src/mgl/region.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:      region.cpp
   3 // Purpose:   Region handling for wxWindows/MGL
   4 // Author:    Vaclav Slavik
   5 // RCS-ID:    $Id$
   6 // Copyright: (c) 2001-2002 SciTech Software, Inc. (www.scitechsoft.com)
   7 // Licence:   wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __GNUG__
  11 #pragma implementation "region.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18 #pragma hdrstop
  19 #endif
  20
  21 #include "wx/region.h"
  22 #include "wx/gdicmn.h"
  23 #include "wx/thread.h"
  24 #include "wx/module.h"
  25
  26 #include <mgraph.hpp>
  27
  28 #include "wx/listimpl.cpp"
  29 WX_DEFINE_LIST(wxRegionRectList)
  30
  31 IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
  32 IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator, wxObject)
  33
  34 //-----------------------------------------------------------------------------
  35 // wxRegionRefData implementation
  36 //-----------------------------------------------------------------------------
  37
  38 class WXDLLEXPORT wxRegionRefData : public wxGDIRefData
  39 {
  40 public:
  41     wxRegionRefData() {}
  42
  43     wxRegionRefData(const wxRegionRefData& data)
  44     {
  45         m_region = data.m_region;
  46     }
  47
  48     ~wxRegionRefData() {}
  49
  50     MGLRegion m_region;
  51 };
  52
  53 #define M_REGION       (((wxRegionRefData*)m_refData)->m_region)
  54 #define M_REGION_OF(r) (((wxRegionRefData*)(r.m_refData))->m_region)
  55
  56 //-----------------------------------------------------------------------------
  57 // wxRegion
  58 //-----------------------------------------------------------------------------
  59
  60 wxObjectRefData *wxRegion::CreateRefData() const
  61 {
  62     return new wxRegionRefData;
  63 }
  64
  65 wxObjectRefData *wxRegion::CloneRefData(const wxObjectRefData *data) const
  66 {
  67     return new wxRegionRefData(*(wxRegionRefData *)data);
  68 }
  69
  70 /*
  71  * Create an empty region.
  72  */
  73 wxRegion::wxRegion()
  74 {
  75     m_refData = NULL;
  76 }
  77
  78 wxRegion::wxRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
  79 {
  80     m_refData = new wxRegionRefData;
  81     MGLRect rect(x, y, x + w, y + h);
  82     M_REGION = rect;
  83 }
  84
  85 wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
  86 {
  87     m_refData = new wxRegionRefData;
  88     MGLRect rect(topLeft.x, topLeft.y, bottomRight.x+1, bottomRight.y+1);
  89     M_REGION = rect;
  90 }
  91
  92 wxRegion::wxRegion(const wxRect& r)
  93 {
  94     m_refData = new wxRegionRefData;
  95     MGLRect rect(r.GetLeft(), r.GetTop(), r.GetRight()+1, r.GetBottom()+1);
  96     M_REGION = rect;
  97 }
  98
  99 wxRegion::wxRegion(const MGLRegion& region)
 100 {
 101     m_refData = new wxRegionRefData;
 102     M_REGION = region;
 103 }
 104
 105 wxRegion::~wxRegion()
 106 {
 107     // m_refData unrefed in ~wxObject
 108 }
 109
 110 const MGLRegion& wxRegion::GetMGLRegion() const
 111 {
 112     return M_REGION;
 113 }
 114
 115 //-----------------------------------------------------------------------------
 116 // Modify region
 117 //-----------------------------------------------------------------------------
 118
 119 // Clear current region
 120 void wxRegion::Clear()
 121 {
 122     UnRef();
 123 }
 124
 125
 126 //-----------------------------------------------------------------------------
 127 // Information on region
 128 //-----------------------------------------------------------------------------
 129
 130 // Outer bounds of region
 131 void wxRegion::GetBox(wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h) const
 132 {
 133     if (m_refData)
 134     {
 135         rect_t rect;
 136         rect = M_REGION.getBounds();
 137         x = rect.left;
 138         y = rect.top;
 139         w = rect.right - rect.left;
 140         h = rect.bottom - rect.top;
 141     }
 142     else
 143     {
 144         x = y = w = h = 0;
 145     }
 146 }
 147
 148 wxRect wxRegion::GetBox() const
 149 {
 150     wxCoord x, y, w, h;
 151     GetBox(x, y, w, h);
 152     return wxRect(x, y, w, h);
 153 }
 154
 155 // Is region empty?
