1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
//
// "$Id: Fl_Positioner.cxx,v 1.3 1998/10/21 14:20:17 mike Exp $"
//
// Positioner widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998 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 1.3 1998/10/21 14:20:17 mike Exp $".
//
|
