display_canvas.cpp

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/*
 *  Copyright (C) Massimo Cora' 2006 <maxcvs@gmail.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "display_canvas.h"


// implement message map
BEGIN_EVENT_TABLE(DisplayCanvas, wxWindow)
  EVT_PAINT( DisplayCanvas::OnPaint )
END_EVENT_TABLE()



DisplayCanvas::DisplayCanvas( wxWindow *frame, const wxSize& size ):
                        wxWindow(frame, -1, wxDefaultPosition, size, wxSIMPLE_BORDER )
{
        _new_image_available = false;
        _drawing = false;

        _canvas_width = size.GetWidth ();
        _canvas_height = size.GetHeight ();
}

DisplayCanvas::~DisplayCanvas( )
{

}


void DisplayCanvas::OnPaint(wxPaintEvent& event)
{
        wxPaintDC dc(this);
        Draw( dc );
}

void DisplayCanvas::DrawIplImage( IplImage* ipl_image )
{
        if( _drawing == true ) 
                return;

        if ( ipl_image->width != _canvas_width || ipl_image->height != _canvas_height )
                return;

        _drawing = true;

        unsigned char *raw_data;
        CvSize roiSize;
        int step = 0;
        
        cvGetRawData( ipl_image, &raw_data, &step, &roiSize );

        // the data is static, i.e. it DOES NOT HAVE TO BE RELEASED by wxImage when destroyed.
        wxImage pWxImg = wxImage( ipl_image->width, ipl_image->height, raw_data, true );
        _new_wxbitmap = wxBitmap( pWxImg );

        _new_image_available = true;
        //cvReleaseImage( &ipl_image );
        _drawing = false;

        // yeah, here it is. Refresh the canvas!
        Refresh( FALSE );
}

void DisplayCanvas::Draw( wxDC& dc )
{
        // check if dc available
        if( !dc.Ok() ){ 
                return; 
        }

        _drawing = true;

        int x,y,w,h;
        dc.GetClippingBox( &x, &y, &w, &h );
        // if there is a new image to draw
        if( _new_image_available == true )
        {
                dc.DrawBitmap( _new_wxbitmap, x, y );
                _new_image_available = false;
        } else
        {
                // draw inter frame ?
        }

        _drawing = false;

        return;
}

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