]> git.saurik.com Git - wxWidgets.git/blobdiff - demos/life/life.cpp
backported HTML tables horizontal size fix
[wxWidgets.git] / demos / life / life.cpp
index b65451f8b557a2712327a178c986fc60fb7e66d1..b6d1a7ae58e381a8af483591e169fb354cfd15af 100644 (file)
@@ -1,6 +1,6 @@
 /////////////////////////////////////////////////////////////////////////////
 // Name:        life.cpp
-// Purpose:     The game of life, created by J. H. Conway
+// Purpose:     The game of Life, created by J. H. Conway
 // Author:      Guillermo Rodriguez Garcia, <guille@iies.es>
 // Modified by:
 // Created:     Jan/2000
     #pragma implementation "life.h"
 #endif
 
+// For compilers that support precompilation, includes "wx/wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+    #include "wx/wx.h"
+#endif
+
 #include "wx/statline.h"
+#include "wx/wfstream.h"
+#include "wx/filedlg.h"
 
 #include "life.h"
 #include "game.h"
 #include "dialogs.h"
+#include "reader.h"
 
 // --------------------------------------------------------------------------
 // resources
 // --------------------------------------------------------------------------
 
-#if defined(__WXGTK__) || defined(__WXMOTIF__)
-    // the application icon
+#if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__)
+    // application icon
     #include "mondrian.xpm"
 
     // bitmap buttons for the toolbar
     #include "bitmaps/reset.xpm"
+    #include "bitmaps/open.xpm"
     #include "bitmaps/play.xpm"
     #include "bitmaps/stop.xpm"
     #include "bitmaps/zoomin.xpm"
     #include "bitmaps/zoomout.xpm"
+    #include "bitmaps/info.xpm"
+
+    // navigator
+    #include "bitmaps/north.xpm"
+    #include "bitmaps/south.xpm"
+    #include "bitmaps/east.xpm"
+    #include "bitmaps/west.xpm"
+    #include "bitmaps/center.xpm"
 #endif
 
 // --------------------------------------------------------------------------
 // IDs for the controls and the menu commands
 enum
 {
-    // menu items and toolbar buttons
-    ID_RESET = 1001,
+    // timer
+    ID_TIMER = 1001,
+
+    // file menu
+    ID_NEW,
+    ID_OPEN,
     ID_SAMPLES,
     ID_ABOUT,
     ID_EXIT,
+
+    // view menu
+    ID_SHOWNAV,
+    ID_ORIGIN,
     ID_CENTER,
+    ID_NORTH,
+    ID_SOUTH,
+    ID_EAST,
+    ID_WEST,
+    ID_ZOOMIN,
+    ID_ZOOMOUT,
+    ID_INFO,
+
+    // game menu
     ID_START,
     ID_STEP,
     ID_STOP,
-    ID_ZOOMIN,
-    ID_ZOOMOUT,
     ID_TOPSPEED,
 
     // speed selection slider
-    ID_SLIDER
+    ID_SLIDER,
 };
 
 // --------------------------------------------------------------------------
@@ -69,26 +107,42 @@ enum
 
 // Event tables
 BEGIN_EVENT_TABLE(LifeFrame, wxFrame)
+    EVT_MENU            (ID_NEW,      LifeFrame::OnMenu)
+    EVT_MENU            (ID_OPEN,     LifeFrame::OnOpen)
     EVT_MENU            (ID_SAMPLES,  LifeFrame::OnSamples)
-    EVT_MENU            (ID_RESET,    LifeFrame::OnMenu)
     EVT_MENU            (ID_ABOUT,    LifeFrame::OnMenu)
     EVT_MENU            (ID_EXIT,     LifeFrame::OnMenu)
-    EVT_MENU            (ID_CENTER,   LifeFrame::OnMenu)
+    EVT_MENU            (ID_SHOWNAV,  LifeFrame::OnMenu)
+    EVT_MENU            (ID_ORIGIN,   LifeFrame::OnNavigate)
+    EVT_BUTTON          (ID_CENTER,   LifeFrame::OnNavigate)
+    EVT_BUTTON          (ID_NORTH,    LifeFrame::OnNavigate)
+    EVT_BUTTON          (ID_SOUTH,    LifeFrame::OnNavigate)
+    EVT_BUTTON          (ID_EAST,     LifeFrame::OnNavigate)
+    EVT_BUTTON          (ID_WEST,     LifeFrame::OnNavigate)
+    EVT_MENU            (ID_ZOOMIN,   LifeFrame::OnZoom)
+    EVT_MENU            (ID_ZOOMOUT,  LifeFrame::OnZoom)
+    EVT_MENU            (ID_INFO,     LifeFrame::OnMenu)
     EVT_MENU            (ID_START,    LifeFrame::OnMenu)
     EVT_MENU            (ID_STEP,     LifeFrame::OnMenu)
     EVT_MENU            (ID_STOP,     LifeFrame::OnMenu)
-    EVT_MENU            (ID_ZOOMIN,   LifeFrame::OnMenu)
-    EVT_MENU            (ID_ZOOMOUT,  LifeFrame::OnMenu)
     EVT_MENU            (ID_TOPSPEED, LifeFrame::OnMenu)
     EVT_COMMAND_SCROLL  (ID_SLIDER,   LifeFrame::OnSlider)
+    EVT_TIMER           (ID_TIMER,    LifeFrame::OnTimer)
     EVT_CLOSE           (             LifeFrame::OnClose)
 END_EVENT_TABLE()
 
