samples/drawing/drawing.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        drawing.cpp
   3 // Purpose:     shows and tests wxDC features
   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 #ifdef __GNUG__
  20     #pragma implementation "drawing.cpp"
  21     #pragma interface "drawing.cpp"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx/wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 // for all others, include the necessary headers (this file is usually all you
  32 // need because it includes almost all "standard" wxWindows headers
  33 #ifndef WX_PRECOMP
  34     #include "wx/wx.h"
  35 #endif
  36
  37 #include "wx/colordlg.h"
  38
  39 // ----------------------------------------------------------------------------
  40 // ressources
  41 // ----------------------------------------------------------------------------
  42 // the application icon
  43 #if defined(__WXGTK__) || defined(__WXMOTIF__)
  44     #include "mondrian.xpm"
  45 #endif
  46
  47 // ----------------------------------------------------------------------------
  48 // private classes
  49 // ----------------------------------------------------------------------------
  50
  51 // Define a new application type, each program should derive a class from wxApp
  52 class MyApp : public wxApp
  53 {
  54 public:
  55     // override base class virtuals
  56     // ----------------------------
  57
  58     // this one is called on application startup and is a good place for the app
  59     // initialization (doing it here and not in the ctor allows to have an error
  60     // return: if OnInit() returns false, the application terminates)
  61     virtual bool OnInit();
  62 };
  63
  64 class MyCanvas;
  65
  66 // Define a new frame type: this is going to be our main frame
  67 class MyFrame : public wxFrame
  68 {
  69 public:
  70     // ctor(s)
  71     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  72
  73     // event handlers (these functions should _not_ be virtual)
  74     void OnQuit(wxCommandEvent& event);
  75     void OnAbout(wxCommandEvent& event);
  76     void OnOption(wxCommandEvent &event);
  77     void OnMouseMove(wxMouseEvent &event);
  78
  79     wxColour SelectColour();
  80     void PrepareDC(wxDC& dc);
  81
  82     int         m_backgroundMode;
  83     int         m_mapMode;
  84     double      m_xUserScale;
  85     double      m_yUserScale;
  86     int         m_xLogicalOrigin;
  87     int         m_yLogicalOrigin;
  88     bool        m_xAxisReversed,
  89                 m_yAxisReversed;
  90     wxColour    m_colourForeground,    // these are _text_ colours
  91                 m_colourBackground;
  92     wxBrush     m_backgroundBrush;
  93     MyCanvas   *m_canvas;
  94
  95 private:
  96     // any class wishing to process wxWindows events must use this macro
  97     DECLARE_EVENT_TABLE()
  98 };
  99
 100 // define a scrollable canvas for drawing onto
 101 class MyCanvas: public wxScrolledWindow
 102 {
 103 public:
 104     MyCanvas( MyFrame *parent );
 105
 106     void DoDrawTests( int x, int y, wxDC &dc );
 107     void OnPaint(wxPaintEvent &event);
 108
 109 protected:
 110     MyFrame *m_owner;
 111
 112 private:
 113     DECLARE_EVENT_TABLE()
