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61 lines
1.7 KiB
61 lines
1.7 KiB
//
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// …
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//
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// Georg Hopp <georg@steffers.org>
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//
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// Copyright © 2019 Georg Hopp
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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use std::fmt::Debug;
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use std::ops::{Add, Div, Sub};
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use super::canvas::{Vertex, Vertices};
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use super::drawable::Drawable;
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#[derive(Debug, Clone)]
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pub struct Polyline<T>(pub Vertices<T>);
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impl<T> Drawable<T> for Polyline<T>
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where T: Add<Output = T> + Sub<Output = T> + Div<Output = T>
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+ Debug + Clone + Copy + From<i32> {
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fn plot(&self) -> Vertices<T> {
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let Polyline(cs) = self;
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match cs[..] {
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[] => Vec::<Vertex<T>>::new(),
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[a] => vec!(a),
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[a, b] => a.line(b),
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_ => {
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let (a, b) = (cs[0], cs[1]);
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let mut r = a.line(b);
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let mut i = b;
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for j in cs[2..].iter() {
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r.append(&mut i.line(*j)[1..].to_vec());
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i = *j;
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}
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r
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},
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}
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}
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}
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/*
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impl<T> Display for Polyline<T> where T: Copy {
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fn fmt(&self, f: &mut Formatter<'_>) -> Result {
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let Polyline(a) = self;
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write!(f, "PLine[{}]", a)
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}
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}
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*/
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