samples/image/image.cpp

   1 /*
   2  * Program: image
   3  *
   4  * Author: Robert Roebling
   5  *
   6  * Copyright: (C) 1998, Robert Roebling
   7  *
   8  */
   9
  10 // For compilers that support precompilation, includes "wx/wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14 #pragma hdrstop
  15 #endif
  16
  17 #ifndef WX_PRECOMP
  18 #include "wx/wx.h"
  19 #endif
  20
  21 #include "wx/image.h"
  22
  23 #include "wx/file.h"
  24
  25 // derived classes
  26
  27 class MyFrame;
  28 class MyApp;
  29
  30 // MyCanvas
  31
  32 class MyCanvas: public wxScrolledWindow
  33 {
  34 public:
  35     MyCanvas() {};
  36     MyCanvas( wxWindow *parent, wxWindowID, const wxPoint &pos, const wxSize &size );
  37     ~MyCanvas();
  38     void OnPaint( wxPaintEvent &event );
  39     void CreateAntiAliasedBitmap();
  40
  41     wxBitmap  *my_horse_png;
  42     wxBitmap  *my_horse_jpeg;
  43     wxBitmap  *my_horse_gif;
  44     wxBitmap  *my_horse_bmp;
  45     wxBitmap  *my_horse_pcx;
  46     wxBitmap  *my_horse_pnm;
  47     wxBitmap  *my_horse_tiff;
  48     wxBitmap  *my_square;
  49     wxBitmap  *my_anti;
  50
  51 private:
  52     DECLARE_DYNAMIC_CLASS(MyCanvas)
  53     DECLARE_EVENT_TABLE()
  54 };
  55
  56 // MyFrame
  57
  58 class MyFrame: public wxFrame
  59 {
  60 public:
  61     MyFrame();
  62
  63     void OnAbout( wxCommandEvent &event );
  64     void OnQuit( wxCommandEvent &event );
  65
  66     MyCanvas         *m_canvas;
  67
  68 private:
  69     DECLARE_DYNAMIC_CLASS(MyFrame)
  70     DECLARE_EVENT_TABLE()
  71 };
  72
  73 // MyApp
  74
  75 class MyApp: public wxApp
  76 {
  77 public:
  78     virtual bool OnInit();
  79 };
  80
  81 // main program
  82
  83 IMPLEMENT_APP(MyApp)
  84
  85 // MyCanvas
  86
  87 IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)
  88
  89 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
  90   EVT_PAINT(MyCanvas::OnPaint)
  91 END_EVENT_TABLE()
  92
  93 MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
  94                     const wxPoint &pos, const wxSize &size )
  95         : wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER )
  96 {
  97     my_horse_png = (wxBitmap*) NULL;
  98     my_horse_jpeg = (wxBitmap*) NULL;
  99     my_horse_gif = (wxBitmap*) NULL;
 100     my_horse_bmp = (wxBitmap*) NULL;
 101     my_horse_pcx = (wxBitmap*) NULL;
 102     my_horse_pnm = (wxBitmap*) NULL;
 103     my_horse_tiff = (wxBitmap*) NULL;
 104     my_square = (wxBitmap*) NULL;
 105     my_anti = (wxBitmap*) NULL;
 106
 107     SetBackgroundColour(* wxWHITE);
 108
 109     wxBitmap bitmap( 100, 100 );
 110
 111     wxMemoryDC dc;
 112     dc.SelectObject( bitmap );
 113     dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 114     dc.SetPen( *wxWHITE_PEN );
 115     dc.DrawRectangle( 0, 0, 100, 100 );
 116     dc.SelectObject( wxNullBitmap );
 117
 118     // try to find the directory with our images
 119     wxString dir;
 120     if ( wxFile::Exists("./horse.png") )
 121         dir = "./";
 122     else if ( wxFile::Exists("../horse.png") )
 123         dir = "../";
 124     else
 125         wxLogWarning("Can't find image files in either '.' or '..'!");
 126
 127     wxImage image( bitmap );
 128
 129     if ( !image.SaveFile( dir + wxString("test.png"), wxBITMAP_TYPE_PNG ) )
 130         wxLogError("Can't save file");
 131
 132     if ( !image.LoadFile( dir + wxString("horse.png"), wxBITMAP_TYPE_PNG ) )
 133         wxLogError("Can't load PNG image");
 134     else
 135         my_horse_png = new wxBitmap( image.ConvertToBitmap() );
 136
 137     if ( !image.LoadFile( dir + wxString("horse.jpg") ) )