 114 };
 115
 116 // ----------------------------------------------------------------------------
 117 // constants
 118 // ----------------------------------------------------------------------------
 119
 120 // IDs for the controls and the menu commands
 121 enum
 122 {
 123     // menu items
 124     Minimal_Quit = 1,
 125     Minimal_About,
 126
 127     MenuOption_First,
 128
 129     MapMode_Text = MenuOption_First,
 130     MapMode_Lometric,
 131     MapMode_Twips,
 132     MapMode_Points,
 133     MapMode_Metric,
 134
 135     UserScale_StretchHoriz,
 136     UserScale_ShrinkHoriz,
 137     UserScale_StretchVertic,
 138     UserScale_ShrinkVertic,
 139     UserScale_Restore,
 140
 141     AxisMirror_Horiz,
 142     AxisMirror_Vertic,
 143
 144     LogicalOrigin_MoveDown,
 145     LogicalOrigin_MoveUp,
 146     LogicalOrigin_MoveLeft,
 147     LogicalOrigin_MoveRight,
 148
 149     Colour_TextForeground,
 150     Colour_TextBackground,
 151     Colour_Background,
 152     Colour_BackgroundMode,
 153
 154     MenuOption_Last = Colour_BackgroundMode
 155 };
 156
 157 // ----------------------------------------------------------------------------
 158 // event tables and other macros for wxWindows
 159 // ----------------------------------------------------------------------------
 160
 161
 162 // Create a new application object: this macro will allow wxWindows to create
 163 // the application object during program execution (it's better than using a
 164 // static object for many reasons) and also declares the accessor function
 165 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 166 // not wxApp)
 167 IMPLEMENT_APP(MyApp)
 168
 169 // ============================================================================
 170 // implementation
 171 // ============================================================================
 172
 173 // ----------------------------------------------------------------------------
 174 // the application class
 175 // ----------------------------------------------------------------------------
 176
 177 // `Main program' equivalent: the program execution "starts" here
 178 bool MyApp::OnInit()
 179 {
 180     // Create the main application window
 181     MyFrame *frame = new MyFrame("Drawing sample",
 182                                  wxPoint(50, 50), wxSize(550, 340));
 183
 184     // Show it and tell the application that it's our main window
 185     frame->Show(TRUE);
 186     SetTopWindow(frame);
 187
 188     // success: wxApp::OnRun() will be called which will enter the main message
 189     // loop and the application will run. If we returned FALSE here, the
 190     // application would exit immediately.
 191     return TRUE;
 192 }
 193
 194 // ----------------------------------------------------------------------------
 195 // MyCanvas
 196 // ----------------------------------------------------------------------------
 197
 198 // the event tables connect the wxWindows events with the functions (event
 199 // handlers) which process them.
 200 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 201     EVT_PAINT  (MyCanvas::OnPaint)
 202 END_EVENT_TABLE()
 203
 204 MyCanvas::MyCanvas( MyFrame *parent )
 205   : wxScrolledWindow( parent )
