demos/life/life.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        life.cpp
   3 // Purpose:     The game of Life, created by J. H. Conway
   4 // Author:      Guillermo Rodriguez Garcia, <guille@iies.es>
   5 // Modified by:
   6 // Created:     Jan/2000
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2000, Guillermo Rodriguez Garcia
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ==========================================================================
  13 // headers, declarations, constants
  14 // ==========================================================================
  15
  16 // For compilers that support precompilation, includes "wx/wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20     #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/wx.h"
  25 #endif
  26
  27 #include "wx/statline.h"
  28 #include "wx/wfstream.h"
  29 #include "wx/filedlg.h"
  30 #include "wx/stockitem.h"
  31
  32 #include "life.h"
  33 #include "game.h"
  34 #include "dialogs.h"
  35 #include "reader.h"
  36
  37 // --------------------------------------------------------------------------
  38 // resources
  39 // --------------------------------------------------------------------------
  40
  41 #ifndef wxHAS_IMAGES_IN_RESOURCES
  42     // application icon
  43     #include "mondrian.xpm"
  44
  45     // bitmap buttons for the toolbar
  46     #include "bitmaps/reset.xpm"
  47     #include "bitmaps/open.xpm"
  48     #include "bitmaps/play.xpm"
  49     #include "bitmaps/stop.xpm"
  50     #include "bitmaps/zoomin.xpm"
  51     #include "bitmaps/zoomout.xpm"
  52     #include "bitmaps/info.xpm"
  53
  54     // navigator
  55     #include "bitmaps/north.xpm"
  56     #include "bitmaps/south.xpm"
  57     #include "bitmaps/east.xpm"
  58     #include "bitmaps/west.xpm"
  59     #include "bitmaps/center.xpm"
  60 #endif
  61
  62 // --------------------------------------------------------------------------
  63 // constants
  64 // --------------------------------------------------------------------------
  65
  66 // IDs for the controls and the menu commands. Exluding those already defined
  67 // by wxWidgets, such as wxID_NEW.
  68 enum
  69 {
  70     // timer
  71     ID_TIMER = wxID_HIGHEST,
  72
  73     // file menu
  74     ID_SAMPLES,
  75
  76     // view menu
  77     ID_SHOWNAV,
  78     ID_ORIGIN,
  79     ID_CENTER,
  80     ID_NORTH,
  81     ID_SOUTH,
  82     ID_EAST,
  83     ID_WEST,
  84     ID_INFO,
  85
  86     // game menu
  87     ID_START,
  88     ID_STEP,
  89     ID_TOPSPEED,
  90
  91     // speed selection slider
  92     ID_SLIDER
  93 };
  94
  95 // --------------------------------------------------------------------------
  96 // event tables and other macros for wxWidgets
  97 // --------------------------------------------------------------------------
  98
  99 // Event tables
 100 BEGIN_EVENT_TABLE(LifeFrame, wxFrame)
 101     EVT_MENU            (wxID_NEW,     LifeFrame::OnMenu)
 102 #if wxUSE_FILEDLG
 103     EVT_MENU            (wxID_OPEN,    LifeFrame::OnOpen)
 104 #endif
 105     EVT_MENU            (ID_SAMPLES,   LifeFrame::OnSamples)
 106     EVT_MENU            (wxID_ABOUT,   LifeFrame::OnMenu)
 107     EVT_MENU            (wxID_EXIT,    LifeFrame::OnMenu)
 108     EVT_MENU            (ID_SHOWNAV,   LifeFrame::OnMenu)
 109     EVT_MENU            (ID_ORIGIN,    LifeFrame::OnNavigate)
 110     EVT_BUTTON          (ID_CENTER,    LifeFrame::OnNavigate)
 111     EVT_BUTTON          (ID_NORTH,     LifeFrame::OnNavigate)
 112     EVT_BUTTON          (ID_SOUTH,     LifeFrame::OnNavigate)
 113     EVT_BUTTON          (ID_EAST,      LifeFrame::OnNavigate)
 114     EVT_BUTTON          (ID_WEST,      LifeFrame::OnNavigate)
 115     EVT_MENU            (wxID_ZOOM_IN, LifeFrame::OnZoom)
 116     EVT_MENU            (wxID_ZOOM_OUT,LifeFrame::OnZoom)
 117     EVT_MENU            (ID_INFO,      LifeFrame::OnMenu)
 118     EVT_MENU            (ID_START,     LifeFrame::OnMenu)
 119     EVT_MENU            (ID_STEP,      LifeFrame::OnMenu)
 120     EVT_MENU            (wxID_STOP,    LifeFrame::OnMenu)
 121     EVT_MENU            (ID_TOPSPEED,  LifeFrame::OnMenu)
 122     EVT_COMMAND_SCROLL  (ID_SLIDER,    LifeFrame::OnSlider)
 123     EVT_TIMER           (ID_TIMER,     LifeFrame::OnTimer)
 124     EVT_CLOSE           (              LifeFrame::OnClose)
 125 END_EVENT_TABLE()
 126
 127 BEGIN_EVENT_TABLE(LifeNavigator, wxMiniFrame)
 128     EVT_CLOSE           (             LifeNavigator::OnClose)
