src/common/matrix.cpp

   1 // Name:        matrix.cpp
   2 // Purpose:     wxTransformMatrix class
   3 // Author:      Chris Breeze, Julian Smart
   4 // Modified by: Klaas Holwerda
   5 // Created:     01/02/97
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) Julian Smart and Markus Holzem
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #ifdef __GNUG__
  12 #pragma implementation "matrix.h"
  13 #endif
  14
  15 // Note: this is intended to be used in wxDC at some point to replace
  16 // the current system of scaling/translation. It is not yet used.
  17
  18 // For compilers that support precompilation, includes "wx.h".
  19 #include "wx/wxprec.h"
  20
  21 #ifdef __BORLANDC__
  22 #pragma hdrstop
  23 #endif
  24
  25 #ifndef WX_PRECOMP
  26 #include "wx/defs.h"
  27 #endif
  28
  29 #include "wx/matrix.h"
  30 #include <math.h>
  31
  32 #if ! (defined(__WXMAC__) && defined(__UNIX__))
  33 const double pi = 3.1415926535;
  34 #endif
  35
  36 wxTransformMatrix::wxTransformMatrix(void)
  37 {
  38     m_isIdentity = FALSE;
  39
  40     Identity();
  41 }
  42
  43 wxTransformMatrix::wxTransformMatrix(const wxTransformMatrix& mat)
  44 {
  45     (*this) = mat;
  46 }
  47
  48 double wxTransformMatrix::GetValue(int col, int row) const
  49 {
  50     if (row < 0 || row > 2 || col < 0 || col > 2)
  51         return 0.0;
  52
  53     return m_matrix[col][row];
  54 }
  55
  56 void wxTransformMatrix::SetValue(int col, int row, double value)
  57 {
  58     if (row < 0 || row > 2 || col < 0 || col > 2)
  59         return;
  60
  61     m_matrix[col][row] = value;
  62     m_isIdentity = IsIdentity1();
  63 }
  64
  65 void wxTransformMatrix::operator = (const wxTransformMatrix& mat)
  66 {
  67     int i, j;
  68     for (i = 0; i < 3; i++)
  69     {
  70         for (j = 0; j < 3; j++)
  71         {
  72             m_matrix[i][j] = mat.m_matrix[i][j];
  73         }
  74     }
  75     m_isIdentity = mat.m_isIdentity;
  76 }
  77
  78 bool wxTransformMatrix::operator == (const wxTransformMatrix& mat)
  79 {
  80     if (m_isIdentity==TRUE && mat.m_isIdentity==TRUE)
  81         return TRUE;
  82
  83     int i, j;
  84     for (i = 0; i < 3; i++)
  85     {
  86         for (j = 0; j < 3; j++)
  87         {
  88             if (m_matrix[i][j] != mat.m_matrix[i][j])
  89                 return FALSE;
  90         }
  91     }
  92     return TRUE;
  93 }
  94
  95 bool wxTransformMatrix::operator != (const wxTransformMatrix& mat)
  96 {
  97     return (! ((*this) == mat));
  98 }
  99
 100 double& wxTransformMatrix::operator()(int col, int row)
 101 {
 102     if (row < 0 || row > 2 || col < 0 || col > 2)
 103         return m_matrix[0][0];
 104
 105     return m_matrix[col][row];
 106 }
 107
 108 double wxTransformMatrix::operator()(int col, int row) const
 109 {
 110     if (row < 0 || row > 2 || col < 0 || col > 2)
 111         return 0.0;
 112
 113     return m_matrix[col][row];
 114 }
 115
 116 // Invert matrix
