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//
// "$Id$"
//
// Circular dial widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2005 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/Fl_Dial.H>
#include <FL/fl_draw.H>
#include <stdlib.h>
#include <FL/math.h>
// All angles are measured with 0 to the right and counter-clockwise
void Fl_Dial::draw(int X, int Y, int W, int H) {
if (damage()&FL_DAMAGE_ALL) draw_box(box(), X, Y, W, H, color());
X += Fl::box_dx(box());
Y += Fl::box_dy(box());
W -= Fl::box_dw(box());
H -= Fl::box_dh(box());
double angle = (a2-a1)*(value()-minimum())/(maximum()-minimum()) + a1;
if (type() == FL_FILL_DIAL) {
// foo: draw this nicely in certain round box types
int foo = (box() > _FL_ROUND_UP_BOX && Fl::box_dx(box()));
if (foo) {X--; Y--; W+=2; H+=2;}
fl_color(color());
fl_pie(X, Y, W-1, H-1, 270-a1, angle > a1 ? 360+270-angle : 270-360-angle);
fl_color(selection_color());
fl_pie(X, Y, W-1, H-1, 270-angle, 270-a1);
if (foo) {
fl_color(FL_FOREGROUND_COLOR);
fl_arc(X, Y, W, H, 0, 360);
}
return;
}
if (!(damage()&FL_DAMAGE_ALL)) {
fl_color(color());
fl_pie(X+1, Y+1, W-2, H-2, 0, 360);
}
fl_push_matrix();
fl_translate(X+W/2-.5, Y+H/2-.5);
fl_scale(W-1, H-1);
fl_rotate(45-angle);
fl_color(selection_color());
if (type()) { // FL_LINE_DIAL
fl_begin_polygon();
fl_vertex(0.0, 0.0);
fl_vertex(-0.04, 0.0);
fl_vertex(-0.25, 0.25);
fl_vertex(0.0, 0.04);
fl_end_polygon();
fl_color(FL_FOREGROUND_COLOR);
fl_begin_loop();
fl_vertex(0.0, 0.0);
fl_vertex(-0.04, 0.0);
fl_vertex(-0.25, 0.25);
fl_vertex(0.0, 0.04);
fl_end_loop();
} else {
fl_begin_polygon(); fl_circle(-0.20, 0.20, 0.07); fl_end_polygon();
fl_color(FL_FOREGROUND_COLOR);
fl_begin_loop(); fl_circle(-0.20, 0.20, 0.07); fl_end_loop();
}
fl_pop_matrix();
}
void Fl_Dial::draw() {
draw(x(), y(), w(), h());
draw_label();
}
int Fl_Dial::handle(int event, int X, int Y, int W, int H) {
switch (event) {
case FL_PUSH:
handle_push();
case FL_DRAG: {
int mx = (Fl::event_x()-X-W/2)*H;
int my = (Fl::event_y()-Y-H/2)*W;
if (!mx && !my) return 1;
double angle = 270-atan2((float)-my, (float)mx)*180/M_PI;
double oldangle = (a2-a1)*(value()-minimum())/(maximum()-minimum()) + a1;
while (angle < oldangle-180) angle += 360;
while (angle > oldangle+180) angle -= 360;
double val;
if ((a1<a2) ? (angle <= a1) : (angle >= a1)) {
val = minimum();
} else if ((a1<a2) ? (angle >= a2) : (angle <= a2)) {
val = maximum();
} else {
val = minimum() + (maximum()-minimum())*(angle-a1)/(a2-a1);
}
handle_drag(clamp(round(val)));
} return 1;
case FL_RELEASE:
handle_release();
return 1;
case FL_ENTER :
case FL_LEAVE :
return 1;
default:
return 0;
}
}
int Fl_Dial::handle(int e) {
return handle(e, x(), y(), w(), h());
}
Fl_Dial::Fl_Dial(int X, int Y, int W, int H, const char* l)
: Fl_Valuator(X, Y, W, H, l) {
box(FL_OVAL_BOX);
selection_color(FL_INACTIVE_COLOR); // was 37
a1 = 45;
a2 = 315;
}
//
// End of "$Id$".
//
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