| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: common/dcbase.cpp |
| 3 | // Purpose: generic methods of the wxDC Class |
| 4 | // Author: Vadim Zeitlin |
| 5 | // Modified by: |
| 6 | // Created: 05/25/99 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) wxWindows team |
| 9 | // Licence: wxWindows license |
| 10 | ///////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | // ============================================================================ |
| 13 | // declarations |
| 14 | // ============================================================================ |
| 15 | |
| 16 | #ifdef __GNUG__ |
| 17 | #pragma implementation "dcbase.h" |
| 18 | #endif |
| 19 | |
| 20 | // ---------------------------------------------------------------------------- |
| 21 | // headers |
| 22 | // ---------------------------------------------------------------------------- |
| 23 | |
| 24 | // For compilers that support precompilation, includes "wx.h". |
| 25 | #include "wx/wxprec.h" |
| 26 | |
| 27 | #ifdef __BORLANDC__ |
| 28 | #pragma hdrstop |
| 29 | #endif |
| 30 | |
| 31 | #include "wx/dc.h" |
| 32 | |
| 33 | #include <math.h> |
| 34 | |
| 35 | // ============================================================================ |
| 36 | // implementation |
| 37 | // ============================================================================ |
| 38 | |
| 39 | // ---------------------------------------------------------------------------- |
| 40 | // special symbols |
| 41 | // ---------------------------------------------------------------------------- |
| 42 | |
| 43 | void wxDCBase::DoDrawCheckMark(wxCoord x1, wxCoord y1, |
| 44 | wxCoord width, wxCoord height) |
| 45 | { |
| 46 | wxCHECK_RET( Ok(), wxT("invalid window dc") ); |
| 47 | |
| 48 | wxCoord x2 = x1 + width, |
| 49 | y2 = y1 + height; |
| 50 | |
| 51 | // this is to yield width of 3 for width == height == 10 |
| 52 | SetPen(wxPen(GetTextForeground(), (width + height + 1) / 7, wxSOLID)); |
| 53 | |
| 54 | // we're drawing a scaled version of wx/generic/tick.xpm here |
| 55 | wxCoord x3 = x1 + (4*width) / 10, // x of the tick bottom |
| 56 | y3 = y1 + height / 2; // y of the left tick branch |
| 57 | DoDrawLine(x1, y3, x3, y2); |
| 58 | DoDrawLine(x3, y2, x2, y1); |
| 59 | |
| 60 | CalcBoundingBox(x1, y1); |
| 61 | CalcBoundingBox(x2, y2); |
| 62 | } |
| 63 | |
| 64 | // ---------------------------------------------------------------------------- |
| 65 | // line/polygons |
| 66 | // ---------------------------------------------------------------------------- |
| 67 | |
| 68 | void wxDCBase::DrawLines(const wxList *list, wxCoord xoffset, wxCoord yoffset) |
| 69 | { |
| 70 | int n = list->Number(); |
| 71 | wxPoint *points = new wxPoint[n]; |
| 72 | |
| 73 | int i = 0; |
| 74 | for ( wxNode *node = list->First(); node; node = node->Next(), i++ ) |
| 75 | { |
| 76 | wxPoint *point = (wxPoint *)node->Data(); |
| 77 | points[i].x = point->x; |
| 78 | points[i].y = point->y; |
| 79 | } |
| 80 | |
| 81 | DoDrawLines(n, points, xoffset, yoffset); |
| 82 | |
| 83 | delete [] points; |
| 84 | } |
| 85 | |
| 86 | |
| 87 | void wxDCBase::DrawPolygon(const wxList *list, |
| 88 | wxCoord xoffset, wxCoord yoffset, |
| 89 | int fillStyle) |
| 90 | { |
| 91 | int n = list->Number(); |
| 92 | wxPoint *points = new wxPoint[n]; |
| 93 | |
| 94 | int i = 0; |
| 95 | for ( wxNode *node = list->First(); node; node = node->Next(), i++ ) |
| 96 | { |