 117 bool wxTransformMatrix::Invert(void)
 118 {
 119     double inverseMatrix[3][3];
 120
 121     // calculate the adjoint
 122     inverseMatrix[0][0] =  wxCalculateDet(m_matrix[1][1],m_matrix[2][1],m_matrix[1][2],m_matrix[2][2]);
 123     inverseMatrix[0][1] = -wxCalculateDet(m_matrix[0][1],m_matrix[2][1],m_matrix[0][2],m_matrix[2][2]);
 124     inverseMatrix[0][2] =  wxCalculateDet(m_matrix[0][1],m_matrix[1][1],m_matrix[0][2],m_matrix[1][2]);
 125
 126     inverseMatrix[1][0] = -wxCalculateDet(m_matrix[1][0],m_matrix[2][0],m_matrix[1][2],m_matrix[2][2]);
 127     inverseMatrix[1][1] =  wxCalculateDet(m_matrix[0][0],m_matrix[2][0],m_matrix[0][2],m_matrix[2][2]);
 128     inverseMatrix[1][2] = -wxCalculateDet(m_matrix[0][0],m_matrix[1][0],m_matrix[0][2],m_matrix[1][2]);
 129
 130     inverseMatrix[2][0] =  wxCalculateDet(m_matrix[1][0],m_matrix[2][0],m_matrix[1][1],m_matrix[2][1]);
 131     inverseMatrix[2][1] = -wxCalculateDet(m_matrix[0][0],m_matrix[2][0],m_matrix[0][1],m_matrix[2][1]);
 132     inverseMatrix[2][2] =  wxCalculateDet(m_matrix[0][0],m_matrix[1][0],m_matrix[0][1],m_matrix[1][1]);
 133
 134     // now divide by the determinant
 135     double det = m_matrix[0][0] * inverseMatrix[0][0] + m_matrix[0][1] * inverseMatrix[1][0] + m_matrix[0][2] * inverseMatrix[2][0];
 136     if (det != 0.0)
 137     {
 138         inverseMatrix[0][0] /= det; inverseMatrix[1][0] /= det; inverseMatrix[2][0] /= det;
 139         inverseMatrix[0][1] /= det; inverseMatrix[1][1] /= det; inverseMatrix[2][1] /= det;
 140         inverseMatrix[0][2] /= det; inverseMatrix[1][2] /= det; inverseMatrix[2][2] /= det;
 141
 142         int i, j;
 143         for (i = 0; i < 3; i++)
 144         {
 145             for (j = 0; j < 3; j++)
 146             {
 147                 m_matrix[i][j] = inverseMatrix[i][j];
 148             }
 149         }
 150         m_isIdentity = IsIdentity1();
 151         return TRUE;
 152     }
 153     else
 154     {
 155         return FALSE;
 156     }
 157 }
 158
 159 // Make into identity matrix
 160 bool wxTransformMatrix::Identity(void)
 161 {
 162     m_matrix[0][0] = m_matrix[1][1] = m_matrix[2][2] = 1.0;
 163     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;
 164     m_isIdentity = TRUE;
 165
 166     return TRUE;
 167 }
 168
 169 // Scale by scale (isotropic scaling i.e. the same in x and y):
 170 //           | scale  0      0      |
 171 // matrix' = |  0     scale  0      | x matrix
 172 //           |  0     0      scale  |
 173 //
 174 bool wxTransformMatrix::Scale(double scale)
 175 {
 176     int i, j;
 177     for (i = 0; i < 3; i++)
 178     {
 179         for (j = 0; j < 3; j++)
 180         {
 181             m_matrix[i][j] *= scale;
 182         }
 183     }
 184     m_isIdentity = IsIdentity1();
 185
 186     return TRUE;
 187 }
 188
 189
 190 // scale a matrix in 2D
 191 //
 192 //     xs    0      xc(1-xs)
 193 //     0    ys      yc(1-ys)
 194 //     0     0      1
 195 //
