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
|
//
// Arc (integer) drawing functions for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2018 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:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
/**
\file Fl_GDI_Graphics_Driver_arci.cxx
\brief Utility functions for drawing circles using integers
*/
// "integer" circle drawing functions. These draw the limited
// circle types provided by X and NT graphics. The advantage of
// these is that small ones draw quite nicely (probably due to stored
// hand-drawn bitmaps of small circles!) and may be implemented by
// hardware and thus are fast.
#include "Fl_GDI_Graphics_Driver.H"
#include <FL/math.h>
#include <FL/platform.H>
void Fl_GDI_Graphics_Driver::arc_unscaled(float x, float y, float w, float h, double a1, double a2) {
if (w <= 0 || h <= 0) return;
int xa = x+w/2+int(w*cos(a1/180.0*M_PI));
int ya = y+h/2-int(h*sin(a1/180.0*M_PI));
int xb = x+w/2+int(w*cos(a2/180.0*M_PI));
int yb = y+h/2-int(h*sin(a2/180.0*M_PI));
if (fabs(a1 - a2) < 90) {
if (xa == xb && ya == yb) SetPixel(gc_, xa, ya, fl_RGB());
else Arc(gc_, x, y, x+w, y+h, xa, ya, xb, yb);
} else Arc(gc_, x, y, x+w, y+h, xa, ya, xb, yb);
}
void Fl_GDI_Graphics_Driver::pie_unscaled(float x, float y, float w, float h, double a1, double a2) {
if (w <= 0 || h <= 0) return;
if (a1 == a2) return;
int xa = x+w/2+int(w*cos(a1/180.0*M_PI));
int ya = y+h/2-int(h*sin(a1/180.0*M_PI));
int xb = x+w/2+int(w*cos(a2/180.0*M_PI));
int yb = y+h/2-int(h*sin(a2/180.0*M_PI));
SelectObject(gc_, fl_brush());
if (fabs(a1 - a2) < 90) {
if (xa == xb && ya == yb) {
MoveToEx(gc_, x+w/2, y+h/2, 0L);
LineTo(gc_, xa, ya);
SetPixel(gc_, xa, ya, fl_RGB());
} else Pie(gc_, x, y, x+w, y+h, xa, ya, xb, yb);
} else Pie(gc_, x, y, x+w, y+h, xa, ya, xb, yb);
}
|
