samples/erase/erase.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        erase.cpp
   3 // Purpose:     Erase wxWindows sample
   4 // Author:      Robert Roebling
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "erase.cpp"
  22     #pragma interface "erase.cpp"
  23 #endif
  24
  25 // For compilers that support precompilation, includes "wx/wx.h".
  26 #include "wx/wxprec.h"
  27
  28 #ifdef __BORLANDC__
  29     #pragma hdrstop
  30 #endif
  31
  32 // for all others, include the necessary headers (this file is usually all you
  33 // need because it includes almost all "standard" wxWindows headers)
  34 #ifndef WX_PRECOMP
  35     #include "wx/wx.h"
  36 #endif
  37
  38 // ----------------------------------------------------------------------------
  39 // resources
  40 // ----------------------------------------------------------------------------
  41 // the application icon
  42 #if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__)
  43     #include "mondrian.xpm"
  44 #endif
  45
  46 // ----------------------------------------------------------------------------
  47 // private classes
  48 // ----------------------------------------------------------------------------
  49
  50 class MyApp : public wxApp
  51 {
  52 public:
  53     virtual bool OnInit();
  54 };
  55
  56
  57 class MyFrame : public wxFrame
  58 {
  59 public:
  60     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  61
  62     void OnQuit(wxCommandEvent& event);
  63     void OnAbout(wxCommandEvent& event);
  64
  65 private:
  66     DECLARE_EVENT_TABLE()
  67 };
  68
  69
  70 class MyCanvas : public wxScrolledWindow
  71 {
  72 public:
  73     MyCanvas( MyFrame *parent );
  74
  75     void OnPaint( wxPaintEvent &event );
  76     void OnEraseBackground( wxEraseEvent &event );
  77
  78     wxBitmap    m_bitmap;
  79
  80 private:
  81     DECLARE_EVENT_TABLE()
  82 };
  83
  84 // ----------------------------------------------------------------------------
  85 // constants
  86 // ----------------------------------------------------------------------------
  87
  88 enum
  89 {
  90     // menu items
  91     Minimal_Quit = 1,
  92     Minimal_About
  93 };
  94
  95
  96 // ----------------------------------------------------------------------------
  97 // the application class
  98 // ----------------------------------------------------------------------------
  99
 100 IMPLEMENT_APP(MyApp)
 101
 102 bool MyApp::OnInit()
 103 {
 104     MyFrame *frame = new MyFrame("Minimal wxWindows App",
 105                                  wxPoint(50, 50), wxSize(450, 340));
 106
 107     frame->Show(TRUE);
 108
 109     return TRUE;
 110 }
 111
 112 // ----------------------------------------------------------------------------
 113 // main frame
 114 // ----------------------------------------------------------------------------
 115
 116 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 117     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 118     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 119 END_EVENT_TABLE()
 120
 121 // frame constructor
 122 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 123        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 124 {
 125 #ifdef __WXMAC__
 126     wxApp::s_macAboutMenuItemId = Minimal_About;
 127 #endif
 128
 129     SetIcon(wxICON(mondrian));
 130
 131     wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
 132
 133     wxMenu *helpMenu = new wxMenu;
 134     helpMenu->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
 135
 136     menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 137
 138     wxMenuBar *menuBar = new wxMenuBar();
 139     menuBar->Append(menuFile, "&File");
 140     menuBar->Append(helpMenu, "&Help");
 141
 142     SetMenuBar(menuBar);
 143
 144 #if wxUSE_STATUSBAR
 145     // create a status bar just for fun (by default with 1 pane only)
 146     CreateStatusBar(2);
 147     SetStatusText("Welcome to wxWindows!");
 148 #endif // wxUSE_STATUSBAR
 149
 150     (void)new MyCanvas( this );
 151 }
 152
 153
 154 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 155 {
 156     Close(TRUE);
 157 }
 158
 159 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 160 {
 161     wxString msg;
 162     msg.Printf( _T("This is the about dialog of the Erase sample.\n")
 163                 _T("Welcome to %s"), wxVERSION_STRING);
 164
 165     wxMessageBox(msg, "About Erase", wxOK | wxICON_INFORMATION, this);
 166 }
 167
 168
 169 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 170     EVT_PAINT(  MyCanvas::OnPaint)
 171     EVT_ERASE_BACKGROUND(  MyCanvas::OnEraseBackground)
 172 END_EVENT_TABLE()
 173
 174 MyCanvas::MyCanvas( MyFrame *parent )
 175  : wxScrolledWindow( parent, -1, wxDefaultPosition, wxDefaultSize,
 176                     wxScrolledWindowStyle|wxNO_FULL_REPAINT_ON_RESIZE|wxSUNKEN_BORDER )
 177 {
 178     SetScrollbars( 10, 10, 40, 100, 0, 0 );
 179
 180     m_bitmap = wxBitmap( mondrian_xpm );
 181
 182     new wxStaticBitmap( this, -1, m_bitmap, wxPoint(80,20) );
 183 }
 184
 185 void MyCanvas::OnPaint( wxPaintEvent &event )
 186 {
 187     wxPaintDC dc(this);
 188     PrepareDC( dc );
 189
 190     dc.SetBrush( *wxBLACK_BRUSH );
 191     dc.DrawRectangle( 0,0,200,50 );
 192
 193     dc.DrawBitmap( m_bitmap, 10, 20, TRUE );
 194
 195 #if 0
 196     wxRegionIterator upd( GetUpdateRegion() );
 197     while (upd)
 198     {
 199         wxLogDebug( "Paint: %d %d %d %d", upd.GetX(), upd.GetY(), upd.GetWidth(), upd.GetHeight() );
 200         upd ++;
 201     }
 202 #endif
 203
 204 #if 0
 205     wxSize size = GetSize();
 206     wxSize client_size = GetClientSize();
 207     wxLogDebug( "size %d %d client_size %d %d", size.x, size.y, client_size.x, client_size.y );
 208 #endif
 209
 210     int i;
 211     dc.SetPen( *wxWHITE_PEN );
 212     for (i = 0; i < 20; i += 2)
 213        dc.DrawLine( i,i, i+100,i );
 214
 215     dc.SetPen( *wxWHITE_PEN );
 216     for (i = 200; i < 220; i += 2)
 217        dc.DrawLine( i-200,i, i-100,i );
 218
 219     wxRegion region( 110, 110, 80, 80 );
 220     wxRegion hole( 130, 130, 40, 1 );
 221     region.Intersect( hole );
 222     dc.SetClippingRegion( region );
 223
 224     dc.SetBrush( *wxRED_BRUSH );
 225     dc.DrawRectangle( 100, 100, 200, 200 );
 226
 227     dc.DestroyClippingRegion();
 228
 229     dc.SetPen( *wxTRANSPARENT_PEN );
 230
 231     wxRegion strip( 110, 200, 30, 1 );
 232     wxRegionIterator it( strip );
 233     while (it)
 234     {
 235         dc.DrawRectangle( it.GetX(), it.GetY(), it.GetWidth(), it.GetHeight() );
 236         it ++;
 237     }
 238 }
 239
 240 void MyCanvas::OnEraseBackground( wxEraseEvent &event )
 241 {
 242     event.Skip( TRUE );
 243 }
 244