Rect heatmap

A dense quantitative grid rendered with rect marks and a continuous color scale.

Code

"""Rect heatmap.

A dense quantitative grid rendered with rect marks and a continuous color
scale.
"""

import genome_spy as gs
from genome_spy.datasets._grammar import heatmap_data
from genome_spy.schema import Scale


# Load a small grid of example values.
data = heatmap_data()

# Draw one colored tile per cell, with color showing its value.
chart = (
    gs.Chart(data)
    .mark_rect()
    .encode(
        x=gs.X("x:O").axis(None),
        y=gs.Y("y:O").axis(None),
        color=gs.Color("z:Q").scale(Scale(scheme="magma")).title("value"),
    )
    .properties(title="Rect heatmap")
)

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