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 // derived classes
  24
  25 class MyFrame;
  26 class MyApp;
  27
  28 // MyCanvas
  29
  30 class MyCanvas: public wxScrolledWindow
  31 {
  32 public:
  33     MyCanvas() {};
  34     MyCanvas( wxWindow *parent, wxWindowID, const wxPoint &pos, const wxSize &size );
  35     ~MyCanvas();
  36     void OnPaint( wxPaintEvent &event );
  37     void CreateAntiAliasedBitmap();
  38
  39     wxBitmap  *my_horse_png;
  40     wxBitmap  *my_horse_jpeg;
  41     wxBitmap  *my_horse_gif;
  42     wxBitmap  *my_square;
  43     wxBitmap  *my_anti;
  44
  45     DECLARE_DYNAMIC_CLASS(MyCanvas)
  46     DECLARE_EVENT_TABLE()
  47 };
  48
  49 // MyFrame
  50
  51 class MyFrame: public wxFrame
  52 {
  53 public:
  54     MyFrame();
  55
  56     void OnAbout( wxCommandEvent &event );
  57     void OnQuit( wxCommandEvent &event );
  58
  59     MyCanvas         *m_canvas;
  60
  61     DECLARE_DYNAMIC_CLASS(MyFrame)
  62     DECLARE_EVENT_TABLE()
  63 };
  64
  65 // MyApp
  66
  67 class MyApp: public wxApp
  68 {
  69 public:
  70     virtual bool OnInit();
  71 };
  72
  73 // main program
  74
  75 IMPLEMENT_APP(MyApp)
  76
  77 // MyCanvas
  78
  79 IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)
  80
  81 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
  82   EVT_PAINT(MyCanvas::OnPaint)
  83 END_EVENT_TABLE()
  84
  85 MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
  86                     const wxPoint &pos, const wxSize &size )
  87         : wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER )
  88 {
  89   my_horse_png = (wxBitmap*) NULL;
  90   my_horse_jpeg = (wxBitmap*) NULL;
  91   my_horse_gif = (wxBitmap*) NULL;
  92   my_square = (wxBitmap*) NULL;
  93   my_anti = (wxBitmap*) NULL;
  94
  95   SetBackgroundColour(* wxWHITE);
  96
  97   wxBitmap bitmap( 100, 100 );
  98
  99   wxMemoryDC dc;
 100   dc.SelectObject( bitmap );
 101   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 102   dc.SetPen( *wxWHITE_PEN );
 103   dc.DrawRectangle( 0, 0, 100, 100 );
 104   dc.SelectObject( wxNullBitmap );
 105
 106   wxString dir("");
 107
 108 #ifdef __WXGTK__
 109   dir = wxString("../");
 110 #endif
 111
 112   wxImage image( bitmap );
 113   image.SaveFile( dir + wxString("test.png"), wxBITMAP_TYPE_PNG );
 114
 115   image.LoadFile( dir + wxString("horse.png"), wxBITMAP_TYPE_PNG );
 116   my_horse_png = new wxBitmap( image.ConvertToBitmap() );
 117
 118   image.LoadFile( dir + wxString("horse.jpg"), wxBITMAP_TYPE_JPEG );
 119   my_horse_jpeg = new wxBitmap( image.ConvertToBitmap() );
 120
 121   image.LoadFile( dir + wxString("horse.gif"), wxBITMAP_TYPE_GIF );
 122   my_horse_gif = new wxBitmap( image.ConvertToBitmap() );
 123
 124   image.LoadFile( dir + wxString("test.png"), wxBITMAP_TYPE_PNG );
 125   my_square = new wxBitmap( image.ConvertToBitmap() );
 126
 127   CreateAntiAliasedBitmap();
 128 }
 129
 130 MyCanvas::~MyCanvas()
 131 {
 132   delete my_horse_png;
 133   delete my_horse_jpeg;
 134   delete my_horse_gif;
 135   delete my_square;
 136   delete my_anti;
 137 }
 138
 139 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 140 {
 141   wxPaintDC dc( this );
 142   PrepareDC( dc );
 143
 144   dc.DrawText( "Loaded image", 30, 10 );
 145   if (my_square && my_square->Ok()) dc.DrawBitmap( *my_square, 30, 30 );
 146
 147   dc.DrawText( "Drawn directly", 150, 10 );
 148   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 149   dc.SetPen( *wxWHITE_PEN );
 150   dc.DrawRectangle( 150, 30, 100, 100 );
 151
 152   if (my_anti && my_anti->Ok()) dc.DrawBitmap( *my_anti, 250, 140 );
 153
 154   dc.DrawText( "PNG handler", 30, 135 );
 155   if (my_horse_png && my_horse_png->Ok()) dc.DrawBitmap( *my_horse_png, 30, 150 );
 156
 157   dc.DrawText( "JPEG handler", 30, 365 );
