Scatter Plot Color Slicing

Example showing color slice for scatter plot.

/home/runner/work/fastplotlib/fastplotlib/fastplotlib/graphics/_features/_base.py:18: UserWarning: casting float64 array to float32
  warn(f"casting {array.dtype} array to float32")

# test_example = false

import fastplotlib as fpl
import numpy as np

figure = fpl.Figure(size=(700, 560))

# create a random distribution of 10,000 xyz coordinates
n_points = 5_000

# dimensions always have to be [n_points, xyz]
dims = (n_points, 3)

clouds_offset = 30

# create some random clouds
normal = np.random.normal(size=dims, scale=5)
# stack the data into a single array
cloud = np.vstack(
    [
        normal - clouds_offset,
        normal,
        normal + clouds_offset,
    ]
)

# color each of them separately
colors = ["yellow"] * n_points + ["cyan"] * n_points + ["magenta"] * n_points

# use an alpha value since this will be a lot of points
figure[0,0].add_scatter(data=cloud, sizes=3, colors=colors, alpha=0.6)

figure.show()

scatter_graphic = figure[0, 0].graphics[0]

scatter_graphic.colors[0:75] = "red"
scatter_graphic.colors[75:150] = "white"
scatter_graphic.colors[::2] = "blue"

# NOTE: `if __name__ == "__main__"` is NOT how to use fastplotlib interactively
# please see our docs for using fastplotlib interactively in ipython and jupyter
if __name__ == "__main__":
    print(__doc__)
    fpl.run()