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