Vertical concatenation

Two related views are stacked vertically while sharing the same input table.

Code

"""Vertical concatenation.

Two related views are stacked vertically while sharing the same input table.
"""

import genome_spy as gs
from genome_spy.datasets._grammar import sincos_data


# Load example positions for both charts.
data = sincos_data()

# Draw a sine wave in the upper chart.
sin_chart = (
    gs.Chart(data)
    .transform_formula(expr=gs.expr.sin(gs.datum.x / 4), as_="value")
    .mark_point(size=45)
    .encode(
        x=gs.X("x:Q").scale(zoom=True),
        y=gs.Y("value:Q").scale(zoom=True).title("sin"),
    )
    .with_view(stroke="lightgray")
)
# Draw a cosine wave in red for the lower chart.
cos_chart = (
    gs.Chart(data)
    .transform_formula(expr=gs.expr.cos(gs.datum.x / 5), as_="value")
    .mark_point(size=45, color="#c53b2c")
    .encode(
        x=gs.X("x:Q").scale(zoom=True).title("Position"),
        y=gs.Y("value:Q").scale(zoom=True).title("cos"),
    )
    .with_view(stroke="lightgray")
)

# Stack the two charts with a little space between them.
chart = gs.vconcat(sin_chart, cos_chart, spacing=20).properties(
    title="Vertical concatenation"
)

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