Function _getRelativeEdgeDifference

docs/app/js/sanddance-app.js:31792–31795

(rect, hostRect, edge)

    return _getRelativeEdgeValue(edge, _getEdgeValue(rect, edge));
}
function _getRelativeEdgeDifference(rect, hostRect, edge) {
    var edgeDifference = _getEdgeValue(rect, edge) - _getEdgeValue(hostRect, edge);
    return _getRelativeEdgeValue(edge, edgeDifference);
}
/**
 * Moves the edge of a rectangle to the value given. It only moves the edge in a linear direction based on that edge.
 * For example, if it's a bottom edge it will only change y coordinates.