 129 END_EVENT_TABLE()
 130
 131 BEGIN_EVENT_TABLE(LifeCanvas, wxWindow)
 132     EVT_PAINT           (             LifeCanvas::OnPaint)
 133     EVT_SCROLLWIN       (             LifeCanvas::OnScroll)
 134     EVT_SIZE            (             LifeCanvas::OnSize)
 135     EVT_MOTION          (             LifeCanvas::OnMouse)
 136     EVT_LEFT_DOWN       (             LifeCanvas::OnMouse)
 137     EVT_LEFT_UP         (             LifeCanvas::OnMouse)
 138     EVT_LEFT_DCLICK     (             LifeCanvas::OnMouse)
 139     EVT_ERASE_BACKGROUND(             LifeCanvas::OnEraseBackground)
 140 END_EVENT_TABLE()
 141
 142
 143 // Create a new application object
 144 IMPLEMENT_APP(LifeApp)
 145
 146
 147 // ==========================================================================
 148 // implementation
 149 // ==========================================================================
 150
 151 // some shortcuts
 152 #define ADD_TOOL(id, bmp, tooltip, help) \
 153     toolBar->AddTool(id, wxEmptyString, bmp, wxNullBitmap, wxITEM_NORMAL, tooltip, help)
 154
 155
 156 // --------------------------------------------------------------------------
 157 // LifeApp
 158 // --------------------------------------------------------------------------
 159
 160 // 'Main program' equivalent: the program execution "starts" here
 161 bool LifeApp::OnInit()
 162 {
 163     // create the main application window
 164     LifeFrame *frame = new LifeFrame();
 165
 166     // show it
 167     frame->Show(true);
 168
 169     // just for Motif
 170 #ifdef __WXMOTIF__
 171     frame->UpdateInfoText();
 172 #endif
 173
 174     // enter the main message loop and run the app
 175     return true;
 176 }
 177
 178 // --------------------------------------------------------------------------
 179 // LifeFrame
 180 // --------------------------------------------------------------------------
 181
 182 // frame constructor
 183 LifeFrame::LifeFrame() :
 184   wxFrame( (wxFrame *) NULL, wxID_ANY, _("Life!"), wxDefaultPosition ),
 185   m_navigator(NULL)
 186 {
 187     // frame icon
 188     SetIcon(wxICON(mondrian));
 189
 190     // menu bar
 191     wxMenu *menuFile = new wxMenu(wxMENU_TEAROFF);
 192     wxMenu *menuView = new wxMenu(wxMENU_TEAROFF);
 193     wxMenu *menuGame = new wxMenu(wxMENU_TEAROFF);
 194     wxMenu *menuHelp = new wxMenu(wxMENU_TEAROFF);
 195
 196     menuFile->Append(wxID_NEW, wxEmptyString, _("Start a new game"));
 197 #if wxUSE_FILEDLG
 198     menuFile->Append(wxID_OPEN, wxEmptyString, _("Open an existing Life pattern"));
 199 #endif
 200     menuFile->Append(ID_SAMPLES, _("&Sample game..."), _("Select a sample configuration"));
 201 #if ! (defined(__SMARTPHONE__) || defined(__POCKETPC__))
 202     menuFile->AppendSeparator();
 203     menuFile->Append(wxID_EXIT);
 204
 205     menuView->Append(ID_SHOWNAV, _("Navigation &toolbox"), _("Show or hide toolbox"), wxITEM_CHECK);
 206     menuView->Check(ID_SHOWNAV, true);
 207     menuView->AppendSeparator();
 208 #endif
 209
 210     menuView->Append(ID_ORIGIN, _("&Absolute origin"), _("Go to (0, 0)"));
 211     menuView->Append(ID_CENTER, _("&Center of mass"), _("Find center of mass"));
 212     menuView->Append(ID_NORTH, _("&North"), _("Find northernmost cell"));
 213     menuView->Append(ID_SOUTH, _("&South"), _("Find southernmost cell"));
 214     menuView->Append(ID_EAST, _("&East"), _("Find easternmost cell"));
 215     menuView->Append(ID_WEST, _("&West"), _("Find westernmost cell"));
 216     menuView->AppendSeparator();
 217     menuView->Append(wxID_ZOOM_IN, wxEmptyString, _("Zoom in"));
 218     menuView->Append(wxID_ZOOM_OUT, wxEmptyString, _("Zoom out"));
 219     menuView->Append(ID_INFO, _("&Description\tCtrl-D"), _("View pattern description"));
 220
 221     menuGame->Append(ID_START, _("&Start\tCtrl-S"), _("Start"));
 222     menuGame->Append(ID_STEP, _("&Next\tCtrl-N"), _("Single step"));
 223     menuGame->Append(wxID_STOP, wxEmptyString, _("Stop"));
 224     menuGame->Enable(wxID_STOP, false);
 225     menuGame->AppendSeparator();
 226     menuGame->Append(ID_TOPSPEED, _("T&op speed!"), _("Go as fast as possible"));
 227
 228     menuHelp->Append(wxID_ABOUT, _("&About\tCtrl-A"), _("Show about dialog"));
 229
 230     wxMenuBar *menuBar = new wxMenuBar();
 231     menuBar->Append(menuFile, _("&File"));
 232     menuBar->Append(menuView, _("&View"));
 233     menuBar->Append(menuGame, _("&Game"));
 234     menuBar->Append(menuHelp, _("&Help"));
 235     SetMenuBar(menuBar);
 236
 237     // tool bar
