const OFFSET_DISTANCE = 20;
/**
 * Measures the distance between two points in a 2D space.
 */ export function measureDistance(a, b) {
    return Math.sqrt((a[0] - b[0]) ** 2 + (a[1] - b[1]) ** 2);
}
/**
 * Returns a unit vector pointing from point `b` to point `a`.
 * If the distance is zero, returns a zero vector.
 */ export function getUnitVector(a, b) {
    const distance = measureDistance(a, b);
    if (distance === 0) {
        return [
            0,
            0
        ];
    }
    return [
        (a[0] - b[0]) / distance,
        (a[1] - b[1]) / distance
    ];
}
/**
 * Calculates the anchor point for a mouse position within a container defined by its top-left and bottom-right corners.
 * The anchor point is calculated as an offset from the center of the container in the direction of the mouse position.
 *
 * @internal
 */ export function getMouseAnchor(topLeftCorner, bottomRightCorner, mouseCoordinates) {
    const containerCenter = [
        (topLeftCorner[0] + bottomRightCorner[0]) / 2,
        (topLeftCorner[1] + bottomRightCorner[1]) / 2
    ];
    const unitVector = getUnitVector([
        mouseCoordinates[0],
        mouseCoordinates[1]
    ], [
        containerCenter[0],
        containerCenter[1]
    ]);
    const distance = measureDistance([
        containerCenter[0],
        containerCenter[1]
    ], [
        mouseCoordinates[0],
        mouseCoordinates[1]
    ]);
    return [
        containerCenter[0] + unitVector[0] * (distance + OFFSET_DISTANCE),
        containerCenter[1] + unitVector[1] * (distance + OFFSET_DISTANCE)
    ];
}