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wxWidgets/samples/image/image.cpp
Guillermo Rodriguez Garcia 176fe5af12 Solved multiple memory leaks. 
Added some comments (on-screen, not to the code)
Inverted the original XBM file.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6150 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2000-02-19 04:22:08 +00:00

496 lines
13 KiB
C++
Raw Blame History

/*
* Program: image
*
* Author: Robert Roebling
*
* Copyright: (C) 1998, Robert Roebling
*
*/
// 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/image.h"
#include "wx/file.h"
#include "smile.xbm"
#include "smile.xpm"
// derived classes
class MyFrame;
class MyApp;
// MyCanvas
class MyCanvas: public wxScrolledWindow
{
public:
MyCanvas() {};
MyCanvas( wxWindow *parent, wxWindowID, const wxPoint &pos, const wxSize &size );
~MyCanvas();
void OnPaint( wxPaintEvent &event );
void CreateAntiAliasedBitmap();
wxBitmap *my_horse_png;
wxBitmap *my_horse_jpeg;
wxBitmap *my_horse_gif;
wxBitmap *my_horse_bmp;
wxBitmap *my_horse_pcx;
wxBitmap *my_horse_pnm;
wxBitmap *my_horse_tiff;
wxBitmap *my_smile_xbm;
wxBitmap *my_square;
wxBitmap *my_anti;
protected:
wxBitmap m_bmpSmileXpm;
wxIcon m_iconSmileXpm;
private:
DECLARE_DYNAMIC_CLASS(MyCanvas)
DECLARE_EVENT_TABLE()
};
// MyFrame
class MyFrame: public wxFrame
{
public:
MyFrame();
void OnAbout( wxCommandEvent &event );
void OnQuit( wxCommandEvent &event );
MyCanvas *m_canvas;
private:
DECLARE_DYNAMIC_CLASS(MyFrame)
DECLARE_EVENT_TABLE()
};
// MyApp
class MyApp: public wxApp
{
public:
virtual bool OnInit();
};
// 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, wxWindowID id,
const wxPoint &pos, const wxSize &size )
: wxScrolledWindow( parent, id, pos, size, wxSUNKEN_BORDER )
#if !defined(__WINDOWS__) || wxUSE_XPM_IN_MSW
, m_bmpSmileXpm((const char **) smile_xpm)
, m_iconSmileXpm((const char **) smile_xpm)
#endif
{
my_horse_png = (wxBitmap*) NULL;
my_horse_jpeg = (wxBitmap*) NULL;
my_horse_gif = (wxBitmap*) NULL;
my_horse_bmp = (wxBitmap*) NULL;
my_horse_pcx = (wxBitmap*) NULL;
my_horse_pnm = (wxBitmap*) NULL;
my_horse_tiff = (wxBitmap*) NULL;
my_smile_xbm = (wxBitmap*) NULL;
my_square = (wxBitmap*) NULL;
my_anti = (wxBitmap*) NULL;
SetBackgroundColour(* wxWHITE);
wxBitmap bitmap( 100, 100 );
wxMemoryDC dc;
dc.SelectObject( bitmap );
dc.SetBrush( wxBrush( "orange", wxSOLID ) );
dc.SetPen( *wxBLACK_PEN );
dc.DrawRectangle( 0, 0, 100, 100 );
dc.SetBrush( *wxWHITE_BRUSH );
dc.DrawRectangle( 20, 20, 60, 60 );
dc.SelectObject( wxNullBitmap );
// try to find the directory with our images
wxString dir;
if ( wxFile::Exists("./horse.png") )
dir = "./";
else if ( wxFile::Exists("../horse.png") )
dir = "../";
else
wxLogWarning("Can't find image files in either '.' or '..'!");
