wxWidgets/samples/drawing/drawing.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        drawing.cpp
// Purpose:     Minimal wxWindows sample
// Author:      Robert Roebling
// Modified by:
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#ifdef __GNUG__
    #pragma implementation "minimal.cpp"
    #pragma interface "minimal.cpp"
#endif

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

// for all others, include the necessary headers (this file is usually all you
// need because it includes almost all "standard" wxWindows headers
#ifndef WX_PRECOMP
    #include "wx/wx.h"
#endif

// ----------------------------------------------------------------------------
// ressources
// ----------------------------------------------------------------------------
// the application icon
#if defined(__WXGTK__) || defined(__WXMOTIF__)
    #include "mondrian.xpm"
#endif

// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------

// Define a new application type, each program should derive a class from wxApp
class MyApp : public wxApp
{
public:
    // override base class virtuals
    // ----------------------------

    // this one is called on application startup and is a good place for the app
    // initialization (doing it here and not in the ctor allows to have an error
    // return: if OnInit() returns false, the application terminates)
    virtual bool OnInit();
};

// Define a new frame type: this is going to be our main frame
class MyFrame : public wxFrame
{
public:
    // ctor(s)
    MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);

    // event handlers (these functions should _not_ be virtual)
    void OnQuit(wxCommandEvent& event);
    void OnAbout(wxCommandEvent& event);
    void OnPaint(wxPaintEvent &event);
    void OnOption(wxCommandEvent &event);
    void OnMouseMove(wxMouseEvent &event);

    int      m_mapMode;
    double   m_xUserScale;
    double   m_yUserScale;
    int      m_xLogicalOrigin;
    int      m_yLogicalOrigin;

private:
    // any class wishing to process wxWindows events must use this macro
    DECLARE_EVENT_TABLE()
};

// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

// IDs for the controls and the menu commands
enum
{
    // menu items
    Minimal_Quit = 1,
    Minimal_About,
    
    MapMode_Text,
    MapMode_Lometric,
    MapMode_Twips,
    MapMode_Points,
    MapMode_Metric,
    
    UserScale_StretchHoriz,
    UserScale_ShrinkHoriz,
    UserScale_StretchVertic,
    UserScale_ShrinkVertic,
    
    AxisMirror_Horiz,
    AxisMirror_Vertic,
    
    LogicalOrigin_MoveDown,
    LogicalOrigin_MoveUp,
    LogicalOrigin_MoveLeft,
    LogicalOrigin_MoveRight,
    
};

// ----------------------------------------------------------------------------
// event tables and other macros for wxWindows
// ----------------------------------------------------------------------------

// the event tables connect the wxWindows events with the functions (event
// handlers) which process them. It can be also done at run-time, but for the
// simple menu events like this the static method is much simpler.
BEGIN_EVENT_TABLE(MyFrame, wxFrame)

    EVT_MOTION (MyFrame::OnMouseMove)
    EVT_PAINT  (MyFrame::OnPaint)
    
    EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
    EVT_MENU(Minimal_About, MyFrame::OnAbout)
    
    EVT_MENU(MapMode_Text, MyFrame::OnOption)
    EVT_MENU(MapMode_Lometric, MyFrame::OnOption)
    EVT_MENU(MapMode_Twips, MyFrame::OnOption)
    EVT_MENU(MapMode_Points, MyFrame::OnOption)
    EVT_MENU(MapMode_Metric, MyFrame::OnOption)
    
    EVT_MENU(UserScale_StretchHoriz, MyFrame::OnOption)
    EVT_MENU(UserScale_ShrinkHoriz, MyFrame::OnOption)
    EVT_MENU(UserScale_StretchVertic, MyFrame::OnOption)
    EVT_MENU(UserScale_ShrinkVertic, MyFrame::OnOption)
    
    EVT_MENU(AxisMirror_Horiz, MyFrame::OnOption)
    EVT_MENU(AxisMirror_Vertic, MyFrame::OnOption)
    
    EVT_MENU(LogicalOrigin_MoveDown, MyFrame::OnOption)
    EVT_MENU(LogicalOrigin_MoveUp, MyFrame::OnOption)
    EVT_MENU(LogicalOrigin_MoveLeft, MyFrame::OnOption)
    EVT_MENU(LogicalOrigin_MoveRight, MyFrame::OnOption)
END_EVENT_TABLE()

// Create a new application object: this macro will allow wxWindows to create
// the application object during program execution (it's better than using a
// static object for many reasons) and also declares the accessor function
// wxGetApp() which will return the reference of the right type (i.e. MyApp and
// not wxApp)
IMPLEMENT_APP(MyApp)

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// the application class
// ----------------------------------------------------------------------------

// `Main program' equivalent: the program execution "starts" here
bool MyApp::OnInit()
{
    // Create the main application window
    MyFrame *frame = new MyFrame("Drawing sample",
                                 wxPoint(50, 50), wxSize(450, 340));

    // Show it and tell the application that it's our main window
    // @@@ what does it do exactly, in fact? is it necessary here?
    frame->Show(TRUE);
    SetTopWindow(frame);

    // success: wxApp::OnRun() will be called which will enter the main message
    // loop and the application will run. If we returned FALSE here, the
    // application would exit immediately.
    return TRUE;
}

// ----------------------------------------------------------------------------
// main frame
// ----------------------------------------------------------------------------

