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_horse_pnm = (wxBitmap*) NULL;
 100   my_square = (wxBitmap*) NULL;
 101   my_anti = (wxBitmap*) NULL;
 102
 103   SetBackgroundColour(* wxWHITE);
 104
 105   wxBitmap bitmap( 100, 100 );
 106
 107   wxMemoryDC dc;
 108   dc.SelectObject( bitmap );
 109   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 110   dc.SetPen( *wxWHITE_PEN );
 111   dc.DrawRectangle( 0, 0, 100, 100 );
 112   dc.SelectObject( wxNullBitmap );
 113
 114   // try to find the directory with our images
 115   wxString dir;
 116   if ( wxFile::Exists("./horse.png") )
 117       dir = "./";
 118   else if ( wxFile::Exists("../horse.png") )
 119       dir = "../";
 120   else
 121       wxLogWarning("Can't find image files in either '.' or '..'!");
 122
 123   wxImage image( bitmap );
 124
 125   if ( !image.SaveFile( dir + wxString("test.png"), wxBITMAP_TYPE_PNG ) )
 126       wxLogError("Can't save file");
 127
 128   if ( !image.LoadFile( dir + wxString("horse.png"), wxBITMAP_TYPE_PNG ) )
 129       wxLogError("Can't load PNG image");
 130   else
 131     my_horse_png = new wxBitmap( image.ConvertToBitmap() );
 132
 133   if ( !image.LoadFile( dir + wxString("horse.jpg") ) )
 134       wxLogError("Can't load JPG image");
 135   else
 136       my_horse_jpeg = new wxBitmap( image.ConvertToBitmap() );
 137
 138 #if wxUSE_GIF
 139   if ( !image.LoadFile( dir + wxString("horse.gif") ) )
 140       wxLogError("Can't load GIF image");
 141   else
 142     my_horse_gif = new wxBitmap( image.ConvertToBitmap() );
 143 #endif
 144
 145 #if wxUSE_PCX
 146   if ( !image.LoadFile( dir + wxString("horse.pcx"), wxBITMAP_TYPE_PCX ) )
 147       wxLogError("Can't load PCX image");
 148   else
 149     my_horse_pcx = new wxBitmap( image.ConvertToBitmap() );
 150 #endif
 151
 152   if ( !image.LoadFile( dir + wxString("horse.bmp"), wxBITMAP_TYPE_BMP ) )
 153       wxLogError("Can't load BMP image");
 154   else
 155     my_horse_bmp = new wxBitmap( image.ConvertToBitmap() );
 156
 157 #if wxUSE_PNM
 158   if ( !image.LoadFile( dir + wxString("horse.pnm"), wxBITMAP_TYPE_PNM ) )
 159       wxLogError("Can't load PNM image");
 160   else
 161     my_horse_pnm = new wxBitmap( image.ConvertToBitmap() );
 162 #endif
 163
 164   image.LoadFile( dir + wxString("test.png") );
 165   my_square = new wxBitmap( image.ConvertToBitmap() );
 166
 167   CreateAntiAliasedBitmap();
 168 }
 169
 170 MyCanvas::~MyCanvas()
 171 {
 172   delete my_horse_pnm;
 173   delete my_horse_png;
 174   delete my_horse_jpeg;
 175   delete my_horse_gif;
 176   delete my_horse_bmp;
 177   delete my_horse_pcx;
 178   delete my_square;
 179   delete my_anti;
 180 }
 181
 182 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 183 {
 184   wxPaintDC dc( this );
 185   PrepareDC( dc );
 186
 187   dc.DrawText( "Loaded image", 30, 10 );
 188   if (my_square && my_square->Ok()) dc.DrawBitmap( *my_square, 30, 30 );
 189
 190   dc.DrawText( "Drawn directly", 150, 10 );
 191   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 192   dc.SetPen( *wxWHITE_PEN );
 193   dc.DrawRectangle( 150, 30, 100, 100 );
 194
 195   if (my_anti && my_anti->Ok()) dc.DrawBitmap( *my_anti, 250, 140 );
 196
 197   dc.DrawText( "PNG handler", 30, 135 );
 198   if (my_horse_png && my_horse_png->Ok()) dc.DrawBitmap( *my_horse_png, 30, 150 );
 199
 200   dc.DrawText( "JPEG handler", 30, 365 );
 201   if (my_horse_jpeg && my_horse_jpeg->Ok()) dc.DrawBitmap( *my_horse_jpeg, 30, 380 );
 202
 203   dc.DrawText( "GIF handler", 30, 595 );
 204   if (my_horse_gif && my_horse_gif->Ok()) dc.DrawBitmap( *my_horse_gif, 30, 610 );
 205
 206   dc.DrawText( "PCX handler", 30, 825 );
 207   if (my_horse_pcx && my_horse_pcx->Ok()) dc.DrawBitmap( *my_horse_pcx, 30, 840 );
 208
 209   dc.DrawText( "BMP handler", 30, 1055 );
 210   if (my_horse_bmp && my_horse_bmp->Ok()) dc.DrawBitmap( *my_horse_bmp, 30, 1070 );
 211
 212   dc.DrawText( "PNM handler", 30, 1285 );
