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

use crate::{PathI32, PathF64, PointF64, Spline};

#[derive(Debug)]
pub struct CompoundPath {
    pub paths: Vec<CompoundPathElement>,
}

#[derive(Debug)]
pub enum CompoundPathElement {
    PathI32(PathI32),
    PathF64(PathF64),
    Spline(Spline),
}

impl Default for CompoundPath {
    fn default() -> Self {
        Self::new()
    }
}

impl CompoundPath {

    pub fn new() -> Self {
        Self {
            paths: vec![]
        }
    }

    pub fn iter(&self) -> std::slice::Iter<CompoundPathElement> {
        self.paths.iter()
    }

    pub fn append(&mut self, mut other: Self) {
        self.paths.append(&mut other.paths);
    }

    pub fn add_path_i32(&mut self, path: PathI32) {
        self.paths.push(CompoundPathElement::PathI32(path));
    }

    pub fn add_path_f64(&mut self, path: PathF64) {
        self.paths.push(CompoundPathElement::PathF64(path));
    }

    pub fn add_spline(&mut self, path: Spline) {
        self.paths.push(CompoundPathElement::Spline(path));
    }

    /// returns a single svg path string in relative path syntax and offset
    pub fn to_svg_string(&self, close: bool, offset: PointF64) -> (String, PointF64) {
        let origin = if !self.paths.is_empty() {
            match &self.paths[0] {
                CompoundPathElement::PathI32(p) => -p.path[0].to_point_f64(),
                CompoundPathElement::PathF64(p) => -p.path[0],
                CompoundPathElement::Spline(p) => -p.points[0],
            }
        } else {
            PointF64::default()
        };

        let string = self.paths.iter().map(|p| {
            match p {
                CompoundPathElement::PathI32(p) => p.to_svg_string(close, &origin.to_point_i32()),
                CompoundPathElement::PathF64(p) => p.to_svg_string(close, &origin),
                CompoundPathElement::Spline(p) => p.to_svg_string(close, &origin),
            }
        }).collect::<String>();

        (string, offset - origin)
    }

    pub fn reduce(&self, tolerance: f64) -> Self {
        CompoundPath {
            paths: self.paths.iter().filter_map(|path| {
                match path {
                    CompoundPathElement::PathI32(path) => {
                        if let Some(path) = path.reduce(tolerance)
                        { Some(CompoundPathElement::PathI32(path)) } else { None }
                    },
                    CompoundPathElement::PathF64(path) => {
                        if let Some(path) = path.reduce(tolerance)
                        { Some(CompoundPathElement::PathF64(path)) } else { None }
                    },
                    CompoundPathElement::Spline(_) => panic!("unimplemented!()"),
                }
            }).collect()
        }
    }

    pub fn remove_holes(&mut self) {
        self.paths.truncate(1);
    }

    pub fn is_empty(&self) -> bool {
        self.paths.is_empty()
    }

    const DEFAULT_MAX_ITERATIONS: usize = 10;

    pub fn smooth(&self, corner_threshold: f64, outset_ratio: f64, segment_length: f64) -> Self {
        CompoundPath {
            paths: self.paths.iter().map(|path| {
                match path {
                    CompoundPathElement::PathI32(path) => CompoundPathElement::PathF64(path.smooth(
                        corner_threshold, outset_ratio, segment_length, Self::DEFAULT_MAX_ITERATIONS
                    )),
                    CompoundPathElement::PathF64(path) => CompoundPathElement::PathF64(path.smooth(
                        corner_threshold, outset_ratio, segment_length, Self::DEFAULT_MAX_ITERATIONS
                    )),
                    CompoundPathElement::Spline(_) => panic!("unimplemented!()"),
                }
            }).collect()
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::PointI32;
    use super::*;

    #[test]
    fn test_to_svg_string() {
        let mut paths = CompoundPath::new();
        let mut path = PathI32::new();
        path.add(PointI32 { x: 1, y: 1 });
        path.add(PointI32 { x: 2, y: 1 });
        path.add(PointI32 { x: 2, y: 2 });
        path.add(PointI32 { x: 1, y: 1 });
        paths.add_path_i32(path);

        let (string, offset) = paths.to_svg_string(true, PointF64 { x: 0.0, y: 0.0 });
        assert_eq!("M0,0 L1,0 L1,1 Z ", string);
        assert_eq!(offset, PointF64 { x: 1.0, y: 1.0 });
    }

    #[test]
    fn test_to_svg_string_compound() {
        let mut paths = CompoundPath::new();

        let mut path1 = PathI32::new();
        path1.add(PointI32 { x: 1, y: 1 });
        path1.add(PointI32 { x: 2, y: 1 });
        path1.add(PointI32 { x: 2, y: 2 });
        path1.add(PointI32 { x: 1, y: 1 });
        paths.add_path_i32(path1);

        let mut path2 = PathI32::new();
        path2.add(PointI32 { x: 3, y: 3 });
        path2.add(PointI32 { x: 4, y: 3 });
        path2.add(PointI32 { x: 4, y: 4 });
        path2.add(PointI32 { x: 3, y: 3 });
        paths.add_path_i32(path2);

        let (string, offset) = paths.to_svg_string(true, PointF64 { x: 1.0, y: 1.0 });
        assert_eq!("M0,0 L1,0 L1,1 Z M2,2 L3,2 L3,3 Z ", string);
        assert_eq!(offset, PointF64 { x: 2.0, y: 2.0 });
    }
}