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wxWidgets/demos/life/life.cpp
Vadim Zeitlin 18f42b94df Remove calls to wxApp::SetTopWindow() from the samples and documentation. 
It is definitely not necessary to call SetTopWindow() when there is only a
single top level window and it is arguable whether it's useful to do it even
when there are many of them so don't encourage its use in the documentation
and also remove all its occurrences from the samples.

Closes #12816.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66528 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2011-01-02 22:05:14 +00:00

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31 KiB
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/////////////////////////////////////////////////////////////////////////////
// Name: life.cpp
// Purpose: The game of Life, created by J. H. Conway
// Author: Guillermo Rodriguez Garcia, <guille@iies.es>
// Modified by:
// Created: Jan/2000
// RCS-ID: $Id$
// Copyright: (c) 2000, Guillermo Rodriguez Garcia
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// ==========================================================================
// headers, declarations, constants
// ==========================================================================
// 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 "wx/stockitem.h"
#include "life.h"
#include "game.h"
#include "dialogs.h"
#include "reader.h"
// --------------------------------------------------------------------------
// resources
// --------------------------------------------------------------------------
#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
// --------------------------------------------------------------------------
// constants
// --------------------------------------------------------------------------
// IDs for the controls and the menu commands. Exluding those already defined
// by wxWidgets, such as wxID_NEW.
enum
{
// timer
ID_TIMER = wxID_HIGHEST,
// file menu
ID_SAMPLES,
// view menu
ID_SHOWNAV,
ID_ORIGIN,
ID_CENTER,
ID_NORTH,
ID_SOUTH,
ID_EAST,
ID_WEST,
ID_INFO,
// game menu
ID_START,
ID_STEP,
ID_TOPSPEED,
// speed selection slider
ID_SLIDER
};
// --------------------------------------------------------------------------
// event tables and other macros for wxWidgets
// --------------------------------------------------------------------------
// Event tables
BEGIN_EVENT_TABLE(LifeFrame, wxFrame)
EVT_MENU (wxID_NEW, LifeFrame::OnMenu)
#if wxUSE_FILEDLG
EVT_MENU (wxID_OPEN, LifeFrame::OnOpen)
#endif
EVT_MENU (ID_SAMPLES, LifeFrame::OnSamples)
EVT_MENU (wxID_ABOUT, LifeFrame::OnMenu)
EVT_MENU (wxID_EXIT, 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 (wxID_ZOOM_IN, LifeFrame::OnZoom)
EVT_MENU (wxID_ZOOM_OUT,LifeFrame::OnZoom)
EVT_MENU (ID_INFO, LifeFrame::OnMenu)
EVT_MENU (ID_START, LifeFrame::OnMenu)
EVT_MENU (ID_STEP, LifeFrame::OnMenu)
EVT_MENU (wxID_STOP, 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_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()
// Create a new application object
IMPLEMENT_APP(LifeApp)
// ==========================================================================
// implementation
// ==========================================================================
// some shortcuts
#define ADD_TOOL(id, bmp, tooltip, help) \
