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