line_intersection.rs - source

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visitors

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imp_std.rs lib.rs

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png

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polygon2

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proc_macro_crate

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error.rs iter.rs lib.rs parse.rs quote.rs

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quote

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join

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events

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physics

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postprocessing

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ringui_derive

rustc_demangle

legacy.rs lib.rs v0.rs

rusty_pool

ryu

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semver

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common.rs lib.rs range.rs recognize.rs version.rs

serde

de

ignored_any.rs impls.rs mod.rs seed.rs utf8.rs value.rs

private

de.rs doc.rs mod.rs ser.rs size_hint.rs

ser

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integer128.rs lib.rs macros.rs

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serde_json

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shaderdata_derive

simba

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complex.rs field.rs mod.rs real.rs subset.rs

simd

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slab

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slotmap

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smallvec

std140_data

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strsim

syn

synstructure

lib.rs macros.rs

thiserror

aserror.rs display.rs lib.rs

thiserror_impl

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thread_local

cached.rs lib.rs thread_id.rs unreachable.rs

tiff

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ifd.rs mod.rs stream.rs

encoder

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bytecast.rs error.rs lib.rs tags.rs

time

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toml

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typenum

array.rs bit.rs int.rs lib.rs marker_traits.rs operator_aliases.rs private.rs type_operators.rs uint.rs

unchecked_unwrap

unicode_xid

lib.rs tables.rs

vec2

cross.rs extract.rs inv.rs len.rs lerp.rs lib.rs min_max.rs new.rs norm.rs ops.rs set.rs transform.rs

vec3

cross.rs extract.rs inv.rs len.rs lerp.rs lib.rs min_max.rs new.rs norm.rs ops.rs set.rs transform.rs

weezl

decode.rs encode.rs error.rs lib.rs

x11

dpms.rs glx.rs internal.rs keysym.rs lib.rs link.rs xcursor.rs xf86vmode.rs xfixes.rs xft.rs xinerama.rs xinput.rs xinput2.rs xlib.rs xlib_xcb.rs xmd.rs xmu.rs xrandr.rs xrecord.rs xrender.rs xss.rs xt.rs xtest.rs

zlib_sys

use core::ops::{Div, Mul, Sub};
use num_traits::Signed;

use super::point_in_rect;

#[inline]
pub fn line_intersection<T>(
    out: &mut [T; 2],
    a1: &[T; 2],
    a2: &[T; 2],
    b1: &[T; 2],
    b2: &[T; 2],
) -> bool
where
    T: Clone + Signed + PartialEq + PartialOrd,
    for<'a, 'b> &'a T: Div<&'b T, Output = T> + Sub<&'b T, Output = T> + Mul<&'b T, Output = T>,
{
    let dax = &a1[0] - &a2[0];
    let dbx = &b1[0] - &b2[0];
    let day = &a1[1] - &a2[1];
    let dby = &b1[1] - &b2[1];

    let d = &(&dax * &dby) - &(&day * &dbx);
    if &d == &T::zero() {
        false
    } else {
        let ad = &(&a1[0] * &a2[1]) - &(&a1[1] * &a2[0]);
        let bd = &(&b1[0] * &b2[1]) - &(&b1[1] * &b2[0]);

        out[0] = &(&(&ad * &dbx) - &(&dax * &bd)) / &d;
        out[1] = &(&(&ad * &dby) - &(&day * &bd)) / &d;

        if point_in_rect(out, a1, a2) && point_in_rect(out, b1, b2) {
            true
        } else {
            false
        }
    }
}

#[test]
fn test_line_intersection() {
    let mut out = [0.0, 0.0];
    assert!(line_intersection(
        &mut out,
        &[0.0, 0.0],
        &[1.0, 1.0],
        &[1.0, 0.0],
        &[0.0, 1.0],
    ));
    assert_eq!(out, [0.5, 0.5]);

    assert!(!line_intersection(
        &mut [0.0, 0.0],
        &[1.0, 0.0],
        &[1.0, 1.0],
        &[-1.0, 0.0],
        &[-1.0, 1.0],
    ));
    assert!(!line_intersection(
        &mut [0.0, 0.0],
        &[0.0, 0.0],
        &[1.0, 1.0],
        &[2.0, 0.0],
        &[2.0, 1.0],
    ));
}