def GetRadiusPointFromExt(self, x, y):
"""
get The intersecrion point from the line(x,y,cx,cy) and the circle
"""
_cx, _cy = self.center.getCoords()
_r = self.radius
centerPoint = Point(_cx, _cy)
outPoint = Point(x, y)
vector = Vector(outPoint, centerPoint)
vNorm = vector.Norm()
newNorm = abs(vNorm - _r)
magVector = vector.Mag()
magVector.Mult(newNorm)
newPoint = magVector.Point()
intPoint = Point(outPoint + newPoint)
return intPoint.getCoords()
