[go: up one dir, main page]

lyon_core 0.4.0

Common resources to all lyon crates.
Documentation 
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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189


use math::{ Point, Vec2 };

use super::{ PathEvent, SvgEvent, FlattenedEvent };

/// Represents the current state of a path while it is being built.
pub struct PathState {
    /// The current point.
    pub current: Point,
    /// The first point of the current sub-path.
    pub first: Point,
    /// The last control point.
    pub last_ctrl: Point,
}

impl PathState {
    pub fn new() -> Self {
        PathState {
            current: Point::new(0.0, 0.0),
            first: Point::new(0.0, 0.0),
            last_ctrl: Point::new(0.0, 0.0),
        }
    }
}

impl PathState {
    pub fn svg_event(&mut self, event: SvgEvent) {
        match event {
            SvgEvent::MoveTo(to) => { self.move_to(to); }
            SvgEvent::RelativeMoveTo(to) => {
                let to = self.from_relative(to);
                self.move_to(to);
            }
            SvgEvent::LineTo(to) => { self.line_to(to) }
            SvgEvent::QuadraticTo(ctrl, to) => { self.curve_to(ctrl, to); }
            SvgEvent::CubicTo(_, ctrl2, to) => { self.curve_to(ctrl2, to); }
            SvgEvent::ArcTo(to, _, _, _) => {
                self.last_ctrl = self.current; // TODO
                self.current = to;
            }
            SvgEvent::RelativeLineTo(to) => {
                let to = self.from_relative(to);
                self.line_to(to);
            }
            SvgEvent::RelativeQuadraticTo(ctrl, to) => {
                let to = self.from_relative(to);
                let ctrl = self.from_relative(ctrl);
                self.curve_to(ctrl, to);
            }
            SvgEvent::RelativeCubicTo(_, ctrl2, to) => {
                let to = self.from_relative(to);
                let ctrl2 = self.from_relative(ctrl2);
                self.curve_to(ctrl2, to);
            }
            SvgEvent::RelativeArcTo(to, _, _, _) => {
                self.last_ctrl = self.current; // TODO
                self.relative_next(to);
            }
            SvgEvent::HorizontalLineTo(x) => {
                let to = Point::new(x, self.current.y);
                self.line_to(to);
            }
            SvgEvent::VerticalLineTo(y) => {
                let to = Point::new(self.current.x, y);
                self.line_to(to);
            }
            SvgEvent::RelativeHorizontalLineTo(x) => {
                let to = self.current + Point::new(x, 0.0);
                self.line_to(to);
            }
            SvgEvent::RelativeVerticalLineTo(y) => {
                let to = self.current + Point::new(0.0, y);
                self.line_to(to);
            }
            SvgEvent::SmoothQuadraticTo(to) => {
                let ctrl = self.get_smooth_ctrl();
                self.curve_to(ctrl, to);
            }
            SvgEvent::SmoothCubicTo(ctrl2, to) => {
                self.curve_to(ctrl2, to);
            }
            SvgEvent::SmoothRelativeQuadraticTo(to) => {
                let ctrl = self.get_smooth_ctrl();
                let to = self.from_relative(to);
                self.curve_to(ctrl, to);
            }
            SvgEvent::SmoothRelativeCubicTo(ctrl2, to) => {
                let ctrl2 = self.from_relative(ctrl2);
                let to = self.from_relative(to);
                self.curve_to(ctrl2, to);
            }
            SvgEvent::Close => {
                self.close();
            }
        }
    }

    pub fn path_event(&mut self, event: PathEvent) {
        match event {
            PathEvent::MoveTo(to) => { self.move_to(to); }
            PathEvent::LineTo(to) => { self.line_to(to); }
            PathEvent::QuadraticTo(ctrl, to) => { self.curve_to(ctrl, to); }
            PathEvent::CubicTo(_, ctrl2, to) => { self.curve_to(ctrl2, to); }
            PathEvent::Close => { self.close(); }
        }
    }

    pub fn flattened_event(&mut self, event: FlattenedEvent) {
        match event {
            FlattenedEvent::MoveTo(to) => { self.move_to(to); }
            FlattenedEvent::LineTo(to) => { self.line_to(to); }
            FlattenedEvent::Close => { self.close(); }
        }
    }

    pub fn move_to(&mut self, to: Point) {
        self.last_ctrl = self.current;
        self.current = to;
        self.first = to;
    }

    pub fn line_to(&mut self, to: Point) {
        self.last_ctrl = self.current;
        self.current = to;
    }

    pub fn curve_to(&mut self, ctrl: Point, to: Point) {
        self.last_ctrl = ctrl;
        self.current = to;
    }

    pub fn close(&mut self) {
        self.last_ctrl = self.first;
        self.current = self.first;
    }

    pub fn next(&mut self, to: Point) { self.current = to; }

    pub fn relative_next(&mut self, to: Point) { self.current = self.from_relative(to); }

    pub fn get_smooth_ctrl(&self) -> Point { self.current + (self.current - self.last_ctrl) }

    pub fn from_relative(&self, v: Vec2) -> Point { self.current + v }

    pub fn svg_to_path_event(&self, event: SvgEvent) -> PathEvent {
        return match event {
            SvgEvent::MoveTo(to) => { PathEvent::MoveTo(to) }
            SvgEvent::LineTo(to) => { PathEvent::LineTo(to) }
            SvgEvent::QuadraticTo(ctrl, to) => { PathEvent::QuadraticTo(ctrl, to) }
            SvgEvent::CubicTo(ctrl1, ctrl2, to) => { PathEvent::CubicTo(ctrl1, ctrl2, to) }
            SvgEvent::Close => { PathEvent::Close }
            SvgEvent::RelativeMoveTo(to) => { PathEvent::MoveTo(self.from_relative(to)) }
            SvgEvent::RelativeLineTo(to) => { PathEvent::LineTo(self.from_relative(to)) }
            SvgEvent::RelativeQuadraticTo(ctrl, to) => {
                PathEvent::QuadraticTo(self.from_relative(ctrl), self.from_relative(to))
            }
            SvgEvent::RelativeCubicTo(ctrl1, ctrl2, to) => {
                PathEvent::CubicTo(
                    self.from_relative(ctrl1),
                    self.from_relative(ctrl2),
                    self.from_relative(to)
                )
            }
            SvgEvent::HorizontalLineTo(x) => { PathEvent::LineTo(Point::new(x, self.current.y)) }
            SvgEvent::VerticalLineTo(y) => { PathEvent::LineTo(Point::new(self.current.x, y)) }
            SvgEvent::RelativeHorizontalLineTo(x) => { PathEvent::LineTo(Point::new(self.current.x + x, self.current.y)) }
            SvgEvent::RelativeVerticalLineTo(y) => { PathEvent::LineTo(Point::new(self.current.x, self.current.y + y)) }
            SvgEvent::SmoothQuadraticTo(to) => {
                PathEvent::QuadraticTo(self.get_smooth_ctrl(), to)
            }
            SvgEvent::SmoothCubicTo(ctrl2, to) => {
                PathEvent::CubicTo(self.get_smooth_ctrl(), ctrl2, to)
            }
            SvgEvent::SmoothRelativeQuadraticTo(to) => {
                PathEvent::QuadraticTo(self.get_smooth_ctrl(), self.from_relative(to))
            }
            SvgEvent::SmoothRelativeCubicTo(ctrl2, to) => {
                PathEvent::CubicTo(
                    self.get_smooth_ctrl(),
                    self.from_relative(ctrl2),
                    self.from_relative(to)
                )
            }
            // TODO arcs
            _ => { unimplemented!() }
        };
    }
}