src/html/m_image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        mod_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
  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(mod_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 );
  63         virtual wxString GetLink( int x = 0, int y = 0 ) const;
  64 };
  65
  66
  67
  68
  69
  70 wxHtmlImageMapAreaCell::wxHtmlImageMapAreaCell( wxHtmlImageMapAreaCell::celltype t, wxString &incoords )
  71 {
  72     int i;
  73     wxString x = incoords, y;
  74
  75     type = t;
  76     while ((i = x.Find( ',' )) != -1) {
  77         coords.Add( wxAtoi( x.Left( i ).c_str() ) );
  78         x = x.Mid( i + 1 );
  79     }
  80     coords.Add( wxAtoi( x.c_str() ) );
  81 }
  82
  83 wxString wxHtmlImageMapAreaCell::GetLink( int x, int y ) const
  84 {
  85     switch (type) {
  86         case RECT:
  87             {
  88                 int     l, t, r, b;
  89
  90                 l = coords[ 0 ];
  91                 t = coords[ 1 ];
  92                 r = coords[ 2 ];
  93                 b = coords[ 3 ];
  94                 if (x >= l && x <= r && y >= t && y <= b) {
  95                     return m_Link;
  96                 }
  97                 break;
  98             }
  99         case CIRCLE:
 100             {
 101                 int     l, t, r;
 102                 double  d;
 103
 104                 l = coords[ 0 ];
 105                 t = coords[ 1 ];
 106                 r = coords[ 2 ];
 107                 d = sqrt( (double) (((x - l) * (x - l)) + ((y - t) * (y - t))) );
 108                 if (d < (double)r) {
 109                     return m_Link;
 110                 }
 111             }
 112             break;
 113         case POLY:
 114             {
 115                 if (coords.GetCount() >= 6) {
 116                     int intersects = 0;
 117                     int wherex = x;
 118                     int wherey = y;
 119                     int totalv = coords.GetCount() / 2;
 120                     int totalc = totalv * 2;
 121                     int xval = coords[totalc - 2];
 122                     int yval = coords[totalc - 1];
 123                     int end = totalc;
 124                     int pointer = 1;
 125
 126                     if ((yval >= wherey) != (coords[pointer] >= wherey)) {
 127                         if ((xval >= wherex) == (coords[0] >= wherex)) {
 128                             intersects += (xval >= wherex) ? 1 : 0;
 129                         } else {
 130                             intersects += ((xval - (yval - wherey) *
 131                                             (coords[0] - xval) /
 132                                             (coords[pointer] - yval)) >= wherex) ? 1 : 0;
 133                         }
 134                     }
 135
 136                     while (pointer < end) {
 137                         yval = coords[pointer];
 138                         pointer += 2;
 139                         if (yval >= wherey) {
 140                             while ((pointer < end) && (coords[pointer] >= wherey)) {
 141                                 pointer += 2;
 142                             }
 143                             if (pointer >= end) {
 144                                 break;
 145                             }
 146                             if ((coords[pointer - 3] >= wherex) ==
 147                                     (coords[pointer - 1] >= wherex)) {
 148                                 intersects += (coords[pointer - 3] >= wherex) ? 1 : 0;
 149                             } else {
 150                                 intersects +=
 151                                     ((coords[pointer - 3] - (coords[pointer - 2] - wherey) *
 152                                       (coords[pointer - 1] - coords[pointer - 3]) /
 153                                       (coords[pointer] - coords[pointer - 2])) >= wherex) ? 1 : 0;
 154                             }
 155                         } else {
 156                             while ((pointer < end) && (coords[pointer] < wherey)) {
 157                                 pointer += 2;
 158                             }
 159                             if (pointer >= end) {
 160                                 break;
 161                             }
 162                             if ((coords[pointer - 3] >= wherex) ==
 163                                     (coords[pointer - 1] >= wherex)) {
 164                                 intersects += (coords[pointer - 3] >= wherex) ? 1 : 0;
 165                             } else {
 166                                 intersects +=
 167                                     ((coords[pointer - 3] - (coords[pointer - 2] - wherey) *
