kopia lustrzana https://github.com/Tldraw/Tldraw
49 wiersze
1010 B
TypeScript
49 wiersze
1010 B
TypeScript
import { Bounds } from 'types'
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import vec from './vec'
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/**
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* Get whether a point is inside of a bounds.
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* @param A
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* @param b
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* @returns
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*/
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export function pointInBounds(A: number[], b: Bounds) {
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return !(A[0] < b.minX || A[0] > b.maxX || A[1] < b.minY || A[1] > b.maxY)
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}
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/**
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* Get whether a point is inside of a circle.
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* @param A
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* @param b
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* @returns
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*/
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export function pointInCircle(A: number[], C: number[], r: number) {
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return vec.dist(A, C) <= r
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}
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/**
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* Get whether a point is inside of an ellipse.
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* @param point
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* @param center
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* @param rx
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* @param ry
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* @param rotation
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* @returns
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*/
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export function pointInEllipse(
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A: number[],
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C: number[],
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rx: number,
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ry: number,
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rotation = 0
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) {
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rotation = rotation || 0
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const cos = Math.cos(rotation)
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const sin = Math.sin(rotation)
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const delta = vec.sub(A, C)
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const tdx = cos * delta[0] + sin * delta[1]
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const tdy = sin * delta[0] - cos * delta[1]
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return (tdx * tdx) / (rx * rx) + (tdy * tdy) / (ry * ry) <= 1
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}
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