 238     wxBitmap tbBitmaps[7];
 239
 240     tbBitmaps[0] = wxBITMAP(reset);
 241     tbBitmaps[1] = wxBITMAP(open);
 242     tbBitmaps[2] = wxBITMAP(zoomin);
 243     tbBitmaps[3] = wxBITMAP(zoomout);
 244     tbBitmaps[4] = wxBITMAP(info);
 245     tbBitmaps[5] = wxBITMAP(play);
 246     tbBitmaps[6] = wxBITMAP(stop);
 247
 248     wxToolBar *toolBar = CreateToolBar();
 249     toolBar->SetMargins(5, 5);
 250     toolBar->SetToolBitmapSize(wxSize(16, 16));
 251
 252     ADD_TOOL(wxID_NEW, tbBitmaps[0], wxGetStockLabel(wxID_NEW, wxSTOCK_NOFLAGS), _("Start a new game"));
 253 #ifndef __POCKETPC__
 254 #if wxUSE_FILEDLG
 255     ADD_TOOL(wxID_OPEN, tbBitmaps[1], wxGetStockLabel(wxID_OPEN, wxSTOCK_NOFLAGS), _("Open an existing Life pattern"));
 256 #endif // wxUSE_FILEDLG
 257
 258     toolBar->AddSeparator();
 259     ADD_TOOL(wxID_ZOOM_IN, tbBitmaps[2], wxGetStockLabel(wxID_ZOOM_IN, wxSTOCK_NOFLAGS), _("Zoom in"));
 260     ADD_TOOL(wxID_ZOOM_OUT, tbBitmaps[3], wxGetStockLabel(wxID_ZOOM_OUT, wxSTOCK_NOFLAGS), _("Zoom out"));
 261     ADD_TOOL(ID_INFO, tbBitmaps[4], _("Description"), _("Show description"));
 262     toolBar->AddSeparator();
 263 #endif // __POCKETPC__
 264     ADD_TOOL(ID_START, tbBitmaps[5], _("Start"), _("Start"));
 265     ADD_TOOL(wxID_STOP, tbBitmaps[6], _("Stop"), _("Stop"));
 266
 267     toolBar->Realize();
 268     toolBar->EnableTool(wxID_STOP, false);    // must be after Realize() !
 269
 270 #if wxUSE_STATUSBAR
 271     // status bar
 272     CreateStatusBar(2);
 273     SetStatusText(_("Welcome to Life!"));
 274 #endif // wxUSE_STATUSBAR
 275
 276     // game and timer
 277     m_life     = new Life();
 278     m_timer    = new wxTimer(this, ID_TIMER);
 279     m_running  = false;
 280     m_topspeed = false;
 281     m_interval = 500;
 282     m_tics     = 0;
 283
 284     // We use two different panels to reduce flicker in wxGTK, because
 285     // some widgets (like wxStaticText) don't have their own X11 window,
 286     // and thus updating the text would result in a refresh of the canvas
 287     // if they belong to the same parent.
 288
 289     wxPanel *panel1 = new wxPanel(this, wxID_ANY);
 290     wxPanel *panel2 = new wxPanel(this, wxID_ANY);
 291
 292     // canvas
 293     m_canvas = new LifeCanvas(panel1, m_life);
 294
 295     // info panel
 296     m_text = new wxStaticText(panel2, wxID_ANY,
 297         wxEmptyString,
 298         wxDefaultPosition,
 299         wxDefaultSize,
 300         wxALIGN_CENTER | wxST_NO_AUTORESIZE);
 301
 302     wxSlider *slider = new wxSlider(panel2, ID_SLIDER,
 303         5, 1, 10,
 304         wxDefaultPosition,
 305         wxSize(200, wxDefaultCoord),
 306         wxSL_HORIZONTAL | wxSL_AUTOTICKS);
 307
 308     UpdateInfoText();
 309
 310     // component layout
 311     wxBoxSizer *sizer1 = new wxBoxSizer(wxVERTICAL);
 312     wxBoxSizer *sizer2 = new wxBoxSizer(wxVERTICAL);
 313     wxBoxSizer *sizer3 = new wxBoxSizer(wxVERTICAL);
 314
 315 #if wxUSE_STATLINE
 316     sizer1->Add( new wxStaticLine(panel1, wxID_ANY), 0, wxGROW );
 317 #endif // wxUSE_STATLINE
 318     sizer1->Add( m_canvas, 1, wxGROW | wxALL, 2 );
 319 #if wxUSE_STATLINE
 320     sizer1->Add( new wxStaticLine(panel1, wxID_ANY), 0, wxGROW );
 321 #endif // wxUSE_STATLINE
 322     panel1->SetSizer( sizer1 );
 323     sizer1->Fit( panel1 );
 324
 325     sizer2->Add( m_text, 0, wxGROW | wxTOP, 4 );
 326     sizer2->Add( slider, 0, wxCENTRE | wxALL, 4 );
 327
 328     panel2->SetSizer( sizer2 );
 329     sizer2->Fit( panel2 );
 330
 331     sizer3->Add( panel1, 1, wxGROW );
 332     sizer3->Add( panel2, 0, wxGROW );
 333     SetSizer( sizer3 );
 334
 335 #ifndef __WXWINCE__
 336     sizer3->Fit( this );
 337
 338     // set minimum frame size
 339     sizer3->SetSizeHints( this );
 340
 341     // navigator frame - not appropriate for small devices
 342     m_navigator = new LifeNavigator(this);
 343 #endif
 344
 345 }
 346
 347 LifeFrame::~LifeFrame()
 348 {
 349     delete m_timer;
 350 }
 351
 352 void LifeFrame::UpdateInfoText()
 353 {
 354     wxString msg;
 355
 356     msg.Printf(_(" Generation: %lu (T: %lu ms),  Population: %lu "),
 357                m_tics,
 358                m_topspeed? 0 : m_interval,
 359                static_cast<unsigned long>(m_life->GetNumCells()));
 360     m_text->SetLabel(msg);
 361 }
 362
 363 // Enable or disable tools and menu entries according to the current
 364 // state. See also wxEVT_UPDATE_UI events for a slightly different
 365 // way to do this.