 206 {
 207   m_owner = parent;
 208 }
 209
 210 void MyCanvas::DoDrawTests( int x, int y, wxDC &dc )
 211 {
 212    wxRect rect;
 213    rect.x = dc.LogicalToDeviceX( x-20 );
 214    rect.y = dc.LogicalToDeviceY( y-20 );
 215    rect.width = dc.LogicalToDeviceXRel( 500 );
 216    rect.height = dc.LogicalToDeviceYRel( 200 );
 217    if (!IsExposed(rect)) return;
 218
 219    dc.DrawLine( x    , y, x    , y    );
 220    dc.DrawLine( x+ 20, y, x+ 20, y+ 1 );
 221    dc.DrawLine( x+ 40, y, x+ 40, y+ 2 );
 222    dc.DrawLine( x+ 60, y, x+ 60, y+ 3 );
 223    dc.DrawLine( x+ 80, y, x+ 80, y+ 4 );
 224    dc.DrawLine( x+100, y, x+100, y+ 5 );
 225    dc.DrawLine( x+120, y, x+120, y+ 6 );
 226    dc.DrawLine( x+140, y, x+140, y+10 );
 227    dc.DrawLine( x+160, y, x+160, y+20 );
 228    dc.DrawLine( x+180, y, x+180, y+30 );
 229
 230    dc.DrawLine( x+200, y, x+200   , y    );
 231    dc.DrawLine( x+220, y, x+220+ 1, y+ 1 );
 232    dc.DrawLine( x+240, y, x+240+ 2, y+ 2 );
 233    dc.DrawLine( x+260, y, x+260+ 3, y+ 3 );
 234    dc.DrawLine( x+280, y, x+280+ 4, y+ 4 );
 235    dc.DrawLine( x+300, y, x+300+ 5, y+ 5 );
 236    dc.DrawLine( x+320, y, x+320+ 6, y+ 6 );
 237    dc.DrawLine( x+340, y, x+340+10, y+10 );
 238    dc.DrawLine( x+360, y, x+360+20, y+20 );
 239    dc.DrawLine( x+380, y, x+380+30, y+30 );
 240
 241    dc.DrawLine( x+420, y   , x+420  ,  y    );
 242    dc.DrawLine( x+420, y+10, x+420+1,  y+10 );
 243    dc.DrawLine( x+420, y+20, x+420+2,  y+20 );
 244    dc.DrawLine( x+420, y+30, x+420+3,  y+30 );
 245    dc.DrawLine( x+420, y+40, x+420+4,  y+40 );
 246    dc.DrawLine( x+420, y+50, x+420+5,  y+50 );
 247    dc.DrawLine( x+420, y+60, x+420+6,  y+60 );
 248    dc.DrawLine( x+420, y+70, x+420+10, y+70 );
 249    dc.DrawLine( x+420, y+80, x+420+20, y+80 );
 250    dc.DrawLine( x+420, y+90, x+420+30, y+90 );
 251
 252    y -= 40;
 253
 254    dc.DrawCircle( x, y+100, 1);
 255    dc.DrawCircle( x, y+110, 2);
 256    dc.DrawCircle( x, y+120, 3);
 257    dc.DrawCircle( x, y+130, 4);
 258    dc.DrawCircle( x, y+140, 5);
 259    dc.DrawCircle( x, y+160, 7);
 260    dc.DrawCircle( x, y+180, 8);
 261
 262    dc.DrawRectangle( x+50, y+100, 1, 1);
 263    dc.DrawRectangle( x+50, y+110, 2, 2);
 264    dc.DrawRectangle( x+50, y+120, 3, 3);
 265    dc.DrawRectangle( x+50, y+130, 4, 4);
 266    dc.DrawRectangle( x+50, y+140, 5, 5);
 267    dc.DrawRectangle( x+50, y+160, 10, 10);
 268    dc.DrawRectangle( x+50, y+180, 20, 20);
 269
 270    dc.DrawRoundedRectangle( x+100, y+100, 1, 1, 1);
 271    dc.DrawRoundedRectangle( x+100, y+110, 2, 2, 1);
 272    dc.DrawRoundedRectangle( x+100, y+120, 3, 3, 1);
 273    dc.DrawRoundedRectangle( x+100, y+130, 4, 4, 1);
 274    dc.DrawRoundedRectangle( x+100, y+140, 5, 5, 1);
 275    dc.DrawRoundedRectangle( x+100, y+160, 10, 10, 1);
 276    dc.DrawRoundedRectangle( x+100, y+180, 20, 20, 1);
 277
 278    dc.DrawRoundedRectangle( x+150, y+100, 1, 1, 2);
 279    dc.DrawRoundedRectangle( x+150, y+110, 2, 2, 2);
 280    dc.DrawRoundedRectangle( x+150, y+120, 3, 3, 2);
 281    dc.DrawRoundedRectangle( x+150, y+130, 4, 4, 2);
 282    dc.DrawRoundedRectangle( x+150, y+140, 5, 5, 2);
 283    dc.DrawRoundedRectangle( x+150, y+160, 10, 10, 2);
