Plot Markers (ligo.skymap.plot.marker)

ligo.skymap.plot.marker.earth = Path(array([[ 0.        , -1.        ],        [ 0.2652031 , -1.        ],        [ 0.51957987, -0.89463369],        [ 0.70710678, -0.70710678],        [ 0.89463369, -0.51957987],        [ 1.        , -0.2652031 ],        [ 1.        ,  0.        ],        [ 1.        ,  0.2652031 ],        [ 0.89463369,  0.51957987],        [ 0.70710678,  0.70710678],        [ 0.51957987,  0.89463369],        [ 0.2652031 ,  1.        ],        [ 0.        ,  1.        ],        [-0.2652031 ,  1.        ],        [-0.51957987,  0.89463369],        [-0.70710678,  0.70710678],        [-0.89463369,  0.51957987],        [-1.        ,  0.2652031 ],        [-1.        ,  0.        ],        [-1.        , -0.2652031 ],        [-0.89463369, -0.51957987],        [-0.70710678, -0.70710678],        [-0.51957987, -0.89463369],        [-0.2652031 , -1.        ],        [ 0.        , -1.        ],        [ 0.        , -1.        ],        [-1.        ,  0.        ],        [ 1.        ,  0.        ],        [ 0.        , -1.        ],        [ 0.        ,  1.        ]]), array([ 1,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,         4,  4,  4,  4,  4,  4,  4,  4, 79,  1,  2,  1,  2], dtype=uint8))

The Earth symbol (circle and cross).

Examples

from matplotlib import pyplot as plt
from ligo.skymap.plot.marker import earth

plt.plot(0, 0, markersize=20, markeredgewidth=2,
         markerfacecolor='none', marker=earth)

(Source code, png, hires.png, pdf)

Specialized markers.

ligo.skymap.plot.marker.reticle(inner=0.5, outer=1.0, angle=0.0, which='lrtb')

Create a reticle or crosshairs marker.

Parameters:

innerfloat

Distance from the origin to the inside of the crosshairs.

outerfloat

Distance from the origin to the outside of the crosshairs.

anglefloat

Rotation in degrees; 0 for a ‘+’ orientation and 45 for ‘x’.

Returns:

pathmatplotlib.path.Path

The new marker path, suitable for passing to Matplotlib functions (e.g., plt.plot(..., marker=reticle()))

Examples

from matplotlib import pyplot as plt
from ligo.skymap.plot.marker import reticle

markers = [reticle(inner=0),
           reticle(which='lt'),
           reticle(which='lt', angle=45)]

fig, ax = plt.subplots(figsize=(6, 2))
ax.set_xlim(-0.5, 2.5)
ax.set_ylim(-0.5, 0.5)
for x, marker in enumerate(markers):
    ax.plot(x, 0, markersize=20, markeredgewidth=2, marker=marker)

(Source code, png, hires.png, pdf)