 366 void LifeFrame::UpdateUI()
 367 {
 368     // start / stop
 369     GetToolBar()->EnableTool(ID_START, !m_running);
 370     GetToolBar()->EnableTool(wxID_STOP,  m_running);
 371     GetMenuBar()->Enable(ID_START, !m_running);
 372     GetMenuBar()->Enable(ID_STEP,  !m_running);
 373     GetMenuBar()->Enable(wxID_STOP,  m_running);
 374     GetMenuBar()->Enable(ID_TOPSPEED, !m_topspeed);
 375
 376     // zooming
 377     int cellsize = m_canvas->GetCellSize();
 378     GetToolBar()->EnableTool(wxID_ZOOM_IN,  cellsize < 32);
 379     GetToolBar()->EnableTool(wxID_ZOOM_OUT, cellsize > 1);
 380     GetMenuBar()->Enable(wxID_ZOOM_IN,  cellsize < 32);
 381     GetMenuBar()->Enable(wxID_ZOOM_OUT, cellsize > 1);
 382 }
 383
 384 // Event handlers -----------------------------------------------------------
 385
 386 // OnMenu handles all events which don't have their own event handler
 387 void LifeFrame::OnMenu(wxCommandEvent& event)
 388 {
 389     switch (event.GetId())
 390     {
 391         case wxID_NEW:
 392         {
 393             // stop if it was running
 394             OnStop();
 395             m_life->Clear();
 396             m_canvas->Recenter(0, 0);
 397             m_tics = 0;
 398             UpdateInfoText();
 399             break;
 400         }
 401         case wxID_ABOUT:
 402         {
 403             LifeAboutDialog dialog(this);
 404             dialog.ShowModal();
 405             break;
 406         }
 407         case wxID_EXIT:
 408         {
 409             // true is to force the frame to close
 410             Close(true);
 411             break;
 412         }
 413         case ID_SHOWNAV:
 414         {
 415             bool checked = GetMenuBar()->GetMenu(1)->IsChecked(ID_SHOWNAV);
 416             if (m_navigator)
 417                 m_navigator->Show(checked);
 418             break;
 419         }
 420         case ID_INFO:
 421         {
 422             wxString desc = m_life->GetDescription();
 423
 424             if ( desc.empty() )
 425                 desc = _("Not available");
 426
 427             // should we make the description editable here?
 428             wxMessageBox(desc, _("Description"), wxOK | wxICON_INFORMATION);
 429
 430             break;
 431         }
 432         case ID_START   : OnStart(); break;
 433         case ID_STEP    : OnStep(); break;
 434         case wxID_STOP  : OnStop(); break;
 435         case ID_TOPSPEED:
 436         {
 437             m_running = true;
 438             m_topspeed = true;
 439             UpdateUI();
 440             while (m_running && m_topspeed)
 441             {
 442                 OnStep();
 443                 wxYield();
 444             }
 445             break;
 446         }
 447     }
 448 }
 449
 450 #if wxUSE_FILEDLG
 451 void LifeFrame::OnOpen(wxCommandEvent& WXUNUSED(event))
 452 {
 453     wxFileDialog filedlg(this,
 454                          _("Choose a file to open"),
 455                          wxEmptyString,
 456                          wxEmptyString,
 457                          _("Life patterns (*.lif)|*.lif|All files (*.*)|*.*"),
 458                          wxFD_OPEN | wxFD_FILE_MUST_EXIST);
 459
 460     if (filedlg.ShowModal() == wxID_OK)
 461     {
 462         wxFileInputStream stream(filedlg.GetPath());
 463         LifeReader reader(stream);
 464
 465         // the reader handles errors itself, no need to do anything here
 466         if (reader.IsOk())
 467         {
 468             // stop if running and put the pattern
 469             OnStop();
 470             m_life->Clear();
 471             m_life->SetPattern(reader.GetPattern());
 472
 473             // recenter canvas
 474             m_canvas->Recenter(0, 0);
 475             m_tics = 0;
 476             UpdateInfoText();
 477         }
 478     }
 479 }
 480 #endif
 481
 482 void LifeFrame::OnSamples(wxCommandEvent& WXUNUSED(event))
 483 {
 484     // stop if it was running
 485     OnStop();
 486
 487     // dialog box
 488     LifeSamplesDialog dialog(this);
 489
 490     if (dialog.ShowModal() == wxID_OK)
 491     {
 492         const LifePattern pattern = dialog.GetPattern();
 493
 494         // put the pattern
 495         m_life->Clear();
 496         m_life->SetPattern(pattern);
 497
 498         // recenter canvas
 499         m_canvas->Recenter(0, 0);
 500         m_tics = 0;
 501         UpdateInfoText();
 502     }
 503 }
 504
 505 void LifeFrame::OnZoom(wxCommandEvent& event)
 506 {
 507     int cellsize = m_canvas->GetCellSize();
 508
 509     if ((event.GetId() == wxID_ZOOM_IN) && cellsize < 32)
 510     {
 511         m_canvas->SetCellSize(cellsize * 2);
 512         UpdateUI();
 513     }
 514     else if ((event.GetId() == wxID_ZOOM_OUT) && cellsize > 1)
 515     {
 516         m_canvas->SetCellSize(cellsize / 2);
 517         UpdateUI();
 518     }
 519 }
 520
 521 void LifeFrame::OnNavigate(wxCommandEvent& event)
 522 {
 523     LifeCell c;
 524
 525     switch (event.GetId())
 526     {
 527         case ID_NORTH:  c = m_life->FindNorth(); break;
 528         case ID_SOUTH:  c = m_life->FindSouth(); break;
 529         case ID_WEST:   c = m_life->FindWest(); break;
 530         case ID_EAST:   c = m_life->FindEast(); break;
 531         case ID_CENTER: c = m_life->FindCenter(); break;
 532         default :
 533             wxFAIL;
 534             // Fall through!