| 97 | wxPoint *point = (wxPoint *)node->Data(); |
| 98 | points[i].x = point->x; |
| 99 | points[i].y = point->y; |
| 100 | } |
| 101 | |
| 102 | DoDrawPolygon(n, points, xoffset, yoffset, fillStyle); |
| 103 | |
| 104 | delete [] points; |
| 105 | } |
| 106 | |
| 107 | // ---------------------------------------------------------------------------- |
| 108 | // splines |
| 109 | // ---------------------------------------------------------------------------- |
| 110 | |
| 111 | #if wxUSE_SPLINES |
| 112 | |
| 113 | // TODO: this API needs fixing (wxPointList, why (!const) "wxList *"?) |
| 114 | void wxDCBase::DrawSpline(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2, wxCoord x3, wxCoord y3) |
| 115 | { |
| 116 | wxList point_list; |
| 117 | |
| 118 | wxPoint *point1 = new wxPoint; |
| 119 | point1->x = x1; point1->y = y1; |
| 120 | point_list.Append((wxObject*)point1); |
| 121 | |
| 122 | wxPoint *point2 = new wxPoint; |
| 123 | point2->x = x2; point2->y = y2; |
| 124 | point_list.Append((wxObject*)point2); |
| 125 | |
| 126 | wxPoint *point3 = new wxPoint; |
| 127 | point3->x = x3; point3->y = y3; |
| 128 | point_list.Append((wxObject*)point3); |
| 129 | |
| 130 | DrawSpline(&point_list); |
| 131 | |
| 132 | for( wxNode *node = point_list.First(); node; node = node->Next() ) |
| 133 | { |
| 134 | wxPoint *p = (wxPoint *)node->Data(); |
| 135 | delete p; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | void wxDCBase::DrawSpline(int n, wxPoint points[]) |
| 140 | { |
| 141 | wxList list; |
| 142 | for (int i =0; i < n; i++) |
| 143 | { |
| 144 | list.Append((wxObject*)&points[i]); |
| 145 | } |
| 146 | |
| 147 | DrawSpline(&list); |
| 148 | } |
| 149 | |
| 150 | // ----------------------------------- spline code ---------------------------------------- |
| 151 | |
| 152 | void wx_quadratic_spline(double a1, double b1, double a2, double b2, |
| 153 | double a3, double b3, double a4, double b4); |
| 154 | void wx_clear_stack(); |
| 155 | int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3, |
| 156 | double *y3, double *x4, double *y4); |
| 157 | void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, |
| 158 | double x4, double y4); |
| 159 | static bool wx_spline_add_point(double x, double y); |
| 160 | static void wx_spline_draw_point_array(wxDCBase *dc); |
| 161 | |
| 162 | wxList wx_spline_point_list; |
| 163 | |
| 164 | #define half(z1, z2) ((z1+z2)/2.0) |
| 165 | #define THRESHOLD 5 |
| 166 | |
| 167 | /* iterative version */ |
| 168 | |
| 169 | void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4, |
| 170 | double b4) |
| 171 | { |
| 172 | register double xmid, ymid; |
| 173 | double x1, y1, x2, y2, x3, y3, x4, y4; |
| 174 | |
| 175 | wx_clear_stack(); |
| 176 | wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4); |
| 177 | |
| 178 | while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) { |
| 179 | xmid = (double)half(x2, x3); |
| 180 | ymid = (double)half(y2, y3); |
| 181 | if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD && |
| 182 | fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) { |
| 183 | wx_spline_add_point( x1, y1 ); |
| 184 | wx_spline_add_point( xmid, ymid ); |
| 185 | } else { |
| 186 | wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3), |
| 187 | (double)half(x3, x4), (double)half(y3, y4), x4, y4); |
| 188 | wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2), |
| 189 | (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid); |