toolBar->AddTool(id, wxEmptyString, bmp, wxNullBitmap, wxITEM_NORMAL, tooltip, help)
// --------------------------------------------------------------------------
// LifeApp
// --------------------------------------------------------------------------
// 'Main program' equivalent: the program execution "starts" here
bool LifeApp::OnInit()
{
// create the main application window
LifeFrame *frame = new LifeFrame();
// show it
frame->Show(true);
// just for Motif
#ifdef __WXMOTIF__
frame->UpdateInfoText();
#endif
// enter the main message loop and run the app
return true;
}
// --------------------------------------------------------------------------
// LifeFrame
// --------------------------------------------------------------------------
// frame constructor
LifeFrame::LifeFrame() :
wxFrame( (wxFrame *) NULL, wxID_ANY, _("Life!"), wxDefaultPosition ),
m_navigator(NULL)
{
// frame icon
SetIcon(wxICON(mondrian));
// menu bar
wxMenu *menuFile = new wxMenu(wxMENU_TEAROFF);
wxMenu *menuView = new wxMenu(wxMENU_TEAROFF);
wxMenu *menuGame = new wxMenu(wxMENU_TEAROFF);
wxMenu *menuHelp = new wxMenu(wxMENU_TEAROFF);
menuFile->Append(wxID_NEW, wxEmptyString, _("Start a new game"));
#if wxUSE_FILEDLG
menuFile->Append(wxID_OPEN, wxEmptyString, _("Open an existing Life pattern"));
#endif
menuFile->Append(ID_SAMPLES, _("&Sample game..."), _("Select a sample configuration"));
#if ! (defined(__SMARTPHONE__) || defined(__POCKETPC__))
menuFile->AppendSeparator();
menuFile->Append(wxID_EXIT);
menuView->Append(ID_SHOWNAV, _("Navigation &toolbox"), _("Show or hide toolbox"), wxITEM_CHECK);
menuView->Check(ID_SHOWNAV, true);
menuView->AppendSeparator();
#endif
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(wxID_ZOOM_IN, wxEmptyString, _("Zoom in"));
menuView->Append(wxID_ZOOM_OUT, wxEmptyString, _("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(wxID_STOP, wxEmptyString, _("Stop"));
menuGame->Enable(wxID_STOP, false);
menuGame->AppendSeparator();
menuGame->Append(ID_TOPSPEED, _("T&op speed!"), _("Go as fast as possible"));
menuHelp->Append(wxID_ABOUT, _("&About\tCtrl-A"), _("Show about dialog"));
wxMenuBar *menuBar = new wxMenuBar();
menuBar->Append(menuFile, _("&File"));
menuBar->Append(menuView, _("&View"));
menuBar->Append(menuGame, _("&Game"));
menuBar->Append(menuHelp, _("&Help"));
SetMenuBar(menuBar);
// tool bar
wxBitmap tbBitmaps[7];
tbBitmaps[0] = wxBITMAP(reset);
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(wxID_NEW, tbBitmaps[0], wxGetStockLabel(wxID_NEW, wxSTOCK_NOFLAGS), _("Start a new game"));
#ifndef __POCKETPC__
#if wxUSE_FILEDLG
ADD_TOOL(wxID_OPEN, tbBitmaps[1], wxGetStockLabel(wxID_OPEN, wxSTOCK_NOFLAGS), _("Open an existing Life pattern"));
#endif // wxUSE_FILEDLG
toolBar->AddSeparator();
ADD_TOOL(wxID_ZOOM_IN, tbBitmaps[2], wxGetStockLabel(wxID_ZOOM_IN, wxSTOCK_NOFLAGS), _("Zoom in"));
ADD_TOOL(wxID_ZOOM_OUT, tbBitmaps[3], wxGetStockLabel(wxID_ZOOM_OUT, wxSTOCK_NOFLAGS), _("Zoom out"));
ADD_TOOL(ID_INFO, tbBitmaps[4], _("Description"), _("Show description"));
toolBar->AddSeparator();
#endif // __POCKETPC__
ADD_TOOL(ID_START, tbBitmaps[5], _("Start"), _("Start"));
ADD_TOOL(wxID_STOP, tbBitmaps[6], _("Stop"), _("Stop"));
toolBar->Realize();
toolBar->EnableTool(wxID_STOP, false); // must be after Realize() !
