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//
// "$Id$"
//
// Positioner widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
// 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();
}
/** Returns the current position in x and y.*/
int Fl_Positioner::value(double X, double Y) {
clear_changed();
if (X == xvalue_ && Y == yvalue_) return 0;
xvalue_ = X; yvalue_ = Y;
redraw();
return 1;
}
/** Sets the X axis coordinate.*/
int Fl_Positioner::xvalue(double X) {
return(value(X, yvalue_));
}
/** Sets the Y axis coordinate.*/
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 xx = flinear(Fl::event_x(), x1, x1+w1-1.0, xmin, xmax);
if (xstep_) xx = int(xx/xstep_+0.5) * xstep_;
if (xmin < xmax) {
if (xx < xmin) xx = xmin;
if (xx > xmax) xx = xmax;
} else {
if (xx > xmin) xx = xmin;
if (xx < xmax) xx = xmax;
}
double yy = flinear(Fl::event_y(), y1, y1+h1-1.0, ymin, ymax);
if (ystep_) yy = int(yy/ystep_+0.5) * ystep_;
if (ymin < ymax) {
if (yy < ymin) yy = ymin;
if (yy > ymax) yy = ymax;
} else {
if (yy > ymin) yy = ymin;
if (yy < ymax) yy = ymax;
}
if (xx != xvalue_ || yy != yvalue_) {
xvalue_ = xx; yvalue_ = yy;
set_changed();
redraw();
} }
if (!(when() & FL_WHEN_CHANGED ||
(when() & FL_WHEN_RELEASE && event == FL_RELEASE))) return 1;
if (changed() || when()&FL_WHEN_NOT_CHANGED) {
if (event == FL_RELEASE) clear_changed();
do_callback();
}
return 1;
default:
return 0;
}
}
int Fl_Positioner::handle(int e) {
return handle(e, x(), y(), w(), h());
}
/**
Creates a new Fl_Positioner widget using the given position,
size, and label string. The default boxtype is FL_NO_BOX.
*/
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;
}
/** Sets the X axis bounds.*/
void Fl_Positioner::xbounds(double a, double b) {
if (a != xmin || b != xmax) {
xmin = a; xmax = b;
redraw();
}
}
/** Sets the Y axis bounds.*/
void Fl_Positioner::ybounds(double a, double b) {
if (a != ymin || b != ymax) {
ymin = a; ymax = b;
redraw();
}
}
//
// End of "$Id$".
//
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