?? fl_valuator.cxx
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//// "$Id: Fl_Valuator.cxx,v 1.1.1.1 2003/08/07 21:18:40 jasonk Exp $"//// Valuator widget for the Fast Light Tool Kit (FLTK).//// Copyright 1998-1999 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@easysw.com".//// Base class for sliders and all other one-value "knobs"#include <FL/Fl.H>#include <FL/Fl_Valuator.H>#include <FL/math.h>#include <stdio.h>Fl_Valuator::Fl_Valuator(int X, int Y, int W, int H, const char* L) : Fl_Widget(X,Y,W,H,L) { align(FL_ALIGN_BOTTOM); when(FL_WHEN_CHANGED); value_ = 0; min = 0; max = 1; A = 0.0; B = 1;}const double epsilon = 1e-12 ;void Fl_Valuator::step(double s) { if (s < 0) s = -s; A = rint(s); B = 1; while (fabs(s-A/B) > epsilon) {B *= 10; A = rint(s*B);}}void Fl_Valuator::precision(int p) { A = 1.0; for (B = 1; p--;) B *= 10;}void Fl_Valuator::value_damage() {damage(FL_DAMAGE_EXPOSE);} // by default do partial-redrawint Fl_Valuator::value(double v) { clear_changed(); if (v == value_) return 0; value_ = v; value_damage(); return 1;}double Fl_Valuator::softclamp(double v) { int which = (min<=max); double p = previous_value_; if ((v<min)==which && p!=min && (p<min)!=which) return min; else if ((v>max)==which && p!=max && (p>max)!=which) return max; else return v;}// inline void Fl_Valuator::handle_push() {previous_value_ = value_;}void Fl_Valuator::handle_drag(double v) { if (v != value_) { value_ = v; value_damage(); if (when() & FL_WHEN_CHANGED) do_callback(); else set_changed(); }}void Fl_Valuator::handle_release() { if (when()&FL_WHEN_RELEASE) { // insure changed() is off even if no callback is done. It may have // been turned on by the drag, and then the slider returned to it's // initial position: clear_changed(); // now do the callback only if slider in new position or always is on: if (value_ != previous_value_ || when() & FL_WHEN_NOT_CHANGED) do_callback(); }}double Fl_Valuator::round(double v) { if (A) return rint(v*B/A)*A/B; else return v;}double Fl_Valuator::clamp(double v) { if ((v<min)==(min<=max)) return min; else if ((v>max)==(min<=max)) return max; else return v;}double Fl_Valuator::increment(double v, int n) { if (!A) return v+n*(max-min)/100; if (min > max) n = -n; return (rint(v*B/A)+n)*A/B;}int Fl_Valuator::format(char* buffer) { double v = value(); if (!A || B==1) return sprintf(buffer, "%g", v); int i, x; for (x = 10, i = 2; x < B; x *= 10) i++; if (x == B) i--; return sprintf(buffer, "%.*f", i, v);}//// End of "$Id: Fl_Valuator.cxx,v 1.1.1.1 2003/08/07 21:18:40 jasonk Exp $".//
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