+BEGIN_EVENT_TABLE(LifeNavigator, wxMiniFrame)
+    EVT_CLOSE           (             LifeNavigator::OnClose)
+END_EVENT_TABLE()
+
 BEGIN_EVENT_TABLE(LifeCanvas, wxWindow)
     EVT_PAINT           (             LifeCanvas::OnPaint)
     EVT_SCROLLWIN       (             LifeCanvas::OnScroll)
     EVT_SIZE            (             LifeCanvas::OnSize)
-    EVT_MOUSE_EVENTS    (             LifeCanvas::OnMouse)
+    EVT_MOTION          (             LifeCanvas::OnMouse)
+    EVT_LEFT_DOWN       (             LifeCanvas::OnMouse)
+    EVT_LEFT_UP         (             LifeCanvas::OnMouse)
+    EVT_LEFT_DCLICK     (             LifeCanvas::OnMouse)
     EVT_ERASE_BACKGROUND(             LifeCanvas::OnEraseBackground)
 END_EVENT_TABLE()
 
@@ -102,10 +156,9 @@ IMPLEMENT_APP(LifeApp)
 // ==========================================================================
 
 // some shortcuts
-#define ADD_TOOL(id, bmp, tooltip, help)     \
+#define ADD_TOOL(id, bmp, tooltip, help) \
     toolBar->AddTool(id, bmp, wxNullBitmap, FALSE, -1, -1, (wxObject *)0, tooltip, help)
 
-#define GET_FRAME() ((LifeFrame *) wxGetApp().GetTopWindow())
 
 // --------------------------------------------------------------------------
 // LifeApp
@@ -121,6 +174,11 @@ bool LifeApp::OnInit()
     frame->Show(TRUE);
     SetTopWindow(frame);
 
+    // just for Motif
+#ifdef __WXMOTIF__
+    frame->UpdateInfoText();
+#endif
+
     // enter the main message loop and run the app
     return TRUE;
 }
@@ -130,56 +188,76 @@ bool LifeApp::OnInit()
 // --------------------------------------------------------------------------
 
 // frame constructor
-LifeFrame::LifeFrame() : wxFrame((wxFrame *)0, -1, _("Life!"), wxPoint(50, 50))
+LifeFrame::LifeFrame() : wxFrame((wxFrame *)0, -1, _("Life!"), wxPoint(200, 200))
 {
     // frame icon
     SetIcon(wxICON(mondrian));
 
     // menu bar
-    wxMenu *menuFile = new wxMenu("", wxMENU_TEAROFF);
-    wxMenu *menuGame = new wxMenu("", wxMENU_TEAROFF);
+    wxMenu *menuFile = new wxMenu(_T(""), wxMENU_TEAROFF);
+    wxMenu *menuView = new wxMenu(_T(""), wxMENU_TEAROFF);
+    wxMenu *menuGame = new wxMenu(_T(""), wxMENU_TEAROFF);
 
-    menuFile->Append(ID_RESET, _("Reset"), _("Start a new game"));
-    menuFile->Append(ID_SAMPLES, _("Sample game..."), _("Select a sample configuration"));
+    menuFile->Append(ID_NEW, _("&New"), _("Start a new game"));
+    menuFile->Append(ID_OPEN, _("&Open..."), _("Open an existing Life pattern"));
+    menuFile->Append(ID_SAMPLES, _("&Sample game..."), _("Select a sample configuration"));
     menuFile->AppendSeparator();
     menuFile->Append(ID_ABOUT, _("&About...\tCtrl-A"), _("Show about dialog"));
     menuFile->AppendSeparator();
     menuFile->Append(ID_EXIT, _("E&xit\tAlt-X"), _("Quit this program"));
 
-    menuGame->Append(ID_CENTER, _("Re&center\tCtrl-C"), _("Go to (0, 0)"));
+    menuView->Append(ID_SHOWNAV, _("Navigation &toolbox"), _("Show or hide toolbox"), TRUE);
+    menuView->Check (ID_SHOWNAV, TRUE);
+    menuView->AppendSeparator();
+    menuView->Append(ID_ORIGIN, _("&Absolute origin"), _("Go to (0, 0)"));
+    menuView->Append(ID_CENTER, _("&Center of mass"), _("Find center of mass"));
+    menuView->Append(ID_NORTH, _("&North"), _("Find northernmost cell"));
+    menuView->Append(ID_SOUTH, _("&South"), _("Find southernmost cell"));
+    menuView->Append(ID_EAST, _("&East"), _("Find easternmost cell"));
+    menuView->Append(ID_WEST, _("&West"), _("Find westernmost cell"));
+    menuView->AppendSeparator();
+    menuView->Append(ID_ZOOMIN, _("Zoom &in\tCtrl-I"), _("Zoom in"));
+    menuView->Append(ID_ZOOMOUT, _("Zoom &out\tCtrl-O"), _("Zoom out"));
+    menuView->Append(ID_INFO, _("&Description...\tCtrl-D"), _("View pattern description"));
+
     menuGame->Append(ID_START, _("&Start\tCtrl-S"), _("Start"));
     menuGame->Append(ID_STEP, _("&Next\tCtrl-N"), _("Single step"));
     menuGame->Append(ID_STOP, _("S&top\tCtrl-T"), _("Stop"));
     menuGame->Enable(ID_STOP, FALSE);
     menuGame->AppendSeparator();
-    menuGame->Append(ID_TOPSPEED, _("Top speed!"), _("Go as fast as possible"));
-    menuGame->AppendSeparator();
-    menuGame->Append(ID_ZOOMIN, _("Zoom &in\tCtrl-I"));
-    menuGame->Append(ID_ZOOMOUT, _("Zoom &out\tCtrl-O"));
+    menuGame->Append(ID_TOPSPEED, _("T&op speed!"), _("Go as fast as possible"));
 
