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/*
* $Id: transferRGBFunctionBox.cxx,v 4.0 2003/04/28 14:40:17 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 "transferBox.hxx"
#include "transferRGBFunction.hxx"
#include "transferRGBFunctionBox.hxx"
extern imageIO *IOBlackBox;
extern imageViewer *mainViewer;
extern transferRGB *transferRGBEditorPanel;
void myTransferRGBFunctionBox::draw()
{
int startX, startY, endX, endY, inc;
double x0[3], y0[3], x1[3], y1[3], swapd; // these are normally between 0 and 1
int w0, h0;
int xa, ya, xb, yb;
// call the superclass' draw routine.
myTransferRGBBox::draw();
computeRGBEndPoints(x0, y0, x1, y1); // this returns the End points.
fl_push_no_clip();
//fl_clip(x(),y(),w(),h());
for (int i = 0 ; i < 3 ; ++i) {
//fl_clip(x(),y(),w(),h());
switch (i) {
case 0:
fl_color(FL_RED);
break;
case 1:
fl_color(FL_GREEN);
break;
case 2:
fl_color(FL_BLUE);
break;
}
inc = 1;
if (x0[i] > x1[i] || y0[i] > y1[i]) { // negative contrast
swapd = x1[i];
x1[i] = x0[i];
x0[i] = swapd;
if (y0[i] > 1) {
startX = (int)(x0[i]*(w()-1));
startY = 0;
} else {
startX = 0;
startY = (int)((h()-1)*(1-y0[i]));
}
if (y1[i] > 0) {
endX = w()-1;
endY = (int)((h()-1)*(1-y1[i]));
} else {
endX = (int)(x1[i]*(w()-1));
endY = h()-1;
}
dbgprintf("Start: (%d, %d) ; end: (%d, %d)\n",
startX, startY, endX, endY);
w0 = endX - startX;
h0 = startY - endY; // h is inverted...
xa = 0;
ya = 0;
if (w0 != 0) {
for (xb = startX; xb <= endX ; xb += inc) {
//yb = startY - (xb-startX)*h0/w0;
yb = (int)(startY - h0*pow(((double)xb-startX)/w0,1/getCurrGamma(i)));
fl_line(xa+x(), ya+y(), xb+x(),yb+y());
xa = xb;
ya = yb;
}
} else {
fl_line(x(), y()+h()-1, startX+x(), y()+h()-1);
fl_line(startX+x(), startY+y(), endX+x(), endY+y());
xa = endX;
ya = endY;
}
// finish the path
fl_line(xa+x(), ya+y(), w()-1+x(), y()+h()-1);
} else {
if (y0[i] < 0) {
startX = (int)(x0[i]*(w()-1));
startY = h()-1;
} else {
startX = 0;
startY = (int)((h()-1)*(1-y0[i]));
}
if (y1[i] <= 1) {
endX = w()-1;
endY = (int)((h()-1)*(1-y1[i]));
} else {
endX = (int)(x1[i]*(w()-1));
endY = 0;
}
dbgprintf("Start: (%d, %d) ; end: (%d, %d)\n",
startX, startY, endX, endY);
w0 = endX - startX;
h0 = startY - endY; // h is inverted...
xa = 0;
ya = h()-1;
if (w0 != 0) {
for (xb = startX; xb <= endX ; xb += inc) {
//yb = startY - (xb-startX)*h0/w0;
yb = (int)(startY - h0*pow(((double)xb-startX)/w0,1/getCurrGamma(i)));
fl_line(xa+x(), ya+y(), xb+x(),yb+y());
xa = xb;
ya = yb;
}
} else {
fl_line(x(), y()+h()-1, startX+x(), y()+h()-1);
fl_line(startX+x(), startY+y(), endX+x(), endY+y());
xa = endX;
ya = endY;
}
// finish the path
fl_line(xa+x(), ya+y(), w()-1+x(), y());
}
}
fl_pop_clip();
return;
}
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