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_square;
  46     wxBitmap  *my_anti;
  47
  48     DECLARE_DYNAMIC_CLASS(MyCanvas)
  49     DECLARE_EVENT_TABLE()
  50 };
  51
  52 // MyFrame
  53
  54 class MyFrame: public wxFrame
  55 {
  56 public:
  57     MyFrame();
  58
  59     void OnAbout( wxCommandEvent &event );
  60     void OnQuit( wxCommandEvent &event );
  61
  62     MyCanvas         *m_canvas;
  63
  64     DECLARE_DYNAMIC_CLASS(MyFrame)
  65     DECLARE_EVENT_TABLE()
  66 };
  67
  68 // MyApp
  69
  70 class MyApp: public wxApp
  71 {
  72 public:
  73     virtual bool OnInit();
  74 };
  75
  76 // main program
  77
  78 IMPLEMENT_APP(MyApp)
  79
  80 // MyCanvas
  81
  82 IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)
  83
  84 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
  85   EVT_PAINT(MyCanvas::OnPaint)
  86 END_EVENT_TABLE()
  87
  88 MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
  89                     const wxPoint &pos, const wxSize &size )
  90         : wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER )
  91 {
  92   my_horse_png = (wxBitmap*) NULL;
  93   my_horse_jpeg = (wxBitmap*) NULL;
  94   my_horse_gif = (wxBitmap*) NULL;
  95   my_horse_bmp = (wxBitmap*) NULL;
  96   my_square = (wxBitmap*) NULL;
  97   my_anti = (wxBitmap*) NULL;
  98
  99   SetBackgroundColour(* wxWHITE);
 100
 101   wxBitmap bitmap( 100, 100 );
 102
 103   wxMemoryDC dc;
 104   dc.SelectObject( bitmap );
 105   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 106   dc.SetPen( *wxWHITE_PEN );
 107   dc.DrawRectangle( 0, 0, 100, 100 );
 108   dc.SelectObject( wxNullBitmap );
 109
 110   dc.DrawText( "Loaded image", 30, 10 );
 111   if (my_square && my_square->Ok()) dc.DrawBitmap( *my_square, 30, 30 );
 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"), wxBITMAP_TYPE_JPEG ) )
 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"), wxBITMAP_TYPE_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.bmp"), wxBITMAP_TYPE_BMP ) )
 143       wxLogError("Can't load BMP image");
 144   else
 145     my_horse_bmp = new wxBitmap( image.ConvertToBitmap() );
 146
 147   image.LoadFile( dir + wxString("test.png"), wxBITMAP_TYPE_PNG );
 148   my_square = new wxBitmap( image.ConvertToBitmap() );
 149
 150   CreateAntiAliasedBitmap();
 151 }
 152
 153 MyCanvas::~MyCanvas()
 154 {
 155   delete my_horse_png;
 156   delete my_horse_jpeg;
 157   delete my_horse_gif;
 158   delete my_horse_bmp;
 159   delete my_square;
 160   delete my_anti;
 161 }
 162
 163 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 164 {
 165   wxPaintDC dc( this );
 166   PrepareDC( dc );
 167
 168   dc.DrawText( "Loaded image", 30, 10 );
 169   if (my_square && my_square->Ok()) dc.DrawBitmap( *my_square, 30, 30 );
 170
 171   dc.DrawText( "Drawn directly", 150, 10 );
 172   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 173   dc.SetPen( *wxWHITE_PEN );
 174   dc.DrawRectangle( 150, 30, 100, 100 );
 175
 176   if (my_anti && my_anti->Ok()) dc.DrawBitmap( *my_anti, 250, 140 );
 177
 178   dc.DrawText( "PNG handler", 30, 135 );
 179   if (my_horse_png && my_horse_png->Ok()) dc.DrawBitmap( *my_horse_png, 30, 150 );
 180
 181   dc.DrawText( "JPEG handler", 30, 365 );
 182   if (my_horse_jpeg && my_horse_jpeg->Ok()) dc.DrawBitmap( *my_horse_jpeg, 30, 380 );
 183
 184   dc.DrawText( "GIF handler", 30, 595 );
 185   if (my_horse_gif && my_horse_gif->Ok()) dc.DrawBitmap( *my_horse_gif, 30, 610 );
 186
 187   dc.DrawText( "BMP handler", 30, 815 );
 188   if (my_horse_bmp && my_horse_bmp->Ok()) dc.DrawBitmap( *my_horse_bmp, 30, 830 );