     wxMenuBar *menuBar = new wxMenuBar();
     menuBar->Append(menuFile, _("&File"));
+    menuBar->Append(menuView, _("&View"));
     menuBar->Append(menuGame, _("&Game"));
     SetMenuBar(menuBar);
 
     // tool bar
-    wxBitmap tbBitmaps[5];
+    wxBitmap tbBitmaps[7];
 
     tbBitmaps[0] = wxBITMAP(reset);
-    tbBitmaps[1] = wxBITMAP(play);
-    tbBitmaps[2] = wxBITMAP(stop);
-    tbBitmaps[3] = wxBITMAP(zoomin);
-    tbBitmaps[4] = wxBITMAP(zoomout);
+    tbBitmaps[1] = wxBITMAP(open);
+    tbBitmaps[2] = wxBITMAP(zoomin);
+    tbBitmaps[3] = wxBITMAP(zoomout);
+    tbBitmaps[4] = wxBITMAP(info);
+    tbBitmaps[5] = wxBITMAP(play);
+    tbBitmaps[6] = wxBITMAP(stop);
 
     wxToolBar *toolBar = CreateToolBar();
     toolBar->SetMargins(5, 5);
     toolBar->SetToolBitmapSize(wxSize(16, 16));
-    ADD_TOOL(ID_RESET,   tbBitmaps[0], _("Reset"), _("Start a new game"));
-    ADD_TOOL(ID_START,   tbBitmaps[1], _("Start"), _("Start"));
-    ADD_TOOL(ID_STOP,    tbBitmaps[2], _("Stop"),  _("Stop"));
+
+    ADD_TOOL(ID_NEW, tbBitmaps[0], _("New"), _("Start a new game"));
+    ADD_TOOL(ID_OPEN, tbBitmaps[1], _("Open"), _("Open an existing Life pattern"));
+    toolBar->AddSeparator();
+    ADD_TOOL(ID_ZOOMIN, tbBitmaps[2], _("Zoom in"), _("Zoom in"));
+    ADD_TOOL(ID_ZOOMOUT, tbBitmaps[3], _("Zoom out"), _("Zoom out"));
+    ADD_TOOL(ID_INFO, tbBitmaps[4], _("Description"), _("Show description"));
     toolBar->AddSeparator();
-    ADD_TOOL(ID_ZOOMIN,  tbBitmaps[3], _("Zoom in"),  _("Zoom in"));
-    ADD_TOOL(ID_ZOOMOUT, tbBitmaps[4], _("Zoom out"),  _("Zoom out"));
+    ADD_TOOL(ID_START, tbBitmaps[5], _("Start"), _("Start"));
+    ADD_TOOL(ID_STOP, tbBitmaps[6], _("Stop"), _("Stop"));
+
     toolBar->Realize();
     toolBar->EnableTool(ID_STOP, FALSE);    // must be after Realize() !
 
@@ -187,36 +265,70 @@ LifeFrame::LifeFrame() : wxFrame((wxFrame *)0, -1, _("Life!"), wxPoint(50, 50))
     CreateStatusBar(2);
     SetStatusText(_("Welcome to Life!"));
 
-    // game and canvas
-    wxPanel *panel = new wxPanel(this, -1);
-    m_life         = new Life();
-    m_canvas       = new LifeCanvas(panel, m_life);
-    m_timer        = new LifeTimer();
-    m_running      = FALSE;
-    m_topspeed     = FALSE;
-    m_interval     = 500;
-    m_tics         = 0;
-    m_text         = new wxStaticText(panel, -1, "");
-    UpdateInfoText();
+    // game and timer
+    m_life     = new Life();
+    m_timer    = new wxTimer(this, ID_TIMER);
+    m_running  = FALSE;
+    m_topspeed = FALSE;
+    m_interval = 500;
+    m_tics     = 0;
 
-    // speed selection slider
-    wxSlider *slider = new wxSlider(panel, ID_SLIDER,
+    // We use two different panels to reduce flicker in wxGTK, because
+    // some widgets (like wxStaticText) don't have their own X11 window,
+    // and thus updating the text would result in a refresh of the canvas
+    // if they belong to the same parent.
+
+    wxPanel *panel1 = new wxPanel(this, -1);
+    wxPanel *panel2 = new wxPanel(this, -1);
+
+    // canvas
+    m_canvas = new LifeCanvas(panel1, m_life);
+
+    // info panel
+    m_text = new wxStaticText(panel2, -1,
+        wxEmptyString,
+        wxDefaultPosition,
+        wxDefaultSize,
+        wxALIGN_CENTER | wxST_NO_AUTORESIZE);
+
+    wxSlider *slider = new wxSlider(panel2, ID_SLIDER,
         5, 1, 10,
         wxDefaultPosition,
         wxSize(200, -1),
         wxSL_HORIZONTAL | wxSL_AUTOTICKS);
 
