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_square;
  45     wxBitmap  *my_anti;
  46
  47     DECLARE_DYNAMIC_CLASS(MyCanvas)
  48     DECLARE_EVENT_TABLE()
  49 };
  50
  51 // MyFrame
  52
  53 class MyFrame: public wxFrame
  54 {
  55 public:
  56     MyFrame();
  57
  58     void OnAbout( wxCommandEvent &event );
  59     void OnQuit( wxCommandEvent &event );
  60
  61     MyCanvas         *m_canvas;
  62
  63     DECLARE_DYNAMIC_CLASS(MyFrame)
  64     DECLARE_EVENT_TABLE()
  65 };
  66
  67 // MyApp
  68
  69 class MyApp: public wxApp
  70 {
  71 public:
  72     virtual bool OnInit();
  73 };
  74
  75 // main program
  76
  77 IMPLEMENT_APP(MyApp)
  78
  79 // MyCanvas
  80
  81 IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)
  82
  83 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
  84   EVT_PAINT(MyCanvas::OnPaint)
  85 END_EVENT_TABLE()
  86
  87 MyCanvas::MyCanvas( wxWindow *parent, wxWindowID id,
  88                     const wxPoint &pos, const wxSize &size )
  89         : wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER )
  90 {
  91   my_horse_png = (wxBitmap*) NULL;
  92   my_horse_jpeg = (wxBitmap*) NULL;
  93   my_horse_gif = (wxBitmap*) NULL;
  94   my_square = (wxBitmap*) NULL;
  95   my_anti = (wxBitmap*) NULL;
  96
  97   SetBackgroundColour(* wxWHITE);
  98
  99   wxBitmap bitmap( 100, 100 );
 100
 101   wxMemoryDC dc;
 102   dc.SelectObject( bitmap );
 103   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 104   dc.SetPen( *wxWHITE_PEN );
 105   dc.DrawRectangle( 0, 0, 100, 100 );
 106   dc.SelectObject( wxNullBitmap );
 107
 108   // try to find the directory with our images
 109   wxString dir;
 110   if ( wxFile::Exists("./horse.png") )
 111       dir = "./";
 112   else if ( wxFile::Exists("../horse.png") )
 113       dir = "../";
 114   else
 115       wxLogWarning("Can't find image files in either '.' or '..'!");
 116
 117   wxImage image( bitmap );
 118   if ( !image.SaveFile( dir + wxString("test.png"), wxBITMAP_TYPE_PNG ) )
 119       wxLogError("Can't save file");
 120
 121   if ( !image.LoadFile( dir + wxString("horse.png"), wxBITMAP_TYPE_PNG ) )
 122       wxLogError("Can't load PNG image");
 123   else
 124     my_horse_png = new wxBitmap( image.ConvertToBitmap() );
 125
 126   if ( !image.LoadFile( dir + wxString("horse.jpg"), wxBITMAP_TYPE_JPEG ) )
 127       wxLogError("Can't load JPG image");
 128   else
 129       my_horse_jpeg = new wxBitmap( image.ConvertToBitmap() );
 130
 131   if ( !image.LoadFile( dir + wxString("horse.gif"), wxBITMAP_TYPE_GIF ) )
 132       wxLogError("Can't load GIF image");
 133   else
 134     my_horse_gif = new wxBitmap( image.ConvertToBitmap() );
 135
 136   image.LoadFile( dir + wxString("test.png"), wxBITMAP_TYPE_PNG );
 137   my_square = new wxBitmap( image.ConvertToBitmap() );
 138
 139   CreateAntiAliasedBitmap();
 140 }
 141
 142 MyCanvas::~MyCanvas()
 143 {
 144   delete my_horse_png;
 145   delete my_horse_jpeg;
 146   delete my_horse_gif;
 147   delete my_square;
 148   delete my_anti;
 149 }
 150
 151 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 152 {
 153   wxPaintDC dc( this );
 154   PrepareDC( dc );
 155
 156   dc.DrawText( "Loaded image", 30, 10 );
 157   if (my_square && my_square->Ok()) dc.DrawBitmap( *my_square, 30, 30 );
 158
 159   dc.DrawText( "Drawn directly", 150, 10 );
 160   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 161   dc.SetPen( *wxWHITE_PEN );
 162   dc.DrawRectangle( 150, 30, 100, 100 );
 163
 164   if (my_anti && my_anti->Ok()) dc.DrawBitmap( *my_anti, 250, 140 );
 165
 166   dc.DrawText( "PNG handler", 30, 135 );
 167   if (my_horse_png && my_horse_png->Ok()) dc.DrawBitmap( *my_horse_png, 30, 150 );
 168
 169   dc.DrawText( "JPEG handler", 30, 365 );
