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44 lines
1.2 KiB
Python
44 lines
1.2 KiB
Python
"""
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Candlestick Chart
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=================
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A candlestick chart inspired from `Protovis <http://mbostock.github.io/protovis/ex/candlestick.html>`_.
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This example shows the performance of the Chicago Board Options Exchange `Volatility Index <https://en.wikipedia.org/wiki/VIX>`_ (VIX)
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in the summer of 2009. The thick bar represents the opening and closing prices,
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while the thin bar shows intraday high and low prices; if the index closed higher on a given day, the bars are colored green rather than red.
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"""
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# category: other charts
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import altair as alt
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from vega_datasets import data
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source = data.ohlc()
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open_close_color = alt.condition("datum.open <= datum.close",
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alt.value("#06982d"),
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alt.value("#ae1325"))
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base = alt.Chart(source).encode(
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alt.X('date:T',
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axis=alt.Axis(
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format='%m/%d',
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labelAngle=-45,
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title='Date in 2009'
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)
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),
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color=open_close_color
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)
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rule = base.mark_rule().encode(
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alt.Y(
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'low:Q',
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title='Price',
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scale=alt.Scale(zero=False),
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),
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alt.Y2('high:Q')
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)
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bar = base.mark_bar().encode(
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alt.Y('open:Q'),
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alt.Y2('close:Q')
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)
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rule + bar |