@technobuddha/library/dist/scale.js

A large library of useful functions

/**
 * Scales a point relative to a given origin by a specified amount.
 * @param point - The point to be scaled, represented as a Cartesian coordinate.
 * @param amount - The scaling factor. Can be a single number (uniform scaling) or a Cartesian object for non-uniform scaling.
 * @param origin - The origin point about which the scaling is performed.
 * @returns The scaled point as a new Cartesian coordinate.
 * @internal
 */
function scalePoint(point, amount, origin) {
    const { x, y } = point;
    const { x: scaleX, y: scaleY } = typeof amount === 'number' ? { x: amount, y: amount } : amount;
    const { x: originX, y: originY } = origin;
    return {
        x: originX + (x - originX) * scaleX,
        y: originY + (y - originY) * scaleY,
    };
}
/**
 * Scales a point or a polygon of points around a given origin by a specified amount.
 * @group Geometry
 * @category Point
 * @category Polygon
 */
export function scale(point, amount, { origin = { x: 0, y: 0 } } = {}) {
    if (Array.isArray(point)) {
        return point.map((p) => scalePoint(p, amount, origin));
    }
    return scalePoint(point, amount, origin);
}
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