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 DrawTestLines( int x, int y, int width, 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::DrawTestLines( int x, int y, int width, wxDC &dc )
 211 {
 212     dc.SetPen( wxPen( "black", width, wxSOLID) );
 213     dc.SetBrush( *wxRED_BRUSH );
 214     dc.DrawRectangle( x+10, y+10, 400, 190 );
 215
 216     dc.SetPen( wxPen( "black", width, wxSOLID) );
 217     dc.DrawLine( x+20, y+20, 390, y+20 );
 218     dc.SetPen( wxPen( "black", width, wxDOT) );
 219     dc.DrawLine( x+20, y+30, 390, y+30 );
 220     dc.SetPen( wxPen( "black", width, wxSHORT_DASH) );
 221     dc.DrawLine( x+20, y+40, 390, y+40 );
 222     dc.SetPen( wxPen( "black", width, wxLONG_DASH) );
 223     dc.DrawLine( x+20, y+50, 390, y+50 );
 224     dc.SetPen( wxPen( "black", width, wxDOT_DASH) );
 225     dc.DrawLine( x+20, y+60, 390, y+60 );
 226
 227     dc.SetPen( wxPen( "black", width, wxBDIAGONAL_HATCH) );
 228     dc.DrawLine( x+20, y+70, 390, y+70 );
 229     dc.SetPen( wxPen( "black", width, wxCROSSDIAG_HATCH) );
 230     dc.DrawLine( x+20, y+80, 390, y+80 );
 231     dc.SetPen( wxPen( "black", width, wxFDIAGONAL_HATCH) );
 232     dc.DrawLine( x+20, y+90, 390, y+90 );
 233     dc.SetPen( wxPen( "black", width, wxCROSS_HATCH) );
 234     dc.DrawLine( x+20, y+100, 390, y+100 );
 235     dc.SetPen( wxPen( "black", width, wxHORIZONTAL_HATCH) );
 236     dc.DrawLine( x+20, y+110, 390, y+110 );
 237     dc.SetPen( wxPen( "black", width, wxVERTICAL_HATCH) );
 238     dc.DrawLine( x+20, y+120, 390, y+120 );
 239
 240     wxPen ud( "black", width, wxUSER_DASH );
 241     wxDash dash1[1];
 242     dash1[0] = 0;
 243     ud.SetDashes( 1, dash1 );
 244     dc.DrawLine( x+20, y+140, 390, y+140 );
 245     dash1[0] = 1;
 246     ud.SetDashes( 1, dash1 );
 247     dc.DrawLine( x+20, y+150, 390, y+150 );
 248     dash1[0] = 2;
 249     ud.SetDashes( 1, dash1 );
 250     dc.DrawLine( x+20, y+160, 390, y+160 );
 251     dash1[0] = 0xFF;
 252     ud.SetDashes( 1, dash1 );
 253     dc.DrawLine( x+20, y+170, 390, y+170 );
 254
 255 }
 256
 257 void MyCanvas::OnPaint(wxPaintEvent &WXUNUSED(event))
 258 {
 259     wxPaintDC dc(this);
 260     PrepareDC(dc);
 261     m_owner->PrepareDC(dc);
 262
 263     dc.SetBackgroundMode( m_owner->m_backgroundMode );
 264     if ( m_owner->m_backgroundBrush.Ok() )
 265         dc.SetBackground( m_owner->m_backgroundBrush );
 266     if ( m_owner->m_colourForeground.Ok() )
 267         dc.SetTextForeground( m_owner->m_colourForeground );
 268     if ( m_owner->m_colourBackground.Ok() )
 269         dc.SetTextBackground( m_owner->m_colourBackground );
 270
 271     // mark the origin
 272     dc.DrawCircle(0, 0, 10);
 273 #ifndef __WXGTK__   // not implemented in wxGTK :-(
 274     dc.FloodFill(0, 0, wxColour(255, 0, 0));
 275 #endif // __WXGTK__
 276
 277     dc.DrawText( "This is text", 110, 10 );
 278
 279     dc.SetFont( wxFont( 18, wxSWISS, 0, 0 ) );
 280
 281     dc.DrawText( "This is Swiss 18pt text.", 110, 40 );
 282
 283     long length;
 284     long height;
 285     long descent;
 286     dc.GetTextExtent( "This is Swiss 18pt text.", &length, &height, &descent );
 287     wxString text;
 288     text.Printf( "Dimensions are length %ld, height %ld, descent %ld", length, height, descent );
 289     dc.DrawText( text, 110, 80 );
 290
 291     dc.DrawRectangle( 100, 40, 4, height );
 292
 293     text.Printf( "CharHeight() returns: %d", dc.GetCharHeight() );
 294     dc.DrawText( text, 110, 120 );
 295
 296
 297     dc.DrawIcon( wxICON(mondrian), 310, 40 );
 298
 299     DrawTestLines( 0, 200, 0, dc );
 300
 301     DrawTestLines( 0, 400, 1, dc );
 302
 303     DrawTestLines( 0, 600, 2, dc );
 304
 305     DrawTestLines( 0, 800, 6, dc );
 306
 307 }
 308
 309 // ----------------------------------------------------------------------------
 310 // MyFrame
 311 // ----------------------------------------------------------------------------
 312
 313 // the event tables connect the wxWindows events with the functions (event
 314 // handlers) which process them. It can be also done at run-time, but for the
 315 // simple menu events like this the static method is much simpler.
