Function isInside( x, y, xys, ... )

Description:
Indicates whether a given test point is inside a polygon defined by specified list of vertices. The vertices are specified as a sequence of Xi, Yi pairs.

If the number of coordinates is odd, the behaviour is not defined.

Parameters:
x (floating point)
X coordinate of test point
y (floating point)
Y coordinate of test point
xys (floating point, one or more)
2N arguments (x1, y1, x2, y2, ..., xN, yN) giving vertices of an N-sided polygon
Return Value (boolean):
true iff test point is inside, or on the border of, the polygon
Examples:
Signature:
boolean isInside(double, double, double...)