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// Fl_Positioner.C
// 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();
}
}
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