# XWUIChartWaterfall

A waterfall chart backed by `XWUIChart` that walks a running total through successive positive and negative steps, used to show how an opening value builds to a closing one. Provide named `series` of `{ x, y }` deltas and pick a `block` (1-4) variant plus a `size` preset; legend and grid auto-toggle per block unless overridden.

## Basic Usage

Two named monthly series - `Series A` (30→64) and `Series B` (22→52) across Jan-Jun - accumulated as a running total of steps.

```example
file: examples/BasicUsage.ts
html: examples/BasicUsage.html
title: Basic Usage
description: Two monthly series drawn as a waterfall chart at the md preset.
```

## Quarterly Profit Bridge

A P&L bridge walking gross revenue down through cost lines to net profit for the quarter.

```example
file: examples/QuarterlyProfit.ts
html: examples/QuarterlyProfit.html
title: Quarterly Profit Bridge
description: Revenue stepped down through COGS, salaries, and opex to net profit with dollar labels.
```

## Annual Headcount Flow

A year of team-size changes - hires and backfills up, attrition and a reorg down - to a closing count.

```example
file: examples/HeadcountFlow.ts
html: examples/HeadcountFlow.html
title: Annual Headcount Flow
description: Engineering headcount walking from 84 to 94 FTE through hires, attrition, and a reorg.
```

```api
```