from starplot import Constellation, MapPlot, StereoNorth, _

from starplot.styles import GradientStyle, PlotStyle, extensions

style = PlotStyle().extend(

extensions.BLUE_NIGHT,

extensions.MAP,

)

# define your gradient and apply it to the axes background

style.axes.background.fill = GradientStyle(

stops=(

(0.0, "#f4d58d"),

(0.3, "#c17ecb"),

(0.7, "#4b3f8f"),

(1.0, "#100d29"), # last stop should always be 1.0

),

type="linear",

)

cas = Constellation.get(iau_id="cas")

p = MapPlot(

projection=StereoNorth(center_ra=15),

ra_min=-5,

ra_max=35,

dec_min=55,

dec_max=65,

style=style,

scale=1.5,

)

p.stars(

where=[_.hip.isin(cas.star_hip_ids)],

where_labels=False,

style__marker__symbol="star_4",

style__marker__stroke_width=4,

size_fn=lambda s: 80,

)

p.constellations()

p.export("gradient.svg")