# XWUIChartSurface

A surface chart: a fixed-type wrapper around `XWUIChart` that renders a grid of series values as a continuous surface, shading height/value across two dimensions. Supply `{ series }` (each series a row of `{ x, y }` cells) plus a `block` preset (1-4) and `size`. Use it to show how a metric varies across a two-dimensional field as a smooth shaded surface.

## Basic Usage

Two series (Series A and Series B) of six monthly values, Jan through Jun, treated as grid rows and rendered at medium size as a single continuous shaded surface.

```example
file: examples/BasicUsage.ts
html: examples/BasicUsage.html
title: Basic Usage
description: Two monthly series read as grid rows and shaded into one continuous surface across the field.
```

## Terrain Elevation

Elevation profiles from three parallel transects across a mountain pass, shaded into one surface so the central peak and the valley dip read at a glance.

```example
file: examples/TerrainElevation.ts
html: examples/TerrainElevation.html
title: Terrain Elevation
description: Three mountain-pass transects sampled at shared distance markers and shaded into one elevation surface.
```

## Wi-Fi Coverage Map

Wi-Fi signal strength in dBm sampled along each floor's corridor, rendered as an interactive coverage surface with a crosshair so dead spots stand out.

```example
file: examples/WifiCoverage.ts
html: examples/WifiCoverage.html
title: Wi-Fi Coverage Map
description: Per-floor signal-strength readings shaded into an interactive coverage surface with crosshair.
```

```api
```