blob: a3315a3e29dbd33b60cfbcab4a642bfa3ea104c8 (
plain)
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
|
#include "maths.h"
#include <cmath>
#include <glm/glm.hpp>
#include <glm/gtx/rotate_vector.hpp>
#include <glm/gtx/transform.hpp>
#include <glm/gtx/vector_angle.hpp>
glm::mat4
flat_orientation(const glm::vec3 & diff)
{
static const auto oneeighty {glm::rotate(pi, up)};
const auto flatdiff {glm::normalize(glm::vec3 {diff.x, 0, diff.z})};
auto e {glm::orientation(flatdiff, north)};
// Handle if diff is exactly opposite to north
return (std::isnan(e[0][0])) ? oneeighty : e;
}
float
flat_angle(const glm::vec3 & diff)
{
const auto flatdiff {glm::normalize(glm::vec3 {diff.x, 0, diff.z})};
return glm::orientedAngle(flatdiff, north, up);
}
float
round_frac(const float & v, const float & frac)
{
return std::round(v / frac) * frac;
}
float
normalize(float ang)
{
while (ang > pi) {
ang -= two_pi;
}
while (ang <= -pi) {
ang += two_pi;
}
return ang;
}
Arc
create_arc(const glm::vec3 & centre3, const glm::vec3 & e0p, const glm::vec3 & e1p)
{
const auto diffa = centre3 - e0p;
const auto diffb = centre3 - e1p;
const auto anga = flat_angle(diffa);
const auto angb = [&diffb, &anga]() {
const auto angb = flat_angle(diffb);
return (angb < anga) ? angb + two_pi : angb;
}();
return {anga, angb};
}
|