 168                                       (coords[pointer - 1] - coords[pointer - 3]) /
 169                                       (coords[pointer] - coords[pointer - 2])) >= wherex) ? 1 : 0;
 170                             }
 171                         }
 172                     }
 173                     if ((intersects & 1) != 0) {
 174                         return m_Link;
 175                     }
 176                 }
 177             }
 178             break;
 179     }
 180     if (m_Next) {
 181         wxHtmlImageMapAreaCell  *a = (wxHtmlImageMapAreaCell*)m_Next;
 182         return a->GetLink( x, y );
 183     }
 184     return wxEmptyString;
 185 }
 186
 187
 188
 189
 190
 191
 192
 193
 194 //--------------------------------------------------------------------------------
 195 // wxHtmlImageMapCell
 196 //                  0-width, 0-height cell that represents map from imagemaps
 197 //                  it is always placed before wxHtmlImageMapAreaCells
 198 //                  It responds to Find(wxHTML_COND_ISIMAGEMAP)
 199 //--------------------------------------------------------------------------------
 200
 201
 202 class wxHtmlImageMapCell : public wxHtmlCell
 203 {
 204     public:
 205         wxHtmlImageMapCell( wxString &name );
 206     protected:
 207         wxString m_Name;
 208     public:
 209         virtual wxString GetLink( int x = 0, int y = 0 ) const;
 210         virtual const wxHtmlCell *Find( int cond, const void *param ) const;
 211 };
 212
 213
 214 wxHtmlImageMapCell::wxHtmlImageMapCell( wxString &name )
 215 {
 216     m_Name = name ;
 217 }
 218
 219 wxString wxHtmlImageMapCell::GetLink( int x, int y ) const
 220 {
 221     wxHtmlImageMapAreaCell      *a = (wxHtmlImageMapAreaCell*)m_Next;
 222     if (a)
 223         return a->GetLink( x, y );
 224     return wxHtmlCell::GetLink( x, y );
 225 }
 226
 227 const wxHtmlCell *wxHtmlImageMapCell::Find( int cond, const void *param ) const
 228 {
 229     if (cond == wxHTML_COND_ISIMAGEMAP) {
 230         if (m_Name == *((wxString*)(param)))
 231             return this;
 232     }
 233     return wxHtmlCell::Find(cond, param);
 234 }
 235
 236
 237
 238
 239
 240 //--------------------------------------------------------------------------------
 241 // wxHtmlImageCell
 242 //                  Image/bitmap
 243 //--------------------------------------------------------------------------------
 244
 245 class wxHtmlImageCell : public wxHtmlCell
 246 {
 247     public:
 248         wxBitmap *m_Image;
 249         wxHtmlImageMapCell *m_ImageMap;
 250         wxString m_MapName;
 251
 252         wxHtmlImageCell(wxFSFile *input, int w = -1, int h = -1, int align = wxHTML_ALIGN_BOTTOM, wxString mapname = wxEmptyString);
 253         ~wxHtmlImageCell() {if (m_Image) delete m_Image; }
 254         void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2);
 255         virtual wxString GetLink( int x = 0, int y = 0 ) const;
 256 };
 257
 258
 259
 260
 261 //--------------------------------------------------------------------------------
 262 // wxHtmlImageCell
 263 //--------------------------------------------------------------------------------
 264
 265 wxHtmlImageCell::wxHtmlImageCell(wxFSFile *input, int w, int h, int align, wxString mapname) : wxHtmlCell()
 266 {
 267     wxImage *img;
 268     int ww, hh;
 269     wxInputStream *s = input -> GetStream();
 270
 271     img = new wxImage(*s, wxBITMAP_TYPE_ANY);
 272
 273     m_Image = NULL;
 274     if (img && (img -> Ok())) {
 275         ww = img -> GetWidth();
 276         hh = img -> GetHeight();
 277         if (w != -1) m_Width = w; else m_Width = ww;
 278         if (h != -1) m_Height = h; else m_Height = hh;
 279         if ((m_Width != ww) || (m_Height != hh)) {
 280             wxImage img2 = img -> Scale(m_Width, m_Height);
 281             m_Image = new wxBitmap(img2.ConvertToBitmap());
 282         } else
 283             m_Image = new wxBitmap(img -> ConvertToBitmap());
 284         delete img;
 285     }
 286     switch (align) {
 287         case wxHTML_ALIGN_TOP :
 288             m_Descent = m_Height;
 289             break;
 290         case wxHTML_ALIGN_CENTER :
 291             m_Descent = m_Height / 2;
 292             break;
 293         case wxHTML_ALIGN_BOTTOM :
 294         default :
 295             m_Descent = 0;
 296             break;
 297     }
 298
 299     m_ImageMap = NULL;
 300     m_MapName = mapname;
 301     SetCanLiveOnPagebreak(FALSE);
 302 }
 303
 304
 305
 306 void wxHtmlImageCell::Draw(wxDC& dc, int x, int y, int view_y1, int view_y2)
 307 {
 308     if (m_Image)
 309         dc.DrawBitmap(*m_Image, x + m_PosX, y + m_PosY, TRUE);
 310     wxHtmlCell::Draw(dc, x, y, view_y1, view_y2);
 311 }
 312
 313 wxString wxHtmlImageCell::GetLink( int x, int y ) const
 314 {
 315     if (m_MapName.IsEmpty())
