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wxWidgets/samples/image/canvas.cpp
Francesco Montorsi 09ddabf738 no real change; just reorganize the sample splitting it in two source files 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58102 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2009-01-14 17:41:21 +00:00

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///////////////////////////////////////////////////////////////////////////////
// Name: samples/image/canvas.cpp
// Purpose: sample showing operations with wxImage
// Author: Robert Roebling
// Modified by: Francesco Montorsi
// Created: 1998
// RCS-ID: $Id$
// Copyright: (c) 1998-2005 Robert Roebling
// License: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
// 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 "wx/filename.h"
#include "wx/mstream.h"
#include "wx/wfstream.h"
#include "wx/quantize.h"
#include "wx/stopwatch.h"
#if wxUSE_CLIPBOARD
#include "wx/dataobj.h"
#include "wx/clipbrd.h"
#endif // wxUSE_CLIPBOARD
#include "smile.xbm"
#include "smile.xpm"
#include "canvas.h"
//-----------------------------------------------------------------------------
// MyCanvas
//-----------------------------------------------------------------------------
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 )
, m_bmpSmileXpm(smile_xpm)
, m_iconSmileXpm(smile_xpm)
{
my_horse_ani = NULL;
m_ani_images = 0 ;
SetBackgroundColour(* wxWHITE);
wxBitmap bitmap( 100, 100 );
wxMemoryDC dc;
dc.SelectObject( bitmap );
dc.SetBrush( wxBrush( wxT("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(wxT("./horse.png")) )
dir = wxT("./");
else if ( wxFile::Exists(wxT("../horse.png")) )
dir = wxT("../");
else
wxLogWarning(wxT("Can't find image files in either '.' or '..'!"));
wxImage image = bitmap.ConvertToImage();
#if wxUSE_LIBPNG
if ( !image.SaveFile( dir + _T("test.png"), wxBITMAP_TYPE_PNG ))
wxLogError(wxT("Can't save file"));
image.Destroy();
if ( image.LoadFile( dir + _T("test.png") ) )
my_square = wxBitmap( image );
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.png")) )
wxLogError(wxT("Can't load PNG image"));
else
my_horse_png = wxBitmap( image );
if ( !image.LoadFile( dir + _T("toucan.png")) )
wxLogError(wxT("Can't load PNG image"));
else
my_toucan = wxBitmap(image);
my_toucan_flipped_horiz = wxBitmap(image.Mirror(true));
my_toucan_flipped_vert = wxBitmap(image.Mirror(false));
my_toucan_flipped_both = wxBitmap(image.Mirror(true).Mirror(false));
my_toucan_grey = wxBitmap(image.ConvertToGreyscale());
my_toucan_head = wxBitmap(image.GetSubImage(wxRect(40, 7, 80, 60)));
my_toucan_scaled_normal = wxBitmap(image.Scale(110,90,wxIMAGE_QUALITY_NORMAL));
my_toucan_scaled_high = wxBitmap(image.Scale(110,90,wxIMAGE_QUALITY_HIGH));
my_toucan_blur = wxBitmap(image.Blur(10));
#endif // wxUSE_LIBPNG
#if wxUSE_LIBJPEG
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.jpg")) )
wxLogError(wxT("Can't load JPG image"));