wxImage image( bitmap );
#if wxUSE_LIBPNG
if ( !image.SaveFile( dir + wxString("test.png"), wxBITMAP_TYPE_PNG ))
wxLogError("Can't save file");
image.Destroy();
image.LoadFile( dir + wxString("test.png") );
my_square = new wxBitmap( image.ConvertToBitmap() );
image.Destroy();
if ( !image.LoadFile( dir + wxString("horse.png")) )
wxLogError("Can't load PNG image");
else
my_horse_png = new wxBitmap( image.ConvertToBitmap() );
#endif // wxUSE_LIBPNG
#if wxUSE_LIBJPEG
image.Destroy();
if ( !image.LoadFile( dir + wxString("horse.jpg")) )
wxLogError("Can't load JPG image");
else
my_horse_jpeg = new wxBitmap( image.ConvertToBitmap() );
#endif // wxUSE_LIBJPEG
#if wxUSE_GIF
image.Destroy();
if ( !image.LoadFile( dir + wxString("horse.gif")) )
wxLogError("Can't load GIF image");
else
my_horse_gif = new wxBitmap( image.ConvertToBitmap() );
#endif
#if wxUSE_PCX
image.Destroy();
if ( !image.LoadFile( dir + wxString("horse.pcx"), wxBITMAP_TYPE_PCX ) )
wxLogError("Can't load PCX image");
else
my_horse_pcx = new wxBitmap( image.ConvertToBitmap() );
#endif
image.Destroy();
if ( !image.LoadFile( dir + wxString("horse.bmp"), wxBITMAP_TYPE_BMP ) )
wxLogError("Can't load BMP image");
else
my_horse_bmp = new wxBitmap( image.ConvertToBitmap() );
#if wxUSE_PNM
image.Destroy();
if ( !image.LoadFile( dir + wxString("horse.pnm"), wxBITMAP_TYPE_PNM ) )
wxLogError("Can't load PNM image");
else
my_horse_pnm = new wxBitmap( image.ConvertToBitmap() );
#endif
#if wxUSE_LIBTIFF
image.Destroy();
if ( !image.LoadFile( dir + wxString("horse.tif"), wxBITMAP_TYPE_TIF ) )
wxLogError("Can't load TIFF image");
else
my_horse_tiff = new wxBitmap( image.ConvertToBitmap() );
#endif
CreateAntiAliasedBitmap();
my_smile_xbm = new wxBitmap( (const char*)smile_bits, smile_width,
smile_height, 1 );
#ifndef __WXGTK__
#if !defined(__WINDOWS__) || wxUSE_XPM_IN_MSW
// demonstrates XPM automatically using the mask when saving
if ( m_bmpSmileXpm.Ok() )
m_bmpSmileXpm.SaveFile("saved.xpm", wxBITMAP_TYPE_XPM);
#endif
#endif
}
MyCanvas::~MyCanvas()
{
delete my_horse_pnm;
delete my_horse_png;
delete my_horse_jpeg;
delete my_horse_gif;
delete my_horse_bmp;
delete my_horse_pcx;
delete my_horse_tiff;
delete my_smile_xbm;
delete my_square;
delete my_anti;
}
void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
wxPaintDC dc( this );
PrepareDC( dc );
dc.DrawText( "Loaded image", 30, 10 );
if (my_square && my_square->Ok()) dc.DrawBitmap( *my_square, 30, 30 );
dc.DrawText( "Drawn directly", 150, 10 );
dc.SetBrush( wxBrush( "orange", wxSOLID ) );
dc.SetPen( *wxBLACK_PEN );
dc.DrawRectangle( 150, 30, 100, 100 );
dc.SetBrush( *wxWHITE_BRUSH );
dc.DrawRectangle( 170, 50, 60, 60 );
if (my_anti && my_anti->Ok())
dc.DrawBitmap( *my_anti, 280, 30 );
dc.DrawText( "PNG handler", 30, 135 );