 189 }
 190
 191 void MyCanvas::CreateAntiAliasedBitmap()
 192 {
 193   wxBitmap bitmap( 300, 300 );
 194
 195   wxMemoryDC dc;
 196
 197   dc.SelectObject( bitmap );
 198
 199   dc.Clear();
 200
 201   dc.SetFont( wxFont( 24, wxDECORATIVE, wxDEFAULT, wxDEFAULT ) );
 202   dc.SetTextForeground( "RED" );
 203   dc.DrawText( "This is anti-aliased Text.", 20, 20 );
 204   dc.DrawText( "And a Rectangle.", 20, 60 );
 205
 206   dc.SetBrush( *wxRED_BRUSH );
 207   dc.SetPen( *wxTRANSPARENT_PEN );
 208   dc.DrawRoundedRectangle( 20, 100, 200, 180, 20 );
 209
 210   wxImage original( bitmap );
 211   wxImage anti( 150, 150 );
 212
 213   /* This is quite slow, but safe. Use wxImage::GetData() for speed instead. */
 214
 215   for (int y = 1; y < 149; y++)
 216     for (int x = 1; x < 149; x++)
 217     {
 218        int red = original.GetRed( x*2, y*2 ) +
 219                  original.GetRed( x*2-1, y*2 ) +
 220                  original.GetRed( x*2, y*2+1 ) +
 221                  original.GetRed( x*2+1, y*2+1 );
 222        red = red/4;
 223
 224        int green = original.GetGreen( x*2, y*2 ) +
 225                    original.GetGreen( x*2-1, y*2 ) +
 226                    original.GetGreen( x*2, y*2+1 ) +
 227                    original.GetGreen( x*2+1, y*2+1 );
 228        green = green/4;
 229
 230        int blue = original.GetBlue( x*2, y*2 ) +
 231                   original.GetBlue( x*2-1, y*2 ) +
 232                   original.GetBlue( x*2, y*2+1 ) +
 233                   original.GetBlue( x*2+1, y*2+1 );
 234        blue = blue/4;
 235        anti.SetRGB( x, y, red, green, blue );
 236     }
 237   my_anti = new wxBitmap( anti.ConvertToBitmap() );
 238 }
 239
 240 // MyFrame
 241
 242 const int ID_QUIT  = 108;
 243 const int ID_ABOUT = 109;
 244
 245 IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
 246
 247 BEGIN_EVENT_TABLE(MyFrame,wxFrame)
 248   EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
 249   EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
 250 END_EVENT_TABLE()
 251
 252 MyFrame::MyFrame()
 253        : wxFrame( (wxFrame *)NULL, -1, "wxImage sample",
 254                   wxPoint(20,20), wxSize(470,360) )
 255 {
 256   wxMenu *file_menu = new wxMenu();
 257   file_menu->Append( ID_ABOUT, "&About..");
 258   file_menu->Append( ID_QUIT, "E&xit");
 259
 260   wxMenuBar *menu_bar = new wxMenuBar();
 261   menu_bar->Append(file_menu, "&File");
 262
 263   SetMenuBar( menu_bar );
 264
 265   CreateStatusBar(2);
 266   int widths[] = { -1, 100 };
 267   SetStatusWidths( 2, widths );
 268
 269   m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
 270   m_canvas->SetScrollbars( 10, 10, 50, 100 );
 271 }
 272
 273 void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
 274 {
 275   Close( TRUE );
 276 }
 277
 278 void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
 279 {
 280   (void)wxMessageBox( "wxImage demo\n"
 281                       "Robert Roebling (c) 1998",
 282                       "About wxImage Demo", wxICON_INFORMATION | wxOK );
 283 }
 284
 285 //-----------------------------------------------------------------------------
 286 // MyApp
 287 //-----------------------------------------------------------------------------
 288
 289 bool MyApp::OnInit()
 290 {
 291 #if wxUSE_LIBPNG
 292   wxImage::AddHandler( new wxPNGHandler );
 293 #endif
 294
 295 #if wxUSE_LIBJPEG
 296   wxImage::AddHandler( new wxJPEGHandler );
 297 #endif
 298
 299   wxImage::AddHandler( new wxGIFHandler );
 300
 301   wxFrame *frame = new MyFrame();
 302   frame->Show( TRUE );
 303
 304   return TRUE;
 305 }
 306