distancePointLine

Determine the signed distance of the given point <code>(pointX, pointY)</code> to the line defined by the two points <code>(x0, y0)</code> and <code>(x1, y1)</code>. <p> Reference: <a href="http://mathworld.wolfram.com/Point-LineDistance2-Dimensional.html">http://mathworld.wolfram.com</a>

@param pointX the x coordinate of the point @param pointY the y coordinate of the point @param x0 the x coordinate of the first point on the line @param y0 the y coordinate of the first point on the line @param x1 the x coordinate of the second point on the line @param y1 the y coordinate of the second point on the line @return the distance between the point and the line