Gauge#

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import panel as pn

pn.extension('echarts')

The Gauge is a value indicator providing a visual representation of a value as a gauge or speed-o-meter. The Gauge is rendered using the ECharts library so when working in the notebook, ensure you load ‘echarts’ in pn.extension.

Parameters:#

For details on other options for customizing the component see the layout and styling how-to guides.

annulus_width (int, default=10): Width of the gauge annulus.
bounds (tuple, default=(0, 100)): The upper and lower bound of the dial.
colors (list): Color thresholds for the Gauge, specified as a list of tuples of the fractional threshold and the color to switch to.
custom_opts (dict): Additional options to pass to the ECharts Gauge definition.
end_angle (float or int, default=-45) Angle at which the gauge ends.
format str(str, default=’{value}%’): Formatting string for the value indicator.
num_splits (int, default=10): Number of splits along the gauge.
show_ticks (boolean, default=True): Whether to show ticks along the dials.
show_labels (boolean, default=True): Whether to show tick labels along the dials.
start_angle (float or int, default=225): Angle at which the gauge starts.
tooltip_format (str, default=’{b} : {c}%’): Formatting string for the hover tooltip.
title_size (int, default=18): Size of title font.
value (float or int, default=25): Value to indicate on the gauge a value within the declared bounds.

The simplest form of a Gauge just requires setting a value which must be within the bounds. The default formatter and bounds assume you are providing a percentage:

pn.indicators.Gauge(name='Failure Rate', value=10, bounds=(0, 100))

If we want to display some other value such as the revolutions per minute of an engine we can set a different bounds value and override the format. Additionally we may also provide a different set of colors defining the threshold points at which the color should change as a fraction of the provided bounds. The colors accepts a list of tuples defining the fractions and the color:

pn.indicators.Gauge(
    name='Engine', value=2500, bounds=(0, 3000), format='{value} rpm',
    colors=[(0.2, 'green'), (0.8, 'gold'), (1, 'red')]
)

You can also change the color of the needle by passing custom options:

pn.indicators.Gauge(
    name="Engine", value=2500, bounds=(0, 3000), format='{value} rpm',
    colors=[(0.2, 'green'), (0.8, 'gold'), (1, 'red')],
    custom_opts={"pointer": {"itemStyle": {"color": 'red'}}}
)

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