Struct CenterLineProfile

pub struct CenterLineProfile {
    pub path: Contour,
    pub half_width: f64,
}

An open path swept by a constant width, centred on the path.

This is a representation, not a contour: the closed area it denotes is the set of points within half_width of the path. Resolving it into a boundary is an offsetting algorithm, which belongs above this tier.

Keeping it exact matters because offsetting is lossy in a way that cannot be undone. Once a centre line is flattened into an outline, the fact that it was a constant-width path is gone, and with it the ability to change the width, re-offset at a different tolerance, or round-trip the source unchanged. Sheet metal, curtain-wall mullions and pipe centre lines are all authored this way.

The path is held as a Contour because a centre line is a sequence of bounded curve segments exactly like a boundary is; the difference is that this one is not closed and does not enclose anything on its own.

Fields

path: Contour

Open path the width is measured from.

half_width: f64

Half the constant width, measured perpendicular to the path.

Stored as a half-width rather than a full thickness so the two offset sides are symmetric by construction: a consumer offsets by +half and -half without having to remember to halve anything. Halving at the boundary is the kind of factor-of-two error that produces geometry which looks plausible and is wrong.

Implementations

impl CenterLineProfile

pub fn from_width(path: Contour, width: f64) -> CenterLineProfile

Construct from an open path and the full width across it.

pub fn width(&self) -> f64

The full width across the path.

Trait Implementations

impl Clone for CenterLineProfile

fn clone(&self) -> CenterLineProfile

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CenterLineProfile

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl PartialEq for CenterLineProfile

fn eq(&self, other: &CenterLineProfile) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for CenterLineProfile