#if wxUSE_STATUSBAR
// status bar
CreateStatusBar(2);
SetStatusText(_("Welcome to Life!"));
#endif // wxUSE_STATUSBAR
// 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;
// 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, wxID_ANY);
wxPanel *panel2 = new wxPanel(this, wxID_ANY);
// canvas
m_canvas = new LifeCanvas(panel1, m_life);
// info panel
m_text = new wxStaticText(panel2, wxID_ANY,
wxEmptyString,
wxDefaultPosition,
wxDefaultSize,
wxALIGN_CENTER | wxST_NO_AUTORESIZE);
wxSlider *slider = new wxSlider(panel2, ID_SLIDER,
5, 1, 10,
wxDefaultPosition,
wxSize(200, wxDefaultCoord),
wxSL_HORIZONTAL | wxSL_AUTOTICKS);
UpdateInfoText();
// component layout
wxBoxSizer *sizer1 = new wxBoxSizer(wxVERTICAL);
wxBoxSizer *sizer2 = new wxBoxSizer(wxVERTICAL);
wxBoxSizer *sizer3 = new wxBoxSizer(wxVERTICAL);
#if wxUSE_STATLINE
sizer1->Add( new wxStaticLine(panel1, wxID_ANY), 0, wxGROW );
#endif // wxUSE_STATLINE
sizer1->Add( m_canvas, 1, wxGROW | wxALL, 2 );
#if wxUSE_STATLINE
sizer1->Add( new wxStaticLine(panel1, wxID_ANY), 0, wxGROW );
#endif // wxUSE_STATLINE
panel1->SetSizer( sizer1 );
sizer1->Fit( panel1 );
sizer2->Add( m_text, 0, wxGROW | wxTOP, 4 );
sizer2->Add( slider, 0, wxCENTRE | wxALL, 4 );
panel2->SetSizer( sizer2 );
sizer2->Fit( panel2 );
sizer3->Add( panel1, 1, wxGROW );
sizer3->Add( panel2, 0, wxGROW );
SetSizer( sizer3 );
#ifndef __WXWINCE__
sizer3->Fit( this );
// set minimum frame size
sizer3->SetSizeHints( this );
// navigator frame - not appropriate for small devices
m_navigator = new LifeNavigator(this);
#endif
}
LifeFrame::~LifeFrame()
{
delete m_timer;
}
void LifeFrame::UpdateInfoText()
{
wxString msg;
msg.Printf(_(" Generation: %lu (T: %lu ms), Population: %lu "),
m_tics,
m_topspeed? 0 : m_interval,
static_cast<unsigned long>(m_life->GetNumCells()));
m_text->SetLabel(msg);
}
// Enable or disable tools and menu entries according to the current
// state. See also wxEVT_UPDATE_UI events for a slightly different
// way to do this.
void LifeFrame::UpdateUI()
{
// start / stop
GetToolBar()->EnableTool(ID_START, !m_running);
GetToolBar()->EnableTool(wxID_STOP, m_running);
GetMenuBar()->Enable(ID_START, !m_running);
GetMenuBar()->Enable(ID_STEP, !m_running);
GetMenuBar()->Enable(wxID_STOP, m_running);
GetMenuBar()->Enable(ID_TOPSPEED, !m_topspeed);
// zooming
int cellsize = m_canvas->GetCellSize();
GetToolBar()->EnableTool(wxID_ZOOM_IN, cellsize < 32);
GetToolBar()->EnableTool(wxID_ZOOM_OUT, cellsize > 1);
GetMenuBar()->Enable(wxID_ZOOM_IN, cellsize < 32);
GetMenuBar()->Enable(wxID_ZOOM_OUT, cellsize > 1);
}
// Event handlers -----------------------------------------------------------
// OnMenu handles all events which don't have their own event handler
void LifeFrame::OnMenu(wxCommandEvent& event)
{
switch (event.GetId())
{
case wxID_NEW:
{
// stop if it was running
OnStop();
m_life->Clear();
m_canvas->Recenter(0, 0);
m_tics = 0;
UpdateInfoText();
break;
}
case wxID_ABOUT:
{
LifeAboutDialog dialog(this);
dialog.ShowModal();
break;
}
case wxID_EXIT:
{
// true is to force the frame to close
Close(true);
break;
}
case ID_SHOWNAV:
{
bool checked = GetMenuBar()->GetMenu(1)->IsChecked(ID_SHOWNAV);
if (m_navigator)
m_navigator->Show(checked);
