Class VirtualContext

A Canvas' 2D rendering context that is not rendered.
Useful to work with ImageData objects, TextMetrics, to create bitmap data and anything else you can do with a 2D context.

Hierarchy

VirtualContext

Index

Methods

Methods

Static _init

_init(): void

- Defined in VirtualContext.ts:14
Used internally to initialise the virual context.

Returns void

Static getImageData

getImageData(image: HTMLImageElement, width?: undefined | number, height?: undefined | number): ImageData

- Defined in VirtualContext.ts:43
Get the image data from an image object.

Parameters
- image: HTMLImageElement
  
  The image to get the data from.
- Optional width: undefined | number
  
  The width of the image (defaults to the actual image's width).
- Optional height: undefined | number
  
  The height of the image (defaults to the actual image's height).
Returns ImageData

Static measureText

measureText(text: string, font: string): number

- Defined in VirtualContext.ts:59
Get the width of a text with a specified font.

Parameters
- text: string
  
  The text to measure.
- font: string
  
  The font to use.
Returns number

Static requestBuffer

requestBuffer(width: number, height: number): CanvasRenderingContext2D

- Defined in VirtualContext.ts:26
Request the virtual context.

Parameters
- width: number
  
  The width to request from the context.
- height: number
  
  The height to request from the context.
Returns CanvasRenderingContext2D

The context object.

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