# XWUIChartHeatmap

A heatmap chart variant backed by `XWUIChart` that colors each cell of a grid by its value, the classic way to surface clusters, hotspots, and patterns across two categorical axes. Supply one named `series` per grid row, each carrying its cells as `{ x, y }` points (column label and value), then choose a `block` (1-4) and `size` preset.

## Basic Usage

Five named rows, each with seven randomized cell values, forming a 5x7 colored grid.

```example
file: examples/BasicUsage.ts
html: examples/BasicUsage.html
title: Basic Usage
description: A 5x7 grid of randomized values rendered as a heatmap at the md preset.
```

## Week x Hour Activity

A 7x24 (168-cell) activity grid shaded by session count - bright across weekday working
hours and dim overnight and on weekends.

```example
file: examples/WeekHours.ts
html: examples/WeekHours.html
title: Week x Hour Activity
description: A 168-cell weekly activity heatmap, brightest during weekday business hours.
```

## Feature Correlation Matrix

A symmetric 8x8 correlation grid over eight features, with a bright diagonal marking each
feature's perfect self-correlation.

```example
file: examples/CorrelationMatrix.ts
html: examples/CorrelationMatrix.html
title: Feature Correlation Matrix
description: An 8x8 feature correlation grid flattened into a clean 64-cell square.
```

## 2D Density Grid

A 12x12 binned density heatmap with a Gaussian hotspot fading toward the edges, showing
where 2D samples concentrate.

```example
file: examples/Density.ts
html: examples/Density.html
title: 2D Density Grid
description: A 144-cell density grid with a Gaussian peak that fades radially outward.
```

```api
```