,r01,r11,r21;
317 double tx = x*(1-c)+y*s;
318 double ty = y*(1-c)-x*s;
326 else if ( !wxIsNullDouble(x) || !wxIsNullDouble(y) )
328 double tx = x*(1-c)+y*s;
329 double ty = y*(1-c)-x*s;
330 r00 = c * m_matrix[0][0] - s * m_matrix[0][1] + tx * m_matrix[0][2];
331 r10 = c * m_matrix[1][0] - s * m_matrix[1][1] + tx * m_matrix[1][2];
332 r20 = c * m_matrix[2][0] - s * m_matrix[2][1] + tx;// * m_matrix[2][2];
333 r01 = c * m_matrix[0][1] + s * m_matrix[0][0] + ty * m_matrix[0][2];
334 r11 = c * m_matrix[1][1] + s * m_matrix[1][0] + ty * m_matrix[1][2];
335 r21 = c * m_matrix[2][1] + s * m_matrix[2][0] + ty;// * m_matrix[2][2];
339 r00 = c * m_matrix[0][0] - s * m_matrix[0][1];
340 r10 = c * m_matrix[1][0] - s * m_matrix[1][1];
341 r20 = c * m_matrix[2][0] - s * m_matrix[2][1];
342 r01 = c * m_matrix[0][1] + s * m_matrix[0][0];
343 r11 = c * m_matrix[1][1] + s * m_matrix[1][0];
344 r21 = c * m_matrix[2][1] + s * m_matrix[2][0];
347 m_matrix[0][0] = r00;
348 m_matrix[1][0] = r10;
349 m_matrix[2][0] = r20;
350 m_matrix[0][1] = r01;
351 m_matrix[1][1] = r11;
352 m_matrix[2][1] = r21;
355 wxTransformMatrix rotate;
356 rotate.m_matrix[2][0] = tx;
357 rotate.m_matrix[2][1] = ty;
359 rotate.m_matrix[0][0] = c;
360 rotate.m_matrix[0][1] = s;
362 rotate.m_matrix[1][0] = -s;
363 rotate.m_matrix[1][1] = c;
365 rotate.m_isIdentity=false;
366 *this = rotate * (*this);
368 m_isIdentity = IsIdentity1();
373 // Transform a point from logical to device coordinates
374 bool wxTransformMatrix::TransformPoint(double x, double y, double& tx, double& ty) const
378 tx = x; ty = y; return true;
381 tx = x * m_matrix[0][0] + y * m_matrix[1][0] + m_matrix[2][0];
382 ty = x * m_matrix[0][1] + y * m_matrix[1][1] + m_matrix[2][1];
387 // Transform a point from device to logical coordinates.
390 // wxTransformMatrix mat = dc.GetTransformation();
392 // mat.InverseTransformPoint(x, y, x1, y1);
394 // dc.LogicalToDevice(x, y, x1, y1);
395 // The latter is slightly less efficient if we're doing several
396 // conversions, since the matrix is inverted several times.
