Geometry

2D maths for points, rectangles and polygons — distance, angle, midpoint, area, and hit-testing. Coordinates are passed as plain numbers rather than Point or Rect objects, so nothing here needs a class, a canvas or an allocation per call, and it works equally for layout code, games and charts. Angles are radians to match Math.atan2 and the Canvas API, and distance2D uses Math.hypot, which avoids overflow on large coordinates.

Example

import { distance2D, pointInRect, polygonArea } from '@rtorcato/js-common/geometry'

// Hit-test a click against a box, in plain numbers — no Point/Rect classes.
const box = el.getBoundingClientRect()
pointInRect(event.clientX, event.clientY, box.left, box.top, box.width, box.height)

distance2D(0, 0, 3, 4)                // 5 — via Math.hypot, no overflow
polygonArea([[0, 0], [4, 0], [4, 3]]) // 6

Import

import { angle2D, distance2D, midpoint2D } from '@rtorcato/js-common/geometry'

Exports

Name	Summary
`angle2D`	Calculates the angle (in radians) between two points in 2D space.
`distance2D`	Calculates the distance between two points in 2D space.
`midpoint2D`	Calculates the midpoint between two points in 2D space.
`pointInRect`	Checks if a point is inside a rectangle.
`polygonArea`	Calculates the area of a polygon given its vertices (Shoelace formula).
`rectsOverlap`	Checks if two rectangles overlap.

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Example

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