src/html/m_image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        m_image.cpp
   3 // Purpose:     wxHtml module for displaying images
   4 // Author:      Vaclav Slavik
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1999 Vaclav Slavik, Joel Lucsy
   7 // Licence:     wxWindows Licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __GNUG__
  11 #pragma implementation
  12 #endif
  13
  14 #include "wx/wxprec.h"
  15
  16 #include "wx/defs.h"
  17 #if wxUSE_HTML && wxUSE_STREAMS
  18
  19 #ifdef __BORDLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WXPRECOMP
  24 #include "wx/wx.h"
  25 #endif
  26
  27 #include "wx/html/forcelnk.h"
  28 #include "wx/html/m_templ.h"
  29
  30
  31 #include "wx/image.h"
  32 #include "wx/dynarray.h"
  33
  34 #include <math.h>
  35 #include <float.h>
  36
  37 FORCE_LINK_ME(m_image)
  38
  39
  40
  41
  42 WX_DECLARE_OBJARRAY(int, CoordArray);
  43 #include "wx/arrimpl.cpp" // this is a magic incantation which must be done!
  44 WX_DEFINE_OBJARRAY(CoordArray);
  45
  46
  47 //--------------------------------------------------------------------------------
  48 // wxHtmlImageMapAreaCell
  49 //                  0-width, 0-height cell that represents single area in imagemap
  50 //                  (it's GetLink is called from wxHtmlImageCell's)
  51 //--------------------------------------------------------------------------------
  52
  53 class wxHtmlImageMapAreaCell : public wxHtmlCell
  54 {
  55     public:
  56         enum celltype { CIRCLE, RECT, POLY };
  57     protected:
  58         CoordArray coords;
  59         celltype type;
  60         int radius;
  61     public:
  62         wxHtmlImageMapAreaCell( celltype t, wxString &coords, double pixel_scale = 1.0);
  63         virtual wxHtmlLinkInfo *GetLink( int x = 0, int y = 0 ) const;
  64 };
  65
  66
  67
  68
  69
  70 wxHtmlImageMapAreaCell::wxHtmlImageMapAreaCell( wxHtmlImageMapAreaCell::celltype t, wxString &incoords, double pixel_scale )
  71 {
  72     int i;
  73     wxString x = incoords, y;
  74
  75     type = t;
  76     while ((i = x.Find( ',' )) != -1)
  77     {
  78         coords.Add( (int)(pixel_scale * (double)wxAtoi( x.Left( i ).c_str())) );
  79         x = x.Mid( i + 1 );
  80     }
  81     coords.Add( (int)(pixel_scale * (double)wxAtoi( x.c_str())) );
  82 }
  83
  84 wxHtmlLinkInfo *wxHtmlImageMapAreaCell::GetLink( int x, int y ) const
  85 {
  86     switch (type)
  87     {
  88         case RECT:
  89             {
  90                 int l, t, r, b;
  91
  92                 l = coords[ 0 ];
  93                 t = coords[ 1 ];
  94                 r = coords[ 2 ];
  95                 b = coords[ 3 ];
  96                 if (x >= l && x <= r && y >= t && y <= b)
  97                         {
  98                     return m_Link;
  99                 }
 100                 break;
 101             }
 102         case CIRCLE:
 103             {
 104                 int l, t, r;
 105                 double  d;
 106
 107                 l = coords[ 0 ];
 108                 t = coords[ 1 ];
 109                 r = coords[ 2 ];
 110                 d = sqrt( (double) (((x - l) * (x - l)) + ((y - t) * (y - t))) );
 111                 if (d < (double)r)
 112                         {
 113                     return m_Link;
 114                 }
 115             }
 116             break;
 117         case POLY:
 118             {
 119                 if (coords.GetCount() >= 6)
 120                         {
 121                     int intersects = 0;
 122                     int wherex = x;
 123                     int wherey = y;
 124                     int totalv = coords.GetCount() / 2;
 125                     int totalc = totalv * 2;
 126                     int xval = coords[totalc - 2];
 127                     int yval = coords[totalc - 1];
 128                     int end = totalc;
 129                     int pointer = 1;
 130
 131                     if ((yval >= wherey) != (coords[pointer] >= wherey))
 132                             {
 133                         if ((xval >= wherex) == (coords[0] >= wherex))
 134                                     {
 135                             intersects += (xval >= wherex) ? 1 : 0;
 136                         }
 137                                     else
 138                                         {
 139                             intersects += ((xval - (yval - wherey) *
 140                                             (coords[0] - xval) /
 141                                             (coords[pointer] - yval)) >= wherex) ? 1 : 0;
 142                         }
 143                     }
 144
 145                     while (pointer < end)
 146                             {
 147                         yval = coords[pointer];
 148                         pointer += 2;
