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