 535         case ID_ORIGIN: c.i = c.j = 0; break;
 536     }
 537
 538     m_canvas->Recenter(c.i, c.j);
 539 }
 540
 541 void LifeFrame::OnSlider(wxScrollEvent& event)
 542 {
 543     m_interval = event.GetPosition() * 100;
 544
 545     if (m_running)
 546     {
 547         OnStop();
 548         OnStart();
 549     }
 550
 551     UpdateInfoText();
 552 }
 553
 554 void LifeFrame::OnTimer(wxTimerEvent& WXUNUSED(event))
 555 {
 556     OnStep();
 557 }
 558
 559 void LifeFrame::OnClose(wxCloseEvent& WXUNUSED(event))
 560 {
 561     // Stop if it was running; this is absolutely needed because
 562     // the frame won't be actually destroyed until there are no
 563     // more pending events, and this in turn won't ever happen
 564     // if the timer is running faster than the window can redraw.
 565     OnStop();
 566     Destroy();
 567 }
 568
 569 void LifeFrame::OnStart()
 570 {
 571     if (!m_running)
 572     {
 573         m_timer->Start(m_interval);
 574         m_running = true;
 575         UpdateUI();
 576     }
 577 }
 578
 579 void LifeFrame::OnStop()
 580 {
 581     if (m_running)
 582     {
 583         m_timer->Stop();
 584         m_running = false;
 585         m_topspeed = false;
 586         UpdateUI();
 587     }
 588 }
 589
 590 void LifeFrame::OnStep()
 591 {
 592     if (m_life->NextTic())
 593         m_tics++;
 594     else
 595         OnStop();
 596
 597     m_canvas->DrawChanged();
 598     UpdateInfoText();
 599 }
 600
 601
 602 // --------------------------------------------------------------------------
 603 // LifeNavigator miniframe
 604 // --------------------------------------------------------------------------
 605
 606 LifeNavigator::LifeNavigator(wxWindow *parent)
 607              : wxMiniFrame(parent, wxID_ANY,
 608                            _("Navigation"),
 609                            wxDefaultPosition,
 610                            wxDefaultSize,
 611                            wxCAPTION | wxSIMPLE_BORDER)
 612 {
 613     wxPanel    *panel  = new wxPanel(this, wxID_ANY);
 614     wxBoxSizer *sizer1 = new wxBoxSizer(wxVERTICAL);
 615     wxBoxSizer *sizer2 = new wxBoxSizer(wxHORIZONTAL);
 616
 617     // create bitmaps and masks for the buttons
 618     wxBitmap
 619         bmpn = wxBITMAP(north),
 620         bmpw = wxBITMAP(west),
 621         bmpc = wxBITMAP(center),
 622         bmpe = wxBITMAP(east),
 623         bmps = wxBITMAP(south);
 624
 625 #if !defined(__WXGTK__) && !defined(__WXMOTIF__) && !defined(__WXMAC__)
 626     bmpn.SetMask(new wxMask(bmpn, *wxLIGHT_GREY));
 627     bmpw.SetMask(new wxMask(bmpw, *wxLIGHT_GREY));
 628     bmpc.SetMask(new wxMask(bmpc, *wxLIGHT_GREY));
 629     bmpe.SetMask(new wxMask(bmpe, *wxLIGHT_GREY));
 630     bmps.SetMask(new wxMask(bmps, *wxLIGHT_GREY));
 631 #endif
 632
 633     // create the buttons and attach tooltips to them
 634     wxBitmapButton
 635         *bn = new wxBitmapButton(panel, ID_NORTH,  bmpn),
 636         *bw = new wxBitmapButton(panel, ID_WEST ,  bmpw),
 637         *bc = new wxBitmapButton(panel, ID_CENTER, bmpc),
 638         *be = new wxBitmapButton(panel, ID_EAST ,  bmpe),
 639         *bs = new wxBitmapButton(panel, ID_SOUTH,  bmps);
 640
 641 #if wxUSE_TOOLTIPS
 642     bn->SetToolTip(_("Find northernmost cell"));
 643     bw->SetToolTip(_("Find westernmost cell"));
 644     bc->SetToolTip(_("Find center of mass"));
 645     be->SetToolTip(_("Find easternmost cell"));
 646     bs->SetToolTip(_("Find southernmost cell"));
 647 #endif
 648
 649     // add buttons to sizers
 650     sizer2->Add( bw, 0, wxCENTRE | wxWEST,  4 );
 651     sizer2->Add( bc, 0, wxCENTRE);
 652     sizer2->Add( be, 0, wxCENTRE | wxEAST,  4 );
 653     sizer1->Add( bn, 0, wxCENTRE | wxNORTH, 4 );
 654     sizer1->Add( sizer2 );
 655     sizer1->Add( bs, 0, wxCENTRE | wxSOUTH, 4 );
 656
 657     // set the panel and miniframe size
 658     panel->SetSizer(sizer1);
 659
