Jupyter Scatter

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Annotations ​

To help navigating and relating points and clusters, Jupyter Scatter offers annotations such a lines and rectangles.

INFO

Currently, Jupyter Scatter supports line-based annotations only. In the future, we plan to add support for text annotations as well.

Line, HLine, VLine, and Rect ​

To draw annotations, create instances of Line, HLine, VLine, or Rect. You can then either pass the annotations into the constructor, as shown below, or call scatter.annotations().

py
import jscatter
import numpy as np

x1, y1 = np.random.normal(-1, 0.2, 1000), np.random.normal(+1, 0.05, 1000)
x2, y2 = np.random.normal(+1, 0.2, 1000), np.random.normal(+1, 0.05, 1000)
x3, y3 = np.random.normal(+1, 0.2, 1000), np.random.normal(-1, 0.05, 1000)
x4, y4 = np.random.normal(-1, 0.2, 1000), np.random.normal(-1, 0.05, 1000)

y0 = jscatter.HLine(0)
x0 = jscatter.VLine(0)
c1 = jscatter.Rect(x_start=-1.5, x_end=-0.5, y_start=+0.75, y_end=+1.25)
c2 = jscatter.Rect(x_start=+0.5, x_end=+1.5, y_start=+0.75, y_end=+1.25)
c3 = jscatter.Rect(x_start=+0.5, x_end=+1.5, y_start=-1.25, y_end=-0.75)
c4 = jscatter.Rect(x_start=-1.5, x_end=-0.5, y_start=-1.25, y_end=-0.75)
l = jscatter.Line([
    (-2, -2), (-1.75, -1), (-1.25, -0.5), (1.25, 0.5), (1.75, 1), (2, 2)
])

scatter = jscatter.Scatter(
    x=np.concatenate((x1, x2, x3, x4)), x_scale=(-2, 2),
    y=np.concatenate((y1, y2, y3, y4)), y_scale=(-2, 2),
    annotations=[x0, y0, c1, c2, c3, c4, l],
    width=400,
    height=400,
)
scatter.show()

Line Color & Width ​

You can customize the line color and width of Line, HLine, VLine, or Rect via the line_color and line_width attributes.

py
y0 = jscatter.HLine(0, line_color=(0, 0, 0, 0.1))
x0 = jscatter.VLine(0, line_color=(0, 0, 0, 0.1))
c1 = jscatter.Rect(x_start=-1.5, x_end=-0.5, y_start=+0.75, y_end=+1.25, line_color="#56B4E9", line_width=2)
c2 = jscatter.Rect(x_start=+0.5, x_end=+1.5, y_start=+0.75, y_end=+1.25, line_color="#56B4E9", line_width=2)
c3 = jscatter.Rect(x_start=+0.5, x_end=+1.5, y_start=-1.25, y_end=-0.75, line_color="#56B4E9", line_width=2)
c4 = jscatter.Rect(x_start=-1.5, x_end=-0.5, y_start=-1.25, y_end=-0.75, line_color="#56B4E9", line_width=2)
l = jscatter.Line(
    [(-2, -2), (-1.75, -1), (-1.25, -0.5), (1.25, 0.5), (1.75, 1), (2, 2)],
    line_color="red",
    line_width=3
)

Contour Line ​

Beyond basic line-based annotations, Jupyter Scatter also supports composite annotations like contour line.

A contour line estimates the density and is internally computed with Seaborn's kdeplot.

py
import jscatter
import seaborn as sns

jscatter.plot(
    data=sns.load_dataset("geyser"),
    x='waiting',
    y='duration',
    annotations=[jscatter.Contour()],
)

To draw contour lines by a group of points, you can use the by argument of Contour. Internally, the by property maps to the hue argument of the kdeplot. When color_by is the same as the Contour's by property, the color of the contour lines match the color of the points.

py
jscatter.plot(
    data=sns.load_dataset("geyser"),
    x='waiting',
    y='duration',
    color_by='kind',
    annotations=[jscatter.Contour(by='kind')],
)

To emphasize higher levels and deemphasize lower levels of the contour lines, you can set the line_opacity_by_level argument to True.

py
jscatter.plot(
    data=sns.load_dataset("geyser"),
    x='waiting',
    y='duration',
    color_by='kind',
    annotations=[jscatter.Contour(by='kind', line_opacity_by_level=True)],
)