b930e2747e
- Added `--enable-uniffi-fixtures` flag. When set, we will compile in the UniFFI test fixtures into our shared Rust crate and eventually into `libxul`. - Vendoring in the Rust crates needed for `uniffi-bindgen-gecko-js` Differential Revision: https://phabricator.services.mozilla.com/D144467
48 lines
1.4 KiB
Rust
48 lines
1.4 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// https://rust-lang.github.io/rust-clippy/master/index.html#float_cmp
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// Silence, clippy!
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const EPSILON: f64 = 0.0001f64;
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#[derive(Debug, Clone)]
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pub struct Point {
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coord_x: f64,
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coord_y: f64,
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}
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#[derive(Debug, Clone)]
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pub struct Line {
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start: Point,
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end: Point,
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}
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pub fn gradient(ln: Line) -> f64 {
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let rise = ln.end.coord_y - ln.start.coord_y;
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let run = ln.end.coord_x - ln.start.coord_x;
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rise / run
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}
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pub fn intersection(ln1: Line, ln2: Line) -> Option<Point> {
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// TODO: yuck, should be able to take &Line as argument here
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// and have rust figure it out with a bunch of annotations...
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let g1 = gradient(ln1.clone());
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let z1 = ln1.start.coord_y - g1 * ln1.start.coord_x;
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let g2 = gradient(ln2.clone());
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let z2 = ln2.start.coord_y - g2 * ln2.start.coord_x;
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// Parallel lines do not intersect.
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if (g1 - g2).abs() < EPSILON {
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return None;
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}
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// Otherwise, they intersect at this fancy calculation that
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// I found on wikipedia.
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let x = (z2 - z1) / (g1 - g2);
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Some(Point {
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coord_x: x,
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coord_y: g1 * x + z1,
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})
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}
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include!(concat!(env!("OUT_DIR"), "/geometry.uniffi.rs"));
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