image-js/lib/point/operations.js

Image processing and manipulation in JavaScript

/**
 * Rotate a point around a center by a given angle.
 * @param point - The point to rotate
 * @param rotationCenter - The center of rotation
 * @param angle - The angle of rotation in radians
 * @returns The rotated point
 */
export function rotatePoint(point, rotationCenter, angle) {
    const angleCos = Math.cos(angle);
    const angleSin = Math.sin(angle);
    const column = point.column * angleCos -
        point.row * angleSin +
        (1 - angleCos) * rotationCenter.column +
        rotationCenter.row * angleSin;
    const row = point.column * angleSin +
        point.row * angleCos +
        (1 - angleCos) * rotationCenter.row -
        rotationCenter.column * angleSin;
    return { column, row };
}
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