 213   if (my_horse_pnm && my_horse_pnm->Ok()) dc.DrawBitmap( *my_horse_pnm, 30, 1300 );
 214 }
 215
 216 void MyCanvas::CreateAntiAliasedBitmap()
 217 {
 218   wxBitmap bitmap( 300, 300 );
 219
 220   wxMemoryDC dc;
 221
 222   dc.SelectObject( bitmap );
 223
 224   dc.Clear();
 225
 226   dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL) );
 227   dc.SetTextForeground( "RED" );
 228   dc.DrawText( "This is anti-aliased Text.", 20, 20 );
 229   dc.DrawText( "And a Rectangle.", 20, 60 );
 230
 231   dc.SetBrush( *wxRED_BRUSH );
 232   dc.SetPen( *wxTRANSPARENT_PEN );
 233   dc.DrawRoundedRectangle( 20, 100, 200, 180, 20 );
 234
 235   wxImage original( bitmap );
 236   wxImage anti( 150, 150 );
 237
 238   /* This is quite slow, but safe. Use wxImage::GetData() for speed instead. */
 239
 240   for (int y = 1; y < 149; y++)
 241     for (int x = 1; x < 149; x++)
 242     {
 243        int red = original.GetRed( x*2, y*2 ) +
 244                  original.GetRed( x*2-1, y*2 ) +
 245                  original.GetRed( x*2, y*2+1 ) +
 246                  original.GetRed( x*2+1, y*2+1 );
 247        red = red/4;
 248
 249        int green = original.GetGreen( x*2, y*2 ) +
 250                    original.GetGreen( x*2-1, y*2 ) +
 251                    original.GetGreen( x*2, y*2+1 ) +
 252                    original.GetGreen( x*2+1, y*2+1 );
 253        green = green/4;
 254
 255        int blue = original.GetBlue( x*2, y*2 ) +
 256                   original.GetBlue( x*2-1, y*2 ) +
 257                   original.GetBlue( x*2, y*2+1 ) +
 258                   original.GetBlue( x*2+1, y*2+1 );
 259        blue = blue/4;
 260        anti.SetRGB( x, y, red, green, blue );
 261     }
 262   my_anti = new wxBitmap( anti.ConvertToBitmap() );
 263 }
 264
 265 // MyFrame
 266
 267 const int ID_QUIT  = 108;
 268 const int ID_ABOUT = 109;
 269
 270 IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
 271
 272 BEGIN_EVENT_TABLE(MyFrame,wxFrame)
 273   EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
 274   EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
 275 END_EVENT_TABLE()
 276
 277 MyFrame::MyFrame()
 278        : wxFrame( (wxFrame *)NULL, -1, "wxImage sample",
 279                   wxPoint(20,20), wxSize(470,360) )
 280 {
 281   wxMenu *file_menu = new wxMenu();
 282   file_menu->Append( ID_ABOUT, "&About..");
 283   file_menu->Append( ID_QUIT, "E&xit");
 284
 285   wxMenuBar *menu_bar = new wxMenuBar();
 286   menu_bar->Append(file_menu, "&File");
 287
 288   SetMenuBar( menu_bar );
 289
 290   CreateStatusBar(2);
 291   int widths[] = { -1, 100 };
 292   SetStatusWidths( 2, widths );
 293
 294   m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
 295
 296   // 500 width * 1300 height
 297   m_canvas->SetScrollbars( 10, 10, 50, 152 );
 298 }
 299
 300 void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
 301 {
 302   Close( TRUE );
 303 }
 304
 305 void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
 306 {
 307   (void)wxMessageBox( "wxImage demo\n"
 308                       "\n"
 309                       "Robert Roebling (c) 1998",
 310                       "About wxImage Demo", wxICON_INFORMATION | wxOK );
 311 }
 312
 313 //-----------------------------------------------------------------------------
 314 // MyApp
 315 //-----------------------------------------------------------------------------
 316
 317 bool MyApp::OnInit()
 318 {
 319 #if wxUSE_LIBPNG
 320   wxImage::AddHandler( new wxPNGHandler );
 321 #endif
 322
 323 #if wxUSE_LIBJPEG
 324   wxImage::AddHandler( new wxJPEGHandler );
 325 #endif
 326
 327 #if wxUSE_GIF
 328   wxImage::AddHandler( new wxGIFHandler );
 329 #endif
 330
 331 #if wxUSE_PCX
 332   wxImage::AddHandler( new wxPCXHandler );
 333 #endif
 334
 335 #if wxUSE_PNM
 336   wxImage::AddHandler( new wxPNMHandler );
 337 #endif
 338
 339   wxFrame *frame = new MyFrame();
 340   frame->Show( TRUE );
 341
 342   return TRUE;
 343 }
 344