lsst.geom.geometry.SphericalEllipse Class Reference

Inheritance diagram for lsst.geom.geometry.SphericalEllipse:

Public Member Functions
def	__init__
def	getBoundingBox
def	getBoundingCircle
def	getInnerCircle
def	getCenter
def	getMajorAxisAngle
def	getSemiMajorAxisLength
def	getSemiMinorAxisLength
def	contains
def	intersects
def	__repr__
def	__eq__

Public Attributes
	center
	semiMajorAxisLength
	semiMinorAxisLength
	majorAxisAngle
	boundingCircle
	innerCircle

Private Member Functions
def	_containsPoint

Detailed Description

An ellipse on the unit sphere. This is a standard 2D cartesian
ellipse defined on the plane tangent to the unit sphere at the ellipse
center and then orthographically projected onto the surface of the
unit sphere.

Definition at line 931 of file geometry.py.

Constructor & Destructor Documentation

def lsst.geom.geometry.SphericalEllipse.__init__	(		self,
			center,
			semiMajorAxisLength,
			semiMinorAxisLength,
			majorAxisAngle
	)

Definition at line 938 of file geometry.py.

                 semiMajorAxisLength, semiMinorAxisLength, majorAxisAngle):
        self.center = sphericalCoords(center)
        self.semiMajorAxisLength = float(semiMajorAxisLength)
        self.semiMinorAxisLength = float(semiMinorAxisLength)
        a = math.fmod(float(majorAxisAngle), 180.0)
        if a < 0.0:
            a += 180.0
        self.majorAxisAngle = a
        self.boundingCircle = None
        self.innerCircle = None
        if self.semiMinorAxisLength < 0.0:
            raise RuntimeError('Negative semi-minor axis length')
        if self.semiMajorAxisLength < self.semiMinorAxisLength:
            raise RuntimeError(
                'Semi-major axis length is less than semi-minor axis length')
        # large spherical ellipses don't make much sense
        if self.semiMajorAxisLength > 10.0 * ARCSEC_PER_DEG:
            raise RuntimeError(
                'Semi-major axis length must be less than or equal to 10 deg')
        self.center = (reduceTheta(self.center[0]), self.center[1])