cairo:pattern-linear-points (pattern)

pattern -- a cairo:pattern-t instance

x0 -- a number for the x coordinate of the first point
y0 -- a number for the y coordinate of the first point
y0 -- a number for the x coordinate of the second point
y1 -- a number for the y coordinate of the second point

Gets the gradient endpoints for a linear gradient. Returns nil if the pattern is not a linear gradient pattern. The numbers returned are double floats.