+    UpdateInfoText();
+
     // component layout
-    wxBoxSizer *sizer = new wxBoxSizer(wxVERTICAL);
-    sizer->Add(new wxStaticLine(panel, -1), 0, wxGROW | wxCENTRE);
-    sizer->Add(m_canvas, 1, wxGROW | wxCENTRE | wxALL, 5);
-    sizer->Add(new wxStaticLine(panel, -1), 0, wxGROW | wxCENTRE);
-    sizer->Add(m_text, 0, wxCENTRE | wxTOP, 5);
-    sizer->Add(slider, 0, wxCENTRE | wxALL, 5);
-    panel->SetSizer(sizer);
-    panel->SetAutoLayout(TRUE);
-    sizer->Fit(this);
-    sizer->SetSizeHints(this);
+    wxBoxSizer *sizer1 = new wxBoxSizer(wxVERTICAL);
+    wxBoxSizer *sizer2 = new wxBoxSizer(wxVERTICAL);
+    wxBoxSizer *sizer3 = new wxBoxSizer(wxVERTICAL);
+
+    sizer1->Add( new wxStaticLine(panel1, -1), 0, wxGROW );
+    sizer1->Add( m_canvas, 1, wxGROW | wxALL, 2 );
+    sizer1->Add( new wxStaticLine(panel1, -1), 0, wxGROW );
+    panel1->SetSizer( sizer1 );
+    panel1->SetAutoLayout( TRUE );
+    sizer1->Fit( panel1 );
+
+    sizer2->Add( m_text, 0, wxGROW | wxTOP, 4 );
+    sizer2->Add( slider, 0, wxCENTRE | wxALL, 4 );
+
+    panel2->SetSizer( sizer2 );
+    panel2->SetAutoLayout( TRUE );
+    sizer2->Fit( panel2 );
+
+    sizer3->Add( panel1, 1, wxGROW );
+    sizer3->Add( panel2, 0, wxGROW );
+    SetSizer( sizer3 );
+    SetAutoLayout( TRUE );
+    sizer3->Fit( this );
+
+    // set minimum frame size
+    sizer3->SetSizeHints( this );
+
+    // navigator frame
+    m_navigator = new LifeNavigator(this);
 }
 
 LifeFrame::~LifeFrame()
@@ -228,7 +340,7 @@ void LifeFrame::UpdateInfoText()
 {
     wxString msg;
 
-    msg.Printf(_("  Generation: %u (T: %u ms),  Population: %u  "),
+    msg.Printf(_(" Generation: %u (T: %u ms),  Population: %u "),
                m_tics,
                m_topspeed? 0 : m_interval,
                m_life->GetNumCells());
@@ -240,36 +352,71 @@ void LifeFrame::UpdateInfoText()
 // way to do this.
 void LifeFrame::UpdateUI()
 {
+    // start / stop
     GetToolBar()->EnableTool(ID_START, !m_running);
     GetToolBar()->EnableTool(ID_STOP,  m_running);
-    GetMenuBar()->GetMenu(1)->Enable(ID_START, !m_running);
-    GetMenuBar()->GetMenu(1)->Enable(ID_STEP,  !m_running);
-    GetMenuBar()->GetMenu(1)->Enable(ID_STOP,  m_running);
+    GetMenuBar()->GetMenu(2)->Enable(ID_START, !m_running);
+    GetMenuBar()->GetMenu(2)->Enable(ID_STEP,  !m_running);
+    GetMenuBar()->GetMenu(2)->Enable(ID_STOP,  m_running);
+
+    // zooming
+    int cellsize = m_canvas->GetCellSize();
+    GetToolBar()->EnableTool(ID_ZOOMIN,  cellsize < 32);
+    GetToolBar()->EnableTool(ID_ZOOMOUT, cellsize > 1);
+    GetMenuBar()->GetMenu(1)->Enable(ID_ZOOMIN,  cellsize < 32);
+    GetMenuBar()->GetMenu(1)->Enable(ID_ZOOMOUT, cellsize > 1);
 }
 
