docs: demo custom Y-axis label formatting (issue #256)#987
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…sue #256) Issue #256 asked to override the whole Y-axis label formatting (beyond the decimal pattern), e.g. to apply time/date formatting to Y values. This is already supported via AxesChartStyler.setYAxisTickLabelsFormattingFunction(Function<Double,String>), which routes through AxisTickCalculator_Callback -> Formatter_Custom and fully replaces the default numeric formatting. Add a how-to demo rendering epoch-millis Y values as HH:mm time-of-day labels. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Closes #256.
Context
Issue #256 requested the ability to "override the whole label formatting" of the Y-axis (beyond the decimal pattern), e.g. to apply time/date formatting to Y values.
Finding: already supported
AxesChartStyler.setYAxisTickLabelsFormattingFunction(Function<Double, String>)(and the convenienceAxesChart.setCustomYAxisTickLabelsFormatter(...)) completely replaces the default numeric formatting. The function receives each raw tick value and returns the label string.Wiring:
Axis_Y.getAxisTickCalculatorselectsAxisTickCalculator_Callback(orAxisTickCalculator_Logarithmicfor log/non-Date axes) when the function is set.Formatter_Custominvokes the user function per tick, bypassing the decimal pattern entirely.The symmetric X-axis hook (
setXAxisTickLabelsFormattingFunction) already existed as well.This PR
Adds a how-to demo,
TestForIssue256, that plots epoch-millis Y values and renders them asHH:mmtime-of-day labels via aSimpleDateFormat— the reporter's exact use case. No library code change is needed.Verified headless: the Y-axis renders
01:00,01:08,01:16, …🤖 Generated with Claude Code