 156 bool wxRegion::Empty() const
 157 {
 158     if (!m_refData) return TRUE;
 159     return M_REGION.isEmpty();
 160 }
 161
 162 //-----------------------------------------------------------------------------
 163 // Modifications
 164 //-----------------------------------------------------------------------------
 165
 166 bool wxRegion::Offset(wxCoord x, wxCoord y)
 167 {
 168     AllocExclusive();
 169     M_REGION.offset(x, y);
 170     return TRUE;
 171 }
 172
 173 // Union rectangle or region with this.
 174 bool wxRegion::Union(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 175 {
 176     AllocExclusive();
 177     M_REGION += MGLRect(x, y, x + width, y + height);
 178     return TRUE;
 179 }
 180
 181 bool wxRegion::Union(const wxRegion& region)
 182 {
 183     AllocExclusive();
 184     M_REGION += M_REGION_OF(region);
 185     return TRUE;
 186 }
 187
 188 // Intersect rectangle or region with this.
 189 bool wxRegion::Intersect(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 190 {
 191     AllocExclusive();
 192     M_REGION &= MGLRect(x, y, x + width, y + height);
 193     return TRUE;
 194 }
 195
 196 bool wxRegion::Intersect(const wxRegion& region)
 197 {
 198     AllocExclusive();
 199     M_REGION &= M_REGION_OF(region);
 200     return TRUE;
 201 }
 202
 203 // Subtract rectangle or region from this:
 204 // Combines the parts of 'this' that are not part of the second region.
 205 bool wxRegion::Subtract(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 206 {
 207     AllocExclusive();
 208     M_REGION -= MGLRect(x, y, x + width, y + height);
 209     return TRUE;
 210 }
 211
 212 bool wxRegion::Subtract(const wxRegion& region)
 213 {
 214     AllocExclusive();
 215     M_REGION -= M_REGION_OF(region);
 216     return TRUE;
 217 }
 218
 219 // XOR: the union of two combined regions except for any overlapping areas.
 220 bool wxRegion::Xor(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 221 {
 222     AllocExclusive();
 223     MGLRect rect(x, y, x + width, y + height);
 224     MGLRegion rg1 = M_REGION + rect,
 225               rg2 = M_REGION & rect;
 226     M_REGION = rg1 - rg2;
 227     return TRUE;
 228 }
 229
 230 bool wxRegion::Xor(const wxRegion& region)
 231 {
 232     AllocExclusive();
 233     MGLRegion rg1 = M_REGION + M_REGION_OF(region),
 234               rg2 = M_REGION & M_REGION_OF(region);
 235     M_REGION = rg1 - rg2;
 236     return TRUE;
 237 }
 238
 239
 240 //-----------------------------------------------------------------------------
 241 // Tests
 242 //-----------------------------------------------------------------------------
 243
 244 // Does the region contain the point (x,y)?
 245 wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y) const
 246 {
 247     if (!m_refData)
 248         return wxOutRegion;
 249
 250     if (M_REGION.includes((int)x, (int)y))
 251         return wxInRegion;
 252     else
 253         return wxOutRegion;
 254 }
 255
 256 // Does the region contain the point pt?
 257 wxRegionContain wxRegion::Contains(const wxPoint& pt) const
 258 {
 259     return Contains(pt.x, pt.y);
 260 }
 261
 262 // Does the region contain the rectangle (x, y, w, h)?
 263 wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y, wxCoord w, wxCoord h) const
 264 {
 265     if (!m_refData)
 266         return wxOutRegion;
 267
 268     MGLRect rect(x, y, x + w, y + h);
 269     MGLRegion rg;
 270
 271     // 1) is the rectangle entirely covered by the region?
 272     rg = MGLRegion(rect) - M_REGION;
 273     if (rg.isEmpty()) return wxInRegion;
 274
 275     // 2) is the rectangle completely outside the region?