 316 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 317     EVT_MOTION    (MyFrame::OnMouseMove)
 318     EVT_MENU      (Minimal_Quit,     MyFrame::OnQuit)
 319     EVT_MENU      (Minimal_About,    MyFrame::OnAbout)
 320     EVT_MENU_RANGE(MenuOption_First, MenuOption_Last, MyFrame::OnOption)
 321 END_EVENT_TABLE()
 322
 323 // frame constructor
 324 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 325        : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 326 {
 327     // set the frame icon
 328     SetIcon(wxICON(mondrian));
 329
 330     wxMenu *menuFile = new wxMenu;
 331     menuFile->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
 332     menuFile->AppendSeparator();
 333     menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 334
 335     wxMenu *menuMapMode = new wxMenu;
 336     menuMapMode->Append( MapMode_Text, "&TEXT map mode" );
 337     menuMapMode->Append( MapMode_Lometric, "&LOMETRIC map mode" );
 338     menuMapMode->Append( MapMode_Twips, "T&WIPS map mode" );
 339     menuMapMode->Append( MapMode_Points, "&POINTS map mode" );
 340     menuMapMode->Append( MapMode_Metric, "&METRIC map mode" );
 341
 342     wxMenu *menuUserScale = new wxMenu;
 343     menuUserScale->Append( UserScale_StretchHoriz, "Stretch horizontally\tCtrl-H" );
 344     menuUserScale->Append( UserScale_ShrinkHoriz, "Shrink  horizontally\tCtrl-G" );
 345     menuUserScale->Append( UserScale_StretchVertic, "Stretch vertically\tCtrl-V" );
 346     menuUserScale->Append( UserScale_ShrinkVertic, "Shrink vertically\tCtrl-W" );
 347     menuUserScale->AppendSeparator();
 348     menuUserScale->Append( UserScale_Restore, "Restore to normal\tCtrl-0" );
 349
 350     wxMenu *menuAxis = new wxMenu;
 351     menuAxis->Append( AxisMirror_Horiz, "Mirror horizontally\tCtrl-M", "", TRUE );
 352     menuAxis->Append( AxisMirror_Vertic, "Mirror vertically\tCtrl-N", "", TRUE );
 353
 354     wxMenu *menuLogical = new wxMenu;
 355     menuLogical->Append( LogicalOrigin_MoveDown, "Move &down\tCtrl-D" );
 356     menuLogical->Append( LogicalOrigin_MoveUp, "Move &up\tCtrl-U" );
 357     menuLogical->Append( LogicalOrigin_MoveLeft, "Move &right\tCtrl-L" );
 358     menuLogical->Append( LogicalOrigin_MoveRight, "Move &left\tCtrl-R" );
 359
 360     wxMenu *menuColour = new wxMenu;
 361     menuColour->Append( Colour_TextForeground, "Text foreground..." );
 362     menuColour->Append( Colour_TextBackground, "Text background..." );
 363     menuColour->Append( Colour_Background, "Background colour..." );
 364     menuColour->Append( Colour_BackgroundMode, "Opaque/transparent\tCtrl-B", "", TRUE );
 365
 366     // now append the freshly created menu to the menu bar...
