Enum HitShape 

pub enum HitShape {
    Rect,
    Rounded([f32; 4]),
    Segments {
        first: u32,
        len: u32,
        width: f32,
    },
    Polygon {
        first: u32,
        len: u32,
    },
}

The shape inside a region’s rect that a point has to be in to hit it (docs/adr/0026-hit-testing-by-shape.md). The rect is always tested first, so a shape is evaluated only for the few regions under the pointer. Inline on the region rather than behind an index: the ADR priced the twenty bytes at +7% on a 10k-region frame and measured nothing, so the simpler shape won. Points for a stroke or a fill live in the interaction’s own list, relative to the region’s top-left in logical px, copied at emission because the frame’s stores do not outlive the frame and a press does.

Variants

Rect

The whole rect — every box, and what every region was before.

Rounded([f32; 4])

A box with rounded corners: a point in a corner’s square but past its arc misses. Radii clockwise from the top-left, logical px, as the node’s radius row.

Segments

A round-capped stroke through len points from first, width wide: a point within half the width of any piece hits. A hairline is hard to hit, so the grab is at least MIN_STROKE_GRAB wide.

Fields

first: u32

len: u32

width: f32

Polygon

A filled outline through len points from first: a point inside by the even-odd rule hits — the same rule the stock polygon paints by, so the hit is the fill exactly, a self-intersecting outline’s unfilled overlaps included.

Fields

first: u32

len: u32

Trait Implementations

impl Clone for HitShape

fn clone(&self) -> HitShape

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for HitShape

impl Debug for HitShape

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

Formats the value using the given formatter.

impl PartialEq for HitShape

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for HitShape