break;
}
case ID_INFO:
{
wxString desc = m_life->GetDescription();
if ( desc.empty() )
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 wxID_STOP : OnStop(); break;
case ID_TOPSPEED:
{
m_running = true;
m_topspeed = true;
UpdateUI();
while (m_running && m_topspeed)
{
OnStep();
wxYield();
}
break;
}
}
}
#if wxUSE_FILEDLG
void LifeFrame::OnOpen(wxCommandEvent& WXUNUSED(event))
{
wxFileDialog filedlg(this,
_("Choose a file to open"),
wxEmptyString,
wxEmptyString,
_("Life patterns (*.lif)|*.lif|All files (*.*)|*.*"),
wxFD_OPEN | wxFD_FILE_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 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();
}
}
}
#endif
void LifeFrame::OnSamples(wxCommandEvent& WXUNUSED(event))
{
// stop if it was running
OnStop();
// dialog box
LifeSamplesDialog dialog(this);
if (dialog.ShowModal() == wxID_OK)
{
const LifePattern pattern = dialog.GetPattern();
// put the pattern
m_life->Clear();
m_life->SetPattern(pattern);
// recenter canvas
m_canvas->Recenter(0, 0);
m_tics = 0;
UpdateInfoText();
}
}
void LifeFrame::OnZoom(wxCommandEvent& event)
{
int cellsize = m_canvas->GetCellSize();
if ((event.GetId() == wxID_ZOOM_IN) && cellsize < 32)
{
m_canvas->SetCellSize(cellsize * 2);
UpdateUI();
}
else if ((event.GetId() == wxID_ZOOM_OUT) && 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;
default :
wxFAIL;
// Fall through!
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)
{
m_timer->Start(m_interval);
m_running = true;
UpdateUI();
}
}
void LifeFrame::OnStop()
{
if (m_running)
{
m_timer->Stop();
m_running = false;
m_topspeed = false;
UpdateUI();
}
}
void LifeFrame::OnStep()
{
if (m_life->NextTic())
m_tics++;
else
OnStop();
m_canvas->DrawChanged();
UpdateInfoText();
}
// --------------------------------------------------------------------------
// LifeNavigator miniframe
// --------------------------------------------------------------------------
LifeNavigator::LifeNavigator(wxWindow *parent)
: wxMiniFrame(parent, wxID_ANY,
_("Navigation"),
wxDefaultPosition,
wxDefaultSize,
wxCAPTION | wxSIMPLE_BORDER)
{
wxPanel *panel = new wxPanel(this, wxID_ANY);
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);
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
// --------------------------------------------------------------------------
// canvas constructor
LifeCanvas::LifeCanvas(wxWindow *parent, Life *life, bool interactive)
: wxWindow(parent, wxID_ANY, wxDefaultPosition, wxSize(100, 100),
wxFULL_REPAINT_ON_RESIZE | wxHSCROLL | wxVSCROLL
#if !defined(__SMARTPHONE__) && !defined(__POCKETPC__)
|wxSUNKEN_BORDER
#else
|wxSIMPLE_BORDER
#endif
)
{
m_life = life;
m_interactive = interactive;
m_cellsize = 8;
m_status = MOUSE_NOACTION;
m_viewportX = 0;
m_viewportY = 0;
m_viewportH = 0;
m_viewportW = 0;
if (m_interactive)
SetCursor(*wxCROSS_CURSOR);
// reduce flicker if wxEVT_ERASE_BACKGROUND is not available
SetBackgroundColour(*wxWHITE);
}
LifeCanvas::~LifeCanvas()
{
delete m_life;
}
// recenter at the given position
void LifeCanvas::Recenter(wxInt32 i, wxInt32 j)
{
m_viewportX = i - m_viewportW / 2;
m_viewportY = j - m_viewportH / 2;
// redraw everything
Refresh(false);
}
// set the cell size and refresh display
