Module chart_data 

Prepare chart data from LazyFrame: select x/y columns, collect, and convert to (f64, f64) points. All prepare_* and collect_* functions take a row_limit to cap materialized rows (default from config).

Structs

BoxPlotData

BoxPlotStats

Box plot stats for a column.

ChartDataResult

Result of preparing chart data: series points and x-axis kind for label formatting.

ChartXRangeResult

Result of loading only the x column: min/max for axis bounds and temporal kind.

HeatmapData

Heatmap data for two numeric columns.

HistogramBin

Histogram bin (center and count).

HistogramData

Histogram data for a single column.

KdeData

KdeSeries

KDE series and bounds.

Enums

XAxisTemporalKind

Describes how x-axis numeric values map to temporal types for label formatting.

Functions

format_axis_label

Format a numeric axis tick (for y-axis or generic numeric).

format_x_axis_label

Format x-axis tick: dates/datetimes/times when kind is temporal, else numeric. Used by chart widget and export.

prepare_box_plot_data

Prepare box plot stats for one or more numeric columns. Uses a single collect for all columns.

prepare_chart_data

Prepares chart data from the current LazyFrame. Returns series data and x-axis kind. X is cast to f64 (temporal types as ordinal). Drops nulls and limits to row_limit rows.

prepare_chart_x_range

Loads only the x column and returns its min/max (for axis display when no y is selected). Limits to row_limit rows then scans for min/max (single column materialized).

prepare_heatmap_data

Prepare heatmap data for two numeric columns.

prepare_histogram_data

Prepare histogram data for a numeric column.

prepare_kde_data

Prepare KDE data for one or more numeric columns. Uses a single collect for all columns.

x_axis_temporal_kind_for_column

Returns the x-axis temporal kind for a column from the schema (for axis label formatting when no data is loaded yet).