 284    dc.DrawRoundedRectangle( x+150, y+180, 20, 20, 2);
 285
 286    dc.DrawRoundedRectangle( x+200, y+100, 1, 1, 3);
 287    dc.DrawRoundedRectangle( x+200, y+110, 2, 2, 3);
 288    dc.DrawRoundedRectangle( x+200, y+120, 3, 3, 3);
 289    dc.DrawRoundedRectangle( x+200, y+130, 4, 4, 3);
 290    dc.DrawRoundedRectangle( x+200, y+140, 5, 5, 3);
 291    dc.DrawRoundedRectangle( x+200, y+160, 10, 10, 3);
 292    dc.DrawRoundedRectangle( x+200, y+180, 20, 20, 3);
 293
 294    dc.DrawRoundedRectangle( x+250, y+100, 1, 1, 5);
 295    dc.DrawRoundedRectangle( x+250, y+110, 2, 2, 5);
 296    dc.DrawRoundedRectangle( x+250, y+120, 3, 3, 5);
 297    dc.DrawRoundedRectangle( x+250, y+130, 4, 4, 5);
 298    dc.DrawRoundedRectangle( x+250, y+140, 5, 5, 5);
 299    dc.DrawRoundedRectangle( x+250, y+160, 10, 10, 5);
 300    dc.DrawRoundedRectangle( x+250, y+180, 20, 20, 5);
 301
 302    dc.DrawRoundedRectangle( x+300, y+100, 1, 1, 10);
 303    dc.DrawRoundedRectangle( x+300, y+110, 2, 2, 10);
 304    dc.DrawRoundedRectangle( x+300, y+120, 3, 3, 10);
 305    dc.DrawRoundedRectangle( x+300, y+130, 4, 4, 10);
 306    dc.DrawRoundedRectangle( x+300, y+140, 5, 5, 10);
 307    dc.DrawRoundedRectangle( x+300, y+160, 10, 10, 10);
 308    dc.DrawRoundedRectangle( x+300, y+180, 20, 20, 10);
 309
 310 }
 311
 312 void MyCanvas::OnPaint(wxPaintEvent &WXUNUSED(event))
 313 {
 314     wxPaintDC dc(this);
 315     PrepareDC(dc);
 316     m_owner->PrepareDC(dc);
 317
 318     dc.SetBackgroundMode( m_owner->m_backgroundMode );
 319     if ( m_owner->m_backgroundBrush.Ok() )
 320         dc.SetBackground( m_owner->m_backgroundBrush );
 321     if ( m_owner->m_colourForeground.Ok() )
 322         dc.SetTextForeground( m_owner->m_colourForeground );
 323     if ( m_owner->m_colourBackground.Ok() )
 324         dc.SetTextBackground( m_owner->m_colourBackground );
 325
 326     // mark the origin
 327     dc.DrawCircle(0, 0, 10);
 328 #ifndef __WXGTK__   // not implemented in wxGTK :-(
 329     dc.FloodFill(0, 0, wxColour(255, 0, 0));
 330 #endif // __WXGTK__
 331
 332     dc.DrawText( "This is text", 110, 10 );
 333
 334     dc.DrawIcon( wxICON(mondrian), 110, 40 );
 335
 336     dc.SetBrush( *wxRED_BRUSH );
 337
 338     int x = 20;
 339     int y = 80;
 340     int step = 200;
 341
 342     dc.SetPen( wxPen( "black", 1, 0) );
 343     DoDrawTests( x, y, dc );
 344
 345     y += step;
 346
 347     dc.SetPen( wxPen( "black", 1, wxDOT) );
 348     DoDrawTests( x, y, dc );
 349
 350     y += step;
 351
 352     dc.SetPen( wxPen( "black", 1, wxSHORT_DASH) );
 353     DoDrawTests( x, y, dc );
 354
 355     y += step;
 356
 357     dc.SetPen( wxPen( "black", 1, wxLONG_DASH) );
 358     DoDrawTests( x, y, dc );
 359
 360     y += step;
 361
 362     dc.SetPen( wxPen( "black", 1, wxDOT_DASH) );
 363     DoDrawTests( x, y, dc );
 364 }
 365
 366 // ----------------------------------------------------------------------------
 367 // MyFrame
 368 // ----------------------------------------------------------------------------
 369
 370 // the event tables connect the wxWindows events with the functions (event
 371 // handlers) which process them. It can be also done at run-time, but for the
 372 // simple menu events like this the static method is much simpler.