void LifeCanvas::SetCellSize(int cellsize)
{
m_cellsize = cellsize;
// find current center
wxInt32 cx = m_viewportX + m_viewportW / 2;
wxInt32 cy = m_viewportY + m_viewportH / 2;
// get current canvas size and adjust viewport accordingly
int w, h;
GetClientSize(&w, &h);
m_viewportW = (w + m_cellsize - 1) / m_cellsize;
m_viewportH = (h + m_cellsize - 1) / m_cellsize;
// recenter
m_viewportX = cx - m_viewportW / 2;
m_viewportY = cy - m_viewportH / 2;
// adjust scrollbars
if (m_interactive)
{
SetScrollbar(wxHORIZONTAL, m_viewportW, m_viewportW, 3 * m_viewportW);
SetScrollbar(wxVERTICAL, m_viewportH, m_viewportH, 3 * m_viewportH);
m_thumbX = m_viewportW;
m_thumbY = m_viewportH;
}
Refresh(false);
}
// draw a cell
void LifeCanvas::DrawCell(wxInt32 i, wxInt32 j, bool alive)
{
wxClientDC dc(this);
dc.SetPen(alive? *wxBLACK_PEN : *wxWHITE_PEN);
dc.SetBrush(alive? *wxBLACK_BRUSH : *wxWHITE_BRUSH);
DrawCell(i, j, dc);
}
void LifeCanvas::DrawCell(wxInt32 i, wxInt32 j, wxDC &dc)
{
wxCoord x = CellToX(i);
wxCoord y = CellToY(j);
// if cellsize is 1 or 2, there will be no grid
switch (m_cellsize)
{
case 1:
dc.DrawPoint(x, y);
break;
case 2:
dc.DrawRectangle(x, y, 2, 2);
break;
default:
dc.DrawRectangle(x + 1, y + 1, m_cellsize - 1, m_cellsize - 1);
}
}
// draw all changed cells
void LifeCanvas::DrawChanged()
{
wxClientDC dc(this);
size_t ncells;
LifeCell *cells;
bool done = false;
m_life->BeginFind(m_viewportX,
m_viewportY,
m_viewportX + m_viewportW,
m_viewportY + m_viewportH,
true);
if (m_cellsize == 1)
{
dc.SetPen(*wxBLACK_PEN);
}
else
{
dc.SetPen(*wxTRANSPARENT_PEN);
dc.SetBrush(*wxBLACK_BRUSH);
}
dc.SetLogicalFunction(wxINVERT);
while (!done)
{
done = m_life->FindMore(&cells, &ncells);
for (size_t m = 0; m < ncells; m++)
DrawCell(cells[m].i, cells[m].j, dc);
}
}
// event handlers
void LifeCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
{
wxPaintDC dc(this);
wxRect rect = GetUpdateRegion().GetBox();
wxCoord x, y, w, h;
wxInt32 i0, j0, i1, j1;
// find damaged area
x = rect.GetX();
y = rect.GetY();
w = rect.GetWidth();
h = rect.GetHeight();
i0 = XToCell(x);
j0 = YToCell(y);
i1 = XToCell(x + w - 1);
j1 = YToCell(y + h - 1);
size_t ncells;
LifeCell *cells;
m_life->BeginFind(i0, j0, i1, j1, false);
bool done = m_life->FindMore(&cells, &ncells);
// erase all damaged cells and draw the grid
dc.SetBrush(*wxWHITE_BRUSH);
if (m_cellsize <= 2)
{
// no grid
dc.SetPen(*wxWHITE_PEN);
dc.DrawRectangle(x, y, w, h);
}
else
{
x = CellToX(i0);
y = CellToY(j0);
w = CellToX(i1 + 1) - x + 1;
h = CellToY(j1 + 1) - y + 1;
dc.SetPen(*wxLIGHT_GREY_PEN);
for (wxInt32 yy = y; yy <= (y + h - m_cellsize); yy += m_cellsize)
dc.DrawRectangle(x, yy, w, m_cellsize + 1);
for (wxInt32 xx = x; xx <= (x + w - m_cellsize); xx += m_cellsize)
dc.DrawLine(xx, y, xx, y + h);
}
// draw all alive cells
dc.SetPen(*wxBLACK_PEN);
dc.SetBrush(*wxBLACK_BRUSH);
while (!done)
{
for (size_t m = 0; m < ncells; m++)
DrawCell(cells[m].i, cells[m].j, dc);
done = m_life->FindMore(&cells, &ncells);
}
// last set
for (size_t m = 0; m < ncells; m++)
DrawCell(cells[m].i, cells[m].j, dc);
}
void LifeCanvas::OnMouse(wxMouseEvent& event)
{
if (!m_interactive)
return;
// which cell are we pointing at?
