This function returns the circumcircle of a triangle.
Usage
circum(x, y)
Value
x
'x' coordinate of center
y
'y' coordinate of center
radius
circumcircle radius
signed.area
signed area of riangle (positive iff nodes are
numbered counter clock wise)
aspect.ratio
ratio "radius of inscribed circle"/"radius of
circumcircle", varies between 0 and 0.5
0 means collinear points, 0.5 equilateral trangle.
Arguments
x
Vector of three elements, giving the x coordinatres of the
triangle nodes.
y
Vector of three elements, giving the y coordinatres of the
triangle nodes.
Author
Fortran code: R. J. Renka, R code: A. Gebhardt
Details
This is an interface to the Fortran function CIRCUM found in TRIPACK.
References
R. J. Renka (1996). Algorithm 751: TRIPACK: a constrained
two-dimensional Delaunay triangulation package.
ACM Transactions on Mathematical Software.
22, 1-8.