 367     wxMenuBar *menuBar = new wxMenuBar;
 368     menuBar->Append(menuFile, "&File");
 369     menuBar->Append(menuMapMode, "&MapMode");
 370     menuBar->Append(menuUserScale, "&UserScale");
 371     menuBar->Append(menuAxis, "&Axis");
 372     menuBar->Append(menuLogical, "&LogicalOrigin");
 373     menuBar->Append(menuColour, "&Colours");
 374
 375     // ... and attach this menu bar to the frame
 376     SetMenuBar(menuBar);
 377
 378     // create a status bar just for fun (by default with 1 pane only)
 379     CreateStatusBar(2);
 380     SetStatusText("Welcome to wxWindows!");
 381
 382     m_mapMode = wxMM_TEXT;
 383     m_xUserScale = 1.0;
 384     m_yUserScale = 1.0;
 385     m_xLogicalOrigin = 0;
 386     m_yLogicalOrigin = 0;
 387     m_xAxisReversed =
 388     m_yAxisReversed = FALSE;
 389     m_backgroundMode = wxSOLID;
 390
 391     m_canvas = new MyCanvas( this );
 392     m_canvas->SetScrollbars( 10, 10, 100, 200 );
 393 }
 394
 395 // event handlers
 396
 397 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 398 {
 399     // TRUE is to force the frame to close
 400     Close(TRUE);
 401 }
 402
 403 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 404 {
 405     wxString msg;
 406     msg.Printf( _T("This is the about dialog of the drawing sample.\n")
 407                 _T("Copyright (c) Robert Roebling 1999")
 408               );
 409
 410     wxMessageBox(msg, "About Drawing", wxOK | wxICON_INFORMATION, this);
 411 }
 412
 413 void MyFrame::OnOption(wxCommandEvent &event)
 414 {
 415     switch (event.GetInt())
 416     {
 417         case MapMode_Text:
 418             m_mapMode = wxMM_TEXT;
 419             break;
 420         case MapMode_Lometric:
 421             m_mapMode = wxMM_LOMETRIC;
 422             break;
 423         case MapMode_Twips:
 424             m_mapMode = wxMM_TWIPS;
 425             break;
 426         case MapMode_Points:
 427             m_mapMode = wxMM_POINTS;
 428             break;
 429         case MapMode_Metric:
 430             m_mapMode = wxMM_METRIC;
 431             break;
 432
 433         case LogicalOrigin_MoveDown:
 434             m_yLogicalOrigin += 10;
 435             break;
 436         case LogicalOrigin_MoveUp:
 437             m_yLogicalOrigin -= 10;
 438             break;
 439         case LogicalOrigin_MoveLeft:
 440             m_xLogicalOrigin += 10;
 441             break;
 442         case LogicalOrigin_MoveRight:
 443             m_xLogicalOrigin -= 10;
 444             break;
 445
 446         case UserScale_StretchHoriz:
 447             m_xUserScale *= 1.10;
 448             break;
 449         case UserScale_ShrinkHoriz:
 450             m_xUserScale /= 1.10;
 451             break;
 452         case UserScale_StretchVertic:
 453             m_yUserScale *= 1.10;
 454             break;
 455         case UserScale_ShrinkVertic:
 456             m_yUserScale /= 1.10;
 457             break;
 458         case UserScale_Restore:
 459             m_xUserScale =
 460             m_yUserScale = 1.0;
 461             break;
 462
 463         case AxisMirror_Vertic:
 464             m_yAxisReversed = !m_yAxisReversed;
 465             break;
 466         case AxisMirror_Horiz:
 467             m_xAxisReversed = !m_xAxisReversed;
 468             break;
 469
 470         case Colour_TextForeground:
 471             m_colourForeground = SelectColour();
 472             break;
 473         case Colour_TextBackground:
 474             m_colourBackground = SelectColour();
 475             break;
 476         case Colour_Background:
 477             {
 478                 wxColour col = SelectColour();
 479                 if ( col.Ok() )
 480                 {
 481                     m_backgroundBrush.SetColour(col);
 482                 }
 483             }
 484             break;
 485         case Colour_BackgroundMode:
 486             m_backgroundMode = m_backgroundMode == wxSOLID ? wxTRANSPARENT
 487                                                            : wxSOLID;
 488             break;
 489
 490         default:
 491             // skip Refresh()
 492             return;
 493     }
 494
 495     m_canvas->Refresh();
 496 }
 497
 498 void MyFrame::PrepareDC(wxDC& dc)
 499 {
 500     dc.SetMapMode( m_mapMode );
 501     dc.SetUserScale( m_xUserScale, m_yUserScale );
 502     dc.SetLogicalOrigin( m_xLogicalOrigin, m_yLogicalOrigin );
 503     dc.SetAxisOrientation( !m_xAxisReversed, m_yAxisReversed );
 504 }
 505
 506 void MyFrame::OnMouseMove(wxMouseEvent &event)
 507 {
 508     wxClientDC dc(this);
 509     PrepareDC(dc);
 510
 511     wxPoint pos = event.GetPosition();
 512     long x = dc.DeviceToLogicalX( pos.x );
 513     long y = dc.DeviceToLogicalY( pos.y );
 514     wxString str;
 515     str.Printf( "Current mouse position: %d,%d", (int)x, (int)y );
 516     SetStatusText( str );
 517 }
 518
 519 wxColour MyFrame::SelectColour()
 520 {
 521     wxColour col;
 522     wxColourData data;
 523     wxColourDialog dialog(this, &data);
 524
 525     if ( dialog.ShowModal() == wxID_OK )
 526     {
 527         col = dialog.GetColourData().GetColour();
 528     }
 529
 530     return col;
 531 }