if (my_horse_png && my_horse_png->Ok())
{
dc.DrawBitmap( *my_horse_png, 30, 150 );
wxRect rect(0,0,100,100);
wxBitmap sub( my_horse_png->GetSubBitmap(rect) );
dc.DrawText( "GetSubBitmap()", 280, 190 );
dc.DrawBitmap( sub, 280, 210 );
}
dc.DrawText( "JPEG handler", 30, 365 );
if (my_horse_jpeg && my_horse_jpeg->Ok())
dc.DrawBitmap( *my_horse_jpeg, 30, 380 );
dc.DrawText( "GIF handler", 30, 595 );
if (my_horse_gif && my_horse_gif->Ok())
dc.DrawBitmap( *my_horse_gif, 30, 610 );
dc.DrawText( "PCX handler", 30, 825 );
if (my_horse_pcx && my_horse_pcx->Ok())
dc.DrawBitmap( *my_horse_pcx, 30, 840 );
dc.DrawText( "BMP handler", 30, 1055 );
if (my_horse_bmp && my_horse_bmp->Ok())
dc.DrawBitmap( *my_horse_bmp, 30, 1070 );
dc.DrawText( "PNM handler", 30, 1285 );
if (my_horse_pnm && my_horse_pnm->Ok())
dc.DrawBitmap( *my_horse_pnm, 30, 1300 );
dc.DrawText( "TIFF handler", 30, 1515 );
if (my_horse_tiff && my_horse_tiff->Ok())
dc.DrawBitmap( *my_horse_tiff, 30, 1530 );
if (my_smile_xbm && my_smile_xbm->Ok())
{
dc.DrawText( "XBM bitmap", 30, 1745 );
dc.DrawText( "(green on red)", 30, 1760 );
dc.SetTextForeground( "GREEN" );
dc.SetTextBackground( "RED" );
dc.DrawBitmap( *my_smile_xbm, 30, 1780 );
dc.SetTextForeground( "BLACK" );
dc.DrawText( "After wxImage conversion", 150, 1745 );
dc.DrawText( "(red on white)", 150, 1760 );
dc.SetTextForeground( "RED" );
wxImage i( *my_smile_xbm );
i.SetMaskColour( 255, 255, 255 );
i.Replace( 0, 0, 0,
wxRED_PEN->GetColour().Red(),
wxRED_PEN->GetColour().Green(),
wxRED_PEN->GetColour().Blue() );
dc.DrawBitmap( i.ConvertToBitmap(), 150, 1780, TRUE );
dc.SetTextForeground( "BLACK" );
}
wxBitmap mono( 60,50,1 );
wxMemoryDC memdc;
memdc.SelectObject( mono );
memdc.SetPen( *wxBLACK_PEN );
memdc.SetBrush( *wxWHITE_BRUSH );
memdc.DrawRectangle( 0,0,60,50 );
memdc.SetTextForeground( *wxBLACK );
memdc.DrawText( "Hi!", 5, 5 );
memdc.SetBrush( *wxBLACK_BRUSH );
memdc.DrawRectangle( 33,5,20,20 );
memdc.SetPen( *wxRED_PEN );
memdc.DrawLine( 5, 42, 50, 42 );
memdc.SelectObject( wxNullBitmap );
if (mono.Ok())
{
dc.DrawText( "Mono bitmap", 30, 1865 );
dc.DrawText( "(red on green)", 30, 1880 );
dc.SetTextForeground( "RED" );
dc.SetTextBackground( "GREEN" );
dc.DrawBitmap( mono, 30, 1900 );
dc.SetTextForeground( "BLACK" );
dc.DrawText( "After wxImage conversion", 150, 1865 );
dc.DrawText( "(red on white)", 150, 1880 );
dc.SetTextForeground( "RED" );
wxImage i( mono );
i.SetMaskColour( 255,255,255 );
i.Replace( 0,0,0,
wxRED_PEN->GetColour().Red(),
wxRED_PEN->GetColour().Green(),
wxRED_PEN->GetColour().Blue() );
dc.DrawBitmap( i.ConvertToBitmap(), 150, 1900, TRUE );
dc.SetTextForeground( "BLACK" );
}
dc.DrawText("XPM bitmap", 30, 2000);
if ( m_bmpSmileXpm.Ok() )
{
dc.DrawBitmap(m_bmpSmileXpm, 30, 2020, TRUE);
}
