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fix: hourly canvas chart date labels #9513

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fix: hourly canvas chart date labels #9513

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17 changes: 17 additions & 0 deletions web-common/src/features/components/charts/builder.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,10 @@ export function createPositionEncoding(
): PositionFieldDef<Field> {
if (!field || field.type === "value") return {};
const metaData = data.fields[field.field];
const temporalAxisLabelExpr =
field.type === "temporal" && metaData && "format" in metaData
? getTemporalAxisLabelExpr(metaData.format)
: undefined;
return {
field: sanitizeValueForVega(field.field),
title: metaData?.displayName || field.field,
Expand Down Expand Up @@ -115,11 +119,24 @@ export function createPositionEncoding(
"format" in metaData && {
format: metaData.format,
}),
...(temporalAxisLabelExpr && {
labelExpr: temporalAxisLabelExpr,
}),
...(!field.showAxisTitle && { title: null }),
},
};
}

export function getTemporalAxisLabelExpr(format: string | undefined) {
if (format !== "%H:%M") return undefined;

return [
"timeFormat(datum.value, '%H:%M') === '00:00'",
"? timeFormat(datum.value, '%b %d')",
": timeFormat(datum.value, '%H:%M')",
].join(" ");
}

export function createSizeEncoding(
field: FieldConfig | undefined,
data: ChartDataResult,
Expand Down
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