 660     sizer1->Fit(panel);
 661     SetClientSize(panel->GetSize());
 662     wxSize sz = GetSize();
 663     SetSizeHints(sz.x, sz.y, sz.x, sz.y);
 664
 665     // move it to a sensible position
 666     wxRect parentRect = parent->GetRect();
 667     wxSize childSize  = GetSize();
 668     int x = parentRect.GetX() +
 669             parentRect.GetWidth();
 670     int y = parentRect.GetY() +
 671             (parentRect.GetHeight() - childSize.GetHeight()) / 4;
 672     Move(x, y);
 673
 674     // done
 675     Show(true);
 676 }
 677
 678 void LifeNavigator::OnClose(wxCloseEvent& event)
 679 {
 680     // avoid if we can
 681     if (event.CanVeto())
 682         event.Veto();
 683     else
 684         Destroy();
 685 }
 686
 687
 688 // --------------------------------------------------------------------------
 689 // LifeCanvas
 690 // --------------------------------------------------------------------------
 691
 692 // canvas constructor
 693 LifeCanvas::LifeCanvas(wxWindow *parent, Life *life, bool interactive)
 694           : wxWindow(parent, wxID_ANY, wxDefaultPosition, wxSize(100, 100),
 695             wxFULL_REPAINT_ON_RESIZE | wxHSCROLL | wxVSCROLL
 696 #if !defined(__SMARTPHONE__) && !defined(__POCKETPC__)
 697             |wxSUNKEN_BORDER
 698 #else
 699             |wxSIMPLE_BORDER
 700 #endif
 701             )
 702 {
 703     m_life        = life;
 704     m_interactive = interactive;
 705     m_cellsize    = 8;
 706     m_status      = MOUSE_NOACTION;
 707     m_viewportX   = 0;
 708     m_viewportY   = 0;
 709     m_viewportH   = 0;
 710     m_viewportW   = 0;
 711
 712     if (m_interactive)
 713         SetCursor(*wxCROSS_CURSOR);
 714
 715     // reduce flicker if wxEVT_ERASE_BACKGROUND is not available
 716     SetBackgroundColour(*wxWHITE);
 717 }
 718
 719 LifeCanvas::~LifeCanvas()
 720 {
 721     delete m_life;
 722 }
 723
 724 // recenter at the given position
 725 void LifeCanvas::Recenter(wxInt32 i, wxInt32 j)
 726 {
 727     m_viewportX = i - m_viewportW / 2;
 728     m_viewportY = j - m_viewportH / 2;
 729
 730     // redraw everything
 731     Refresh(false);
 732 }
 733
 734 // set the cell size and refresh display
 735 void LifeCanvas::SetCellSize(int cellsize)
 736 {
 737     m_cellsize = cellsize;
 738
 739     // find current center
 740     wxInt32 cx = m_viewportX + m_viewportW / 2;
 741     wxInt32 cy = m_viewportY + m_viewportH / 2;
 742
 743     // get current canvas size and adjust viewport accordingly
 744     int w, h;
 745     GetClientSize(&w, &h);
 746     m_viewportW = (w + m_cellsize - 1) / m_cellsize;
 747     m_viewportH = (h + m_cellsize - 1) / m_cellsize;
 748
 749     // recenter
 750     m_viewportX = cx - m_viewportW / 2;
 751     m_viewportY = cy - m_viewportH / 2;
 752
 753     // adjust scrollbars
 754     if (m_interactive)
 755     {
 756         SetScrollbar(wxHORIZONTAL, m_viewportW, m_viewportW, 3 * m_viewportW);
 757         SetScrollbar(wxVERTICAL,   m_viewportH, m_viewportH, 3 * m_viewportH);
 758         m_thumbX = m_viewportW;
 759         m_thumbY = m_viewportH;
 760     }
 761
 762     Refresh(false);
 763 }
 764
 765 // draw a cell
 766 void LifeCanvas::DrawCell(wxInt32 i, wxInt32 j, bool alive)
 767 {
 768     wxClientDC dc(this);
 769
 770     dc.SetPen(alive? *wxBLACK_PEN : *wxWHITE_PEN);
 771     dc.SetBrush(alive? *wxBLACK_BRUSH : *wxWHITE_BRUSH);
 772
 773     DrawCell(i, j, dc);
 774 }
 775
 776 void LifeCanvas::DrawCell(wxInt32 i, wxInt32 j, wxDC &dc)
 777 {
 778     wxCoord x = CellToX(i);
 779     wxCoord y = CellToY(j);
 780
 781     // if cellsize is 1 or 2, there will be no grid
 782     switch (m_cellsize)
 783     {
 784         case 1:
 785             dc.DrawPoint(x, y);
 786             break;
 787         case 2:
 788             dc.DrawRectangle(x, y, 2, 2);
 789             break;
 790         default:
 791             dc.DrawRectangle(x + 1, y + 1, m_cellsize - 1, m_cellsize - 1);
 792     }