wxInt32 i = XToCell( event.GetX() );
wxInt32 j = YToCell( event.GetY() );
#if wxUSE_STATUSBAR
// set statusbar text
wxString msg;
msg.Printf(_("Cell: (%d, %d)"), i, j);
((LifeFrame *) wxGetApp().GetTopWindow())->SetStatusText(msg, 1);
#endif // wxUSE_STATUSBAR
// 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.
// is the button down?
if (!event.LeftIsDown())
{
m_status = MOUSE_NOACTION;
return;
}
// 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);
// 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
{
// 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;
}
((LifeFrame *) wxGetApp().GetTopWindow())->UpdateInfoText();
}
void LifeCanvas::OnSize(wxSizeEvent& event)
{
// find center
wxInt32 cx = m_viewportX + m_viewportW / 2;
wxInt32 cy = m_viewportY + m_viewportH / 2;
// get new size
wxCoord w = event.GetSize().GetX();
wxCoord h = event.GetSize().GetY();
m_viewportW = (w + m_cellsize - 1) / m_cellsize;
m_viewportH = (h + m_cellsize - 1) / m_cellsize;
// recenter
m_viewportX = cx - m_viewportW / 2;
m_viewportY = cy - m_viewportH / 2;
// scrollbars
if (m_interactive)
{
SetScrollbar(wxHORIZONTAL, m_viewportW, m_viewportW, 3 * m_viewportW);
SetScrollbar(wxVERTICAL, m_viewportH, m_viewportH, 3 * m_viewportH);
m_thumbX = m_viewportW;
m_thumbY = m_viewportH;
}
// allow default processing
event.Skip();
}
void LifeCanvas::OnScroll(wxScrollWinEvent& event)
{
WXTYPE type = (WXTYPE)event.GetEventType();
int pos = event.GetPosition();
int orient = event.GetOrientation();
// calculate scroll increment
int scrollinc = 0;
if (type == wxEVT_SCROLLWIN_TOP)
{
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)
{
scrollinc = pos - m_thumbX;
m_thumbX = pos;
}
else
{
scrollinc = pos - m_thumbY;
m_thumbY = pos;
}
}
else
if (type == wxEVT_SCROLLWIN_THUMBRELEASE)
{
m_thumbX = m_viewportW;
m_thumbY = m_viewportH;
}
#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);
}
#endif
if (scrollinc == 0) return;
// scroll the window and adjust the viewport
if (orient == wxHORIZONTAL)
{
m_viewportX += scrollinc;
ScrollWindow( -m_cellsize * scrollinc, 0, (const wxRect *) NULL);
}
else
{
m_viewportY += scrollinc;
ScrollWindow( 0, -m_cellsize * scrollinc, (const wxRect *) NULL);
}
}
void LifeCanvas::OnEraseBackground(wxEraseEvent& WXUNUSED(event))
{
// do nothing. I just don't want the background to be erased, you know.
}
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