 373 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 374     EVT_MOTION    (MyFrame::OnMouseMove)
 375     EVT_MENU      (Minimal_Quit,     MyFrame::OnQuit)
 376     EVT_MENU      (Minimal_About,    MyFrame::OnAbout)
 377     EVT_MENU_RANGE(MenuOption_First, MenuOption_Last, MyFrame::OnOption)
 378 END_EVENT_TABLE()
 379
 380 // frame constructor
 381 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 382        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 383 {
 384     // set the frame icon
 385     SetIcon(wxICON(mondrian));
 386
 387     wxMenu *menuFile = new wxMenu;
 388     menuFile->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
 389     menuFile->AppendSeparator();
 390     menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 391
 392     wxMenu *menuMapMode = new wxMenu;
 393     menuMapMode->Append( MapMode_Text, "&TEXT map mode" );
 394     menuMapMode->Append( MapMode_Lometric, "&LOMETRIC map mode" );
 395     menuMapMode->Append( MapMode_Twips, "T&WIPS map mode" );
 396     menuMapMode->Append( MapMode_Points, "&POINTS map mode" );
 397     menuMapMode->Append( MapMode_Metric, "&METRIC map mode" );
 398
 399     wxMenu *menuUserScale = new wxMenu;
 400     menuUserScale->Append( UserScale_StretchHoriz, "Stretch horizontally\tCtrl-H" );
 401     menuUserScale->Append( UserScale_ShrinkHoriz, "Shrink  horizontally\tCtrl-G" );
 402     menuUserScale->Append( UserScale_StretchVertic, "Stretch vertically\tCtrl-V" );
 403     menuUserScale->Append( UserScale_ShrinkVertic, "Shrink vertically\tCtrl-W" );
 404     menuUserScale->AppendSeparator();
 405     menuUserScale->Append( UserScale_Restore, "Restore to normal\tCtrl-0" );
 406
 407     wxMenu *menuAxis = new wxMenu;
 408     menuAxis->Append( AxisMirror_Horiz, "Mirror horizontally\tCtrl-M", "", TRUE );
 409     menuAxis->Append( AxisMirror_Vertic, "Mirror vertically\tCtrl-N", "", TRUE );
 410
 411     wxMenu *menuLogical = new wxMenu;
 412     menuLogical->Append( LogicalOrigin_MoveDown, "Move &down\tCtrl-D" );
 413     menuLogical->Append( LogicalOrigin_MoveUp, "Move &up\tCtrl-U" );
 414     menuLogical->Append( LogicalOrigin_MoveLeft, "Move &right\tCtrl-L" );
 415     menuLogical->Append( LogicalOrigin_MoveRight, "Move &left\tCtrl-R" );
 416
 417     wxMenu *menuColour = new wxMenu;
 418     menuColour->Append( Colour_TextForeground, "Text foreground..." );
 419     menuColour->Append( Colour_TextBackground, "Text background..." );
 420     menuColour->Append( Colour_Background, "Background colour..." );
 421     menuColour->Append( Colour_BackgroundMode, "Opaque/transparent\tCtrl-B", "", TRUE );
 422
 423     // now append the freshly created menu to the menu bar...
 424     wxMenuBar *menuBar = new wxMenuBar;
 425     menuBar->Append(menuFile, "&File");
 426     menuBar->Append(menuMapMode, "&MapMode");
 427     menuBar->Append(menuUserScale, "&UserScale");
 428     menuBar->Append(menuAxis, "&Axis");
 429     menuBar->Append(menuLogical, "&LogicalOrigin");
 430     menuBar->Append(menuColour, "&Colours");
 431
 432     // ... and attach this menu bar to the frame
 433     SetMenuBar(menuBar);
 434
 435     // create a status bar just for fun (by default with 1 pane only)
 436     CreateStatusBar(2);
 437     SetStatusText("Welcome to wxWindows!");
 438
 439     m_mapMode = wxMM_TEXT;
 440     m_xUserScale = 1.0;
 441     m_yUserScale = 1.0;
 442     m_xLogicalOrigin = 0;
 443     m_yLogicalOrigin = 0;
 444     m_xAxisReversed =
 445     m_yAxisReversed = FALSE;
 446     m_backgroundMode = wxSOLID;
 447
 448     m_canvas = new MyCanvas( this );
 449     m_canvas->SetScrollbars( 10, 10, 100, 200 );
 450 }
 451
 452 // event handlers
 453
 454 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 455 {
 456     // TRUE is to force the frame to close
 457     Close(TRUE);
 458 }
 459
 460 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 461 {
 462     wxString msg;