-// event handlers
+// Event handlers -----------------------------------------------------------
+
+// OnMenu handles all events which don't have their own event handler
 void LifeFrame::OnMenu(wxCommandEvent& event)
 {
     switch (event.GetId())
     {
-        case ID_CENTER  : m_canvas->Recenter(0, 0); break;
-        case ID_START   : OnStart(); break;
-        case ID_STEP    : OnTimer(); break;
-        case ID_STOP    : OnStop(); break;
-        case ID_ZOOMIN  :
+        case ID_NEW:
+        {
+            // stop if it was running
+            OnStop();
+            m_life->Clear();
+            m_canvas->Recenter(0, 0);
+            m_tics = 0;
+            UpdateInfoText();
+            break;
+        }
+        case ID_ABOUT:
+        {
+            LifeAboutDialog dialog(this);
+            dialog.ShowModal();
+            break;
+        }
+        case ID_EXIT:
         {
-            int cellsize = m_canvas->GetCellSize();
-            if (cellsize < 32)
-                m_canvas->SetCellSize(cellsize * 2);
+            // TRUE is to force the frame to close
+            Close(TRUE);
             break;
         }
-        case ID_ZOOMOUT :
+        case ID_SHOWNAV :
         {
-            int cellsize = m_canvas->GetCellSize();
-            if (cellsize > 1)
-                m_canvas->SetCellSize(cellsize / 2);
+            bool checked = GetMenuBar()->GetMenu(1)->IsChecked(ID_SHOWNAV);
+            m_navigator->Show(checked);
             break;
         }
+        case ID_INFO:
+        {
+            wxString desc = m_life->GetDescription();
+            
+            if ( desc.IsEmpty() )
+                desc = _("Not available");
+
+            // should we make the description editable here?
+            wxMessageBox(desc, _("Description"), wxOK | wxICON_INFORMATION);
+
+            break;
+        }
+        case ID_START   : OnStart(); break;
+        case ID_STEP    : OnStep(); break;
+        case ID_STOP    : OnStop(); break;
         case ID_TOPSPEED:
         {
             m_running = TRUE;
@@ -277,46 +424,44 @@ void LifeFrame::OnMenu(wxCommandEvent& event)
             UpdateUI();
             while (m_running && m_topspeed)           
             {
-                OnTimer();
+                OnStep();
                 wxYield();
             }
             break;
         }
-        case ID_RESET:
+    }
+}
+
+void LifeFrame::OnOpen(wxCommandEvent& WXUNUSED(event))
+{
+    wxFileDialog filedlg(this,
+                         _("Choose a file to open"),
+                         _(""),
+                         _(""),
+                         _("Life patterns (*.lif)|*.lif|All files (*.*)|*.*"),
+                         wxOPEN | wxFILE_MUST_EXIST);
+
+    if (filedlg.ShowModal() == wxID_OK)
+    {
+        wxFileInputStream stream(filedlg.GetPath());
+        LifeReader reader(stream);
+
+        // the reader handles errors itself, no need to do anything here
+        if (reader.IsOk())
         {
-            // stop if it was running
+            // stop if running and put the pattern
             OnStop();
             m_life->Clear();
+            m_life->SetPattern(reader.GetPattern());
+
+            // recenter canvas
             m_canvas->Recenter(0, 0);
             m_tics = 0;
             UpdateInfoText();
-            break;
-        }
-        case ID_ABOUT:
-        {
-            LifeAboutDialog dialog(this);
-            dialog.ShowModal();
-            break;
-        }
-        case ID_EXIT :
-        {
-            // TRUE is to force the frame to close
-            Close(TRUE);
-            break;
         }
     }
 }
 
-void LifeFrame::OnClose(wxCloseEvent& WXUNUSED(event))
-{
-    // Stop if it was running; this is absolutely needed because
-    // the frame won't be actually destroyed until there are no
-    // more pending events, and this in turn won't ever happen
-    // if the timer is running faster than the window can redraw.
-    OnStop();
-    Destroy();   
-}
-
 void LifeFrame::OnSamples(wxCommandEvent& WXUNUSED(event))
 {
     // stop if it was running
@@ -325,14 +470,13 @@ void LifeFrame::OnSamples(wxCommandEvent& WXUNUSED(event))
     // dialog box
     LifeSamplesDialog dialog(this);
 
-    // new game?
     if (dialog.ShowModal() == wxID_OK)
     {
-        const LifeShape shape = dialog.GetShape();
+        const LifePattern pattern = dialog.GetPattern();
 
-        // put the shape
+        // put the pattern
         m_life->Clear();
-        m_life->SetShape(shape);
+        m_life->SetPattern(pattern);
 
         // recenter canvas
         m_canvas->Recenter(0, 0);
@@ -341,6 +485,67 @@ void LifeFrame::OnSamples(wxCommandEvent& WXUNUSED(event))
     }
 }
 
+void LifeFrame::OnZoom(wxCommandEvent& event)
+{
+    int cellsize = m_canvas->GetCellSize();
+
+    if ((event.GetId() == ID_ZOOMIN) && cellsize < 32)
+    {
+        m_canvas->SetCellSize(cellsize * 2);
+        UpdateUI();
+    }
+    else if ((event.GetId() == ID_ZOOMOUT) && cellsize > 1)
+    {
+        m_canvas->SetCellSize(cellsize / 2);
+        UpdateUI();
+    }
+}
+
+void LifeFrame::OnNavigate(wxCommandEvent& event)
+{
+    LifeCell c;
+
+    switch (event.GetId())
+    {
+               case ID_NORTH:  c = m_life->FindNorth(); break;
+        case ID_SOUTH:  c = m_life->FindSouth(); break;
+        case ID_WEST:   c = m_life->FindWest(); break;
+        case ID_EAST:   c = m_life->FindEast(); break;
+        case ID_CENTER: c = m_life->FindCenter(); break;
+        case ID_ORIGIN: c.i = c.j = 0; break;
+    }
+
+    m_canvas->Recenter(c.i, c.j);
+}
+
+void LifeFrame::OnSlider(wxScrollEvent& event)
+{
+    m_interval = event.GetPosition() * 100;
+
+    if (m_running)
+    {
+        OnStop();
+        OnStart();
+    }
+    
+    UpdateInfoText();
+}
+
+void LifeFrame::OnTimer(wxTimerEvent& WXUNUSED(event))
+{
+    OnStep();
+}
+
+void LifeFrame::OnClose(wxCloseEvent& WXUNUSED(event))
+{
+    // Stop if it was running; this is absolutely needed because
+    // the frame won't be actually destroyed until there are no
+    // more pending events, and this in turn won't ever happen
+    // if the timer is running faster than the window can redraw.
+    OnStop();
+    Destroy();   
+}
+
 void LifeFrame::OnStart()
 {
     if (!m_running)
@@ -362,7 +567,7 @@ void LifeFrame::OnStop()
     }
 }
 
