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