diff options
Diffstat (limited to 'third_party/rust/uniffi-example-geometry/src/lib.rs')
-rw-r--r-- | third_party/rust/uniffi-example-geometry/src/lib.rs | 47 |
1 files changed, 0 insertions, 47 deletions
diff --git a/third_party/rust/uniffi-example-geometry/src/lib.rs b/third_party/rust/uniffi-example-geometry/src/lib.rs deleted file mode 100644 index d710b150bb..0000000000 --- a/third_party/rust/uniffi-example-geometry/src/lib.rs +++ /dev/null @@ -1,47 +0,0 @@ -/* This Source Code Form is subject to the terms of the Mozilla Public - * License, v. 2.0. If a copy of the MPL was not distributed with this - * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ - -// https://rust-lang.github.io/rust-clippy/master/index.html#float_cmp -// Silence, clippy! -const EPSILON: f64 = 0.0001f64; - -#[derive(Debug, Clone)] -pub struct Point { - coord_x: f64, - coord_y: f64, -} - -#[derive(Debug, Clone)] -pub struct Line { - start: Point, - end: Point, -} - -pub fn gradient(ln: Line) -> f64 { - let rise = ln.end.coord_y - ln.start.coord_y; - let run = ln.end.coord_x - ln.start.coord_x; - rise / run -} - -pub fn intersection(ln1: Line, ln2: Line) -> Option<Point> { - // TODO: yuck, should be able to take &Line as argument here - // and have rust figure it out with a bunch of annotations... - let g1 = gradient(ln1.clone()); - let z1 = ln1.start.coord_y - g1 * ln1.start.coord_x; - let g2 = gradient(ln2.clone()); - let z2 = ln2.start.coord_y - g2 * ln2.start.coord_x; - // Parallel lines do not intersect. - if (g1 - g2).abs() < EPSILON { - return None; - } - // Otherwise, they intersect at this fancy calculation that - // I found on wikipedia. - let x = (z2 - z1) / (g1 - g2); - Some(Point { - coord_x: x, - coord_y: g1 * x + z1, - }) -} - -uniffi::include_scaffolding!("geometry"); |