-void LifeFrame::OnTimer()
+void LifeFrame::OnStep()
 {
     if (m_life->NextTic())
         m_tics++;
@@ -373,27 +578,93 @@ void LifeFrame::OnTimer()
     UpdateInfoText();
 }
 
-void LifeFrame::OnSlider(wxScrollEvent& event)
-{
-    m_interval = event.GetPosition() * 100;
-
-    if (m_running)
-    {
-        OnStop();
-        OnStart();
-    }
-    
-    UpdateInfoText();
-}
 
 // --------------------------------------------------------------------------
-// LifeTimer
+// LifeNavigator miniframe
 // --------------------------------------------------------------------------
 
-void LifeTimer::Notify()
+LifeNavigator::LifeNavigator(wxWindow *parent)
+             : wxMiniFrame(parent, -1,
+                           _("Navigation"),
+                           wxDefaultPosition,
+                           wxDefaultSize,
+                           wxCAPTION | wxSIMPLE_BORDER)
 {
-    GET_FRAME()->OnTimer();
-};
+    wxPanel    *panel  = new wxPanel(this, -1);
+    wxBoxSizer *sizer1 = new wxBoxSizer(wxVERTICAL);
+    wxBoxSizer *sizer2 = new wxBoxSizer(wxHORIZONTAL);
+
+    // create bitmaps and masks for the buttons
+    wxBitmap
+        bmpn = wxBITMAP(north),
+        bmpw = wxBITMAP(west),  
+        bmpc = wxBITMAP(center),
+        bmpe = wxBITMAP(east),  
+        bmps = wxBITMAP(south);
+
+#if !defined(__WXGTK__) && !defined(__WXMOTIF__) && !defined(__WXMAC__)
+    bmpn.SetMask(new wxMask(bmpn, *wxLIGHT_GREY));
+    bmpw.SetMask(new wxMask(bmpw, *wxLIGHT_GREY));
+    bmpc.SetMask(new wxMask(bmpc, *wxLIGHT_GREY));
+    bmpe.SetMask(new wxMask(bmpe, *wxLIGHT_GREY)); 
+    bmps.SetMask(new wxMask(bmps, *wxLIGHT_GREY));
+#endif
+
+    // create the buttons and attach tooltips to them
+    wxBitmapButton
+        *bn = new wxBitmapButton(panel, ID_NORTH,  bmpn),
+        *bw = new wxBitmapButton(panel, ID_WEST ,  bmpw),
+        *bc = new wxBitmapButton(panel, ID_CENTER, bmpc),
+        *be = new wxBitmapButton(panel, ID_EAST ,  bmpe),
+        *bs = new wxBitmapButton(panel, ID_SOUTH,  bmps);
+
+#if wxUSE_TOOLTIPS
+    bn->SetToolTip(_("Find northernmost cell"));
+    bw->SetToolTip(_("Find westernmost cell"));
+    bc->SetToolTip(_("Find center of mass"));
+    be->SetToolTip(_("Find easternmost cell"));
+    bs->SetToolTip(_("Find southernmost cell"));
+#endif
+
+    // add buttons to sizers
+    sizer2->Add( bw, 0, wxCENTRE | wxWEST,  4 );
+    sizer2->Add( bc, 0, wxCENTRE);
+    sizer2->Add( be, 0, wxCENTRE | wxEAST,  4 );
+    sizer1->Add( bn, 0, wxCENTRE | wxNORTH, 4 );
+    sizer1->Add( sizer2 );
+    sizer1->Add( bs, 0, wxCENTRE | wxSOUTH, 4 );
+
+    // set the panel and miniframe size
+    panel->SetSizer(sizer1);
+    panel->SetAutoLayout(TRUE);
+
+    sizer1->Fit(panel);
+    SetClientSize(panel->GetSize());
+    wxSize sz = GetSize();
+    SetSizeHints(sz.x, sz.y, sz.x, sz.y);
+
+    // move it to a sensible position
+    wxRect parentRect = parent->GetRect();
+    wxSize childSize  = GetSize();
+    int x = parentRect.GetX() +
+            parentRect.GetWidth();
+    int y = parentRect.GetY() +
+            (parentRect.GetHeight() - childSize.GetHeight()) / 4;
+    Move(x, y);
+
+    // done
+    Show(TRUE);
+}
+
+void LifeNavigator::OnClose(wxCloseEvent& event)
+{
+    // avoid if we can
+    if (event.CanVeto())
+        event.Veto();
+    else
+        Destroy();
+}
+
 