 463     msg.Printf( _T("This is the about dialog of the drawing sample.\n")
 464                 _T("Copyright (c) Robert Roebling 1999")
 465               );
 466
 467     wxMessageBox(msg, "About Drawing", wxOK | wxICON_INFORMATION, this);
 468 }
 469
 470 void MyFrame::OnOption(wxCommandEvent &event)
 471 {
 472     switch (event.GetInt())
 473     {
 474         case MapMode_Text:
 475             m_mapMode = wxMM_TEXT;
 476             break;
 477         case MapMode_Lometric:
 478             m_mapMode = wxMM_LOMETRIC;
 479             break;
 480         case MapMode_Twips:
 481             m_mapMode = wxMM_TWIPS;
 482             break;
 483         case MapMode_Points:
 484             m_mapMode = wxMM_POINTS;
 485             break;
 486         case MapMode_Metric:
 487             m_mapMode = wxMM_METRIC;
 488             break;
 489
 490         case LogicalOrigin_MoveDown:
 491             m_yLogicalOrigin += 10;
 492             break;
 493         case LogicalOrigin_MoveUp:
 494             m_yLogicalOrigin -= 10;
 495             break;
 496         case LogicalOrigin_MoveLeft:
 497             m_xLogicalOrigin += 10;
 498             break;
 499         case LogicalOrigin_MoveRight:
 500             m_xLogicalOrigin -= 10;
 501             break;
 502
 503         case UserScale_StretchHoriz:
 504             m_xUserScale *= 1.10;
 505             break;
 506         case UserScale_ShrinkHoriz:
 507             m_xUserScale /= 1.10;
 508             break;
 509         case UserScale_StretchVertic:
 510             m_yUserScale *= 1.10;
 511             break;
 512         case UserScale_ShrinkVertic:
 513             m_yUserScale /= 1.10;
 514             break;
 515         case UserScale_Restore:
 516             m_xUserScale =
 517             m_yUserScale = 1.0;
 518             break;
 519
 520         case AxisMirror_Vertic:
 521             m_yAxisReversed = !m_yAxisReversed;
 522             break;
 523         case AxisMirror_Horiz:
 524             m_xAxisReversed = !m_xAxisReversed;
 525             break;
 526
 527         case Colour_TextForeground:
 528             m_colourForeground = SelectColour();
 529             break;
 530         case Colour_TextBackground:
 531             m_colourBackground = SelectColour();
 532             break;
 533         case Colour_Background:
 534             {
 535                 wxColour col = SelectColour();
 536                 if ( col.Ok() )
 537                 {
 538                     m_backgroundBrush.SetColour(col);
 539                 }
 540             }
 541             break;
 542         case Colour_BackgroundMode:
 543             m_backgroundMode = m_backgroundMode == wxSOLID ? wxTRANSPARENT
 544                                                            : wxSOLID;
 545             break;
 546
 547         default:
 548             // skip Refresh()
 549             return;
 550     }
 551
 552     Refresh();
 553 }
 554
 555 void MyFrame::PrepareDC(wxDC& dc)
 556 {
 557     dc.SetMapMode( m_mapMode );
 558     dc.SetUserScale( m_xUserScale, m_yUserScale );
 559     dc.SetLogicalOrigin( m_xLogicalOrigin, m_yLogicalOrigin );
 560     dc.SetAxisOrientation( !m_xAxisReversed, m_yAxisReversed );
 561 }
 562
 563 void MyFrame::OnMouseMove(wxMouseEvent &event)
 564 {
 565     wxClientDC dc(this);
 566     PrepareDC(dc);
 567
 568     wxPoint pos = event.GetPosition();
 569     long x = dc.DeviceToLogicalX( pos.x );
 570     long y = dc.DeviceToLogicalY( pos.y );
 571     wxString str;
 572     str.Printf( "Current mouse position: %d,%d", (int)x, (int)y );
 573     SetStatusText( str );
 574 }
 575
 576 wxColour MyFrame::SelectColour()
 577 {
 578     wxColour col;
 579     wxColourData data;
 580     wxColourDialog dialog(this, &data);
 581
 582     if ( dialog.ShowModal() == wxID_OK )
 583     {
 584         col = dialog.GetColourData().GetColour();
 585     }
 586
 587     return col;
 588 }