else
{
my_horse_jpeg = wxBitmap( image );
// Colorize by rotating green hue to red
wxImage::HSVValue greenHSV = wxImage::RGBtoHSV(wxImage::RGBValue(0, 255, 0));
wxImage::HSVValue redHSV = wxImage::RGBtoHSV(wxImage::RGBValue(255, 0, 0));
image.RotateHue(redHSV.hue - greenHSV.hue);
colorized_horse_jpeg = wxBitmap( image );
}
if ( !image.LoadFile( dir + _T("cmyk.jpg")) )
wxLogError(_T("Can't load CMYK JPG image"));
else
my_cmyk_jpeg = wxBitmap(image);
#endif // wxUSE_LIBJPEG
#if wxUSE_GIF
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.gif" )) )
wxLogError(wxT("Can't load GIF image"));
else
my_horse_gif = wxBitmap( image );
#endif
#if wxUSE_PCX
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.pcx"), wxBITMAP_TYPE_PCX ) )
wxLogError(wxT("Can't load PCX image"));
else
my_horse_pcx = wxBitmap( image );
#endif
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.bmp"), wxBITMAP_TYPE_BMP ) )
wxLogError(wxT("Can't load BMP image"));
else
my_horse_bmp = wxBitmap( image );
#if wxUSE_XPM
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.xpm"), wxBITMAP_TYPE_XPM ) )
wxLogError(wxT("Can't load XPM image"));
else
my_horse_xpm = wxBitmap( image );
if ( !image.SaveFile( dir + _T("test.xpm"), wxBITMAP_TYPE_XPM ))
wxLogError(wxT("Can't save file"));
#endif
#if wxUSE_PNM
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.pnm"), wxBITMAP_TYPE_PNM ) )
wxLogError(wxT("Can't load PNM image"));
else
my_horse_pnm = wxBitmap( image );
image.Destroy();
if ( !image.LoadFile( dir + _T("horse_ag.pnm"), wxBITMAP_TYPE_PNM ) )
wxLogError(wxT("Can't load PNM image"));
else
my_horse_asciigrey_pnm = wxBitmap( image );
image.Destroy();
if ( !image.LoadFile( dir + _T("horse_rg.pnm"), wxBITMAP_TYPE_PNM ) )
wxLogError(wxT("Can't load PNM image"));
else
my_horse_rawgrey_pnm = wxBitmap( image );
#endif
#if wxUSE_LIBTIFF
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.tif"), wxBITMAP_TYPE_TIF ) )
wxLogError(wxT("Can't load TIFF image"));
else
my_horse_tiff = wxBitmap( image );
#endif
#if wxUSE_LIBTIFF
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.tga"), wxBITMAP_TYPE_TGA ) )
wxLogError(wxT("Can't load TGA image"));
else
my_horse_tga = wxBitmap( image );
#endif
CreateAntiAliasedBitmap();
my_smile_xbm = wxBitmap( (const char*)smile_bits, smile_width,
smile_height, 1 );
// demonstrates XPM automatically using the mask when saving
if ( m_bmpSmileXpm.Ok() )
m_bmpSmileXpm.SaveFile(_T("saved.xpm"), wxBITMAP_TYPE_XPM);
#if wxUSE_ICO_CUR
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.ico"), wxBITMAP_TYPE_ICO, 0 ) )
wxLogError(wxT("Can't load first ICO image"));
else
my_horse_ico32 = wxBitmap( image );
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.ico"), wxBITMAP_TYPE_ICO, 1 ) )
wxLogError(wxT("Can't load second ICO image"));
else
my_horse_ico16 = wxBitmap( image );
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.ico") ) )
wxLogError(wxT("Can't load best ICO image"));
else
