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( wxColour(50,100,150), wxSOLID ) );
 106   dc.SetPen( *wxBLACK_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   printf( "(1,1) red: %d\n", (int)image.GetRed(2,2) );
 122   printf( "(1,1) green: %d\n", (int)image.GetGreen(2,2) );
 123   printf( "(1,1) blue: %d\n", (int)image.GetBlue(2,2) );
 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"), wxBITMAP_TYPE_JPEG ) )
 134       wxLogError("Can't load JPG image");
 135   else
 136       my_horse_jpeg = new wxBitmap( image.ConvertToBitmap() );
 137
 138   if ( !image.LoadFile( dir + wxString("horse.gif"), wxBITMAP_TYPE_GIF ) )
 139       wxLogError("Can't load GIF image");
 140   else
 141     my_horse_gif = new wxBitmap( image.ConvertToBitmap() );
 142
 143   if ( !image.LoadFile( dir + wxString("horse.bmp"), wxBITMAP_TYPE_BMP ) )
 144       wxLogError("Can't load BMP image");
 145   else
 146     my_horse_bmp = new wxBitmap( image.ConvertToBitmap() );
 147
 148   image.LoadFile( dir + wxString("test.png"), wxBITMAP_TYPE_PNG );
 149   my_square = new wxBitmap( image.ConvertToBitmap() );
 150
 151   CreateAntiAliasedBitmap();
 152 }
 153
 154 MyCanvas::~MyCanvas()
 155 {
 156   delete my_horse_png;
 157   delete my_horse_jpeg;
 158   delete my_horse_gif;
 159   delete my_horse_bmp;
 160   delete my_square;
 161   delete my_anti;
 162 }
 163
 164 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 165 {
 166   wxPaintDC dc( this );
 167   PrepareDC( dc );
 168
 169   dc.DrawText( "Loaded image", 30, 10 );
 170   if (my_square && my_square->Ok()) dc.DrawBitmap( *my_square, 30, 30 );
 171
 172   dc.DrawText( "Drawn directly", 150, 10 );
 173   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 174   dc.SetPen( *wxWHITE_PEN );
 175   dc.DrawRectangle( 150, 30, 100, 100 );
 176
 177   if (my_anti && my_anti->Ok()) dc.DrawBitmap( *my_anti, 250, 140 );
 178
 179   dc.DrawText( "PNG handler", 30, 135 );
 180   if (my_horse_png && my_horse_png->Ok()) dc.DrawBitmap( *my_horse_png, 30, 150 );
 181
 182   dc.DrawText( "JPEG handler", 30, 365 );
 183   if (my_horse_jpeg && my_horse_jpeg->Ok()) dc.DrawBitmap( *my_horse_jpeg, 30, 380 );
 184
 185   dc.DrawText( "GIF handler", 30, 595 );
 186   if (my_horse_gif && my_horse_gif->Ok()) dc.DrawBitmap( *my_horse_gif, 30, 610 );
 187
 188   dc.DrawText( "BMP handler", 30, 815 );
 189   if (my_horse_bmp && my_horse_bmp->Ok()) dc.DrawBitmap( *my_horse_bmp, 30, 830 );
 190 }
 191
 192 void MyCanvas::CreateAntiAliasedBitmap()
 193 {
 194   wxBitmap bitmap( 300, 300 );
 195
 196   wxMemoryDC dc;
 197
 198   dc.SelectObject( bitmap );
 199
 200   dc.Clear();
 201
 202   dc.SetFont( wxFont( 24, wxDECORATIVE, wxDEFAULT, wxDEFAULT ) );
 203   dc.SetTextForeground( "RED" );
 204   dc.DrawText( "This is anti-aliased Text.", 20, 20 );
 205   dc.DrawText( "And a Rectangle.", 20, 60 );
 206
 207   dc.SetBrush( *wxRED_BRUSH );
 208   dc.SetPen( *wxTRANSPARENT_PEN );
 209   dc.DrawRoundedRectangle( 20, 100, 200, 180, 20 );
 210
 211   wxImage original( bitmap );
 212   wxImage anti( 150, 150 );
 213
 214   /* This is quite slow, but safe. Use wxImage::GetData() for speed instead. */
 215
 216   for (int y = 1; y < 149; y++)
 217     for (int x = 1; x < 149; x++)
 218     {
 219        int red = original.GetRed( x*2, y*2 ) +
 220                  original.GetRed( x*2-1, y*2 ) +
 221                  original.GetRed( x*2, y*2+1 ) +
 222                  original.GetRed( x*2+1, y*2+1 );
 223        red = red/4;
 224
 225        int green = original.GetGreen( x*2, y*2 ) +
 226                    original.GetGreen( x*2-1, y*2 ) +
 227                    original.GetGreen( x*2, y*2+1 ) +
 228                    original.GetGreen( x*2+1, y*2+1 );
 229        green = green/4;
 230
 231        int blue = original.GetBlue( x*2, y*2 ) +
 232                   original.GetBlue( x*2-1, y*2 ) +
 233                   original.GetBlue( x*2, y*2+1 ) +
 234                   original.GetBlue( x*2+1, y*2+1 );
 235        blue = blue/4;
 236        anti.SetRGB( x, y, red, green, blue );
 237     }
 238   my_anti = new wxBitmap( anti.ConvertToBitmap() );
 239 }
 240
 241 // MyFrame
 242
 243 const int ID_QUIT  = 108;
 244 const int ID_ABOUT = 109;
 245
 246 IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
 247
 248 BEGIN_EVENT_TABLE(MyFrame,wxFrame)
 249   EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
 250   EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
 251 END_EVENT_TABLE()
 252
 253 MyFrame::MyFrame()
 254        : wxFrame( (wxFrame *)NULL, -1, "wxImage sample",
 255                   wxPoint(20,20), wxSize(470,360) )
 256 {
 257   wxMenu *file_menu = new wxMenu();
 258   file_menu->Append( ID_ABOUT, "&About..");
 259   file_menu->Append( ID_QUIT, "E&xit");
 260
 261   wxMenuBar *menu_bar = new wxMenuBar();
 262   menu_bar->Append(file_menu, "&File");
 263
 264   SetMenuBar( menu_bar );
 265
 266   CreateStatusBar(2);
 267   int widths[] = { -1, 100 };
 268   SetStatusWidths( 2, widths );
 269
 270   m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
 271   m_canvas->SetScrollbars( 10, 10, 50, 100 );
 272 }
 273
 274 void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
 275 {
 276   Close( TRUE );
 277 }
 278
 279 void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
 280 {
 281   (void)wxMessageBox( "wxImage demo\n"
 282                       "Robert Roebling (c) 1998",
 283                       "About wxImage Demo", wxICON_INFORMATION | wxOK );
 284 }
 285
 286 //-----------------------------------------------------------------------------
 287 // MyApp
 288 //-----------------------------------------------------------------------------
 289
 290 bool MyApp::OnInit()
 291 {
 292 #if wxUSE_LIBPNG
 293   wxImage::AddHandler( new wxPNGHandler );
 294 #endif
 295
 296 #if wxUSE_LIBJPEG
 297   wxImage::AddHandler( new wxJPEGHandler );
 298 #endif
 299
 300   wxImage::AddHandler( new wxGIFHandler );
 301
 302   wxFrame *frame = new MyFrame();
 303   frame->Show( TRUE );
 304
 305   return TRUE;
 306 }
 307