 // --------------------------------------------------------------------------
 // LifeCanvas
@@ -445,7 +716,7 @@ void LifeCanvas::SetCellSize(int cellsize)
     wxInt32 cy = m_viewportY + m_viewportH / 2;
 
     // get current canvas size and adjust viewport accordingly
-    wxCoord w, h;
+    int w, h;
     GetClientSize(&w, &h);
     m_viewportW = (w + m_cellsize - 1) / m_cellsize;
     m_viewportH = (h + m_cellsize - 1) / m_cellsize;
@@ -504,7 +775,7 @@ void LifeCanvas::DrawChanged()
     wxClientDC dc(this);
 
     size_t ncells;
-    Cell *cells;
+    LifeCell *cells;
     bool done = FALSE;
 
     m_life->BeginFind(m_viewportX,
@@ -514,19 +785,17 @@ void LifeCanvas::DrawChanged()
                       TRUE);
    
     dc.BeginDrawing();
-    dc.SetLogicalFunction(wxINVERT);
 
     if (m_cellsize == 1)
     {
-        // drawn using DrawPoint
         dc.SetPen(*wxBLACK_PEN);
     }
     else
     {
-        // drawn using DrawRectangle
         dc.SetPen(*wxTRANSPARENT_PEN);
         dc.SetBrush(*wxBLACK_BRUSH);
     }
+    dc.SetLogicalFunction(wxINVERT);
 
     while (!done)
     {
@@ -558,7 +827,7 @@ void LifeCanvas::OnPaint(wxPaintEvent& event)
     j1 = YToCell(y + h - 1);
 
     size_t ncells;
-    Cell *cells;
+    LifeCell *cells;
     bool done = FALSE;
 
     m_life->BeginFind(i0, j0, i1, j1, FALSE);
@@ -619,30 +888,103 @@ void LifeCanvas::OnMouse(wxMouseEvent& event)
     // set statusbar text
     wxString msg;
     msg.Printf(_("Cell: (%d, %d)"), i, j);
-    GET_FRAME()->SetStatusText(msg, 1);
+    ((LifeFrame *) wxGetApp().GetTopWindow())->SetStatusText(msg, 1);
+
+    // NOTE that wxMouseEvent::LeftDown() and wxMouseEvent::LeftIsDown()
+    // have different semantics. The first one is used to signal that the
+    // button was just pressed (i.e., in "button down" events); the second
+    // one just describes the current status of the button, independently
+    // of the mouse event type. LeftIsDown is typically used in "mouse
+    // move" events, to test if the button is _still_ pressed.
 
-    // button pressed?
+    // is the button down?
     if (!event.LeftIsDown())
     {
         m_status = MOUSE_NOACTION;
+        return;
     }
-    else
-    {
-        bool alive = m_life->IsAlive(i, j);
 
-        // if just pressed, update status
-        if (m_status == MOUSE_NOACTION)
-            m_status = (alive? MOUSE_ERASING : MOUSE_DRAWING);
-
-        // toggle cell and refresh if needed
-        if (((m_status == MOUSE_ERASING) && alive) ||
-            ((m_status == MOUSE_DRAWING) && !alive))
+    // was it pressed just now?
+    if (event.LeftDown())
+    {
+        // yes: start a new action and toggle this cell
+        m_status = (m_life->IsAlive(i, j)? MOUSE_ERASING : MOUSE_DRAWING);
+            
+        m_mi = i;
+        m_mj = j;
+        m_life->SetCell(i, j, m_status == MOUSE_DRAWING);
+        DrawCell(i, j, m_status == MOUSE_DRAWING);
+    }
+    else if ((m_mi != i) || (m_mj != j))
+    {
+        // no: continue ongoing action
+        bool alive = (m_status == MOUSE_DRAWING);
+
+        // prepare DC and pen + brush to optimize drawing
+        wxClientDC dc(this);
+        dc.SetPen(alive? *wxBLACK_PEN : *wxWHITE_PEN);
+        dc.SetBrush(alive? *wxBLACK_BRUSH : *wxWHITE_BRUSH);
+        dc.BeginDrawing();
+
+        // draw a line of cells using Bresenham's algorithm
+        wxInt32 d, ii, jj, di, ai, si, dj, aj, sj;
+        di = i - m_mi;
+        ai = abs(di) << 1;
+        si = (di < 0)? -1 : 1;
+        dj = j - m_mj;
+        aj = abs(dj) << 1;
+        sj = (dj < 0)? -1 : 1;
+
+        ii = m_mi;
+        jj = m_mj;
+  
+        if (ai > aj)
+        {
+            // iterate over i
+            d = aj - (ai >> 1);        
+               
+            while (ii != i)
+            {
+                m_life->SetCell(ii, jj, alive);
+                DrawCell(ii, jj, dc);
+                if (d >= 0)
+                {
+                    jj += sj;
+                    d  -= ai;   
+                }
+                ii += si;
+                d  += aj;
+            }
+        }
+        else
         {
-            m_life->SetCell(i, j, !alive);
-            DrawCell(i, j, !alive);
-            GET_FRAME()->UpdateInfoText();
+            // iterate over j
+            d = ai - (aj >> 1);
+
+            while (jj != j)
+            {
+                m_life->SetCell(ii, jj, alive);
+                DrawCell(ii, jj, dc);
+                if (d >= 0)
+                {
+                    ii += si;
+                    d  -= aj;   
+                }
+                jj += sj;
+                d  += ai;
+            }
         }
+
+        // last cell
+        m_life->SetCell(ii, jj, alive);
+        DrawCell(ii, jj, dc);
+        m_mi = ii;
+        m_mj = jj;
+
+        dc.EndDrawing();
     }
+
+    ((LifeFrame *) wxGetApp().GetTopWindow())->UpdateInfoText();
 }
 