 196 wxTransformMatrix&  wxTransformMatrix::Scale(const double &xs, const double &ys,const double &xc, const double &yc)
 197 {
 198     double r00,r10,r20,r01,r11,r21;
 199
 200     if (m_isIdentity)
 201     {
 202         double tx  =xc*(1-xs);
 203         double ty  =yc*(1-ys);
 204         r00 = xs;
 205         r10 = 0;
 206         r20 = tx;
 207         r01 = 0;
 208         r11 = ys;
 209         r21 = ty;
 210     }
 211     else if (xc!=0 || yc!=0)
 212     {
 213         double tx  =xc*(1-xs);
 214         double ty  =yc*(1-ys);
 215         r00 = xs * m_matrix[0][0];
 216         r10 = xs * m_matrix[1][0];
 217         r20 = xs * m_matrix[2][0] + tx;
 218         r01 = ys * m_matrix[0][1];
 219         r11 = ys * m_matrix[1][1];
 220         r21 = ys * m_matrix[2][1] + ty;
 221     }
 222     else
 223     {
 224         r00 = xs * m_matrix[0][0];
 225         r10 = xs * m_matrix[1][0];
 226         r20 = xs * m_matrix[2][0];
 227         r01 = ys * m_matrix[0][1];
 228         r11 = ys * m_matrix[1][1];
 229         r21 = ys * m_matrix[2][1];
 230     }
 231
 232     m_matrix[0][0] = r00;
 233     m_matrix[1][0] = r10;
 234     m_matrix[2][0] = r20;
 235     m_matrix[0][1] = r01;
 236     m_matrix[1][1] = r11;
 237     m_matrix[2][1] = r21;
 238
 239 /* or like this
 240     // first translate to origin O
 241     (*this).Translate(-x_cen, -y_cen);
 242
 243     // now do the scaling
 244     wxTransformMatrix scale;
 245     scale.m_matrix[0][0] = x_fac;
 246     scale.m_matrix[1][1] = y_fac;
 247    scale.m_isIdentity = IsIdentity1();
 248
 249     *this = scale * (*this);
 250
 251     // translate back from origin to x_cen, y_cen
 252     (*this).Translate(x_cen, y_cen);
 253 */
 254
 255     m_isIdentity = IsIdentity1();
 256
 257     return *this;
 258 }
 259
 260
 261 // mirror a matrix in x, y
 262 //
 263 //     -1      0      0     Y-mirror
 264 //      0     -1      0     X-mirror
 265 //      0      0     -1     Z-mirror
 266 wxTransformMatrix&  wxTransformMatrix::Mirror(bool x, bool y)
 267 {
 268     wxTransformMatrix temp;
 269     if (x)
 270     {
 271         temp.m_matrix[1][1] = -1;
 272         temp.m_isIdentity=FALSE;
 273     }
 274     if (y)
 275     {
 276         temp.m_matrix[0][0] = -1;
 277         temp.m_isIdentity=FALSE;
 278     }
 279
 280     *this = temp * (*this);
 281     m_isIdentity = IsIdentity1();
 282     return *this;
 283 }
 284
 285 // Translate by dx, dy:
 286 //           | 1  0 dx |
 287 // matrix' = | 0  1 dy | x matrix
 288 //           | 0  0  1 |
 289 //
 290 bool wxTransformMatrix::Translate(double dx, double dy)
 291 {
 292     int i;
 293     for (i = 0; i < 3; i++)
 294         m_matrix[i][0] += dx * m_matrix[i][2];
 295     for (i = 0; i < 3; i++)
 296         m_matrix[i][1] += dy * m_matrix[i][2];
 297
 298     m_isIdentity = IsIdentity1();
 299
 300     return TRUE;
 301 }
 302
 303 // Rotate clockwise by the given number of degrees:
 304 //           |  cos sin 0 |
 305 // matrix' = | -sin cos 0 | x matrix
 306 //           |   0   0  1 |
