home *** CD-ROM | disk | FTP | other *** search
- //
- // "$Id: Fl_Roller.cxx,v 1.6.2.1 1999/09/15 16:07:03 mike Exp $"
- //
- // Roller 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".
- //
-
- // Rapid-App style knob
-
- #include <FL/Fl.H>
- #include <FL/Fl_Roller.H>
- #include <FL/fl_draw.H>
- #include <math.h>
-
- int Fl_Roller::handle(int event) {
- static int ipos;
- int newpos = horizontal() ? Fl::event_x() : Fl::event_y();
- switch (event) {
- case FL_PUSH:
- handle_push();
- ipos = newpos;
- return 1;
- case FL_DRAG:
- handle_drag(clamp(round(increment(previous_value(),newpos-ipos))));
- return 1;
- case FL_RELEASE:
- handle_release();
- return 1;
- default:
- return 0;
- }
- }
-
- void Fl_Roller::draw() {
- if (damage()&FL_DAMAGE_ALL) draw_box();
- int X = x()+Fl::box_dx(box());
- int Y = y()+Fl::box_dy(box());
- int W = w()-Fl::box_dw(box())-1;
- int H = h()-Fl::box_dh(box())-1;
- if (W<=0 || H <=0) return;
- int offset = step() ? int(value()/step()) : 0;
- const double ARC = 1.5; // 1/2 the number of radians visible
- const double delta = .2; // radians per knurl
- if (horizontal()) { // horizontal one
- // draw shaded ends of wheel:
- int h1 = W/4+1; // distance from end that shading starts
- fl_color(color()); fl_rectf(X+h1,Y,W-2*h1,H);
- for (int i=0; h1; i++) {
- fl_color((Fl_Color)(FL_GRAY-i-1));
- int h2 = FL_GRAY-i-1 > FL_DARK3 ? 2*h1/3+1 : 0;
- fl_rectf(X+h2,Y,h1-h2,H);
- fl_rectf(X+W-h1,Y,h1-h2,H);
- h1 = h2;
- }
- if (active_r()) {
- // draw ridges:
- double junk;
- for (double y = -ARC+modf(offset*sin(ARC)/(W/2)/delta,&junk)*delta;;
- y += delta) {
- int y1 = int((sin(y)/sin(ARC)+1)*W/2);
- if (y1 <= 0) continue; else if (y1 >= W-1) break;
- fl_color(FL_DARK3); fl_yxline(X+y1,Y+1,Y+H-1);
- if (y < 0) y1--; else y1++;
- fl_color(FL_LIGHT1);fl_yxline(X+y1,Y+1,Y+H-1);
- }
- // draw edges:
- h1 = W/8+1; // distance from end the color inverts
- fl_color(FL_DARK2);
- fl_xyline(X+h1,Y+H-1,X+W-h1);
- fl_color(FL_DARK3);
- fl_yxline(X,Y+H,Y,X+h1);
- fl_xyline(X+W-h1,Y,X+W);
- fl_color(FL_LIGHT2);
- fl_xyline(X+h1,Y-1,X+W-h1);
- fl_yxline(X+W,Y,Y+H,X+W-h1);
- fl_xyline(X+h1,Y+H,X);
- }
- } else { // vertical one
- // draw shaded ends of wheel:
- int h1 = H/4+1; // distance from end that shading starts
- fl_color(color()); fl_rectf(X,Y+h1,W,H-2*h1);
- for (int i=0; h1; i++) {
- fl_color((Fl_Color)(FL_GRAY-i-1));
- int h2 = FL_GRAY-i-1 > FL_DARK3 ? 2*h1/3+1 : 0;
- fl_rectf(X,Y+h2,W,h1-h2);
- fl_rectf(X,Y+H-h1,W,h1-h2);
- h1 = h2;
- }
- if (active_r()) {
- // draw ridges:
- double junk;
- for (double y = -ARC+modf(offset*sin(ARC)/(H/2)/delta,&junk)*delta;
- ; y += delta) {
- int y1 = int((sin(y)/sin(ARC)+1)*H/2);
- if (y1 <= 0) continue; else if (y1 >= H-1) break;
- fl_color(FL_DARK3); fl_xyline(X+1,Y+y1,X+W-1);
- if (y < 0) y1--; else y1++;
- fl_color(FL_LIGHT1);fl_xyline(X+1,Y+y1,X+W-1);
- }
- // draw edges:
- h1 = H/8+1; // distance from end the color inverts
- fl_color(FL_DARK2);
- fl_yxline(X+W-1,Y+h1,Y+H-h1);
- fl_color(FL_DARK3);
- fl_xyline(X+W,Y,X,Y+h1);
- fl_yxline(X,Y+H-h1,Y+H);
- fl_color(FL_LIGHT2);
- fl_yxline(X,Y+h1,Y+H-h1);
- fl_xyline(X,Y+H,X+W,Y+H-h1);
- fl_yxline(X+W,Y+h1,Y);
- }
- }
- }
-
- Fl_Roller::Fl_Roller(int X,int Y,int W,int H,const char* L)
- : Fl_Valuator(X,Y,W,H,L) {
- box(FL_UP_FRAME);
- step(1,1000);
- }
-
- //
- // End of "$Id: Fl_Roller.cxx,v 1.6.2.1 1999/09/15 16:07:03 mike Exp $".
- //
-