StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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68 lines
1.8 KiB
68 lines
1.8 KiB
4 years ago
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# get-canvas-context
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[](http://github.com/badges/stability-badges)
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Creates a new HTML5 Canvas Context with the given dimensions and options. Returns `null` if not supported.
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Supports `'webgl'`, `'webgl2'` and `'2d'`, handles vendor prefixing, and runs in Node and the Browser.
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## Install
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```sh
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npm install get-canvas-context --save
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```
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## Example
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```js
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var getContext = require('get-canvas-context')
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// create a new 50x50 2D canvas
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var ctx = getContext('2d', {
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width: 50,
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height: 50
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})
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// add to DOM
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document.body.appendChild(ctx.canvas)
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// draw to it
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ctx.fillRect(0, 0, 50, 50)
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```
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Or, WebGL using an existing canvas:
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```js
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var canvas = document.createElement('canvas')
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var gl = getContext('webgl', {
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canvas: canvas,
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antialias: true
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})
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if (!gl) {
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throw new Error('webgl not supported')
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}
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```
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## Usage
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[](https://www.npmjs.com/package/get-canvas-context)
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#### `ctx = createContext(type, [opt])`
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Returns a new canvas context for the given `type`, a string which is either `'2d'`, `'webgl'` or `'webgl2'`. The options:
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- `canvas` - an existing canvas element to re-use rather than creating a new one
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- `width` - if specified, will set the canvas width
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- `height` - if specified, will set the canvas height
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- `{...contextAttributes}` any other options for the rendering context, like `alpha`
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Handles vendor prefixing for WebGL contexts. Returns `null` if we are not in a browser, or if the context is not available, or if there was an error creating the context.
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**Note:** As of the time of writing (Jun 2015), `"webgl2"` is only supported through special flags in Chrome Canary and FireFox Nightly.
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## License
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MIT, see [LICENSE.md](http://github.com/Jam3/get-canvas-context/blob/master/LICENSE.md) for details.
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