 149                         if (yval >= wherey)
 150                                     {
 151                             while ((pointer < end) && (coords[pointer] >= wherey))
 152                                         {
 153                                 pointer += 2;
 154                             }
 155                             if (pointer >= end)
 156                                         {
 157                                 break;
 158                             }
 159                             if ((coords[pointer - 3] >= wherex) ==
 160                                     (coords[pointer - 1] >= wherex)) {
 161                                 intersects += (coords[pointer - 3] >= wherex) ? 1 : 0;
 162                             }
 163                                         else
 164                                                 {
 165                                 intersects +=
 166                                     ((coords[pointer - 3] - (coords[pointer - 2] - wherey) *
 167                                       (coords[pointer - 1] - coords[pointer - 3]) /
 168                                       (coords[pointer] - coords[pointer - 2])) >= wherex) ? 1 : 0;
 169                             }
 170                         }
 171                                     else
 172                                         {
 173                             while ((pointer < end) && (coords[pointer] < wherey))
 174                                         {
 175                                 pointer += 2;
 176                             }
 177                             if (pointer >= end)
 178                                         {
 179                                 break;
 180                             }
 181                             if ((coords[pointer - 3] >= wherex) ==
 182                                     (coords[pointer - 1] >= wherex))
 183                                             {
 184                                 intersects += (coords[pointer - 3] >= wherex) ? 1 : 0;
 185                             }
 186                                         else
 187                                                 {
 188                                 intersects +=
 189                                     ((coords[pointer - 3] - (coords[pointer - 2] - wherey) *
 190                                       (coords[pointer - 1] - coords[pointer - 3]) /
 191                                       (coords[pointer] - coords[pointer - 2])) >= wherex) ? 1 : 0;
 192                             }
 193                         }
 194                     }
 195                     if ((intersects & 1) != 0)
 196                             {
 197                         return m_Link;
 198                     }
 199                 }
 200             }
 201             break;
 202     }
 203
 204     if (m_Next)
 205     {
 206         wxHtmlImageMapAreaCell  *a = (wxHtmlImageMapAreaCell*)m_Next;
 207         return a->GetLink( x, y );
 208     }
 209     return NULL;
 210 }
 211
 212
 213
 214
 215
 216
 217
 218
 219 //--------------------------------------------------------------------------------
 220 // wxHtmlImageMapCell
 221 //                  0-width, 0-height cell that represents map from imagemaps
 222 //                  it is always placed before wxHtmlImageMapAreaCells
 223 //                  It responds to Find(wxHTML_COND_ISIMAGEMAP)
 224 //--------------------------------------------------------------------------------
 225
 226
 227 class wxHtmlImageMapCell : public wxHtmlCell
 228 {
 229     public:
 230         wxHtmlImageMapCell( wxString &name );
 231     protected:
 232         wxString m_Name;
 233     public:
 234         virtual wxHtmlLinkInfo *GetLink( int x = 0, int y = 0 ) const;
 235         virtual const wxHtmlCell *Find( int cond, const void *param ) const;
 236 };
 237
 238
 239 wxHtmlImageMapCell::wxHtmlImageMapCell( wxString &name )
 240 {
 241     m_Name = name ;
 242 }
 243
 244 wxHtmlLinkInfo *wxHtmlImageMapCell::GetLink( int x, int y ) const
 245 {
 246     wxHtmlImageMapAreaCell  *a = (wxHtmlImageMapAreaCell*)m_Next;
 247     if (a)
 248         return a->GetLink( x, y );
 249     return wxHtmlCell::GetLink( x, y );
 250 }
 251
 252 const wxHtmlCell *wxHtmlImageMapCell::Find( int cond, const void *param ) const
 253 {
 254     if (cond == wxHTML_COND_ISIMAGEMAP)
 255     {
 256         if (m_Name == *((wxString*)(param)))
 257             return this;
 258     }
 259     return wxHtmlCell::Find(cond, param);
 260 }
 261
 262
 263
 264
 265
 266 //--------------------------------------------------------------------------------
 267 // wxHtmlImageCell
 268 //                  Image/bitmap
 269 //--------------------------------------------------------------------------------
 270
 271 class wxHtmlImageCell : public wxHtmlCell