 138         wxLogError("Can't load JPG image");
 139     else
 140         my_horse_jpeg = new wxBitmap( image.ConvertToBitmap() );
 141
 142 #if wxUSE_GIF
 143     if ( !image.LoadFile( dir + wxString("horse.gif") ) )
 144         wxLogError("Can't load GIF image");
 145     else
 146         my_horse_gif = new wxBitmap( image.ConvertToBitmap() );
 147 #endif
 148
 149 #if wxUSE_PCX
 150     if ( !image.LoadFile( dir + wxString("horse.pcx"), wxBITMAP_TYPE_PCX ) )
 151         wxLogError("Can't load PCX image");
 152     else
 153         my_horse_pcx = new wxBitmap( image.ConvertToBitmap() );
 154 #endif
 155
 156     if ( !image.LoadFile( dir + wxString("horse.bmp"), wxBITMAP_TYPE_BMP ) )
 157         wxLogError("Can't load BMP image");
 158     else
 159         my_horse_bmp = new wxBitmap( image.ConvertToBitmap() );
 160
 161 #if wxUSE_PNM
 162     if ( !image.LoadFile( dir + wxString("horse.pnm"), wxBITMAP_TYPE_PNM ) )
 163         wxLogError("Can't load PNM image");
 164     else
 165         my_horse_pnm = new wxBitmap( image.ConvertToBitmap() );
 166 #endif
 167
 168 #if wxUSE_LIBTIFF
 169     if ( !image.LoadFile( dir + wxString("horse.tif"), wxBITMAP_TYPE_TIF ) )
 170         wxLogError("Can't load TIFF image");
 171     else
 172         my_horse_tiff = new wxBitmap( image.ConvertToBitmap() );
 173 #endif
 174
 175     image.LoadFile( dir + wxString("test.png") );
 176     my_square = new wxBitmap( image.ConvertToBitmap() );
 177
 178     CreateAntiAliasedBitmap();
 179 }
 180
 181 MyCanvas::~MyCanvas()
 182 {
 183     delete my_horse_pnm;
 184     delete my_horse_png;
 185     delete my_horse_jpeg;
 186     delete my_horse_gif;
 187     delete my_horse_bmp;
 188     delete my_horse_pcx;
 189     delete my_horse_tiff;
 190     delete my_square;
 191     delete my_anti;
 192 }
 193
 194 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 195 {
 196   wxPaintDC dc( this );
 197   PrepareDC( dc );
 198
 199   dc.DrawText( "Loaded image", 30, 10 );
 200   if (my_square && my_square->Ok()) dc.DrawBitmap( *my_square, 30, 30 );
 201
 202   dc.DrawText( "Drawn directly", 150, 10 );
 203   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 204   dc.SetPen( *wxWHITE_PEN );
 205   dc.DrawRectangle( 150, 30, 100, 100 );
 206
 207   if (my_anti && my_anti->Ok()) dc.DrawBitmap( *my_anti, 250, 140 );
 208
 209   dc.DrawText( "PNG handler", 30, 135 );
 210   if (my_horse_png && my_horse_png->Ok()) dc.DrawBitmap( *my_horse_png, 30, 150 );
 211
 212   dc.DrawText( "JPEG handler", 30, 365 );
 213   if (my_horse_jpeg && my_horse_jpeg->Ok()) dc.DrawBitmap( *my_horse_jpeg, 30, 380 );
 214
 215   dc.DrawText( "GIF handler", 30, 595 );
 216   if (my_horse_gif && my_horse_gif->Ok()) dc.DrawBitmap( *my_horse_gif, 30, 610 );
 217
 218   dc.DrawText( "PCX handler", 30, 825 );
 219   if (my_horse_pcx && my_horse_pcx->Ok()) dc.DrawBitmap( *my_horse_pcx, 30, 840 );
 220
 221   dc.DrawText( "BMP handler", 30, 1055 );
 222   if (my_horse_bmp && my_horse_bmp->Ok()) dc.DrawBitmap( *my_horse_bmp, 30, 1070 );
 223
 224   dc.DrawText( "PNM handler", 30, 1285 );
 225   if (my_horse_pnm && my_horse_pnm->Ok()) dc.DrawBitmap( *my_horse_pnm, 30, 1300 );
 226
 227   dc.DrawText( "TIFF handler", 30, 1415 );
 228   if (my_horse_tiff && my_horse_tiff->Ok()) dc.DrawBitmap( *my_horse_pnm, 30, 1430 );
 229 }
 230
 231 void MyCanvas::CreateAntiAliasedBitmap()
 232 {
 233   wxBitmap bitmap( 300, 300 );
 234
 235   wxMemoryDC dc;
 236
 237   dc.SelectObject( bitmap );
 238
 239   dc.Clear();
 240
 241   dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL) );
 242   dc.SetTextForeground( "RED" );