my_horse_ico = wxBitmap( image );
image.Destroy();
if ( !image.LoadFile( dir + _T("horse.cur"), wxBITMAP_TYPE_CUR ) )
wxLogError(wxT("Can't load best ICO image"));
else
{
my_horse_cur = wxBitmap( image );
xH = 30 + image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X) ;
yH = 2420 + image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y) ;
}
m_ani_images = wxImage::GetImageCount ( dir + _T("horse3.ani"), wxBITMAP_TYPE_ANI );
if (m_ani_images==0)
wxLogError(wxT("No ANI-format images found"));
else
my_horse_ani = new wxBitmap [m_ani_images];
int i;
for (i=0; i < m_ani_images; i++)
{
image.Destroy();
if (!image.LoadFile( dir + _T("horse3.ani"), wxBITMAP_TYPE_ANI, i ))
{
wxString tmp = wxT("Can't load image number ");
tmp << i ;
wxLogError(tmp);
}
else
my_horse_ani [i] = wxBitmap( image );
}
#endif // wxUSE_ICO_CUR
image.Destroy();
// test image loading from stream
wxFile file(dir + _T("horse.bmp"));
if ( file.IsOpened() )
{
wxFileOffset len = file.Length();
size_t dataSize = (size_t)len;
void *data = malloc(dataSize);
if ( file.Read(data, dataSize) != len )
wxLogError(_T("Reading bitmap file failed"));
else
{
wxMemoryInputStream mis(data, dataSize);
if ( !image.LoadFile(mis) )
wxLogError(wxT("Can't load BMP image from stream"));
else
my_horse_bmp2 = wxBitmap( image );
}
free(data);
}
}
MyCanvas::~MyCanvas()
{
delete [] my_horse_ani;
}
void MyCanvas::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
wxPaintDC dc( this );
PrepareDC( dc );
dc.DrawText( _T("Loaded image"), 30, 10 );
if (my_square.Ok())
dc.DrawBitmap( my_square, 30, 30 );
dc.DrawText( _T("Drawn directly"), 150, 10 );
dc.SetBrush( wxBrush( wxT("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.Ok())
dc.DrawBitmap( my_anti, 280, 30 );
dc.DrawText( _T("PNG handler"), 30, 135 );
if (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( _T("GetSubBitmap()"), 280, 175 );
dc.DrawBitmap( sub, 280, 195 );
}
dc.DrawText( _T("JPEG handler"), 30, 365 );
if (my_horse_jpeg.Ok())
dc.DrawBitmap( my_horse_jpeg, 30, 380 );
dc.DrawText( _T("Green rotated to red"), 280, 365 );
if (colorized_horse_jpeg.Ok())
dc.DrawBitmap( colorized_horse_jpeg, 280, 380 );
dc.DrawText( _T("CMYK JPEG image"), 530, 365 );
if (my_cmyk_jpeg.Ok())
dc.DrawBitmap( my_cmyk_jpeg, 530, 380 );
dc.DrawText( _T("GIF handler"), 30, 595 );
if (my_horse_gif.Ok())
dc.DrawBitmap( my_horse_gif, 30, 610 );
dc.DrawText( _T("PCX handler"), 30, 825 );
if (my_horse_pcx.Ok())
dc.DrawBitmap( my_horse_pcx, 30, 840 );
dc.DrawText( _T("BMP handler"), 30, 1055 );
if (my_horse_bmp.Ok())
dc.DrawBitmap( my_horse_bmp, 30, 1070 );
dc.DrawText( _T("BMP read from memory"), 280, 1055 );
if (my_horse_bmp2.Ok())
dc.DrawBitmap( my_horse_bmp2, 280, 1070 );
dc.DrawText( _T("PNM handler"), 30, 1285 );
if (my_horse_pnm.Ok())
dc.DrawBitmap( my_horse_pnm, 30, 1300 );
dc.DrawText( _T("PNM handler (ascii grey)"), 280, 1285 );
if (my_horse_asciigrey_pnm.Ok())
dc.DrawBitmap( my_horse_asciigrey_pnm, 280, 1300 );
