wxWidgets/samples/image/image.cpp

/*
 * Program: image
 * 
 * Author: Robert Roebling
 *
 * Copyright: (C) 1998, Robert Roebling
 *
 */

#include "wx/wx.h"
#include "wx/image.h"

// derived classes

class MyFrame;
class MyApp;

// MyCanvas

class MyCanvas: public wxScrolledWindow
{
  DECLARE_DYNAMIC_CLASS(MyCanvas)
  
  public:
  
    MyCanvas(void) {};
    MyCanvas( wxWindow *parent, wxWindowID, const wxPoint &pos, const wxSize &size );
    ~MyCanvas(void);
    void OnPaint( wxPaintEvent &event );
    
    wxBitmap  *my_horse;
    wxBitmap  *my_square;
    
  DECLARE_EVENT_TABLE()
};

// MyFrame

class MyFrame: public wxFrame
{
  DECLARE_DYNAMIC_CLASS(MyFrame)

  public:
  
    MyFrame(void);
    void OnSize( wxSizeEvent &event );
    void OnAbout( wxCommandEvent &event );
    void OnQuit( wxCommandEvent &event );
    
    MyCanvas         *m_canvas;
    
  DECLARE_EVENT_TABLE()
};

// MyApp

class MyApp: public wxApp
{
  public:
  
    MyApp(void);
    virtual bool OnInit(void);
};

// main program

IMPLEMENT_APP(MyApp)

// MyCanvas

IMPLEMENT_DYNAMIC_CLASS(MyCanvas, wxScrolledWindow)

BEGIN_EVENT_TABLE(MyCanvas,wxScrolledWindow)
  EVT_PAINT  (MyCanvas::OnPaint)
END_EVENT_TABLE()

MyCanvas::MyCanvas( wxWindow *parent, const wxWindowID id, const wxPoint &pos, const wxSize &size ) 
  : wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER ) 
{
  wxImage image;

  wxBitmap bitmap( 100, 100 );
  
  wxMemoryDC dc;
  dc.SelectObject( bitmap );
  dc.SetBrush( wxBrush( "orange", wxSOLID ) );
  dc.SetPen( *wxWHITE_PEN );
  dc.DrawRectangle( 0, 0, 100, 100 );
  dc.SelectObject( wxNullBitmap );
  
  image = bitmap.ConvertToImage();
  image.SaveFile( "../test.png", wxBITMAP_TYPE_PNG );
  
  image.LoadFile( "../horse.png", wxBITMAP_TYPE_PNG );
  my_horse = new wxBitmap( image );
  
  image.LoadFile( "../test.png", wxBITMAP_TYPE_PNG );
  my_square = new wxBitmap( image );
}

MyCanvas::~MyCanvas(void)
{
  delete my_horse;
  delete my_square;
}

void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
  wxPaintDC dc( this );
  PrepareDC( dc );

  dc.DrawText( "Loaded image", 30, 100 );
  if (my_square->Ok()) dc.DrawBitmap( *my_square, 30, 120 );
  
  dc.DrawText( "Drawn directly", 150, 100 );
  dc.SetBrush( wxBrush( "orange", wxSOLID ) );
  dc.SetPen( *wxWHITE_PEN );
  dc.DrawRectangle( 150, 120, 100, 100 );
  
  if (my_horse->Ok()) dc.DrawBitmap( *my_horse, 30, 240 );
}

// MyFrame

const  ID_QUIT  = 108;
const  ID_ABOUT = 109;

IMPLEMENT_DYNAMIC_CLASS( MyFrame, wxFrame )

BEGIN_EVENT_TABLE(MyFrame,wxFrame)
  EVT_MENU    (ID_ABOUT, MyFrame::OnAbout)
  EVT_MENU    (ID_QUIT,  MyFrame::OnQuit)
  EVT_SIZE    (MyFrame::OnSize)
END_EVENT_TABLE()

MyFrame::MyFrame(void) :
  wxFrame( (wxFrame *) NULL, -1, "wxImage sample", wxPoint(20,20), wxSize(470,360) )
{
  wxMenu *file_menu = new wxMenu();
  file_menu->Append( ID_ABOUT, "About..");
  file_menu->Append( ID_QUIT, "Exit");
  
  wxMenuBar *menu_bar = new wxMenuBar();
  menu_bar->Append(file_menu, "File");
  menu_bar->Show( TRUE );
  
  SetMenuBar( menu_bar );
  
  CreateStatusBar(2);
  int widths[] = { -1, 100 };
  SetStatusWidths( 2, widths );
  
  m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
  m_canvas->SetScrollbars( 10, 10, 50, 50 );
}

void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
{
  Close( TRUE );
}

void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
{
  (void) wxMessageBox( "wxImage demo\nRobert Roebling (c) 1998", "About wxImage Demo", wxOK );
}

void MyFrame::OnSize( wxSizeEvent &WXUNUSED(event) )
{
  int w,h;
  GetClientSize( &w, &h );
  m_canvas->SetSize( w, h );
}

//-----------------------------------------------------------------------------
// MyApp
//-----------------------------------------------------------------------------

MyApp::MyApp(void) : 
  wxApp( )
{
}

bool MyApp::OnInit(void)
{
  wxImage::AddHandler( new wxPNGHandler );
  
  wxFrame *frame = new MyFrame();
  frame->Show( TRUE );
  
  return TRUE;
}