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- //
- // "$Id: Fl_Dial.cxx,v 1.12 1999/03/10 08:17:42 bill Exp $"
- //
- // Circular dial 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".
- //
-
- #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_BLACK);
- 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_BLACK);
- 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_BLACK);
- 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;
- int my = Fl::event_y()-y-h/2;
- 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;
- 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: Fl_Dial.cxx,v 1.12 1999/03/10 08:17:42 bill Exp $".
- //
-