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//
// "$Id: Fl_Roller.cxx,v 1.6.2.4.2.6 2002/05/24 14:19:19 easysw Exp $"
//
// Roller widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2002 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".
//
// 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:
if (Fl::visible_focus()) Fl::focus(this);
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;
case FL_KEYBOARD :
switch (Fl::event_key()) {
case FL_Up:
if (horizontal()) return 0;
handle_drag(clamp(increment(value(),-1)));
return 1;
case FL_Down:
if (horizontal()) return 0;
handle_drag(clamp(increment(value(),1)));
return 1;
case FL_Left:
if (!horizontal()) return 0;
handle_drag(clamp(increment(value(),-1)));
return 1;
case FL_Right:
if (!horizontal()) return 0;
handle_drag(clamp(increment(value(),1)));
return 1;
default:
return 0;
}
// break not required because of switch...
case FL_FOCUS :
case FL_UNFOCUS :
if (Fl::visible_focus()) {
redraw();
return 1;
} else return 0;
case FL_ENTER :
case FL_LEAVE :
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);
}
}
if (Fl::focus() == this) draw_focus(FL_THIN_UP_FRAME, x(), y(), w(), h());
}
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_BOX);
step(1,1000);
}
//
// End of "$Id: Fl_Roller.cxx,v 1.6.2.4.2.6 2002/05/24 14:19:19 easysw Exp $".
//
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