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/**
 * Coordinate addition
 * @param a The first coordinate
 * @param b The second coordinate
 */
export function add(a, b) {
    return {
        x: a.x + b.x,
        y: a.y + b.y,
    };
}
/**
 * Coordinate subtraction
 * @param a The first coordinate
 * @param b The second coordinate
 */
export function subtract(a, b) {
    return {
        x: a.x - b.x,
        y: a.y - b.y,
    };
}
/**
 * Returns the cartesian distance of the drag source component's position, based on its position
 * at the time when the current drag operation has started, and the movement difference.
 *
 * Returns null if no item is being dragged.
 *
 * @param state The offset state to compute from
 */
export function getSourceClientOffset(state) {
    const { clientOffset, initialClientOffset, initialSourceClientOffset } = state;
    if (!clientOffset || !initialClientOffset || !initialSourceClientOffset) {
        return null;
    }
    return subtract(add(clientOffset, initialSourceClientOffset), initialClientOffset);
}
/**
 * Determines the x,y offset between the client offset and the initial client offset
 *
 * @param state The offset state to compute from
 */
export function getDifferenceFromInitialOffset(state) {
    const { clientOffset, initialClientOffset } = state;
    if (!clientOffset || !initialClientOffset) {
        return null;
    }
    return subtract(clientOffset, initialClientOffset);
}