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
|
//
// Arc (integer) drawing functions 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:
//
// 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_OpenGL_Graphics_Driver_arci.cxx
\brief Utility functions for drawing circles using integers
*/
#include <config.h>
#include "Fl_OpenGL_Graphics_Driver.H"
#include <FL/gl.h>
#include <FL/Fl_Gl_Window.H>
#include <FL/Fl_RGB_Image.H>
#include <FL/Fl.H>
#include <FL/fl_draw.H>
#define _USE_MATH_DEFINES
#include <FL/math.h>
void Fl_OpenGL_Graphics_Driver::arc(int x,int y,int w,int h,double a1,double a2) {
if (w <= 0 || h <= 0) return;
while (a2<a1) a2 += 360.0; // TODO: write a sensible fmod angle alignment here
a1 = a1/180.0*M_PI; a2 = a2/180.0*M_PI;
double cx = x + 0.5*w, cy = y + 0.5*h;
double rx = 0.5*w-0.3, ry = 0.5*h-0.3;
double rMax; if (w>h) rMax = rx; else rMax = ry;
int nSeg = (int)(10 * sqrt(rMax))+1;
double incr = (a2-a1)/(double)nSeg;
glBegin(GL_LINE_STRIP);
for (int i=0; i<=nSeg; i++) {
glVertex2d(cx+cos(a1)*rx, cy-sin(a1)*ry);
a1 += incr;
}
glEnd();
}
void Fl_OpenGL_Graphics_Driver::arc(double x, double y, double r, double start, double end) {
Fl_Graphics_Driver::arc(x, y, r, start, end);
}
void Fl_OpenGL_Graphics_Driver::pie(int x,int y,int w,int h,double a1,double a2) {
if (w <= 0 || h <= 0) return;
while (a2<a1) a2 += 360.0; // TODO: write a sensible fmod angle alignment here
a1 = a1/180.0*M_PI; a2 = a2/180.0*M_PI;
double cx = x + 0.5*w, cy = y + 0.5*h;
double rx = 0.5*w, ry = 0.5*h;
double rMax; if (w>h) rMax = rx; else rMax = ry;
int nSeg = (int)(10 * sqrt(rMax))+1;
double incr = (a2-a1)/(double)nSeg;
glBegin(GL_TRIANGLE_FAN);
glVertex2d(cx, cy);
for (int i=0; i<=nSeg; i++) {
glVertex2d(cx+cos(a1)*rx, cy-sin(a1)*ry);
a1 += incr;
}
glEnd();
}
|
