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41 lines
855 B
41 lines
855 B
export interface Pos {
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x: number
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y: number
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}
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export const NULL_POS: Pos = { x: 0, y: 0 }
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/**
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* Returns position of a relative to b
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* @param a
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* @param b
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*/
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export function relativeTo(a: Pos, b: Pos): Pos {
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return { x: a.x - b.x, y: a.y - b.y }
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}
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/**
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* Returns the middle position of the given rectangle
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* @param rect
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*/
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export function middlePos(rect: DOMRect): Pos {
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return { x: rect.x + rect.width / 2, y: rect.y + rect.height / 2 }
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}
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/**
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* Returns x and y distance between given two pos
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* @param a
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* @param b
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*/
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export function size(a: Pos, b: Pos): Pos {
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return { x: Math.abs(a.x - b.x), y: Math.abs(a.y - b.y) }
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}
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export function add(a: Pos, b: Pos): Pos {
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return { x: a.x + b.x, y: a.y + b.y }
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}
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export function angle(a: Pos, b: Pos): number {
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const r = relativeTo(a, b)
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return Math.atan2(r.x, r.y)
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} |