 307 bool wxTransformMatrix::Rotate(double degrees)
 308 {
 309     Rotate(-degrees,0,0);
 310     return TRUE;
 311 }
 312
 313 // counter clockwise rotate around a point
 314 //
 315 //  cos(r) -sin(r)    x(1-cos(r))+y(sin(r)
 316 //  sin(r)  cos(r)    y(1-cos(r))-x(sin(r)
 317 //    0      0        1
 318 wxTransformMatrix&  wxTransformMatrix::Rotate(const double &degrees, const double &x, const double &y)
 319 {
 320     double angle = degrees * pi / 180.0;
 321     double c = cos(angle);
 322     double s = sin(angle);
 323     double r00,r10,r20,r01,r11,r21;
 324
 325     if (m_isIdentity)
 326     {
 327         double tx  = x*(1-c)+y*s;
 328         double ty  = y*(1-c)-x*s;
 329         r00 = c ;
 330         r10 = -s;
 331         r20 = tx;
 332         r01 = s;
 333         r11 = c;
 334         r21 = ty;
 335     }
 336     else if (x!=0 || y!=0)
 337     {
 338         double tx  = x*(1-c)+y*s;
 339         double ty  = y*(1-c)-x*s;
 340         r00 = c * m_matrix[0][0] - s * m_matrix[0][1] + tx * m_matrix[0][2];
 341         r10 = c * m_matrix[1][0] - s * m_matrix[1][1] + tx * m_matrix[1][2];
 342         r20 = c * m_matrix[2][0] - s * m_matrix[2][1] + tx;// * m_matrix[2][2];
 343         r01 = c * m_matrix[0][1] + s * m_matrix[0][0] + ty * m_matrix[0][2];
 344         r11 = c * m_matrix[1][1] + s * m_matrix[1][0] + ty * m_matrix[1][2];
 345         r21 = c * m_matrix[2][1] + s * m_matrix[2][0] + ty;// * m_matrix[2][2];
 346     }
 347     else
 348     {
 349         r00 = c * m_matrix[0][0] - s * m_matrix[0][1];
 350         r10 = c * m_matrix[1][0] - s * m_matrix[1][1];
 351         r20 = c * m_matrix[2][0] - s * m_matrix[2][1];
 352         r01 = c * m_matrix[0][1] + s * m_matrix[0][0];
 353         r11 = c * m_matrix[1][1] + s * m_matrix[1][0];
 354         r21 = c * m_matrix[2][1] + s * m_matrix[2][0];
 355     }
 356
 357     m_matrix[0][0] = r00;
 358     m_matrix[1][0] = r10;
 359     m_matrix[2][0] = r20;
 360     m_matrix[0][1] = r01;
 361     m_matrix[1][1] = r11;
 362     m_matrix[2][1] = r21;
 363
 364 /* or like this
 365     wxTransformMatrix rotate;
 366     rotate.m_matrix[2][0] = tx;
 367     rotate.m_matrix[2][1] = ty;
 368
 369     rotate.m_matrix[0][0] = c;
 370     rotate.m_matrix[0][1] = s;
 371
 372     rotate.m_matrix[1][0] = -s;
 373     rotate.m_matrix[1][1] = c;
 374
 375    rotate.m_isIdentity=false;
 376    *this = rotate * (*this);
 377 */
 378     m_isIdentity = IsIdentity1();
 379
 380     return *this;
 381 }
 382
 383 // Transform a point from logical to device coordinates
 384 bool wxTransformMatrix::TransformPoint(double x, double y, double& tx, double& ty) const
 385 {
 386     if (IsIdentity())
 387     {
 388         tx = x; ty = y; return TRUE;
 389     }
 390
 391     tx = x * m_matrix[0][0] + y * m_matrix[1][0] + m_matrix[2][0];
 392     ty = x * m_matrix[0][1] + y * m_matrix[1][1] + m_matrix[2][1];
 393
 394     return TRUE;
 395 }
 396
 397 // Transform a point from device to logical coordinates.