 316         return wxHtmlCell::GetLink( x, y );
 317     if (!m_ImageMap) {
 318         wxHtmlContainerCell     *p, *op;
 319         op = p = GetParent();
 320         while (p) {
 321             op = p;
 322             p = p->GetParent();
 323         }
 324         p = op;
 325         wxHtmlCell *cell = (wxHtmlCell*)p->Find( wxHTML_COND_ISIMAGEMAP, (const void*)(&m_MapName));
 326         if (!cell) {
 327             ((wxString&)m_MapName).Clear();
 328             return wxHtmlCell::GetLink( x, y );
 329         }
 330         { // dirty hack, ask Joel why he fills m_ImageMap in this place
 331             // THE problem is that we're in const method and we can't modify m_ImageMap
 332             wxHtmlImageMapCell **cx = (wxHtmlImageMapCell**)(&m_ImageMap);
 333             *cx = (wxHtmlImageMapCell*)cell;
 334         }
 335     }
 336     return m_ImageMap->GetLink( x, y );
 337 }
 338
 339
 340
 341 //--------------------------------------------------------------------------------
 342 // tag handler
 343 //--------------------------------------------------------------------------------
 344
 345 TAG_HANDLER_BEGIN(IMG, "IMG,MAP,AREA")
 346
 347     TAG_HANDLER_PROC(tag)
 348     {
 349         if (tag.GetName() == "IMG") {
 350             if (tag.HasParam("SRC")) {
 351                 int w = -1, h = -1;
 352                 int al;
 353                 wxFSFile *str;
 354                 wxString tmp = tag.GetParam("SRC");
 355                 wxString mn = wxEmptyString;
 356
 357                 str = m_WParser -> GetFS() -> OpenFile(tmp);
 358                 if (tag.HasParam(wxT("WIDTH"))) tag.ScanParam(wxT("WIDTH"), wxT("%i"), &w);
 359                 if (tag.HasParam(wxT("HEIGHT"))) tag.ScanParam(wxT("HEIGHT"), wxT("%i"), &h);
 360                 al = wxHTML_ALIGN_BOTTOM;
 361                 if (tag.HasParam("ALIGN")) {
 362                     wxString alstr = tag.GetParam("ALIGN");
 363                     alstr.MakeUpper();  // for the case alignment was in ".."
 364                     if (alstr == "TEXTTOP") al = wxHTML_ALIGN_TOP;
 365                     else if ((alstr == "CENTER") || (alstr == "ABSCENTER")) al = wxHTML_ALIGN_CENTER;
 366                 }
 367                 if (tag.HasParam("USEMAP")) {
 368                     mn = tag.GetParam( "USEMAP" );
 369                     if (mn[ 0 ] == '#') {
 370                         mn = mn.Mid( 1 );
 371                     }
 372                 }
 373                 wxHtmlImageCell *cel = NULL;
 374                 if (str) {
 375                     cel = new wxHtmlImageCell(str, w, h, al, mn);
 376                     cel -> SetLink(m_WParser -> GetLink());
 377                     m_WParser -> GetContainer() -> InsertCell(cel);
 378                     delete str;
 379                 }
 380             }
 381         }
 382         if (tag.GetName() == "MAP") {
 383             m_WParser->CloseContainer();
 384             m_WParser->OpenContainer();
 385             if (tag.HasParam("NAME")) {
 386                 wxString tmp = tag.GetParam("NAME");
 387                 wxHtmlImageMapCell *cel = new wxHtmlImageMapCell( tmp );
 388                 m_WParser->GetContainer()->InsertCell( cel );
 389             }
 390             ParseInner( tag );
 391             m_WParser->CloseContainer();
 392             m_WParser->OpenContainer();
 393         }
 394         if (tag.GetName() == "AREA") {
 395             if (tag.HasParam("SHAPE")) {
 396                 wxString tmp = tag.GetParam("SHAPE");
 397                 wxString coords;
 398                 tmp.MakeUpper();
 399                 wxHtmlImageMapAreaCell *cel = NULL;
 400                 if (tag.HasParam("COORDS")) {
 401                     coords = tag.GetParam("COORDS");
 402                 }
 403                 if (tmp == "POLY") {
 404                     cel = new wxHtmlImageMapAreaCell( wxHtmlImageMapAreaCell::POLY, coords );
 405                 } else if (tmp == "CIRCLE") {
 406                     cel = new wxHtmlImageMapAreaCell( wxHtmlImageMapAreaCell::CIRCLE, coords );
 407                 } else if (tmp == "RECT") {
 408                     cel = new wxHtmlImageMapAreaCell( wxHtmlImageMapAreaCell::RECT, coords );
 409                 }
 410                 if (cel != NULL && tag.HasParam("HREF")) {
 411                     wxString tmp = tag.GetParam("HREF");
 412                     cel->SetLink( tmp );
 413                 }
 414                 if (cel != NULL) m_WParser->GetContainer()->InsertCell( cel );
 415             }
 416         }
 417
 418         return FALSE;
 419     }
 420
 421 TAG_HANDLER_END(IMG)
 422
 423
 424
 425 TAGS_MODULE_BEGIN(Image)
 426
 427     TAGS_MODULE_ADD(IMG)
 428
 429 TAGS_MODULE_END(Image)
 430
 431
 432 #endif