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   CreateAntiAliasedBitmap();
 118 }
 119
 120 MyCanvas::~MyCanvas()
 121 {
 122   delete my_horse;
 123   delete my_square;
 124   delete my_anti;
 125 }
 126
 127 void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
 128 {
 129   wxPaintDC dc( this );
 130   PrepareDC( dc );
 131
 132   dc.DrawText( "Loaded image", 30, 10 );
 133   if (my_square && my_square->Ok()) dc.DrawBitmap( *my_square, 30, 30 );
 134
 135   dc.DrawText( "Drawn directly", 150, 10 );
 136   dc.SetBrush( wxBrush( "orange", wxSOLID ) );
 137   dc.SetPen( *wxWHITE_PEN );
 138   dc.DrawRectangle( 150, 30, 100, 100 );
 139
 140   if (my_anti && my_anti->Ok()) dc.DrawBitmap( *my_anti, 250, 140 );
 141
 142   if (my_horse && my_horse->Ok()) dc.DrawBitmap( *my_horse, 30, 140 );
 143 }
 144
 145 void MyCanvas::CreateAntiAliasedBitmap()
 146 {
 147   wxBitmap bitmap( 300, 300 );
 148
 149   wxMemoryDC dc;
 150
 151   dc.SelectObject( bitmap );
 152
 153   dc.Clear();
 154
 155   dc.SetFont( wxFont( 24, wxDECORATIVE, wxDEFAULT, wxDEFAULT ) );
 156   dc.SetTextForeground( "RED" );
 157   dc.DrawText( "This is anti-aliased Text.", 20, 20 );
 158   dc.DrawText( "And a Rectangle.", 20, 60 );
 159
 160   dc.SetBrush( *wxRED_BRUSH );
 161   dc.DrawRoundedRectangle( 20, 100, 200, 180, 20 );
 162
 163   wxImage original( bitmap );
 164   wxImage anti( 150, 150 );
 165
 166   /* This is quite slow, but safe. Use wxImage::GetData() for speed instead. */
 167
 168   for (int y = 1; y < 149; y++)
 169     for (int x = 1; x < 149; x++)
 170     {
 171        int red = original.GetRed( x*2, y*2 ) +
 172                  original.GetRed( x*2-1, y*2 ) +
 173                  original.GetRed( x*2, y*2+1 ) +
 174                  original.GetRed( x*2+1, y*2+1 );
 175        red = red/4;
 176
 177        int green = original.GetGreen( x*2, y*2 ) +
 178                    original.GetGreen( x*2-1, y*2 ) +
 179                    original.GetGreen( x*2, y*2+1 ) +
 180                    original.GetGreen( x*2+1, y*2+1 );
 181        green = green/4;
 182
 183        int blue = original.GetBlue( x*2, y*2 ) +
 184                   original.GetBlue( x*2-1, y*2 ) +
 185                   original.GetBlue( x*2, y*2+1 ) +
 186                   original.GetBlue( x*2+1, y*2+1 );
 187        blue = blue/4;
 188        anti.SetRGB( x, y, red, green, blue );
 189     }
 190   my_anti = new wxBitmap( anti.ConvertToBitmap() );
 191 }
 192
 193 // MyFrame
 194
 195 const int ID_QUIT  = 108;
 196 const int ID_ABOUT = 109;
 197
 198 IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )
 199
 200 BEGIN_EVENT_TABLE(MyFrame,wxFrame)
 201   EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
 202   EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
 203 END_EVENT_TABLE()
 204
 205 MyFrame::MyFrame()
 206        : wxFrame( (wxFrame *)NULL, -1, "wxImage sample",
 207                   wxPoint(20,20), wxSize(470,360) )
 208 {
 209   wxMenu *file_menu = new wxMenu();
 210   file_menu->Append( ID_ABOUT, "About..");
 211   file_menu->Append( ID_QUIT, "Exit");
 212
 213   wxMenuBar *menu_bar = new wxMenuBar();
 214   menu_bar->Append(file_menu, "File");
 215
 216   SetMenuBar( menu_bar );
 217
 218   CreateStatusBar(2);
 219   int widths[] = { -1, 100 };
 220   SetStatusWidths( 2, widths );
 221
 222   m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
 223   m_canvas->SetScrollbars( 10, 10, 50, 50 );
 224 }
 225
 226 void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
 227 {
 228   Close( TRUE );
 229 }
 230
 231 void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
 232 {
 233   (void)wxMessageBox( "wxImage demo\n"
 234                       "Robert Roebling (c) 1998",
 235                       "About wxImage Demo", wxICON_INFORMATION | wxOK );
 236 }
 237
 238 //-----------------------------------------------------------------------------
 239 // MyApp
 240 //-----------------------------------------------------------------------------
 241
 242 bool MyApp::OnInit()
 243 {
 244   wxFrame *frame = new MyFrame();
 245   frame->Show( TRUE );
 246
 247   return TRUE;
 248 }
 249