src/html/mod_image.cpp

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