| 190 | } |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | /* utilities used by spline drawing routines */ |
| 195 | |
| 196 | typedef struct wx_spline_stack_struct { |
| 197 | double x1, y1, x2, y2, x3, y3, x4, y4; |
| 198 | } Stack; |
| 199 | |
| 200 | #define SPLINE_STACK_DEPTH 20 |
| 201 | static Stack wx_spline_stack[SPLINE_STACK_DEPTH]; |
| 202 | static Stack *wx_stack_top; |
| 203 | static int wx_stack_count; |
| 204 | |
| 205 | void wx_clear_stack() |
| 206 | { |
| 207 | wx_stack_top = wx_spline_stack; |
| 208 | wx_stack_count = 0; |
| 209 | } |
| 210 | |
| 211 | void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4) |
| 212 | { |
| 213 | wx_stack_top->x1 = x1; |
| 214 | wx_stack_top->y1 = y1; |
| 215 | wx_stack_top->x2 = x2; |
| 216 | wx_stack_top->y2 = y2; |
| 217 | wx_stack_top->x3 = x3; |
| 218 | wx_stack_top->y3 = y3; |
| 219 | wx_stack_top->x4 = x4; |
| 220 | wx_stack_top->y4 = y4; |
| 221 | wx_stack_top++; |
| 222 | wx_stack_count++; |
| 223 | } |
| 224 | |
| 225 | int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, |
| 226 | double *x3, double *y3, double *x4, double *y4) |
| 227 | { |
| 228 | if (wx_stack_count == 0) |
| 229 | return (0); |
| 230 | wx_stack_top--; |
| 231 | wx_stack_count--; |
| 232 | *x1 = wx_stack_top->x1; |
| 233 | *y1 = wx_stack_top->y1; |
| 234 | *x2 = wx_stack_top->x2; |
| 235 | *y2 = wx_stack_top->y2; |
| 236 | *x3 = wx_stack_top->x3; |
| 237 | *y3 = wx_stack_top->y3; |
| 238 | *x4 = wx_stack_top->x4; |
| 239 | *y4 = wx_stack_top->y4; |
| 240 | return (1); |
| 241 | } |
| 242 | |
| 243 | static bool wx_spline_add_point(double x, double y) |
| 244 | { |
| 245 | wxPoint *point = new wxPoint ; |
| 246 | point->x = (int) x; |
| 247 | point->y = (int) y; |
| 248 | wx_spline_point_list.Append((wxObject*)point); |
| 249 | return TRUE; |
| 250 | } |
| 251 | |
| 252 | static void wx_spline_draw_point_array(wxDCBase *dc) |
| 253 | { |
| 254 | dc->DrawLines(&wx_spline_point_list, 0, 0 ); |
| 255 | wxNode *node = wx_spline_point_list.First(); |
| 256 | while (node) |
| 257 | { |
| 258 | wxPoint *point = (wxPoint *)node->Data(); |
| 259 | delete point; |
| 260 | delete node; |
| 261 | node = wx_spline_point_list.First(); |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | void wxDCBase::DoDrawSpline( wxList *points ) |
| 266 | { |
| 267 | wxCHECK_RET( Ok(), wxT("invalid window dc") ); |
| 268 | |
| 269 | wxPoint *p; |
| 270 | double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4; |
| 271 | double x1, y1, x2, y2; |
| 272 | |
| 273 | wxNode *node = points->First(); |
| 274 | p = (wxPoint *)node->Data(); |
| 275 | |
| 276 | x1 = p->x; |
| 277 | y1 = p->y; |
| 278 | |
| 279 | node = node->Next(); |
| 280 | p = (wxPoint *)node->Data(); |
| 281 | |
| 282 | x2 = p->x; |
| 283 | y2 = p->y; |
| 284 | cx1 = (double)((x1 + x2) / 2); |
| 285 | cy1 = (double)((y1 + y2) / 2); |
| 286 | cx2 = (double)((cx1 + x2) / 2); |
| 287 | cy2 = (double)((cy1 + y2) / 2); |
| 288 | |
| 289 | wx_spline_add_point(x1, y1); |
| 290 | |
| 291 | while ((node = node->Next()) != NULL) |
| 292 | { |
| 293 | p = (wxPoint *)node->Data(); |
| 294 | x1 = x2; |
| 295 | y1 = y2; |
| 296 | x2 = p->x; |
| 297 | y2 = p->y; |
| 298 | cx4 = (double)(x1 + x2) / 2; |
| 299 | cy4 = (double)(y1 + y2) / 2; |
| 300 | cx3 = (double)(x1 + cx4) / 2; |
| 301 | cy3 = (double)(y1 + cy4) / 2; |
| 302 | |
| 303 | wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4); |
| 304 | |
| 305 | cx1 = cx4; |
| 306 | cy1 = cy4; |
