SphericalCircle¶
-
class
astropy.visualization.wcsaxes.
SphericalCircle
(center, radius, resolution=100, vertex_unit=Unit("deg"), **kwargs)[source] [edit on github]¶ Bases:
matplotlib.patches.Polygon
Create a patch representing a spherical circle - that is, a circle that is formed of all the points that are within a certain angle of the central coordinates on a sphere. Here we assume that latitude goes from -90 to +90
This class is needed in cases where the user wants to add a circular patch to a celestial image, since otherwise the circle will be distorted, because a fixed interval in longitude corresponds to a different angle on the sky depending on the latitude.
Parameters: - center : tuple or
Quantity
This can be either a tuple of two
Quantity
objects, or a singleQuantity
array with two elements.- radius :
Quantity
The radius of the circle
- resolution : int, optional
The number of points that make up the circle - increase this to get a smoother circle.
- vertex_unit :
Unit
The units in which the resulting polygon should be defined - this should match the unit that the transformation (e.g. the WCS transformation) expects as input.
Notes
Additional keyword arguments are passed to
Polygon
- center : tuple or