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

/*
Copyright 2017 Martin Buck
This file is part of rust-3d.
rust-3d is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
rust-3d is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with rust-3d.  If not, see <http://www.gnu.org/licenses/>.
*/

//! LineSegment2D, a line segment within 2D space

use std::fmt;

use prelude::*;

#[derive (Debug, PartialEq, PartialOrd, Eq, Clone, Hash)]
/// LineSegment2D, a line segment within 2D space
pub struct LineSegment2D {
    pub line: Line2D,
    pub length: Positive,
}

impl LineSegment2D {
    /// Creates a new LineSegment2D from a Line2D and a length
    pub fn new(line: Line2D, length: Positive) -> Self {
        LineSegment2D{line: line, length: length}
    }
}

impl IsMovable2D for LineSegment2D {
    fn move_by(&mut self, x: f64, y: f64) {
        self.line.move_by(x, y);
    }
}

impl HasLength for LineSegment2D {
    fn length(&self) -> f64 {
        self.length.get()
    }
}

impl HasBoundingBox2D for LineSegment2D {
    fn bounding_box(&self) -> Result<BoundingBox2D> {
        let mut pts = Vec::new();
        pts.push(Box::new(self.line.anchor.clone()));
        pts.push(Box::new(self.line.anchor.clone() + self.line.dir.clone() * self.length.get()));
        BoundingBox2D::from_iterator(pts.iter())
    }
}

impl HasCenterOfGravity2D for LineSegment2D {
    fn center_of_gravity(&self) -> Result<Point2D> {
        Ok(self.line.anchor.clone() + self.line.dir.clone() * 0.5 * self.length.get())
    }
}

impl fmt::Display for LineSegment2D {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "({}, {} -> {} * {}, {})", self.line.anchor.x(), self.line.anchor.y(), self.length, self.line.dir.x(), self.line.dir.y())
    }
}