 272 {
 273     public:
 274         wxBitmap *m_Image;
 275         wxHtmlImageMapCell *m_ImageMap;
 276         wxString m_MapName;
 277
 278         wxHtmlImageCell(wxFSFile *input, int w = -1, int h = -1, double scale = 1.0, int align = wxHTML_ALIGN_BOTTOM, wxString mapname = wxEmptyString);
 279         ~wxHtmlImageCell() {if (m_Image) delete m_Image; }
 280         void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2);
 281         virtual wxHtmlLinkInfo *GetLink( int x = 0, int y = 0 ) const;
 282 };
 283
 284
 285
 286
 287 //--------------------------------------------------------------------------------
 288 // wxHtmlImageCell
 289 //--------------------------------------------------------------------------------
 290
 291 wxHtmlImageCell::wxHtmlImageCell(wxFSFile *input, int w, int h, double scale, int align, wxString mapname) : wxHtmlCell()
 292 {
 293     wxImage *img;
 294     int ww, hh;
 295     wxInputStream *s = input->GetStream();
 296
 297     img = new wxImage(*s, wxBITMAP_TYPE_ANY);
 298
 299     m_Image = NULL;
 300     if (img && (img->Ok()))
 301     {
 302         ww = img->GetWidth();
 303         hh = img->GetHeight();
 304         if (w != -1) m_Width = w; else m_Width = ww;
 305         if (h != -1) m_Height = h; else m_Height = hh;
 306
 307         m_Width = (int)(scale * (double)m_Width);
 308         m_Height = (int)(scale * (double)m_Height);
 309
 310         if ((m_Width != ww) || (m_Height != hh))
 311             {
 312             wxImage img2 = img->Scale(m_Width, m_Height);
 313             m_Image = new wxBitmap(img2.ConvertToBitmap());
 314         }
 315             else
 316             m_Image = new wxBitmap(img->ConvertToBitmap());
 317         delete img;
 318     }
 319     switch (align)
 320     {
 321         case wxHTML_ALIGN_TOP :
 322             m_Descent = m_Height;
 323             break;
 324         case wxHTML_ALIGN_CENTER :
 325             m_Descent = m_Height / 2;
 326             break;
 327         case wxHTML_ALIGN_BOTTOM :
 328         default :
 329             m_Descent = 0;
 330             break;
 331     }
 332
 333     m_ImageMap = NULL;
 334     m_MapName = mapname;
 335     SetCanLiveOnPagebreak(FALSE);
 336 }
 337
 338
 339
 340 void wxHtmlImageCell::Draw(wxDC& dc, int x, int y, int view_y1, int view_y2)
 341 {
 342     if (m_Image)
 343 //        dc.DrawBitmap(*m_Image, x + m_PosX, y + m_PosY, (m_Image->GetMask() != (wxMask*) 0));
 344         dc.DrawBitmap(*m_Image, x + m_PosX, y + m_PosY, TRUE);
 345     wxHtmlCell::Draw(dc, x, y, view_y1, view_y2);
 346 }
 347
 348 wxHtmlLinkInfo *wxHtmlImageCell::GetLink( int x, int y ) const
 349 {
 350     if (m_MapName.IsEmpty())
 351         return wxHtmlCell::GetLink( x, y );
 352     if (!m_ImageMap)
 353     {
 354         wxHtmlContainerCell *p, *op;
 355         op = p = GetParent();
 356         while (p)
 357             {
 358             op = p;
 359             p = p->GetParent();
 360         }
 361         p = op;
 362         wxHtmlCell *cell = (wxHtmlCell*)p->Find( wxHTML_COND_ISIMAGEMAP, (const void*)(&m_MapName));
 363         if (!cell)
 364             {
 365             ((wxString&)m_MapName).Clear();
 366             return wxHtmlCell::GetLink( x, y );
 367         }
 368         {   // dirty hack, ask Joel why he fills m_ImageMap in this place
 369             // THE problem is that we're in const method and we can't modify m_ImageMap
 370             wxHtmlImageMapCell **cx = (wxHtmlImageMapCell**)(&m_ImageMap);
 371             *cx = (wxHtmlImageMapCell*)cell;
 372         }
 373     }
 374     return m_ImageMap->GetLink( x, y );
 375 }
 376
 377
 378
 379 //--------------------------------------------------------------------------------
 380 // tag handler
 381 //--------------------------------------------------------------------------------
 382
 383 TAG_HANDLER_BEGIN(IMG, "IMG,MAP,AREA")
 384
 385     TAG_HANDLER_PROC(tag)
 386     {
 387         if (tag.GetName() == wxT("IMG"))
 388             {
 389             if (tag.HasParam(wxT("SRC")))
 390                 {
 391                 int w = -1, h = -1;
 392                 int al;
 393                 wxFSFile *str;
 394                 wxString tmp = tag.GetParam(wxT("SRC"));
 395                 wxString mn = wxEmptyString;
 396
 397                 str = m_WParser->GetFS()->OpenFile(tmp);
 398                 if (tag.HasParam(wxT("WIDTH"))) tag.ScanParam(wxT("WIDTH"), wxT("%i"), &w);
 399                 if (tag.HasParam(wxT("HEIGHT"))) tag.ScanParam(wxT("HEIGHT"), wxT("%i"), &h);
 400                 al = wxHTML_ALIGN_BOTTOM;
 401                 if (tag.HasParam(wxT("ALIGN")))
 402                         {
 403                     wxString alstr = tag.GetParam(wxT("ALIGN"));
 404                     alstr.MakeUpper();  // for the case alignment was in ".."