| 307 | cx2 = (double)(cx1 + x2) / 2; |
| 308 | cy2 = (double)(cy1 + y2) / 2; |
| 309 | } |
| 310 | |
| 311 | wx_spline_add_point( cx1, cy1 ); |
| 312 | wx_spline_add_point( x2, y2 ); |
| 313 | |
| 314 | wx_spline_draw_point_array( this ); |
| 315 | } |
| 316 | |
| 317 | #endif // wxUSE_SPLINES |
| 318 | |
| 319 | // ---------------------------------------------------------------------------- |
| 320 | // enhanced text drawing |
| 321 | // ---------------------------------------------------------------------------- |
| 322 | |
| 323 | void wxDCBase::GetMultiLineTextExtent(const wxString& text, |
| 324 | wxCoord *x, |
| 325 | wxCoord *y, |
| 326 | wxCoord *h, |
| 327 | wxFont *font) |
| 328 | { |
| 329 | int widthTextMax = 0, widthLine, |
| 330 | heightTextTotal = 0, heightLineDefault = 0, heightLine = 0; |
| 331 | |
| 332 | wxString curLine; |
| 333 | for ( const wxChar *pc = text; ; pc++ ) |
| 334 | { |
| 335 | if ( *pc == _T('\n') || *pc == _T('\0') ) |
| 336 | { |
| 337 | if ( curLine.empty() ) |
| 338 | { |
| 339 | // we can't use GetTextExtent - it will return 0 for both width |
| 340 | // and height and an empty line should count in height |
| 341 | // calculation |
| 342 | |
| 343 | // assume that this line has the same height as the previous |
| 344 | // one |
| 345 | if ( !heightLineDefault ) |
| 346 | heightLineDefault = heightLine; |
| 347 | |
| 348 | if ( !heightLineDefault ) |
| 349 | { |
| 350 | // but we don't know it yet - choose something reasonable |
| 351 | GetTextExtent(_T("W"), NULL, &heightLineDefault, |
| 352 | NULL, NULL, font); |
| 353 | } |
| 354 | |
| 355 | heightTextTotal += heightLineDefault; |
| 356 | } |
| 357 | else |
| 358 | { |
| 359 | GetTextExtent(curLine, &widthLine, &heightLine, |
| 360 | NULL, NULL, font); |
| 361 | if ( widthLine > widthTextMax ) |
| 362 | widthTextMax = widthLine; |
| 363 | heightTextTotal += heightLine; |
| 364 | } |
| 365 | |
| 366 | if ( *pc == _T('\n') ) |
| 367 | { |
| 368 | curLine.clear(); |
| 369 | } |
| 370 | else |
| 371 | { |
| 372 | // the end of string |
| 373 | break; |
| 374 | } |
| 375 | } |
| 376 | else |
| 377 | { |
| 378 | curLine += *pc; |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | if ( x ) |
| 383 | *x = widthTextMax; |
| 384 | if ( y ) |
| 385 | *y = heightTextTotal; |
| 386 | if ( h ) |
| 387 | *h = heightLine; |
| 388 | } |
| 389 | |
| 390 | void wxDCBase::DrawLabel(const wxString& text, |
| 391 | const wxBitmap& bitmap, |
| 392 | const wxRect& rect, |
| 393 | int alignment, |
| 394 | int indexAccel, |
| 395 | wxRect *rectBounding) |
| 396 | { |
| 397 | // find the text position |
| 398 | wxCoord widthText, heightText, heightLine; |
| 399 | GetMultiLineTextExtent(text, &widthText, &heightText, &heightLine); |
| 400 | |
| 401 | wxCoord width, height; |
| 402 | if ( bitmap.Ok() ) |
| 403 | { |
| 404 | width = widthText + bitmap.GetWidth(); |
| 405 | height = bitmap.GetHeight(); |
| 406 | } |
| 407 | else // no bitmap |
| 408 | { |
| 409 | width = widthText; |
| 410 | height = heightText; |
| 411 | } |
| 412 | |
| 413 | wxCoord x, y; |
| 414 | if ( alignment & wxALIGN_RIGHT ) |
| 415 | { |
| 416 | x = rect.GetRight() - width; |
| 417 | } |
| 418 | else if ( alignment & wxALIGN_CENTRE_HORIZONTAL ) |
| 419 | { |
| 420 | x = (rect.GetLeft() + rect.GetRight() + 1 - width) / 2; |
| 421 | } |
| 422 | else // alignment & wxALIGN_LEFT |
| 423 | { |
| 424 | x = rect.GetLeft(); |
| 425 | } |
| 426 | |
| 427 | if ( alignment & wxALIGN_BOTTOM ) |
| 428 | { |