dc.DrawText( _T("PNM handler (raw grey)"), 530, 1285 );
if (my_horse_rawgrey_pnm.Ok())
dc.DrawBitmap( my_horse_rawgrey_pnm, 530, 1300 );
dc.DrawText( _T("TIFF handler"), 30, 1515 );
if (my_horse_tiff.Ok())
dc.DrawBitmap( my_horse_tiff, 30, 1530 );
dc.DrawText( _T("TGA handler"), 30, 1745 );
if (my_horse_tga.Ok())
dc.DrawBitmap( my_horse_tga, 30, 1760 );
dc.DrawText( _T("XPM handler"), 30, 1975 );
if (my_horse_xpm.Ok())
dc.DrawBitmap( my_horse_xpm, 30, 2000 );
// toucans
{
int x = 750, y = 10, yy = 170;
dc.DrawText(wxT("Original toucan"), x+50, y);
dc.DrawBitmap(my_toucan, x, y+15, true);
y += yy;
dc.DrawText(wxT("Flipped horizontally"), x+50, y);
dc.DrawBitmap(my_toucan_flipped_horiz, x, y+15, true);
y += yy;
dc.DrawText(wxT("Flipped vertically"), x+50, y);
dc.DrawBitmap(my_toucan_flipped_vert, x, y+15, true);
y += yy;
dc.DrawText(wxT("Flipped both h&v"), x+50, y);
dc.DrawBitmap(my_toucan_flipped_both, x, y+15, true);
y += yy;
dc.DrawText(wxT("In greyscale"), x+50, y);
dc.DrawBitmap(my_toucan_grey, x, y+15, true);
y += yy;
dc.DrawText(wxT("Toucan's head"), x+50, y);
dc.DrawBitmap(my_toucan_head, x, y+15, true);
y += yy;
dc.DrawText(wxT("Scaled with normal quality"), x+50, y);
dc.DrawBitmap(my_toucan_scaled_normal, x, y+15, true);
y += yy;
dc.DrawText(wxT("Scaled with high quality"), x+50, y);
dc.DrawBitmap(my_toucan_scaled_high, x, y+15, true);
y += yy;
dc.DrawText(wxT("Blured"), x+50, y);
dc.DrawBitmap(my_toucan_blur, x, y+15, true);
}
if (my_smile_xbm.Ok())
{
int x = 300, y = 1800;
dc.DrawText( _T("XBM bitmap"), x, y );
dc.DrawText( _T("(green on red)"), x, y + 15 );
dc.SetTextForeground( _T("GREEN") );
dc.SetTextBackground( _T("RED") );
dc.DrawBitmap( my_smile_xbm, x, y + 30 );
dc.SetTextForeground( *wxBLACK );
dc.DrawText( _T("After wxImage conversion"), x + 120, y );
dc.DrawText( _T("(red on white)"), x + 120, y + 15 );
dc.SetTextForeground( wxT("RED") );
wxImage i = my_smile_xbm.ConvertToImage();
i.SetMaskColour( 255, 255, 255 );
i.Replace( 0, 0, 0,
wxRED_PEN->GetColour().Red(),
wxRED_PEN->GetColour().Green(),
wxRED_PEN->GetColour().Blue() );
dc.DrawBitmap( wxBitmap(i), x + 120, y + 30, true );
dc.SetTextForeground( *wxBLACK );
}
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 );
#ifndef __WXGTK20__
// I cannot convince GTK2 to draw into mono bitmaps
memdc.DrawText( _T("Hi!"), 5, 5 );
#endif
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())
{
int x = 300, y = 1900;
dc.DrawText( _T("Mono bitmap"), x, y );
dc.DrawText( _T("(red on green)"), x, y + 15 );
dc.SetTextForeground( wxT("RED") );
dc.SetTextBackground( wxT("GREEN") );
dc.DrawBitmap( mono, x, y + 30 );
dc.SetTextForeground( *wxBLACK );
dc.DrawText( _T("After wxImage conversion"), x + 120, y );
dc.DrawText( _T("(red on white)"), x + 120, y + 15 );
dc.SetTextForeground( wxT("RED") );
wxImage i = mono.ConvertToImage();
i.SetMaskColour( 255,255,255 );
i.Replace( 0,0,0,
wxRED_PEN->GetColour().Red(),
