ABPCMS.Web/lib/chart.js/docs/configuration/legend.md

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# Legend Configuration

The chart legend displays data about the datasets that area appearing on the chart.

## Configuration options
The legend configuration is passed into the `options.legend` namespace. The global options for the chart legend is defined in `Chart.defaults.global.legend`.

| Name | Type | Default | Description
| -----| ---- | --------| -----------
| `display` | `Boolean` | `true` | is the legend shown
| `position` | `String` | `'top'` | Position of the legend. [more...](#position)
| `fullWidth` | `Boolean` | `true` | Marks that this box should take the full width of the canvas (pushing down other boxes). This is unlikely to need to be changed in day-to-day use.
| `onClick` | `Function` | | A callback that is called when a click event is registered on a label item 
| `onHover` | `Function` | | A callback that is called when a 'mousemove' event is registered on top of a label item
| `reverse` | `Boolean` | `false` | Legend will show datasets in reverse order.
| `labels` | `Object` | | See the [Legend Label Configuration](#legend-label-configuration) section below.

## Position
Position of the legend. Options are:
* `'top'`
* `'left'`
* `'bottom'`
* `'right'`

## Legend Label Configuration

The legend label configuration is nested below the legend configuration using the `labels` key.

| Name | Type | Default | Description
| -----| ---- | --------| -----------
| `boxWidth` | `Number` | `40` | width of coloured box
| `fontSize` | `Number` | `12` | font size of text
| `fontStyle` | `String` | `'normal'` | font style of text
| `fontColor` | Color | `'#666'` | Color of text
| `fontFamily` | `String` | `"'Helvetica Neue', 'Helvetica', 'Arial', sans-serif"` | Font family of legend text.
| `padding` | `Number` | `10` | Padding between rows of colored boxes.
| `generateLabels` | `Function` | | Generates legend items for each thing in the legend. Default implementation returns the text + styling for the color box. See [Legend Item](#chart-configuration-legend-item-interface) for details.
| `filter` | `Function` | `null` | Filters legend items out of the legend. Receives 2 parameters, a [Legend Item](#chart-configuration-legend-item-interface) and the chart data.
| `usePointStyle` | `Boolean` | `false` | Label style will match corresponding point style (size is based on fontSize, boxWidth is not used in this case).

## Legend Item Interface

Items passed to the legend `onClick` function are the ones returned from `labels.generateLabels`. These items must implement the following interface.

```javascript
{
    // Label that will be displayed
    text: String,

    // Fill style of the legend box
    fillStyle: Color,

    // If true, this item represents a hidden dataset. Label will be rendered with a strike-through effect
    hidden: Boolean,

    // For box border. See https://developer.mozilla.org/en/docs/Web/API/CanvasRenderingContext2D/lineCap
    lineCap: String,

    // For box border. See https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash
    lineDash: Array[Number],