# XWUIChartIsopleth

An isopleth chart variant backed by `XWUIChart` that connects points of equal value with contour lines over a continuous field, the mapping technique behind isotherms, isobars, and similar equal-value curves. Provide named `series` of `{ x, y }` points and choose a `block` (1-4) and `size` preset.

## Basic Usage

Two named monthly series (Series A and Series B), each spanning Jan through Jun, supplied as the isopleth sample data.

```example
file: examples/BasicUsage.ts
html: examples/BasicUsage.html
title: Basic Usage
description: Two six-month series rendered as an isopleth chart at the md preset.
```

## Terrain Elevation

Elevation profiles along three parallel survey transects, each iso-line tracing the same ridge crest at a different offset.

```example
file: examples/TerrainElevation.ts
html: examples/TerrainElevation.html
title: Terrain Elevation
description: Three survey transects as elevation iso-lines over distance.
```

## Temperature Gradient

Isotherm lines for three altitude bands across a span of latitudes, showing each elevation cooling toward the pole.

```example
file: examples/TemperatureGradient.ts
html: examples/TemperatureGradient.html
title: Temperature Gradient
description: Mean temperature isotherms by latitude for three altitudes.
```

```api
```