 276     rg = M_REGION & rect; // intersection
 277     if (rg.isEmpty()) return wxOutRegion;
 278
 279     // 3) neither case happened => it is partially covered:
 280     return wxPartRegion;
 281 }
 282
 283 // Does the region contain the rectangle rect
 284 wxRegionContain wxRegion::Contains(const wxRect& rect) const
 285 {
 286     return Contains(rect.x, rect.y, rect.width, rect.height);
 287 }
 288
 289
 290 ///////////////////////////////////////////////////////////////////////////////
 291 //                               wxRegionIterator                                 //
 292 ///////////////////////////////////////////////////////////////////////////////
 293
 294 #if wxUSE_THREADS
 295 static wxMutex *gs_mutexIterator;
 296
 297 class wxMglRegionModule : public wxModule
 298 {
 299 public:
 300     virtual bool OnInit()
 301     {
 302         gs_mutexIterator = new wxMutex();
 303         return TRUE;
 304     }
 305     virtual void OnExit()
 306     {
 307         wxDELETE(gs_mutexIterator);
 308     }
 309
 310     DECLARE_DYNAMIC_CLASS(wxMglRegionModule)
 311 };
 312 IMPLEMENT_DYNAMIC_CLASS(wxMglRegionModule, wxModule)
 313 #endif
 314
 315 /*
 316  * Initialize empty iterator
 317  */
 318 wxRegionIterator::wxRegionIterator() : m_currentNode(NULL)
 319 {
 320     m_rects.DeleteContents(TRUE);
 321 }
 322
 323 wxRegionIterator::~wxRegionIterator()
 324 {
 325 }
 326
 327 /*
 328  * Initialize iterator for region
 329  */
 330 wxRegionIterator::wxRegionIterator(const wxRegion& region)
 331 {
 332     m_rects.DeleteContents(TRUE);
 333     Reset(region);
 334 }
 335
 336 /*
 337  * Reset iterator for a new /e region.
 338  */
 339
 340
 341 static wxRegionRectList *gs_rectList;
 342
 343 static void MGLAPI wxMGL_region_callback(const rect_t *r)
 344 {
 345     gs_rectList->Append(new wxRect(r->left, r->top,
 346                                    r->right - r->left, r->bottom - r->top));
 347 }
 348
 349 void wxRegionIterator::Reset(const wxRegion& region)
 350 {
 351     m_currentNode = NULL;
 352     m_rects.Clear();
 353
 354     if (!region.Empty())
 355     {
 356 #if wxUSE_THREADS
 357         wxMutexLocker(*gs_mutexIterator);
 358 #endif
 359         gs_rectList = &m_rects;
 360         M_REGION_OF(region).traverse(wxMGL_region_callback);
 361         m_currentNode = m_rects.GetFirst();
 362     }
 363 }
 364
 365 /*
 366  * Increment iterator. The rectangle returned is the one after the
 367  * incrementation.
 368  */
 369 void wxRegionIterator::operator ++ ()
 370 {
 371     if (m_currentNode)
 372         m_currentNode = m_currentNode->GetNext();
 373 }
 374
 375 /*
 376  * Increment iterator. The rectangle returned is the one before the
 377  * incrementation.
 378  */
 379 void wxRegionIterator::operator ++ (int)
 380 {
 381     if (m_currentNode)
 382         m_currentNode = m_currentNode->GetNext();
 383 }
 384
 385 wxCoord wxRegionIterator::GetX() const
 386 {
 387     if (m_currentNode)
 388         return m_currentNode->GetData()->x;
 389     else
 390         return 0;
 391 }
 392
 393 wxCoord wxRegionIterator::GetY() const
 394 {
 395     if (m_currentNode)
 396         return m_currentNode->GetData()->y;
 397     else
 398         return 0;
 399 }
 400
 401 wxCoord wxRegionIterator::GetW() const
 402 {
 403     if (m_currentNode)
 404         return m_currentNode->GetData()->width;
 405     else
 406         return 0;
 407 }
 408
 409 wxCoord wxRegionIterator::GetH() const
 410 {
 411     if (m_currentNode)
 412         return m_currentNode->GetData()->height;
 413     else
 414         return 0;
 415 }