chartjs-node-canvas/API.md

A node renderer for Chart.js using canvas.

<a name="CanvasRenderService"></a>

## CanvasRenderService
**Kind**: global class  

* [CanvasRenderService](#CanvasRenderService)
    * [new CanvasRenderService(width, height, chartCallback, type)](#new_CanvasRenderService_new)
    * [.renderToDataURL(configuration, mimeType)](#CanvasRenderService+renderToDataURL)
    * [.renderToBuffer(configuration, mimeType)](#CanvasRenderService+renderToBuffer)
    * [.renderToStream(configuration, mimeType)](#CanvasRenderService+renderToStream)

<a name="new_CanvasRenderService_new"></a>

### new CanvasRenderService(width, height, chartCallback, type)
Create a new instance of CanvasRenderService.


| Param | Description |
| --- | --- |
| width | The width of the charts to render, in pixels. |
| height | The height of the charts to render, in pixels. |
| chartCallback | optional callback which is called once with a new ChartJS global reference. |
| type | optional The canvas type ('PDF' or 'SVG'), see the [canvas pdf doc](https://github.com/Automattic/node-canvas#pdf-output-support). |

<a name="CanvasRenderService+renderToDataURL"></a>

### canvasRenderService.renderToDataURL(configuration, mimeType)
Render to a data url as png.

**Kind**: instance method of [<code>CanvasRenderService</code>](#CanvasRenderService)  
**See**: https://github.com/Automattic/node-canvas#canvastodataurl  

| Param | Default | Description |
| --- | --- | --- |
| configuration |  | The Chart JS configuration for the chart to render. |
| mimeType | <code>image/png</code> | The image format, `image/png` or `image/jpeg`. |

<a name="CanvasRenderService+renderToBuffer"></a>

### canvasRenderService.renderToBuffer(configuration, mimeType)
Render to a buffer as png.

**Kind**: instance method of [<code>CanvasRenderService</code>](#CanvasRenderService)  
**See**: https://github.com/Automattic/node-canvas#canvastobuffer  

| Param | Default | Description |
| --- | --- | --- |
| configuration |  | The Chart JS configuration for the chart to render. |
| mimeType | <code>image/png</code> | A string indicating the image format. Valid options are `image/png`, `image/jpeg` (if node-canvas was built with JPEG support), `raw` (unencoded ARGB32 data in native-endian byte order, top-to-bottom), `application/pdf` (for PDF canvases) and image/svg+xml (for SVG canvases). Defaults to `image/png` for image canvases, or the corresponding type for PDF or SVG canvas. |

<a name="CanvasRenderService+renderToStream"></a>

### canvasRenderService.renderToStream(configuration, mimeType)
Render to a stream as png.

**Kind**: instance method of [<code>CanvasRenderService</code>](#CanvasRenderService)  
**See**: https://github.com/Automattic/node-canvas#canvascreatepngstream  

| Param | Default | Description |
| --- | --- | --- |
| configuration |  | The Chart JS configuration for the chart to render. |
| mimeType | <code>image/png</code> | A string indicating the image format. Valid options are `image/png`, `image/jpeg` (if node-canvas was built with JPEG support), `application/pdf` (for PDF canvases) and image/svg+xml (for SVG canvases). Defaults to `image/png` for image canvases, or the corresponding type for PDF or SVG canvas. |