 398
 399 // Example of use:
 400 //   wxTransformMatrix mat = dc.GetTransformation();
 401 //   mat.Invert();
 402 //   mat.InverseTransformPoint(x, y, x1, y1);
 403 // OR (shorthand:)
 404 //   dc.LogicalToDevice(x, y, x1, y1);
 405 // The latter is slightly less efficient if we're doing several
 406 // conversions, since the matrix is inverted several times.
 407 bool wxTransformMatrix::InverseTransformPoint(double x, double y, double& tx, double& ty) const
 408 {
 409     if (IsIdentity())
 410     {
 411         tx = x; ty = y; return TRUE;
 412     }
 413
 414     double z = (1.0 - m_matrix[0][2] * x - m_matrix[1][2] * y) / m_matrix[2][2];
 415     if (z == 0.0)
 416     {
 417 //      z = 0.0000001;
 418         return FALSE;
 419     }
 420     tx = x * m_matrix[0][0] + y * m_matrix[1][0] + z * m_matrix[2][0];
 421     ty = x * m_matrix[0][1] + y * m_matrix[1][1] + z * m_matrix[2][1];
 422     return TRUE;
 423 }
 424
 425 wxTransformMatrix& wxTransformMatrix::operator*=(const double& t)
 426 {
 427     for (int i = 0; i < 3; i++)
 428         for (int j = 0; j < 3; j++)
 429             m_matrix[i][j]*= t;
 430     m_isIdentity = IsIdentity1();
 431     return *this;
 432 }
 433
 434 wxTransformMatrix& wxTransformMatrix::operator/=(const double& t)
 435 {
 436     for (int i = 0; i < 3; i++)
 437         for (int j = 0; j < 3; j++)
 438             m_matrix[i][j]/= t;
 439     m_isIdentity = IsIdentity1();
 440     return *this;
 441 }
 442
 443 wxTransformMatrix& wxTransformMatrix::operator+=(const wxTransformMatrix& mat)
 444 {
 445     for (int i = 0; i < 3; i++)
 446         for (int j = 0; j < 3; j++)
 447             m_matrix[i][j] += mat.m_matrix[i][j];
 448     m_isIdentity = IsIdentity1();
 449     return *this;
 450 }
 451
 452 wxTransformMatrix& wxTransformMatrix::operator-=(const wxTransformMatrix& mat)
 453 {
 454     for (int i = 0; i < 3; i++)
 455         for (int j = 0; j < 3; j++)
 456             m_matrix[i][j] -= mat.m_matrix[i][j];
 457     m_isIdentity = IsIdentity1();
 458     return *this;
 459 }
 460
 461 wxTransformMatrix& wxTransformMatrix::operator*=(const wxTransformMatrix& mat)
 462 {
 463
 464     if (mat.m_isIdentity)
 465         return *this;
 466     if (m_isIdentity)
 467     {
 468         *this = mat;
 469         return *this;
 470     }
 471     else
 472     {
 473         wxTransformMatrix  result;
 474         for (int i = 0; i < 3; i++)
 475         {
 476            for (int j = 0; j < 3; j++)
 477            {
 478                double sum = 0;
 479                for (int k = 0; k < 3; k++)
 480                    sum += m_matrix[k][i] * mat.m_matrix[j][k];
 481                result.m_matrix[j][i] = sum;
 482            }
 483         }
 484         *this = result;
 485     }
 486
 487     m_isIdentity = IsIdentity1();
 488     return *this;
 489 }
 490
 491
 492 // constant operators
 493 wxTransformMatrix  wxTransformMatrix::operator*(const double& t) const
 494 {
 495     wxTransformMatrix result = *this;
 496     result *= t;
 497     result.m_isIdentity = result.IsIdentity1();
 498     return result;
 499 }
 500
 501 wxTransformMatrix  wxTransformMatrix::operator/(const double& t) const
 502 {
 503     wxTransformMatrix result = *this;