 void LifeCanvas::OnSize(wxSizeEvent& event)
@@ -679,61 +1021,69 @@ void LifeCanvas::OnScroll(wxScrollWinEvent& event)
     WXTYPE type = event.GetEventType();
     int pos     = event.GetPosition();
     int orient  = event.GetOrientation();
-    bool scrolling = event.IsScrolling();
-    int  scrollinc = 0;
 
     // calculate scroll increment
-    switch (type)
+    int scrollinc = 0;
+    if (type == wxEVT_SCROLLWIN_TOP)
     {
-        case wxEVT_SCROLLWIN_TOP:
-        {
-            if (orient == wxHORIZONTAL)
-                scrollinc = -m_viewportW;
-            else
-                scrollinc = -m_viewportH;
-            break;    
-        }
-        case wxEVT_SCROLLWIN_BOTTOM:
+        if (orient == wxHORIZONTAL)
+            scrollinc = -m_viewportW;
+        else
+            scrollinc = -m_viewportH;
+    }
+    else
+    if (type == wxEVT_SCROLLWIN_BOTTOM)
+    {
+        if (orient == wxHORIZONTAL)
+            scrollinc = m_viewportW;
+        else
+            scrollinc = m_viewportH;
+    }
+    else
+    if (type == wxEVT_SCROLLWIN_LINEUP)
+    {
+        scrollinc = -1;
+    }
+    else
+    if (type == wxEVT_SCROLLWIN_LINEDOWN)
+    {
+        scrollinc = +1;
+    }
+    else
+    if (type == wxEVT_SCROLLWIN_PAGEUP)
+    {
+        scrollinc = -10;
+    }
+    else
+    if (type == wxEVT_SCROLLWIN_PAGEDOWN)
+    {
+        scrollinc = +10;
+    }
+    else
+    if (type == wxEVT_SCROLLWIN_THUMBTRACK)
+    {
+        if (orient == wxHORIZONTAL)
         {
-            if (orient == wxHORIZONTAL)
-                scrollinc = m_viewportW;
-            else
-                scrollinc = m_viewportH;
-            break;    
+            scrollinc = pos - m_thumbX;
+            m_thumbX = pos;
         }
-        case wxEVT_SCROLLWIN_LINEUP:   scrollinc = -1; break;
-        case wxEVT_SCROLLWIN_LINEDOWN: scrollinc = +1; break;
-        case wxEVT_SCROLLWIN_PAGEUP:   scrollinc = -10; break;
-        case wxEVT_SCROLLWIN_PAGEDOWN: scrollinc = +10; break;
-        case wxEVT_SCROLLWIN_THUMBTRACK:
+        else
         {
-            if (scrolling)
-            {
-                // user is dragging the thumb in the scrollbar
-                if (orient == wxHORIZONTAL)
-                {
-                    scrollinc = pos - m_thumbX;
-                    m_thumbX = pos;
-                }
-                else
-                {
-                    scrollinc = pos - m_thumbY;
-                    m_thumbY = pos;
-                }
-            }
-            else
-            {
-                // user released the thumb after dragging
-                m_thumbX = m_viewportW;
-                m_thumbY = m_viewportH;
-            }
-            break;
+            scrollinc = pos - m_thumbY;
+            m_thumbY = pos;
         }
     }
+    else
+    if (type == wxEVT_SCROLLWIN_THUMBRELEASE)
+    {
+        m_thumbX = m_viewportW;
+        m_thumbY = m_viewportH;
+    }
 
-#ifdef __WXGTK__ // what about Motif?
-    // wxGTK updates the thumb automatically (wxMSW doesn't); reset it back
-    if ((type != wxEVT_SCROLLWIN_THUMBTRACK) || !scrolling)
+#if defined(__WXGTK__) || defined(__WXMOTIF__)
+    // wxGTK and wxMotif update the thumb automatically (wxMSW doesn't);
+    // so reset it back as we always want it to be in the same position.
+    if (type != wxEVT_SCROLLWIN_THUMBTRACK)
     {
         SetScrollbar(wxHORIZONTAL, m_viewportW, m_viewportW, 3 * m_viewportW);
         SetScrollbar(wxVERTICAL,   m_viewportH, m_viewportH, 3 * m_viewportH);
@@ -759,3 +1109,5 @@ void LifeCanvas::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
 {
     // do nothing. I just don't want the background to be erased, you know.
 }
+
+