 405                     if (alstr == wxT("TEXTTOP")) al = wxHTML_ALIGN_TOP;
 406                     else if ((alstr == wxT("CENTER")) || (alstr == wxT("ABSCENTER"))) al = wxHTML_ALIGN_CENTER;
 407                 }
 408                 if (tag.HasParam(wxT("USEMAP")))
 409                         {
 410                     mn = tag.GetParam( wxT("USEMAP") );
 411                     if (mn[ (unsigned int) 0 ] == wxT('#'))
 412                             {
 413                         mn = mn.Mid( 1 );
 414                     }
 415                 }
 416                 wxHtmlImageCell *cel = NULL;
 417                 if (str)
 418                         {
 419                     cel = new wxHtmlImageCell(str, w, h, m_WParser->GetPixelScale(), al, mn);
 420                     cel->SetLink(m_WParser->GetLink());
 421                     m_WParser->GetContainer()->InsertCell(cel);
 422                     delete str;
 423                 }
 424             }
 425         }
 426         if (tag.GetName() == wxT("MAP"))
 427             {
 428             m_WParser->CloseContainer();
 429             m_WParser->OpenContainer();
 430             if (tag.HasParam(wxT("NAME")))
 431                 {
 432                 wxString tmp = tag.GetParam(wxT("NAME"));
 433                 wxHtmlImageMapCell *cel = new wxHtmlImageMapCell( tmp );
 434                 m_WParser->GetContainer()->InsertCell( cel );
 435             }
 436             ParseInner( tag );
 437             m_WParser->CloseContainer();
 438             m_WParser->OpenContainer();
 439         }
 440         if (tag.GetName() == wxT("AREA"))
 441             {
 442             if (tag.HasParam(wxT("SHAPE")))
 443                 {
 444                 wxString tmp = tag.GetParam(wxT("SHAPE"));
 445                 wxString coords = wxEmptyString;
 446                 tmp.MakeUpper();
 447                 wxHtmlImageMapAreaCell *cel = NULL;
 448                 if (tag.HasParam(wxT("COORDS")))
 449                         {
 450                     coords = tag.GetParam(wxT("COORDS"));
 451                 }
 452                 if (tmp == wxT("POLY"))
 453                         {
 454                     cel = new wxHtmlImageMapAreaCell( wxHtmlImageMapAreaCell::POLY, coords, m_WParser->GetPixelScale() );
 455                 }
 456                         else if (tmp == wxT("CIRCLE"))
 457                         {
 458                     cel = new wxHtmlImageMapAreaCell( wxHtmlImageMapAreaCell::CIRCLE, coords, m_WParser->GetPixelScale() );
 459                 }
 460                         else if (tmp == wxT("RECT"))
 461                             {
 462                     cel = new wxHtmlImageMapAreaCell( wxHtmlImageMapAreaCell::RECT, coords, m_WParser->GetPixelScale() );
 463                 }
 464                 if (cel != NULL && tag.HasParam(wxT("HREF")))
 465                         {
 466                     wxString tmp = tag.GetParam(wxT("HREF"));
 467                     wxString target = wxEmptyString;
 468                     if (tag.HasParam(wxT("TARGET"))) target = tag.GetParam(wxT("TARGET"));
 469                     cel->SetLink( wxHtmlLinkInfo(tmp, target));
 470                 }
 471                 if (cel != NULL) m_WParser->GetContainer()->InsertCell( cel );
 472             }
 473         }
 474
 475         return FALSE;
 476     }
 477
 478 TAG_HANDLER_END(IMG)
 479
 480
 481
 482 TAGS_MODULE_BEGIN(Image)
 483
 484     TAGS_MODULE_ADD(IMG)
 485
 486 TAGS_MODULE_END(Image)
 487
 488
 489 #endif