// frame constructor
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
       : wxFrame((wxFrame *)NULL, -1, title, pos, size)
{
    // set the frame icon
    SetIcon(wxICON(mondrian));

    wxMenu *menuFile = new wxMenu;
    menuFile->Append(Minimal_About, "&About...\tCtrl-A", "Show about dialog");
    menuFile->AppendSeparator();
    menuFile->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
    
    wxMenu *menuMapMode = new wxMenu;
    menuMapMode->Append( MapMode_Text, "&TEXT map mode" );
    menuMapMode->Append( MapMode_Lometric, "&LOMETRIC map mode" );
    menuMapMode->Append( MapMode_Twips, "T&WIPS map mode" );
    menuMapMode->Append( MapMode_Points, "&POINTS map mode" );
    menuMapMode->Append( MapMode_Metric, "&METRIC map mode" );
    
    wxMenu *menuUserScale = new wxMenu;
    menuUserScale->Append( UserScale_StretchHoriz, "Stretch horizontally\tCtrl-H" );
    menuUserScale->Append( UserScale_ShrinkHoriz, "Shrink  horizontally\tCtrl-G" );
    menuUserScale->Append( UserScale_StretchVertic, "Stretch vertically\tCtrl-V" );
    menuUserScale->Append( UserScale_ShrinkVertic, "Shrink vertically\tCtrl-W" );
    
    wxMenu *menuAxis = new wxMenu;
    menuAxis->Append( AxisMirror_Horiz, "Mirror horizontally" );
    menuAxis->Append( AxisMirror_Vertic, "Mirror vertically" );
    
    wxMenu *menuLogical = new wxMenu;
    menuLogical->Append( LogicalOrigin_MoveDown, "Move &down\tCtrl-D" );
    menuLogical->Append( LogicalOrigin_MoveUp, "Move &up\tCtrl-U" );
    menuLogical->Append( LogicalOrigin_MoveLeft, "Move &right\tCtrl-L" );
    menuLogical->Append( LogicalOrigin_MoveRight, "Move &left\tCtrl-R" );

    // now append the freshly created menu to the menu bar...
    wxMenuBar *menuBar = new wxMenuBar;
    menuBar->Append(menuFile, "&File");
    menuBar->Append(menuMapMode, "&MapMode");
    menuBar->Append(menuUserScale, "&UserScale");
    menuBar->Append(menuAxis, "&Axis");
    menuBar->Append(menuLogical, "&LogicalOrigin");

    // ... and attach this menu bar to the frame
    SetMenuBar(menuBar);

    // create a status bar just for fun (by default with 1 pane only)
    CreateStatusBar(2);
    SetStatusText("Welcome to wxWindows!");
    
    m_mapMode = wxMM_TEXT;
    m_xUserScale = 1.0;
    m_yUserScale = 1.0;
    m_xLogicalOrigin = 0;
    m_yLogicalOrigin = 0;
}


// event handlers

void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
    // TRUE is to force the frame to close
    Close(TRUE);
}

void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{
    wxString msg;
    msg.Printf( _T("This is the about dialog of the drawing sample.\n")
                _T("Copyright (c) Robert Roebling 1999")
              );

    wxMessageBox(msg, "About Drawing", wxOK | wxICON_INFORMATION, this);
}

void MyFrame::OnOption(wxCommandEvent &event)
{
    switch (event.GetInt())
    {
        case MapMode_Text:
            m_mapMode = wxMM_TEXT;
	    break;
        case MapMode_Lometric:
            m_mapMode = wxMM_LOMETRIC;
	    break;
	case MapMode_Twips:
            m_mapMode = wxMM_TWIPS;
	    break;
	case MapMode_Points:
            m_mapMode = wxMM_POINTS;
	    break;
	case MapMode_Metric:
            m_mapMode = wxMM_METRIC;
	    break;
	case LogicalOrigin_MoveDown:
	    m_yLogicalOrigin += 10;
	    break;
	case LogicalOrigin_MoveUp:
	    m_yLogicalOrigin -= 10;
	    break;
	case LogicalOrigin_MoveLeft:
	    m_xLogicalOrigin += 10;
	    break;
	case LogicalOrigin_MoveRight:
	    m_xLogicalOrigin -= 10;
	    break;
	case UserScale_StretchHoriz:
	    m_xUserScale *= 1.10;
	    break;
	case UserScale_ShrinkHoriz:
	    m_xUserScale /= 1.10;
	    break;
	case UserScale_StretchVertic:
	    m_yUserScale *= 1.10;
	    break;
	case UserScale_ShrinkVertic:
	    m_yUserScale /= 1.10;
	    break;
    }
    
    Refresh();
}

void MyFrame::OnPaint(wxPaintEvent &WXUNUSED(event) )
{
  wxPaintDC dc(this);
  dc.SetMapMode( m_mapMode );
  dc.SetUserScale( m_xUserScale, m_yUserScale );
  dc.SetLogicalOrigin( m_xLogicalOrigin, m_yLogicalOrigin );

  dc.DrawRectangle( 10, 10, 90, 90 );
  dc.DrawRoundedRectangle( 10, 110, 90, 90, 5 );
  
  dc.DrawText( "This is text.", 110, 10 );
  
  dc.DrawIcon( wxICON(mondrian), 110, 40 );
}

void MyFrame::OnMouseMove(wxMouseEvent &event)
{
  wxClientDC dc(this);
  dc.SetMapMode( m_mapMode );
  dc.SetUserScale( m_xUserScale, m_yUserScale );
  dc.SetLogicalOrigin( m_xLogicalOrigin, m_yLogicalOrigin );

  wxPoint pos = event.GetPosition();
  long x = dc.DeviceToLogicalX( pos.x );
  long y = dc.DeviceToLogicalY( pos.y );
  wxString str;
  str.Printf( "Current mouse position: %d,%d", (int)x, (int)y );
  SetStatusText( str );
}