get-canvas-pixel-color
Micro module to get the color of a single pixel on a HTML canvas
This is a convenience method around the canvas getImageData
API for just one pixel. If you need to get the color of a lot of pixels at once, it's best to use the underlying API: it's more efficient because you can specify the coordinates of the patch.
Usage
var canvas = document.querySelector('canvas');
var color = getCanvasPixelColor(canvas, 200, 10);
var red = color.r;
var red = color[0];
var alpha = color.a;
var cssString = color.rgb;
With browserify
npm install --save get-canvas-pixel-color
var getCanvasPixelColor = require('get-canvas-pixel-color');
Alternative usage in ES6
import getCanvasPixelColor from 'get-canvas-pixel-color';
let canvas = document.querySelector('canvas');
let {r, g, b} = getCanvasPixelColor(canvas, 200, 10);
API
getCanvasPixelColor(canvas, x, y)
parameter | description |
---|
canvas | Type: canvas element or canvas context , required The canvas from which to take the color |
x | Type: number , required The x coordinate of the pixel to read |
y | Type: number , required The y coordinate of the pixel to read |
@returns | Type: array/object see usage example |
Files
Here's an explanation of the files included in this repo
index.js
: source file, in ES6dist/get-canvas-pixel-color.js
: browser-ready file with AMD or a global variable called getCanvasPixelColor
dist/get-canvas-pixel-color.min.js
: same as above, minified
Dependencies
No dependencies.
License
MIT © Federico Brigante