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//
// "$Id$"
//
// Value slider widget for the Fast Light Tool Kit (FLTK).
// -- adapted (slevy@ncsa.uiuc.edu) for log scaling
// Copyright 1998-2000 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org".
//
#include <FL/Fl.H>
#include "Fl_Log_Slider.H"
#include <FL/fl_draw.H>
#include <stdio.h>
#include <math.h>
Fl_Log_Slider::Fl_Log_Slider(int x,int y,int w,int h, const char*l)
: Fl_Slider(x,y,w,h,l) {
step(0,100);
textfont_ = FL_HELVETICA;
textsize_ = 10;
textcolor_ = FL_BLACK;
style_ = FL_LOG_LINEAR;
textwidth_ = 45;
}
int Fl_Log_Slider::format(char *buf) {
if(style_ == FL_LINEAR_LINEAR || style_ == FL_LOG_LINEAR)
}
double Fl_Log_Slider::truevalue() {
if(style_ == FL_LINEAR_LINEAR)
return value();
double smin = minimum();
if(truemin_ == 0) {
truemin_ = (truemax_ == 0) ? 0.1 : 0.1 * truemax_;
}
if(truemax_ == 0) truemax_ = 100 * truemin_;
double lograt = log(fabs(truemax_ / truemin_));
return truemin_ * exp(lograt *
fabs( (value() - smin) / (maximum() - smin) ) );
}
void Fl_Log_Slider::truevalue( double v ) {
if(style_ == FL_LINEAR_LINEAR) {
value(v);
return;
}
if(truemin_ == 0) {
truemin_ = (truemax_ == 0) ? 0.1 : 0.1 * truemax_;
}
if(truemax_ == 0) truemax_ = 100 * truemin_;
double lograt = log(fabs(truemax_ / truemin_));
double w = v / truemin_;
if(w > 0) w = log(w) / lograt;
value( minimum() + w * (maximum() - minimum()) );
}
double Fl_Log_Slider::printvalue( double truev ) {
switch(style_) {
case FL_LOG_LOG:
case FL_LOG_LINEAR:
return truev==0 ? -10 : log10( fabs(truev) );
default:
case FL_LINEAR_LINEAR:
return truev;
}
}
void Fl_Log_Slider::draw() {
int sxx = x(), syy = y(), sww = w(), shh = h();
int bxx = x(), byy = y(), bww = w(), bhh = h();
if (horizontal()) {
bww = textwidth_; sxx += textwidth_; sww -= textwidth_;
} else {
syy += 25; bhh = 25; shh -= 25;
}
if (damage()&FL_DAMAGE_ALL) draw_box(box(),sxx,syy,sww,shh,color());
if(truedirt_) {
minimum( printvalue(truemin()) );
maximum( printvalue(truemax()) );
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truedirt_ = 0;
}
Fl_Slider::draw(sxx+Fl::box_dx(box()),
syy+Fl::box_dy(box()),
sww-Fl::box_dw(box()),
shh-Fl::box_dh(box()));
draw_box(box(),bxx,byy,bww,bhh,color());
char buf[128];
format(buf);
fl_font(textfont(), textsize());
fl_color(active_r() ? textcolor() : inactive(textcolor()));
fl_draw(buf, bxx, byy, bww, bhh, FL_ALIGN_CLIP);
}
int Fl_Log_Slider::handle(int event) {
int sxx = x(), syy = y(), sww = w(), shh = h();
if (horizontal()) {
sxx += textwidth_; sww -= textwidth_;
} else {
syy += 25; shh -= 25;
}
return Fl_Slider::handle(event,
sxx+Fl::box_dx(box()),
syy+Fl::box_dy(box()),
sww-Fl::box_dw(box()),
shh-Fl::box_dh(box()));
}
//
// End of "$Id$".
//