397 bool wxTransformMatrix::InverseTransformPoint(double x, double y, double& tx, double& ty) const
406 const double z = (1.0 - m_matrix[0][2] * x - m_matrix[1][2] * y) / m_matrix[2][2];
407 if ( wxIsNullDouble(z) )
410 tx = x * m_matrix[0][0] + y * m_matrix[1][0] + z * m_matrix[2][0];
411 ty = x * m_matrix[0][1] + y * m_matrix[1][1] + z * m_matrix[2][1];
415 wxTransformMatrix& wxTransformMatrix::operator*=(const double& t)
417 for (int i = 0; i < 3; i++)
418 for (int j = 0; j < 3; j++)
420 m_isIdentity = IsIdentity1();
424 wxTransformMatrix& wxTransformMatrix::operator/=(const double& t)
426 for (int i = 0; i < 3; i++)
427 for (int j = 0; j < 3; j++)
429 m_isIdentity = IsIdentity1();
433 wxTransformMatrix& wxTransformMatrix::operator+=(const wxTransformMatrix& mat)
435 for (int i = 0; i < 3; i++)
436 for (int j = 0; j < 3; j++)
437 m_matrix[i][j] += mat.m_matrix[i][j];
438 m_isIdentity = IsIdentity1();
442 wxTransformMatrix& wxTransformMatrix::operator-=(const wxTransformMatrix& mat)
444 for (int i = 0; i < 3; i++)
445 for (int j = 0; j < 3; j++)
446 m_matrix[i][j] -= mat.m_matrix[i][j];
447 m_isIdentity = IsIdentity1();
451 wxTransformMatrix& wxTransformMatrix::operator*=(const wxTransformMatrix& mat)
454 if (mat.m_isIdentity)
463 wxTransformMatrix result;
464 for (int i = 0; i < 3; i++)
466 for (int j = 0; j < 3; j++)
469 for (int k = 0; k < 3; k++)
470 sum += m_matrix[k][i] * mat.m_matrix[j][k];
471 result.m_matrix[j][i] = sum;
477 m_isIdentity = IsIdentity1();
482 // constant operators
483 wxTransformMatrix wxTransformMatrix::operator*(const double& t) const
485 wxTransformMatrix result = *this;
487 result.m_isIdentity = result.IsIdentity1();
491 wxTransformMatrix wxTransformMatrix::operator/(const double& t) const
493 wxTransformMatrix result = *this;
496 result.m_isIdentity = result.IsIdentity1();
500 wxTransformMatrix wxTransformMatrix::operator+(const wxTransformMatrix& m) const
502 wxTransformMatrix result = *this;
504 result.m_isIdentity = result.IsIdentity1();
508 wxTransformMatrix wxTransformMatrix::operator-(const wxTransformMatrix& m) const
510 wxTransformMatrix result = *this;
512 result.m_isIdentity = result.IsIdentity1();
517 wxTransformMatrix wxTransformMatrix::operator*(const wxTransformMatrix& m) const
519 wxTransformMatrix result = *this;
521 result.m_isIdentity = result.IsIdentity1();
526 wxTransformMatrix wxTransformMatrix::operator-() const
528 wxTransformMatrix result = *this;
529 for (int i = 0; i < 3; i++)
530 for (int j = 0; j < 3; j++)
531 result.m_matrix[i][j] = -(this->m_matrix[i][j]);
532 result.m_isIdentity = result.IsIdentity1();
536 static double CheckInt(double getal)
538 // check if the number is very close to an integer
539 if ( (ceil(getal) - getal) < 0.0001)
542 else if ( (getal - floor(getal)) < 0.0001)
549 double wxTransformMatrix::Get_scaleX()
552 double rot_angle = CheckInt(atan2(m_matrix[1][0],m_matrix[0][0])*180/pi);
553 if ( !wxIsSameDouble(rot_angle, 90) && !wxIsSameDouble(rot_angle, -90) )
554 scale_factor = m_matrix[0][0]/cos((rot_angle/180)*pi);
556 scale_factor = m_matrix[0][0]/sin((rot_angle/180)*pi); // er kan nl. niet door 0 gedeeld worden !
558 scale_factor = CheckInt(scale_factor);
559 if (scale_factor < 0)
560 scale_factor = -scale_factor;
565 double wxTransformMatrix::Get_scaleY()
568 double rot_angle = CheckInt(atan2(m_matrix[1][0],m_matrix[0][0])*180/pi);
569 if ( !wxIsSameDouble(rot_angle, 90) && !wxIsSameDouble(rot_angle, -90) )
570 scale_factor = m_matrix[1][1]/cos((rot_angle/180)*pi);
572 scale_factor = m_matrix[1][1]/sin((rot_angle/180)*pi); // er kan nl. niet door 0 gedeeld worden !
574 scale_factor = CheckInt(scale_factor);
575 if (scale_factor < 0)
577 scale_factor = -scale_factor;
583 double wxTransformMatrix::GetRotation()
585 double temp1 = GetValue(0,0); // for angle calculation
586 double temp2 = GetValue(0,1); //
589 double rot_angle = atan2(temp2,temp1)*180/pi;
591 rot_angle = CheckInt(rot_angle);
595 void wxTransformMatrix::SetRotation(double rotation)
597 double x=GetValue(2,0);
598 double y=GetValue(2,1);
599 Rotate(-GetRotation(), x, y);
600 Rotate(rotation, x, y);