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/*
* $Id: transferHistoBox.cxx,v 4.0 2003/04/28 14:40:14 hut66au Exp $
*
* Imview, the portable image analysis application
* http://www.cmis.csiro.au/Hugues.Talbot/imview
* ----------------------------------------------------------
*
* Imview is an attempt to provide an image display application
* suitable for professional image analysis. It was started in
* 1997 and is mostly the result of the efforts of Hugues Talbot,
* Image Analysis Project, CSIRO Mathematical and Information
* Sciences, with help from others (see the CREDITS files for
* more information)
*
* Imview is Copyrighted (C) 1997-2001 by Hugues Talbot and was
* supported in parts by the Australian Commonwealth Science and
* Industry Research Organisation. Please see the COPYRIGHT file
* for full details. Imview also includes the contributions of
* many others. Please see the CREDITS file for full details.
*
* 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, USA.
* */
/*------------------------------------------------------------------------
*
* A subclass of Box for drawing transfer functions
*
* Hugues Talbot 3 May 1998
*
*-----------------------------------------------------------------------*/
#include <math.h>
#include "imview.hxx"
#include "imageIO.hxx"
#include "imageViewer.hxx"
#include "transferFunction.hxx"
#include "transferBox.hxx"
#include "transferHistoBox.hxx"
extern imageIO *IOBlackBox;
extern imageViewer *mainViewer;
extern transfer *transferEditorPanel;
void myTransferHistoBox::makeHisto()
{
int i, spp, val;
long nbpix;
unsigned char *p, *end;
for (i = 0 ; i < 256 ; i++)
theHisto[i] = 0;
nbpix = IOBlackBox->imageWidth() * IOBlackBox->imageHeight();
spp = IOBlackBox->imageDepth();
if (spp == 1) {
p = IOBlackBox->imageData();
end = p + nbpix;
while (p != end) {
theHisto[*p++]++; // simple.
}
} else if (spp == 3) {
// we need to be a bit more conservative with colour
p = IOBlackBox->imageData();
end = p + spp * nbpix;
while (p != end) {
val = *p++;
val += *p++;
val += *p++;
theHisto[val/3]++; // simple as well.
}
}
maxval = 0;
for (i = 0 ; i < 256 ; i++)
if (theHisto[i] > maxval)
maxval= theHisto[i];
return;
}
void myTransferHistoBox::draw()
{
double x0, y0, x1, y1;
int xx;
// call the superclass' draw routine
myTransferBox::draw();
x0 = y0 = x1 = y1 = 0.0;
computeEndPoints(x0, y0, x1, y1); // this fills the x?,y?
fl_clip(x(),y(),w(),h());
fl_color(FL_BLACK);
for (int i = 0 ; i < w() ; i++) {
xx = (int)((double)i * 256 / w());
fl_line(x()+i, y()+h()-1, x()+i, y()+h()-(int)((double)theHisto[xx]*h()/maxval));
}
fl_pop_clip();
return;
}
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