 793 }
 794
 795 // draw all changed cells
 796 void LifeCanvas::DrawChanged()
 797 {
 798     wxClientDC dc(this);
 799
 800     size_t ncells;
 801     LifeCell *cells;
 802     bool done = false;
 803
 804     m_life->BeginFind(m_viewportX,
 805                       m_viewportY,
 806                       m_viewportX + m_viewportW,
 807                       m_viewportY + m_viewportH,
 808                       true);
 809
 810     if (m_cellsize == 1)
 811     {
 812         dc.SetPen(*wxBLACK_PEN);
 813     }
 814     else
 815     {
 816         dc.SetPen(*wxTRANSPARENT_PEN);
 817         dc.SetBrush(*wxBLACK_BRUSH);
 818     }
 819     dc.SetLogicalFunction(wxINVERT);
 820
 821     while (!done)
 822     {
 823         done = m_life->FindMore(&cells, &ncells);
 824
 825         for (size_t m = 0; m < ncells; m++)
 826             DrawCell(cells[m].i, cells[m].j, dc);
 827     }
 828 }
 829
 830 // event handlers
 831 void LifeCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
 832 {
 833     wxPaintDC dc(this);
 834     wxRect  rect = GetUpdateRegion().GetBox();
 835     wxCoord x, y, w, h;
 836     wxInt32 i0, j0, i1, j1;
 837
 838     // find damaged area
 839     x = rect.GetX();
 840     y = rect.GetY();
 841     w = rect.GetWidth();
 842     h = rect.GetHeight();
 843
 844     i0 = XToCell(x);
 845     j0 = YToCell(y);
 846     i1 = XToCell(x + w - 1);
 847     j1 = YToCell(y + h - 1);
 848
 849     size_t ncells;
 850     LifeCell *cells;
 851
 852     m_life->BeginFind(i0, j0, i1, j1, false);
 853     bool done = m_life->FindMore(&cells, &ncells);
 854
 855     // erase all damaged cells and draw the grid
 856     dc.SetBrush(*wxWHITE_BRUSH);
 857
 858     if (m_cellsize <= 2)
 859     {
 860        // no grid
 861        dc.SetPen(*wxWHITE_PEN);
 862        dc.DrawRectangle(x, y, w, h);
 863     }
 864     else
 865     {
 866         x = CellToX(i0);
 867         y = CellToY(j0);
 868         w = CellToX(i1 + 1) - x + 1;
 869         h = CellToY(j1 + 1) - y + 1;
 870
 871         dc.SetPen(*wxLIGHT_GREY_PEN);
 872         for (wxInt32 yy = y; yy <= (y + h - m_cellsize); yy += m_cellsize)
 873             dc.DrawRectangle(x, yy, w, m_cellsize + 1);
 874         for (wxInt32 xx = x; xx <= (x + w - m_cellsize); xx += m_cellsize)
 875             dc.DrawLine(xx, y, xx, y + h);
 876     }
 877
 878     // draw all alive cells
 879     dc.SetPen(*wxBLACK_PEN);
 880     dc.SetBrush(*wxBLACK_BRUSH);
 881
 882     while (!done)
 883     {
 884         for (size_t m = 0; m < ncells; m++)
 885             DrawCell(cells[m].i, cells[m].j, dc);
 886
 887         done = m_life->FindMore(&cells, &ncells);
 888     }
 889
 890     // last set
 891     for (size_t m = 0; m < ncells; m++)
 892         DrawCell(cells[m].i, cells[m].j, dc);
 893 }
 894
 895 void LifeCanvas::OnMouse(wxMouseEvent& event)
 896 {
 897     if (!m_interactive)
 898         return;
 899
 900     // which cell are we pointing at?
 901     wxInt32 i = XToCell( event.GetX() );
 902     wxInt32 j = YToCell( event.GetY() );
 903
 904 #if wxUSE_STATUSBAR
 905     // set statusbar text
 906     wxString msg;
 907     msg.Printf(_("Cell: (%d, %d)"), i, j);
 908     ((LifeFrame *) wxGetApp().GetTopWindow())->SetStatusText(msg, 1);
 909 #endif // wxUSE_STATUSBAR
 910
 911     // NOTE that wxMouseEvent::LeftDown() and wxMouseEvent::LeftIsDown()
 912     // have different semantics. The first one is used to signal that the
 913     // button was just pressed (i.e., in "button down" events); the second
 914     // one just describes the current status of the button, independently
 915     // of the mouse event type. LeftIsDown is typically used in "mouse
 916     // move" events, to test if the button is _still_ pressed.
 917
 918     // is the button down?
 919     if (!event.LeftIsDown())
 920     {
 921         m_status = MOUSE_NOACTION;
 922         return;
 923     }
 924
 925     // was it pressed just now?
