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   // try to find the directory with our images
 111   wxString dir;
 112   if ( wxFile::Exists("./horse.png") )
 113       dir = "./";
 114   else if ( wxFile::Exists("../horse.png") )
 115       dir = "../";
 116   else
 117       wxLogWarning("Can't find image files in either '.' or '..'!");
 118
 119   wxImage image( bitmap );
 120
 121   if ( !image.SaveFile( dir + wxString("test.png"), wxBITMAP_TYPE_PNG ) )
 122       wxLogError("Can't save file");
 123
 124   if ( !image.LoadFile( dir + wxString("horse.png"), wxBITMAP_TYPE_PNG ) )
 125       wxLogError("Can't load PNG image");
 126   else
 127     my_horse_png = new wxBitmap( image.ConvertToBitmap() );
 128
 129   if ( !image.LoadFile( dir + wxString("horse.jpg") ) )
 130       wxLogError("Can't load JPG image");
 131   else
 132       my_horse_jpeg = new wxBitmap( image.ConvertToBitmap() );
 133
 134   if ( !image.LoadFile( dir + wxString("horse.gif") ) )
 135       wxLogError("Can't load GIF image");
 136   else
 137     my_horse_gif = new wxBitmap( image.ConvertToBitmap() );
 138
 139   if ( !image.LoadFile( dir + wxString("horse.bmp") ) )
 140       wxLogError("Can't load BMP image");
 141   else
 142     my_horse_bmp = new wxBitmap( image.ConvertToBitmap() );
 143
 144   image.LoadFile( dir + wxString("test.png") );
 145   my_square = new wxBitmap( image.ConvertToBitmap() );
 146
 147   CreateAntiAliasedBitmap();
 148 }
 149
 150 MyCanvas::~MyCanvas()
 151 {
 152   delete my_horse_png;
 153   delete my_horse_jpeg;
 154   delete my_horse_gif;
 155   delete my_horse_bmp;
 156   delete my_square;
 157   delete my_anti;
 158 }
 159
 160 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 161 {
 162   wxPaintDC dc( this );
 163   PrepareDC( dc );
 164
 165   dc.DrawText( "Loaded image", 30, 10 );
 166   if (my_square && my_square->Ok()) dc.DrawBitmap( *my_square, 30, 30 );
 167
 168   dc.DrawText( "Drawn directly", 150, 10 );
 169   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 170   dc.SetPen( *wxWHITE_PEN );
 171   dc.DrawRectangle( 150, 30, 100, 100 );
 172
 173   if (my_anti && my_anti->Ok()) dc.DrawBitmap( *my_anti, 250, 140 );
 174
 175   dc.DrawText( "PNG handler", 30, 135 );
 176   if (my_horse_png && my_horse_png->Ok()) dc.DrawBitmap( *my_horse_png, 30, 150 );
 177
 178   dc.DrawText( "JPEG handler", 30, 365 );
 179   if (my_horse_jpeg && my_horse_jpeg->Ok()) dc.DrawBitmap( *my_horse_jpeg, 30, 380 );
 180
 181   dc.DrawText( "GIF handler", 30, 595 );
 182   if (my_horse_gif && my_horse_gif->Ok()) dc.DrawBitmap( *my_horse_gif, 30, 610 );
 183
 184   dc.DrawText( "BMP handler", 30, 815 );
 185   if (my_horse_bmp && my_horse_bmp->Ok()) dc.DrawBitmap( *my_horse_bmp, 30, 830 );
 186 }
 187
 188 void MyCanvas::CreateAntiAliasedBitmap()
 189 {
 190   wxBitmap bitmap( 300, 300 );
 191
 192   wxMemoryDC dc;
 193
 194   dc.SelectObject( bitmap );
 195
 196   dc.Clear();
 197
 198   dc.SetFont( wxFont( 24, wxDECORATIVE, wxDEFAULT, wxDEFAULT ) );
 199   dc.SetTextForeground( "RED" );
 200   dc.DrawText( "This is anti-aliased Text.", 20, 20 );
 201   dc.DrawText( "And a Rectangle.", 20, 60 );
 202
 203   dc.SetBrush( *wxRED_BRUSH );