| 429 | y = rect.GetBottom() - height; |
| 430 | } |
| 431 | else if ( alignment & wxALIGN_CENTRE_VERTICAL ) |
| 432 | { |
| 433 | y = (rect.GetTop() + rect.GetBottom() + 1 - height) / 2; |
| 434 | } |
| 435 | else // alignment & wxALIGN_TOP |
| 436 | { |
| 437 | y = rect.GetTop(); |
| 438 | } |
| 439 | |
| 440 | // draw the bitmap first |
| 441 | wxCoord x0 = x, |
| 442 | y0 = y, |
| 443 | width0 = width; |
| 444 | if ( bitmap.Ok() ) |
| 445 | { |
| 446 | DrawBitmap(bitmap, x, y, TRUE /* use mask */); |
| 447 | |
| 448 | wxCoord offset = bitmap.GetWidth() + 4; |
| 449 | x += offset; |
| 450 | width -= offset; |
| 451 | |
| 452 | y += (height - heightText) / 2; |
| 453 | } |
| 454 | |
| 455 | // we will draw the underscore under the accel char later |
| 456 | wxCoord startUnderscore = 0, |
| 457 | endUnderscore = 0, |
| 458 | yUnderscore = 0; |
| 459 | |
| 460 | // split the string into lines and draw each of them separately |
| 461 | wxString curLine; |
| 462 | for ( const wxChar *pc = text; ; pc++ ) |
| 463 | { |
| 464 | if ( *pc == _T('\n') || *pc == _T('\0') ) |
| 465 | { |
| 466 | int xRealStart = x; // init it here to avoid compielr warnings |
| 467 | |
| 468 | if ( !curLine.empty() ) |
| 469 | { |
| 470 | // NB: can't test for !(alignment & wxALIGN_LEFT) because |
| 471 | // wxALIGN_LEFT is 0 |
| 472 | if ( alignment & (wxALIGN_RIGHT | wxALIGN_CENTRE_HORIZONTAL) ) |
| 473 | { |
| 474 | wxCoord widthLine; |
| 475 | GetTextExtent(curLine, &widthLine, NULL); |
| 476 | |
| 477 | if ( alignment & wxALIGN_RIGHT ) |
| 478 | { |
| 479 | xRealStart += width - widthLine; |
| 480 | } |
| 481 | else // if ( alignment & wxALIGN_CENTRE_HORIZONTAL ) |
| 482 | { |
| 483 | xRealStart += (width - widthLine) / 2; |
| 484 | } |
| 485 | } |
| 486 | //else: left aligned, nothing to do |
| 487 | |
| 488 | DrawText(curLine, xRealStart, y); |
| 489 | } |
| 490 | |
| 491 | y += heightLine; |
| 492 | |
| 493 | // do we have underscore in this line? we can check yUnderscore |
| 494 | // because it is set below to just y + heightLine if we do |
| 495 | if ( y == yUnderscore ) |
| 496 | { |
| 497 | // adjust the horz positions to account for the shift |
| 498 | startUnderscore += xRealStart; |
| 499 | endUnderscore += xRealStart; |
| 500 | } |
| 501 | |
| 502 | if ( *pc == _T('\0') ) |
| 503 | break; |
| 504 | |
| 505 | curLine.clear(); |
| 506 | } |
| 507 | else // not end of line |
| 508 | { |
| 509 | if ( pc - text == indexAccel ) |
| 510 | { |
| 511 | // remeber to draw underscore here |
| 512 | GetTextExtent(curLine, &startUnderscore, NULL); |
| 513 | curLine += *pc; |
| 514 | GetTextExtent(curLine, &endUnderscore, NULL); |
| 515 | |
| 516 | yUnderscore = y + heightLine; |
| 517 | } |
| 518 | else |
| 519 | { |
| 520 | curLine += *pc; |
| 521 | } |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | // draw the underscore if found |
| 526 | if ( startUnderscore != endUnderscore ) |
| 527 | { |
| 528 | // it should be of the same colour as text |
| 529 | SetPen(wxPen(GetTextForeground(), 0, wxSOLID)); |
| 530 | |
| 531 | yUnderscore--; |
| 532 | |
| 533 | DrawLine(startUnderscore, yUnderscore, endUnderscore, yUnderscore); |
| 534 | } |
| 535 | |
| 536 | // return bounding rect if requested |
| 537 | if ( rectBounding ) |
| 538 | { |
| 539 | *rectBounding = wxRect(x, y - heightText, widthText, heightText); |
| 540 | } |
| 541 | |
| 542 | CalcBoundingBox(x0, y0); |
| 543 | CalcBoundingBox(x0 + width0, y0 + height); |
| 544 | } |