 158   if (my_horse_jpeg && my_horse_jpeg->Ok()) dc.DrawBitmap( *my_horse_jpeg, 30, 380 );
 159
 160   dc.DrawText( "GIF handler", 30, 595 );
 161   if (my_horse_gif && my_horse_gif->Ok()) dc.DrawBitmap( *my_horse_gif, 30, 610 );
 162 }
 163
 164 void MyCanvas::CreateAntiAliasedBitmap()
 165 {
 166   wxBitmap bitmap( 300, 300 );
 167
 168   wxMemoryDC dc;
 169
 170   dc.SelectObject( bitmap );
 171
 172   dc.Clear();
 173
 174   dc.SetFont( wxFont( 24, wxDECORATIVE, wxDEFAULT, wxDEFAULT ) );
 175   dc.SetTextForeground( "RED" );
 176   dc.DrawText( "This is anti-aliased Text.", 20, 20 );
 177   dc.DrawText( "And a Rectangle.", 20, 60 );
 178
 179   dc.SetBrush( *wxRED_BRUSH );
 180   dc.DrawRoundedRectangle( 20, 100, 200, 180, 20 );
 181
 182   wxImage original( bitmap );
 183   wxImage anti( 150, 150 );
 184
 185   /* This is quite slow, but safe. Use wxImage::GetData() for speed instead. */
 186
 187   for (int y = 1; y < 149; y++)
 188     for (int x = 1; x < 149; x++)
 189     {
 190        int red = original.GetRed( x*2, y*2 ) +
 191                  original.GetRed( x*2-1, y*2 ) +
 192                  original.GetRed( x*2, y*2+1 ) +
 193                  original.GetRed( x*2+1, y*2+1 );
 194        red = red/4;
 195
 196        int green = original.GetGreen( x*2, y*2 ) +
 197                    original.GetGreen( x*2-1, y*2 ) +
 198                    original.GetGreen( x*2, y*2+1 ) +
 199                    original.GetGreen( x*2+1, y*2+1 );
 200        green = green/4;
 201
 202        int blue = original.GetBlue( x*2, y*2 ) +
 203                   original.GetBlue( x*2-1, y*2 ) +
 204                   original.GetBlue( x*2, y*2+1 ) +
 205                   original.GetBlue( x*2+1, y*2+1 );
 206        blue = blue/4;
 207        anti.SetRGB( x, y, red, green, blue );
 208     }
 209   my_anti = new wxBitmap( anti.ConvertToBitmap() );
 210 }
 211
 212 // MyFrame
 213
 214 const int ID_QUIT  = 108;
 215 const int ID_ABOUT = 109;
 216
 217 IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
 218
 219 BEGIN_EVENT_TABLE(MyFrame,wxFrame)
 220   EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
 221   EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
 222 END_EVENT_TABLE()
 223
 224 MyFrame::MyFrame()
 225        : wxFrame( (wxFrame *)NULL, -1, "wxImage sample",
 226                   wxPoint(20,20), wxSize(470,360) )
 227 {
 228   wxMenu *file_menu = new wxMenu();
 229   file_menu->Append( ID_ABOUT, "About..");
 230   file_menu->Append( ID_QUIT, "Exit");
 231
 232   wxMenuBar *menu_bar = new wxMenuBar();
 233   menu_bar->Append(file_menu, "File");
 234
 235   SetMenuBar( menu_bar );
 236
 237   CreateStatusBar(2);
 238   int widths[] = { -1, 100 };
 239   SetStatusWidths( 2, widths );
 240
 241   m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
 242   m_canvas->SetScrollbars( 10, 10, 50, 100 );
 243 }
 244
 245 void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
 246 {
 247   Close( TRUE );
 248 }
 249
 250 void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
 251 {
 252   (void)wxMessageBox( "wxImage demo\n"
 253                       "Robert Roebling (c) 1998",
 254                       "About wxImage Demo", wxICON_INFORMATION | wxOK );
 255 }
 256
 257 //-----------------------------------------------------------------------------
 258 // MyApp
 259 //-----------------------------------------------------------------------------
 260
 261 bool MyApp::OnInit()
 262 {
 263 #if wxUSE_LIBPNG
 264   wxImage::AddHandler( new wxPNGHandler );
 265 #endif
 266
 267 #if wxUSE_LIBJPEG
 268   wxImage::AddHandler( new wxJPEGHandler );
 269 #endif
 270
 271   wxImage::AddHandler( new wxGIFHandler );
 272
 273   wxFrame *frame = new MyFrame();
 274   frame->Show( TRUE );
 275
 276   return TRUE;
 277 }
 278