 204   dc.SetPen( *wxTRANSPARENT_PEN );
 205   dc.DrawRoundedRectangle( 20, 100, 200, 180, 20 );
 206
 207   wxImage original( bitmap );
 208   wxImage anti( 150, 150 );
 209
 210   /* This is quite slow, but safe. Use wxImage::GetData() for speed instead. */
 211
 212   for (int y = 1; y < 149; y++)
 213     for (int x = 1; x < 149; x++)
 214     {
 215        int red = original.GetRed( x*2, y*2 ) +
 216                  original.GetRed( x*2-1, y*2 ) +
 217                  original.GetRed( x*2, y*2+1 ) +
 218                  original.GetRed( x*2+1, y*2+1 );
 219        red = red/4;
 220
 221        int green = original.GetGreen( x*2, y*2 ) +
 222                    original.GetGreen( x*2-1, y*2 ) +
 223                    original.GetGreen( x*2, y*2+1 ) +
 224                    original.GetGreen( x*2+1, y*2+1 );
 225        green = green/4;
 226
 227        int blue = original.GetBlue( x*2, y*2 ) +
 228                   original.GetBlue( x*2-1, y*2 ) +
 229                   original.GetBlue( x*2, y*2+1 ) +
 230                   original.GetBlue( x*2+1, y*2+1 );
 231        blue = blue/4;
 232        anti.SetRGB( x, y, red, green, blue );
 233     }
 234   my_anti = new wxBitmap( anti.ConvertToBitmap() );
 235 }
 236
 237 // MyFrame
 238
 239 const int ID_QUIT  = 108;
 240 const int ID_ABOUT = 109;
 241
 242 IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
 243
 244 BEGIN_EVENT_TABLE(MyFrame,wxFrame)
 245   EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
 246   EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
 247 END_EVENT_TABLE()
 248
 249 MyFrame::MyFrame()
 250        : wxFrame( (wxFrame *)NULL, -1, "wxImage sample",
 251                   wxPoint(20,20), wxSize(470,360) )
 252 {
 253   wxMenu *file_menu = new wxMenu();
 254   file_menu->Append( ID_ABOUT, "&About..");
 255   file_menu->Append( ID_QUIT, "E&xit");
 256
 257   wxMenuBar *menu_bar = new wxMenuBar();
 258   menu_bar->Append(file_menu, "&File");
 259
 260   SetMenuBar( menu_bar );
 261
 262   CreateStatusBar(2);
 263   int widths[] = { -1, 100 };
 264   SetStatusWidths( 2, widths );
 265
 266   m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
 267   m_canvas->SetScrollbars( 10, 10, 50, 100 );
 268 }
 269
 270 void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
 271 {
 272   Close( TRUE );
 273 }
 274
 275 void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
 276 {
 277   (void)wxMessageBox( "wxImage demo\n"
 278                       "\n"
 279                       "Robert Roebling (c) 1998",
 280                       "About wxImage Demo", wxICON_INFORMATION | wxOK );
 281 }
 282
 283 //-----------------------------------------------------------------------------
 284 // MyApp
 285 //-----------------------------------------------------------------------------
 286
 287 bool MyApp::OnInit()
 288 {
 289 #if wxUSE_LIBPNG
 290   wxImage::AddHandler( new wxPNGHandler );
 291 #endif
 292
 293 #if wxUSE_LIBJPEG
 294   wxImage::AddHandler( new wxJPEGHandler );
 295 #endif
 296
 297   wxImage::AddHandler( new wxGIFHandler );
 298
 299   wxFrame *frame = new MyFrame();
 300   frame->Show( TRUE );
 301
 302   return TRUE;
 303 }
 304