 243   dc.DrawText( "This is anti-aliased Text.", 20, 20 );
 244   dc.DrawText( "And a Rectangle.", 20, 60 );
 245
 246   dc.SetBrush( *wxRED_BRUSH );
 247   dc.SetPen( *wxTRANSPARENT_PEN );
 248   dc.DrawRoundedRectangle( 20, 100, 200, 180, 20 );
 249
 250   wxImage original( bitmap );
 251   wxImage anti( 150, 150 );
 252
 253   /* This is quite slow, but safe. Use wxImage::GetData() for speed instead. */
 254
 255   for (int y = 1; y < 149; y++)
 256     for (int x = 1; x < 149; x++)
 257     {
 258        int red = original.GetRed( x*2, y*2 ) +
 259                  original.GetRed( x*2-1, y*2 ) +
 260                  original.GetRed( x*2, y*2+1 ) +
 261                  original.GetRed( x*2+1, y*2+1 );
 262        red = red/4;
 263
 264        int green = original.GetGreen( x*2, y*2 ) +
 265                    original.GetGreen( x*2-1, y*2 ) +
 266                    original.GetGreen( x*2, y*2+1 ) +
 267                    original.GetGreen( x*2+1, y*2+1 );
 268        green = green/4;
 269
 270        int blue = original.GetBlue( x*2, y*2 ) +
 271                   original.GetBlue( x*2-1, y*2 ) +
 272                   original.GetBlue( x*2, y*2+1 ) +
 273                   original.GetBlue( x*2+1, y*2+1 );
 274        blue = blue/4;
 275        anti.SetRGB( x, y, red, green, blue );
 276     }
 277   my_anti = new wxBitmap( anti.ConvertToBitmap() );
 278 }
 279
 280 // MyFrame
 281
 282 const int ID_QUIT  = 108;
 283 const int ID_ABOUT = 109;
 284
 285 IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
 286
 287 BEGIN_EVENT_TABLE(MyFrame,wxFrame)
 288   EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
 289   EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
 290 END_EVENT_TABLE()
 291
 292 MyFrame::MyFrame()
 293        : wxFrame( (wxFrame *)NULL, -1, "wxImage sample",
 294                   wxPoint(20,20), wxSize(470,360) )
 295 {
 296   wxMenu *file_menu = new wxMenu();
 297   file_menu->Append( ID_ABOUT, "&About..");
 298   file_menu->Append( ID_QUIT, "E&xit");
 299
 300   wxMenuBar *menu_bar = new wxMenuBar();
 301   menu_bar->Append(file_menu, "&File");
 302
 303   SetMenuBar( menu_bar );
 304
 305   CreateStatusBar(2);
 306   int widths[] = { -1, 100 };
 307   SetStatusWidths( 2, widths );
 308
 309   m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
 310
 311   // 500 width * 1300 height
 312   m_canvas->SetScrollbars( 10, 10, 50, 180 );
 313 }
 314
 315 void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
 316 {
 317   Close( TRUE );
 318 }
 319
 320 void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
 321 {
 322   (void)wxMessageBox( "wxImage demo\n"
 323                       "\n"
 324                       "Robert Roebling (c) 1998",
 325                       "About wxImage Demo", wxICON_INFORMATION | wxOK );
 326 }
 327
 328 //-----------------------------------------------------------------------------
 329 // MyApp
 330 //-----------------------------------------------------------------------------
 331
 332 bool MyApp::OnInit()
 333 {
 334 #if wxUSE_LIBPNG
 335   wxImage::AddHandler( new wxPNGHandler );
 336 #endif
 337
 338 #if wxUSE_LIBJPEG
 339   wxImage::AddHandler( new wxJPEGHandler );
 340 #endif
 341
 342 #if wxUSE_LIBTIFF
 343   wxImage::AddHandler( new wxTIFFHandler );
 344 #endif
 345
 346 #if wxUSE_GIF
 347   wxImage::AddHandler( new wxGIFHandler );
 348 #endif
 349
 350 #if wxUSE_PCX
 351   wxImage::AddHandler( new wxPCXHandler );
 352 #endif
 353
 354 #if wxUSE_PNM
 355   wxImage::AddHandler( new wxPNMHandler );
 356 #endif
 357
 358   wxFrame *frame = new MyFrame();
 359   frame->Show( TRUE );
 360
 361   return TRUE;
 362 }
 363