 926     if (event.LeftDown())
 927     {
 928         // yes: start a new action and toggle this cell
 929         m_status = (m_life->IsAlive(i, j)? MOUSE_ERASING : MOUSE_DRAWING);
 930
 931         m_mi = i;
 932         m_mj = j;
 933         m_life->SetCell(i, j, m_status == MOUSE_DRAWING);
 934         DrawCell(i, j, m_status == MOUSE_DRAWING);
 935     }
 936     else if ((m_mi != i) || (m_mj != j))
 937     {
 938         // no: continue ongoing action
 939         bool alive = (m_status == MOUSE_DRAWING);
 940
 941         // prepare DC and pen + brush to optimize drawing
 942         wxClientDC dc(this);
 943         dc.SetPen(alive? *wxBLACK_PEN : *wxWHITE_PEN);
 944         dc.SetBrush(alive? *wxBLACK_BRUSH : *wxWHITE_BRUSH);
 945
 946         // draw a line of cells using Bresenham's algorithm
 947         wxInt32 d, ii, jj, di, ai, si, dj, aj, sj;
 948         di = i - m_mi;
 949         ai = abs(di) << 1;
 950         si = (di < 0)? -1 : 1;
 951         dj = j - m_mj;
 952         aj = abs(dj) << 1;
 953         sj = (dj < 0)? -1 : 1;
 954
 955         ii = m_mi;
 956         jj = m_mj;
 957
 958         if (ai > aj)
 959         {
 960             // iterate over i
 961             d = aj - (ai >> 1);
 962
 963             while (ii != i)
 964             {
 965                 m_life->SetCell(ii, jj, alive);
 966                 DrawCell(ii, jj, dc);
 967                 if (d >= 0)
 968                 {
 969                     jj += sj;
 970                     d  -= ai;
 971                 }
 972                 ii += si;
 973                 d  += aj;
 974             }
 975         }
 976         else
 977         {
 978             // iterate over j
 979             d = ai - (aj >> 1);
 980
 981             while (jj != j)
 982             {
 983                 m_life->SetCell(ii, jj, alive);
 984                 DrawCell(ii, jj, dc);
 985                 if (d >= 0)
 986                 {
 987                     ii += si;
 988                     d  -= aj;
 989                 }
 990                 jj += sj;
 991                 d  += ai;
 992             }
 993         }
 994
 995         // last cell
 996         m_life->SetCell(ii, jj, alive);
 997         DrawCell(ii, jj, dc);
 998         m_mi = ii;
 999         m_mj = jj;
1000     }
1001
1002     ((LifeFrame *) wxGetApp().GetTopWindow())->UpdateInfoText();
1003 }
1004
1005 void LifeCanvas::OnSize(wxSizeEvent& event)
1006 {
1007     // find center
1008     wxInt32 cx = m_viewportX + m_viewportW / 2;
1009     wxInt32 cy = m_viewportY + m_viewportH / 2;
1010
1011     // get new size
1012     wxCoord w = event.GetSize().GetX();
1013     wxCoord h = event.GetSize().GetY();
1014     m_viewportW = (w + m_cellsize - 1) / m_cellsize;
1015     m_viewportH = (h + m_cellsize - 1) / m_cellsize;
1016
1017     // recenter
1018     m_viewportX = cx - m_viewportW / 2;
1019     m_viewportY = cy - m_viewportH / 2;
1020
1021     // scrollbars
1022     if (m_interactive)
1023     {
1024         SetScrollbar(wxHORIZONTAL, m_viewportW, m_viewportW, 3 * m_viewportW);
1025         SetScrollbar(wxVERTICAL,   m_viewportH, m_viewportH, 3 * m_viewportH);
1026         m_thumbX = m_viewportW;
1027         m_thumbY = m_viewportH;
1028     }
1029
1030     // allow default processing
1031     event.Skip();
1032 }
1033
1034 void LifeCanvas::OnScroll(wxScrollWinEvent& event)
1035 {
1036     WXTYPE type = (WXTYPE)event.GetEventType();
1037     int pos     = event.GetPosition();
1038     int orient  = event.GetOrientation();
1039
1040     // calculate scroll increment
1041     int scrollinc = 0;
1042     if (type == wxEVT_SCROLLWIN_TOP)
1043     {
1044         if (orient == wxHORIZONTAL)
1045             scrollinc = -m_viewportW;
1046         else
1047             scrollinc = -m_viewportH;
1048     }
1049     else
1050     if (type == wxEVT_SCROLLWIN_BOTTOM)
1051     {
1052         if (orient == wxHORIZONTAL)
1053             scrollinc = m_viewportW;
1054         else
1055             scrollinc = m_viewportH;
1056     }
1057     else
1058     if (type == wxEVT_SCROLLWIN_LINEUP)
1059     {
1060         scrollinc = -1;
1061     }
1062     else
1063     if (type == wxEVT_SCROLLWIN_LINEDOWN)
1064     {
1065         scrollinc = +1;
1066     }
1067     else
1068     if (type == wxEVT_SCROLLWIN_PAGEUP)
1069     {
1070         scrollinc = -10;
1071     }
1072     else
1073     if (type == wxEVT_SCROLLWIN_PAGEDOWN)
1074     {
1075         scrollinc = +10;
1076     }
1077     else
1078     if (type == wxEVT_SCROLLWIN_THUMBTRACK)
1079     {
1080         if (orient == wxHORIZONTAL)
1081         {
1082             scrollinc = pos - m_thumbX;
1083             m_thumbX = pos;
1084         }
1085         else
1086         {
1087             scrollinc = pos - m_thumbY;
1088             m_thumbY = pos;
1089         }
1090     }
1091     else
1092     if (type == wxEVT_SCROLLWIN_THUMBRELEASE)
1093     {
1094         m_thumbX = m_viewportW;
1095         m_thumbY = m_viewportH;
1096     }
1097
1098 #if defined(__WXGTK__) || defined(__WXMOTIF__)
1099     // wxGTK and wxMotif update the thumb automatically (wxMSW doesn't);
1100     // so reset it back as we always want it to be in the same position.
1101     if (type != wxEVT_SCROLLWIN_THUMBTRACK)
1102     {
1103         SetScrollbar(wxHORIZONTAL, m_viewportW, m_viewportW, 3 * m_viewportW);
1104         SetScrollbar(wxVERTICAL,   m_viewportH, m_viewportH, 3 * m_viewportH);
1105     }
1106 #endif
1107
1108     if (scrollinc == 0) return;
1109
1110     // scroll the window and adjust the viewport
1111     if (orient == wxHORIZONTAL)
1112     {
1113         m_viewportX += scrollinc;
1114         ScrollWindow( -m_cellsize * scrollinc, 0, (const wxRect *) NULL);
1115     }
1116     else
1117     {
1118         m_viewportY += scrollinc;
1119         ScrollWindow( 0, -m_cellsize * scrollinc, (const wxRect *) NULL);
1120     }
1121 }
1122
1123 void LifeCanvas::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
1124 {
1125     // do nothing. I just don't want the background to be erased, you know.
1126 }