 170   if (my_horse_jpeg && my_horse_jpeg->Ok()) dc.DrawBitmap( *my_horse_jpeg, 30, 380 );
 171
 172   dc.DrawText( "GIF handler", 30, 595 );
 173   if (my_horse_gif && my_horse_gif->Ok()) dc.DrawBitmap( *my_horse_gif, 30, 610 );
 174 }
 175
 176 void MyCanvas::CreateAntiAliasedBitmap()
 177 {
 178   wxBitmap bitmap( 300, 300 );
 179
 180   wxMemoryDC dc;
 181
 182   dc.SelectObject( bitmap );
 183
 184   dc.Clear();
 185
 186   dc.SetFont( wxFont( 24, wxDECORATIVE, wxDEFAULT, wxDEFAULT ) );
 187   dc.SetTextForeground( "RED" );
 188   dc.DrawText( "This is anti-aliased Text.", 20, 20 );
 189   dc.DrawText( "And a Rectangle.", 20, 60 );
 190
 191   dc.SetBrush( *wxRED_BRUSH );
 192   dc.DrawRoundedRectangle( 20, 100, 200, 180, 20 );
 193
 194   wxImage original( bitmap );
 195   wxImage anti( 150, 150 );
 196
 197   /* This is quite slow, but safe. Use wxImage::GetData() for speed instead. */
 198
 199   for (int y = 1; y < 149; y++)
 200     for (int x = 1; x < 149; x++)
 201     {
 202        int red = original.GetRed( x*2, y*2 ) +
 203                  original.GetRed( x*2-1, y*2 ) +
 204                  original.GetRed( x*2, y*2+1 ) +
 205                  original.GetRed( x*2+1, y*2+1 );
 206        red = red/4;
 207
 208        int green = original.GetGreen( x*2, y*2 ) +
 209                    original.GetGreen( x*2-1, y*2 ) +
 210                    original.GetGreen( x*2, y*2+1 ) +
 211                    original.GetGreen( x*2+1, y*2+1 );
 212        green = green/4;
 213
 214        int blue = original.GetBlue( x*2, y*2 ) +
 215                   original.GetBlue( x*2-1, y*2 ) +
 216                   original.GetBlue( x*2, y*2+1 ) +
 217                   original.GetBlue( x*2+1, y*2+1 );
 218        blue = blue/4;
 219        anti.SetRGB( x, y, red, green, blue );
 220     }
 221   my_anti = new wxBitmap( anti.ConvertToBitmap() );
 222 }
 223
 224 // MyFrame
 225
 226 const int ID_QUIT  = 108;
 227 const int ID_ABOUT = 109;
 228
 229 IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
 230
 231 BEGIN_EVENT_TABLE(MyFrame,wxFrame)
 232   EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
 233   EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
 234 END_EVENT_TABLE()
 235
 236 MyFrame::MyFrame()
 237        : wxFrame( (wxFrame *)NULL, -1, "wxImage sample",
 238                   wxPoint(20,20), wxSize(470,360) )
 239 {
 240   wxMenu *file_menu = new wxMenu();
 241   file_menu->Append( ID_ABOUT, "&About..");
 242   file_menu->Append( ID_QUIT, "E&xit");
 243
 244   wxMenuBar *menu_bar = new wxMenuBar();
 245   menu_bar->Append(file_menu, "&File");
 246
 247   SetMenuBar( menu_bar );
 248
 249   CreateStatusBar(2);
 250   int widths[] = { -1, 100 };
 251   SetStatusWidths( 2, widths );
 252
 253   m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
 254   m_canvas->SetScrollbars( 10, 10, 50, 100 );
 255 }
 256
 257 void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
 258 {
 259   Close( TRUE );
 260 }
 261
 262 void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
 263 {
 264   (void)wxMessageBox( "wxImage demo\n"
 265                       "Robert Roebling (c) 1998",
 266                       "About wxImage Demo", wxICON_INFORMATION | wxOK );
 267 }
 268
 269 //-----------------------------------------------------------------------------
 270 // MyApp
 271 //-----------------------------------------------------------------------------
 272
 273 bool MyApp::OnInit()
 274 {
 275 #if wxUSE_LIBPNG
 276   wxImage::AddHandler( new wxPNGHandler );
 277 #endif
 278
 279 #if wxUSE_LIBJPEG
 280   wxImage::AddHandler( new wxJPEGHandler );
 281 #endif
 282
 283   wxImage::AddHandler( new wxGIFHandler );
 284
 285   wxFrame *frame = new MyFrame();
 286   frame->Show( TRUE );
 287
 288   return TRUE;
 289 }
 290