wxRED_PEN->GetColour().Green(),
wxRED_PEN->GetColour().Blue() );
dc.DrawBitmap( wxBitmap(i), x + 120, y + 30, true );
dc.SetTextForeground( *wxBLACK );
}
// For testing transparency
dc.SetBrush( *wxRED_BRUSH );
dc.DrawRectangle( 20, 2220, 560, 68 );
dc.DrawText(_T("XPM bitmap"), 30, 2230 );
if ( m_bmpSmileXpm.Ok() )
dc.DrawBitmap(m_bmpSmileXpm, 30, 2250, true);
dc.DrawText(_T("XPM icon"), 110, 2230 );
if ( m_iconSmileXpm.Ok() )
dc.DrawIcon(m_iconSmileXpm, 110, 2250);
// testing icon -> bitmap conversion
wxBitmap to_blit( m_iconSmileXpm );
if (to_blit.Ok())
{
dc.DrawText( _T("SubBitmap"), 170, 2230 );
wxBitmap sub = to_blit.GetSubBitmap( wxRect(0,0,15,15) );
if (sub.Ok())
dc.DrawBitmap( sub, 170, 2250, true );
dc.DrawText( _T("Enlarged"), 250, 2230 );
dc.SetUserScale( 1.5, 1.5 );
dc.DrawBitmap( to_blit, (int)(250/1.5), (int)(2250/1.5), true );
dc.SetUserScale( 2, 2 );
dc.DrawBitmap( to_blit, (int)(300/2), (int)(2250/2), true );
dc.SetUserScale( 1.0, 1.0 );
dc.DrawText( _T("Blit"), 400, 2230);
wxMemoryDC blit_dc;
blit_dc.SelectObject( to_blit );
dc.Blit( 400, 2250, to_blit.GetWidth(), to_blit.GetHeight(), &blit_dc, 0, 0, wxCOPY, true );
dc.SetUserScale( 1.5, 1.5 );
dc.Blit( (int)(450/1.5), (int)(2250/1.5), to_blit.GetWidth(), to_blit.GetHeight(), &blit_dc, 0, 0, wxCOPY, true );
dc.SetUserScale( 2, 2 );
dc.Blit( (int)(500/2), (int)(2250/2), to_blit.GetWidth(), to_blit.GetHeight(), &blit_dc, 0, 0, wxCOPY, true );
dc.SetUserScale( 1.0, 1.0 );
}
dc.DrawText( _T("ICO handler (1st image)"), 30, 2290 );
if (my_horse_ico32.Ok())
dc.DrawBitmap( my_horse_ico32, 30, 2330, true );
dc.DrawText( _T("ICO handler (2nd image)"), 230, 2290 );
if (my_horse_ico16.Ok())
dc.DrawBitmap( my_horse_ico16, 230, 2330, true );
dc.DrawText( _T("ICO handler (best image)"), 430, 2290 );
if (my_horse_ico.Ok())
dc.DrawBitmap( my_horse_ico, 430, 2330, true );
dc.DrawText( _T("CUR handler"), 30, 2390 );
if (my_horse_cur.Ok())
{
dc.DrawBitmap( my_horse_cur, 30, 2420, true );
dc.SetPen (*wxRED_PEN);
dc.DrawLine (xH-10,yH,xH+10,yH);
dc.DrawLine (xH,yH-10,xH,yH+10);
}
dc.DrawText( _T("ANI handler"), 230, 2390 );
for ( int i=0; i < m_ani_images; i++ )
{
if (my_horse_ani[i].Ok())
{
dc.DrawBitmap( my_horse_ani[i], 230 + i * 2 * my_horse_ani[i].GetWidth() , 2420, true );
}
}
}
void MyCanvas::CreateAntiAliasedBitmap()
{
wxBitmap bitmap( 300, 300 );
wxMemoryDC dc;
dc.SelectObject( bitmap );
dc.Clear();
dc.SetFont( wxFont( 24, wxDECORATIVE, wxNORMAL, wxNORMAL) );
dc.SetTextForeground( wxT("RED") );
dc.DrawText( _T("This is anti-aliased Text."), 20, 5 );
dc.DrawText( _T("And a Rectangle."), 20, 45 );
dc.SetBrush( *wxRED_BRUSH );
dc.SetPen( *wxTRANSPARENT_PEN );
dc.DrawRoundedRectangle( 20, 85, 200, 180, 20 );
wxImage original= bitmap.ConvertToImage();
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, (unsigned char)red, (unsigned char)green, (unsigned char)blue );
}
my_anti = wxBitmap(anti);
}
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