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

use super::cubic_bezier::CubicBezier;
use super::line::LineSegment;
use super::point::Point;
use super::quadratic_bezier::QuadraticBezier;
use super::*;

#[derive(Copy, Clone, Debug, PartialEq)]
pub enum BezierSegment<P: Point> {
    Linear(LineSegment<P>),
    Quadratic(QuadraticBezier<P>),
    Cubic(CubicBezier<P>),
}

impl<P> BezierSegment<P>
where
    P: Point,
{
    pub fn eval<F>(&self, t: P::Scalar) -> P {
        match self {
            BezierSegment::Linear(segment) => segment.eval(t),
            BezierSegment::Quadratic(segment) => segment.eval(t),
            BezierSegment::Cubic(segment) => segment.eval(t),
        }
    }

    pub fn start(&self) -> P {
        match self {
            BezierSegment::Linear(segment) => segment.start,
            BezierSegment::Quadratic(segment) => segment.start,
            BezierSegment::Cubic(segment) => segment.start,
        }
    }

    #[inline]
    pub fn end(&self) -> P {
        match self {
            BezierSegment::Linear(segment) => segment.end,
            BezierSegment::Quadratic(segment) => segment.end,
            BezierSegment::Cubic(segment) => segment.end,
        }
    }

    #[inline]
    pub fn is_linear<F>(&self, tolerance: F) -> bool
    where
        F: Float + Into<P::Scalar>,
    {
        match self {
            BezierSegment::Linear(..) => true,
            BezierSegment::Quadratic(segment) => segment.is_linear(tolerance.into()),
            BezierSegment::Cubic(segment) => segment.is_linear(tolerance.into()),
        }
    }

    #[inline]
    pub fn baseline(&self) -> LineSegment<P> {
        match self {
            BezierSegment::Linear(segment) => *segment,
            BezierSegment::Quadratic(segment) => segment.baseline(),
            BezierSegment::Cubic(segment) => segment.baseline(),
        }
    }

    /// Split this segment into two sub-segments.
    pub fn split<F>(&self, t: F) -> (BezierSegment<P>, BezierSegment<P>)
    where
        F: Float + Into<P::Scalar>,
    {
        match self {
            BezierSegment::Linear(segment) => {
                let (a, b) = segment.split(t.into());
                (BezierSegment::Linear(a), BezierSegment::Linear(b))
            }
            BezierSegment::Quadratic(segment) => {
                let (a, b) = segment.split(t.into());
                (BezierSegment::Quadratic(a), BezierSegment::Quadratic(b))
            }
            BezierSegment::Cubic(segment) => {
                let (a, b) = segment.split(t.into());
                (BezierSegment::Cubic(a), BezierSegment::Cubic(b))
            }
        }
    }
}

impl<P> From<LineSegment<P>> for BezierSegment<P>
where
    P: Point,
{
    fn from(s: LineSegment<P>) -> Self {
        BezierSegment::Linear(s)
    }
}

impl<P> From<QuadraticBezier<P>> for BezierSegment<P>
where
    P: Point,
{
    fn from(s: QuadraticBezier<P>) -> Self {
        BezierSegment::Quadratic(s)
    }
}

impl<P> From<CubicBezier<P>> for BezierSegment<P>
where
    P: Point,
{
    fn from(s: CubicBezier<P>) -> Self {
        BezierSegment::Cubic(s)
    }
}