Crate dotloom_geometry 

dotloom-geometry

Headless 2D geometry for Dotloom: f64 primitives, affine transforms, exact orientation predicates, curve intersections, split/trim/extend, dimension geometry, dimensioned quantities and a bounding-box spatial index.

This crate has no DOM, window or GPU dependency.

use dotloom_geometry::{Point, Segment, Shape, Curve, intersect, ModelTolerance};

let a = Curve::Line(Segment::new(Point::new(0.0, 0.0), Point::new(2.0, 2.0)));
let b = Curve::Line(Segment::new(Point::new(0.0, 2.0), Point::new(2.0, 0.0)));
let hits = intersect::intersect(&a, &b, ModelTolerance::DEFAULT);
assert_eq!(hits.points[0].point, Point::new(1.0, 1.0));

Re-exports

pub use spatial::SpatialIndex;

Modules

dimension

Dimension (measurement annotation) geometry.

edit

Split, trim and extend for lines, arcs, circles and line/arc polylines.

intersect

Curve/curve intersections.

math

Deterministic elementary functions.

spatial

Spatial index over bounding boxes (R*-tree via rstar).

units

Units and dimensioned quantities.

Structs

Aabb

Axis-aligned bounding box. An empty box has min > max.

Affine

A 2D affine transform [a b c d e f] with the SVG convention:

Anchor

A named semantic anchor of a shape.

Arc

A circular arc: center + radius·(cos θ, sin θ) for θ = start + sweep·t, t ∈ [0, 1].

Circle

A full circle.

CubicBez

Cubic Bézier curve.

FlatPath

Flattened ring/curve.

FlattenTolerance

Maximum distance (model units) between a curve and its flattened polyline.

ModelTolerance

Model comparison tolerance: |a - b| <= max(abs, rel * max(|a|, |b|)).

Path

A Bézier path made of subpaths.

Point

A position in the plane (model units, f64). Serialized as [x, y].

PointShape

A point marker.

Polygon

Polygon with straight edges and optional holes (even-odd fill).

Polyline

Open or closed polyline whose segments may be circular arcs (DXF-style bulge).

QuadBez

Quadratic Bézier curve.

Rect

Axis-aligned rectangle in local coordinates (rotation lives in the entity transform).

ScreenTolerance

A screen-space tolerance in CSS pixels (pick radius, snap radius).

Segment

A straight line segment from a to b.

SubPath

One subpath of a Path decomposed into curves.

Text

Text annotation. Height is the cap-to-descender line height in model units.

Vector

A displacement in the plane. Serialized as [x, y].

Enums

AnchorKind

Semantic anchor kinds, used by snapping and constraints.

Curve

One elementary curve piece. Shapes decompose into these for intersections, trimming, hit-testing and tessellation.

GeometryError

Errors produced by geometry operations.

HAlign

Horizontal text alignment.

LinearKind

Classification of the linear part of a transform.

Orientation

Orientation of three points using an exact (adaptive-precision) predicate.

PathEl

Path element.

Shape

A canonical 2D shape.

ShapeKind

Shape kinds.

TransformPolicy

How to handle transforms that a shape cannot represent exactly.

VAlign

Vertical text alignment.

Constants

MAX_SHAPE_POINTS

Limits enforced by Shape::validate to bound memory/CPU on untrusted input.

MAX_TEXT_CHARS

Maximum text length in characters.

Functions

arc_to_cubics

Approximate an arc by cubic Béziers (≤ 90° each).

circumcenter

Circumcenter of a triangle, None when collinear.

normalize_angle

Normalize an angle into [0, 2π).

normalize_angle_signed

Normalize an angle into (-π, π].

orientation

Exact orientation test (Shewchuk’s adaptive predicate via the robust crate).

point_in_ring

Even-odd point-in-ring test using exact orientation predicates.

ring_signed_area

Signed area (positive = counter-clockwise).

Type Aliases

GeoResult

Result alias for geometry operations.