Enum lyon_tessellation::Side

pub enum Side {
    Positive,
    Negative,
}

The positive or negative side of a vector or segment.

Given a reference vector v0, a vector v1 is on the positive side if the sign of the cross product v0 x v1 is positive.

This type does not use the left/right terminology to avoid confusion with left-handed / right-handed coordinate systems. Right-handed coordinate systems seem to be what a lot of people are most familiar with (especially in 2D), however most vector graphics specifications use y-down left-handed coordinate systems. Unfortunately mirroring the y axis inverts the meaning of “left” and “right”, which causes confusion. In practice:

• In a y-down left-handed coordinate system such as SVG’s, Side::Positive is the right side.
• In a y-up right-handed coordinate system, Side::Positive is the left side.

Variants

Positive

Negative

Implementations

impl Side

pub fn opposite(self) -> Side

pub fn is_positive(self) -> bool

pub fn is_negative(self) -> bool

pub fn to_f32(self) -> f32

Trait Implementations

impl Clone for Side

fn clone(&self) -> Side

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Side

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

Formats the value using the given formatter.

impl PartialEq<Side> for Side

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl Copy for Side

impl StructuralPartialEq for Side