Crate day_geometry 

day-geometry — plain Copy value types shared by layout, canvas, and the toolkit spec. Everything is in points (density-independent); backends convert to device pixels (§7.9).

Structs

Affine

A 2-D affine transform (CoreGraphics row-vector convention): a point p maps to (a·p.x + c·p.y + tx, b·p.x + d·p.y + ty). Used by canvas transform ops for shape rotate/scale/offset — every native 2-D context concatenates it onto its CTM identically.

Color

sRGB color, 0.0–1.0 components. Semantic theme tokens (§6.3) resolve to these in the backend.

Insets

Logical insets: leading/trailing resolve against the layout direction at place time (§7.8).

Point

Proposal

The layout proposal: None = unconstrained on that axis (§7.2).

Rect

Size

Transform

A cheap per-node visual transform (§8.4 animation): translation, uniform/non-uniform scale, and rotation about a unit anchor (0.0..1.0 within the node’s bounds; default center). Distinct from the layout frame — animating a Transform never triggers relayout, so it is the vehicle for movement/scaling animation. Each backend composes it onto the node’s laid-out frame via its native transform channel (CALayer/GskTransform/RenderTransform/NODE_TRANSFORM/…).

Enums

LayoutDirection

Traits

Animatable

Linear interpolation of animatable values (t in 0.0..1.0). This drives the canvas / self-driven animation path (docs/shapes.md §5) and Qt’s sampled spring; native-widget animation does NOT use it — the toolkit interpolates on its own compositor.