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- //
- // "$Id: Fl_Positioner.cxx,v 1.4 1999/01/07 19:17:25 mike Exp $"
- //
- // Positioner 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".
- //
-
- // The positioner widget from Forms, gives 2D input
- // Written by: Mark Overmars
-
- #include <FL/Fl.H>
- #include <FL/Fl_Positioner.H>
- #include <FL/fl_draw.H>
-
- static double flinear(double val, double smin, double smax, double gmin, double gmax)
- {
- if (smin == smax) return gmax;
- else return gmin + (gmax - gmin) * (val - smin) / (smax - smin);
- }
-
- void Fl_Positioner::draw(int x, int y, int w, int h) {
- int x1 = x + 4;
- int y1 = y + 4;
- int w1 = w - 2 * 4;
- int h1 = h - 2 * 4;
- int xx = int(flinear(xvalue(), xmin, xmax, x1, x1+w1-1)+.5);
- int yy = int(flinear(yvalue(), ymin, ymax, y1, y1+h1-1)+.5);
- draw_box(box(), x, y, w, h, color());
- fl_color(selection_color());
- fl_xyline(x1, yy, x1+w1);
- fl_yxline(xx, y1, y1+h1);
- }
-
- void Fl_Positioner::draw() {
- draw(x(), y(), w(), h());
- draw_label();
- }
-
- int Fl_Positioner::value(double X, double Y) {
- clear_changed();
- if (X == xvalue_ && Y == yvalue_) return 0;
- xvalue_ = X; yvalue_ = Y;
- redraw();
- return 1;
- }
-
- int Fl_Positioner::xvalue(double X) {
- return(value(X, yvalue_));
- }
-
- int Fl_Positioner::yvalue(double Y) {
- return(value(xvalue_, Y));
- }
-
- int Fl_Positioner::handle(int event, int x, int y, int w, int h) {
- switch (event) {
- case FL_PUSH:
- case FL_DRAG:
- case FL_RELEASE: {
- double x1 = x + 4;
- double y1 = y + 4;
- double w1 = w - 2 * 4;
- double h1 = h - 2 * 4;
- double X = flinear(Fl::event_x(), x1, x1+w1-1.0, xmin, xmax);
- if (xstep_) X = int(X/xstep_+0.5) * xstep_;
- if (X < xmin) X = xmin;
- if (X > xmax) X = xmax;
- double Y = flinear(Fl::event_y(), y1, y1+h1-1.0, ymin, ymax);
- if (ystep_) Y = int(Y/ystep_+0.5) * ystep_;
- if (Y < ymin) Y = ymin;
- if (Y > ymax) Y = ymax;
- if (value(X, Y)) set_changed();}
- if (!(when() & FL_WHEN_CHANGED ||
- when() & FL_WHEN_RELEASE && event == FL_RELEASE)) return 1;
- if (changed() || when()&FL_WHEN_NOT_CHANGED) {
- clear_changed(); do_callback();}
- return 1;
- default:
- return 0;
- }
- }
-
- int Fl_Positioner::handle(int e) {
- return handle(e, x(), y(), w(), h());
- }
-
- Fl_Positioner::Fl_Positioner(int x, int y, int w, int h, const char* l)
- : Fl_Widget(x, y, w, h, l) {
- box(FL_DOWN_BOX);
- selection_color(FL_RED);
- align(FL_ALIGN_BOTTOM);
- when(FL_WHEN_CHANGED);
- xmin = ymin = 0;
- xmax = ymax = 1;
- xvalue_ = yvalue_ = .5;
- xstep_ = ystep_ = 0;
- }
-
- void Fl_Positioner::xbounds(double a, double b) {
- if (a != xmin || b != xmax) {
- xmin = a; xmax = b;
- redraw();
- }
- }
-
- void Fl_Positioner::ybounds(double a, double b) {
- if (a != ymin || b != ymax) {
- ymin = a; ymax = b;
- redraw();
- }
- }
-
- //
- // End of "$Id: Fl_Positioner.cxx,v 1.4 1999/01/07 19:17:25 mike Exp $".
- //
-