 504 //    wxASSERT(t!=0);
 505     result /= t;
 506     result.m_isIdentity = result.IsIdentity1();
 507     return result;
 508 }
 509
 510 wxTransformMatrix  wxTransformMatrix::operator+(const wxTransformMatrix& m) const
 511 {
 512     wxTransformMatrix result = *this;
 513     result += m;
 514     result.m_isIdentity = result.IsIdentity1();
 515     return result;
 516 }
 517
 518 wxTransformMatrix  wxTransformMatrix::operator-(const wxTransformMatrix& m) const
 519 {
 520     wxTransformMatrix result = *this;
 521     result -= m;
 522     result.m_isIdentity = result.IsIdentity1();
 523     return result;
 524 }
 525
 526
 527 wxTransformMatrix  wxTransformMatrix::operator*(const wxTransformMatrix& m) const
 528 {
 529     wxTransformMatrix result = *this;
 530     result *= m;
 531     result.m_isIdentity = result.IsIdentity1();
 532     return result;
 533 }
 534
 535
 536 wxTransformMatrix  wxTransformMatrix::operator-() const
 537 {
 538     wxTransformMatrix result = *this;
 539     for (int i = 0; i < 3; i++)
 540         for (int j = 0; j < 3; j++)
 541             result.m_matrix[i][j] = -(this->m_matrix[i][j]);
 542     result.m_isIdentity = result.IsIdentity1();
 543     return result;
 544 }
 545
 546 static double CheckInt(double getal)
 547 {
 548     // check if the number is very close to an integer
 549     if ( (ceil(getal) - getal) < 0.0001)
 550         return ceil(getal);
 551
 552     else if ( (getal - floor(getal)) < 0.0001)
 553         return floor(getal);
 554
 555     return getal;
 556
 557 }
 558
 559 double wxTransformMatrix::Get_scaleX()
 560 {
 561     double scale_factor;
 562     double rot_angle = CheckInt(atan2(m_matrix[1][0],m_matrix[0][0])*180/pi);
 563     if (rot_angle != 90 && rot_angle != -90)
 564         scale_factor = m_matrix[0][0]/cos((rot_angle/180)*pi);
 565     else
 566         scale_factor = m_matrix[0][0]/sin((rot_angle/180)*pi);  // er kan nl. niet door 0 gedeeld worden !
 567
 568     scale_factor = CheckInt(scale_factor);
 569     if (scale_factor < 0)
 570         scale_factor = -scale_factor;
 571
 572     return scale_factor;
 573 }
 574
 575 double wxTransformMatrix::Get_scaleY()
 576 {
 577     double scale_factor;
 578     double rot_angle = CheckInt(atan2(m_matrix[1][0],m_matrix[0][0])*180/pi);
 579     if (rot_angle != 90 && rot_angle != -90)
 580        scale_factor = m_matrix[1][1]/cos((rot_angle/180)*pi);
 581     else
 582        scale_factor = m_matrix[1][1]/sin((rot_angle/180)*pi);   // er kan nl. niet door 0 gedeeld worden !
 583
 584     scale_factor = CheckInt(scale_factor);
 585     if (scale_factor < 0)
 586
 587         scale_factor = -scale_factor;
 588
 589     return scale_factor;
 590
 591 }
 592
 593 double wxTransformMatrix::GetRotation()
 594 {
 595     double temp1 = GetValue(0,0);   // for angle calculation
 596     double temp2 = GetValue(0,1);   //
 597
 598     // Rotation
 599     double rot_angle = atan2(temp2,temp1)*180/pi;
 600
 601     rot_angle = CheckInt(rot_angle);
 602     return rot_angle;
 603 }
 604
 605 void wxTransformMatrix::SetRotation(double rotation)
 606 {
 607     double x=GetValue(2,0);
 608     double y=GetValue(2,1);
 609     Rotate(-GetRotation(), x, y);
 610     Rotate(rotation, x, y);
 611 }
 612