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