SphericalCircle¶
-
class
astropy.visualization.wcsaxes.
SphericalCircle
(center, radius, resolution=100, vertex_unit=Unit('deg'), **kwargs)[source]¶ 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
- centertuple 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
- resolutionint, 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.
- centertuple or
Notes
Additional keyword arguments are passed to
Polygon
xy is a numpy array with shape Nx2.
If closed is True, the polygon will be closed so the starting and ending points are the same.
Valid keyword arguments are:
- Properties:
agg_filter: a filter function, which takes a (m, n, 3) float array and a dpi value, and returns a (m, n, 3) array alpha: float or None animated: bool antialiased or aa: unknown capstyle: {‘butt’, ‘round’, ‘projecting’} clip_box:
Bbox
clip_on: bool clip_path: Patch or (Path, Transform) or None color: color contains: callable edgecolor or ec: color or None or ‘auto’ facecolor or fc: color or None figure:Figure
fill: bool gid: str hatch: {‘/’, ‘', ‘|’, ‘-‘, ‘+’, ‘x’, ‘o’, ‘O’, ‘.’, ‘*’} in_layout: bool joinstyle: {‘miter’, ‘round’, ‘bevel’} label: object linestyle or ls: {‘-‘, ‘–’, ‘-.’, ‘:’, ‘’, (offset, on-off-seq), …} linewidth or lw: float or None path_effects:AbstractPathEffect
picker: None or bool or float or callable rasterized: bool or None sketch_params: (scale: float, length: float, randomness: float) snap: bool or None transform:Transform
url: str visible: bool zorder: float