dc.DrawText("XPM icon", 150, 2000);
if ( m_iconSmileXpm.Ok() )
{
dc.DrawIcon(m_iconSmileXpm, 150, 2020);
}
}
void MyCanvas::CreateAntiAliasedBitmap()
{
wxBitmap bitmap( 300, 300 );
wxMemoryDC dc;
dc.SelectObject( bitmap );
dc.Clear();
dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL) );
dc.SetTextForeground( "RED" );
dc.DrawText( "This is anti-aliased Text.", 20, 20 );
dc.DrawText( "And a Rectangle.", 20, 60 );
dc.SetBrush( *wxRED_BRUSH );
dc.SetPen( *wxTRANSPARENT_PEN );
dc.DrawRoundedRectangle( 20, 100, 200, 180, 20 );
wxImage original( bitmap );
wxImage anti( 150, 150 );
/* This is quite slow, but safe. Use wxImage::GetData() for speed instead. */
for (int y = 1; y < 149; y++)
for (int x = 1; x < 149; x++)
{
int red = original.GetRed( x*2, y*2 ) +
original.GetRed( x*2-1, y*2 ) +
original.GetRed( x*2, y*2+1 ) +
original.GetRed( x*2+1, y*2+1 );
red = red/4;
int green = original.GetGreen( x*2, y*2 ) +
original.GetGreen( x*2-1, y*2 ) +
original.GetGreen( x*2, y*2+1 ) +
original.GetGreen( x*2+1, y*2+1 );
green = green/4;
int blue = original.GetBlue( x*2, y*2 ) +
original.GetBlue( x*2-1, y*2 ) +
original.GetBlue( x*2, y*2+1 ) +
original.GetBlue( x*2+1, y*2+1 );
blue = blue/4;
anti.SetRGB( x, y, red, green, blue );
}
my_anti = new wxBitmap( anti.ConvertToBitmap() );
}
// MyFrame
const int ID_QUIT = 108;
const int 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)
END_EVENT_TABLE()
MyFrame::MyFrame()
: 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, "E&xit");
wxMenuBar *menu_bar = new wxMenuBar();
menu_bar->Append(file_menu, "&File");
SetMenuBar( menu_bar );
CreateStatusBar(2);
int widths[] = { -1, 100 };
SetStatusWidths( 2, widths );
m_canvas = new MyCanvas( this, -1, wxPoint(0,0), wxSize(10,10) );
// 500 width * 2100 height
m_canvas->SetScrollbars( 10, 10, 50, 220 );
}
void MyFrame::OnQuit( wxCommandEvent &WXUNUSED(event) )
{
Close( TRUE );
}
void MyFrame::OnAbout( wxCommandEvent &WXUNUSED(event) )
{
(void)wxMessageBox( "wxImage demo\n"
"Robert Roebling (c) 1998,2000",
"About wxImage Demo", wxICON_INFORMATION | wxOK );
}
//-----------------------------------------------------------------------------
// MyApp
//-----------------------------------------------------------------------------
bool MyApp::OnInit()
{
#if wxUSE_LIBPNG
wxImage::AddHandler( new wxPNGHandler );
#endif
#if wxUSE_LIBJPEG
wxImage::AddHandler( new wxJPEGHandler );
#endif
#if wxUSE_LIBTIFF
wxImage::AddHandler( new wxTIFFHandler );
#endif
#if wxUSE_GIF
wxImage::AddHandler( new wxGIFHandler );
#endif
#if wxUSE_PCX
wxImage::AddHandler( new wxPCXHandler );
#endif
#if wxUSE_PNM
wxImage::AddHandler( new wxPNMHandler );
#endif
wxFrame *frame = new MyFrame();
frame->Show( TRUE );
return TRUE;
}
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