spase

Micro library for performing 2D spatial calculations of DOM elements.

Usage

import { getFOV, hitTest, Point, Rect, Size } from 'spase';

API

Class: Point

A type representing a point on a 2D plane.

Class: Size

A type that represents a size on a 2D plane.

Class: Rect

A type representing a rectangle on a 2D plane.

Rect.intersecting(...elements)

Computes the intersecting Rect of one or more elements. If only 1 element is specified, the intersection will be computed against the viewport.

• @param elements: Element[] — Element(s) to be used to compute the intersecting Rect.
• @returns Rect | null — The intersecting Rect.

Rect.from(target[, options])

Gets the combined Rect of one or more elements.

• @param target: Rect | Window | Element | Element[] — An element or array of elements to compute the combined Rect.
• @param options — Additional options.
• @param options.reference: Window | Element | undefined — The element whose coordinate space the computed top, right, bottom and left values are relative to.
• @param options.overflow: boolean Specifies whether the overflow width/height should be accounted for.
• @returns Rect | null — The combined Rect.

Rect.fromViewport()

Gets the Rect of the viewport (current field of view). Think of this as the Rect of the current window.

• @returns Rect — The Rect of the viewport.

getFOV(element[, options])

Computes the field-of-view (FOV) of an element.

• @param element: Element | null The target element.
• @param options Additional options.
• @param options.reference: Window | Element | undefined — The element whose coordinate space the computed field-of-view is relative to.
• @returns FOV | null - The FOV if it is computable, null otherwise.

hitTest(obj1, obj2)

Hit-tests 2 objects. These objects can either be Point's, Rect's or Element's.

• @param obj1: Rect | Element | Element[] | Point | readonly [number number] | Readonly<{ x: number; y: number; }> | Rect[] — First object.
• @param obj2: Rect | Element | Element[] | Point | Rect[] — Second object.
• @returns boolean — true if test passes, false otherwise.

Caveats

Note that this library is intended to be used for 2D DOM elements only. If an element has transform styles applied to it, the top, right, bottom and left properties will be obscured. This is because the underlying method of calculating these values depends on the native getBoundingClientRect function.

Breaking Changes

v4.0.0

• Widths and heights now use offsetWidth and offsetHeight when applicable.

v3.0.0

• API changes: getIntersectRect, getRect, and getViewportRect are now static members of Rect class, as Rect.intersecting, Rect.from, and Rect.fromViewport, respectively.