point_to_line_distance.rs - source

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distance

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nonlinear_time_of_impact

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point

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visitors

aabb_sets_interferences_collector.rs bounding_volume_interferences_collector.rs composite_closest_point_visitor.rs composite_point_containment_test.rs mod.rs point_interferences_collector.rs ray_interferences_collector.rs ray_intersection_cost_fn_visitor.rs

error.rs mod.rs toi_dispatcher.rs

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linux.rs mod.rs

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png

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join

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ringui_derive

rustc_demangle

legacy.rs lib.rs v0.rs

rusty_pool

ryu

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pretty

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common.rs d2s.rs d2s_full_table.rs d2s_intrinsics.rs digit_table.rs f2s.rs f2s_intrinsics.rs lib.rs

scopeguard

seitan

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semver

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

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

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

ser

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de.rs error.rs iter.rs lib.rs macros.rs map.rs number.rs read.rs ser.rs

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

simd

auto_simd_impl.rs mod.rs simd_bool.rs simd_complex.rs simd_option.rs simd_partial_ord.rs simd_real.rs simd_signed.rs simd_value.rs

slab

slice_of_array

slotmap

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smallvec

std140_data

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lib.rs sources.rs

strsim

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lib.rs macros.rs

thiserror

aserror.rs display.rs lib.rs

thiserror_impl

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thread_local

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tiff

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typenum

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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::{Add, Div, Mul, Sub};

use num_traits::{Bounded, Float};

use super::Intersection;

#[inline]
pub fn point_to_line_distance<T>(p: &[T; 2], a: &[T; 2], b: &[T; 2]) -> T
where
    T: Clone + Float + Bounded + PartialOrd,
    for<'a, 'b> &'a T: Add<&'b T, Output = T>
        + Sub<&'b T, Output = T>
        + Div<&'b T, Output = T>
        + Mul<&'b T, Output = T>,
{
    let mut intersection = Intersection::new();
    point_to_line_intersection(&mut intersection, p, a, b, 0);
    intersection.distance
}

#[inline]
pub fn point_to_line_intersection<T>(
    intersection: &mut Intersection<T>,
    p: &[T; 2],
    a: &[T; 2],
    b: &[T; 2],
    edge: usize,
) where
    T: Clone + Float + PartialOrd,
    for<'a, 'b> &'a T: Add<&'b T, Output = T>
        + Sub<&'b T, Output = T>
        + Div<&'b T, Output = T>
        + Mul<&'b T, Output = T>,
{
    let x = &p[0];
    let y = &p[1];
    let x1 = &a[0];
    let y1 = &a[1];
    let x2 = &b[0];
    let y2 = &b[1];

    let a = x - x1;
    let b = y - y1;
    let c = x2 - x1;
    let d = y2 - y1;

    let dot = &(&a * &c) + &(&b * &d);
    let len_sq = &(&c * &c) + &(&d * &d);
    let param = &dot / &len_sq;

    let (xx, yy) = if &param <= &T::zero() || (x1 == x2 && y1 == y2) {
        (x1.clone(), y1.clone())
    } else if &param >= &T::one() {
        (x2.clone(), y2.clone())
    } else {
        (x1 + &(&param * &c), y1 + &(&param * &d))
    };

    let dx = x - &xx;
    let dy = y - &yy;
    let dst = (&(&dx * &dx) + &(&dy * &dy)).sqrt();

    if dst < intersection.distance {
        intersection.distance = dst;
        intersection.edge = edge;
        intersection.point[0] = xx;
        intersection.point[1] = yy;
    }
}

#[test]
fn test_point_to_line_distance() {
    assert_eq!(
        point_to_line_distance(&[0.0, 0.0], &[0.0, 0.0], &[0.0, 1.0]),
        0.0
    );
    assert_eq!(
        point_to_line_distance(&[0.0, 1.0], &[0.0, 0.0], &[0.0, 1.0]),
        0.0
    );
    assert_eq!(
        point_to_line_distance(&[1.0, 1.0], &[0.0, 0.0], &[0.0, 1.0]),
        1.0
    );
    assert_eq!(
        point_to_line_distance(&[-1.0, 0.0], &[0.0, 0.0], &[0.0, 1.0]),
        1.0
    );
}