gordonlesti / broilerjs Goto Github PK
View Code? Open in Web Editor NEWA simple, lightweight jQuery plugin to get the color of an image pixel by click.
License: MIT License
A simple, lightweight jQuery plugin to get the color of an image pixel by click.
License: MIT License
This amend allows CORS allow origin to work, providing the correct Access-Control-Allow-Origin header is set, by creating a new image with the crossOrigin attribute set.
It reloads the image, but it's the only way I could get around it.
Note, as per the drdrek's solution, the tag also needs crossorigin="anonymous" to avoid browser caching issue
https://stackoverflow.com/questions/31732533/s3-cors-always-send-vary-origin
( function( factory ) {
"use strict";
if ( typeof define === "function" && define.amd ) {
// AMD
define( [ "jquery" ], factory );
} else if ( typeof exports === "object" ) {
// CommonJs
factory( require( "jquery" ) );
} else {
// Browser globals
factory( jQuery );
}
}( function( $ ) {
"use strict";
$.fn.broiler = function( callBack ) {
var image = this[ 0 ],
canvas = $( "<canvas/>" )[ 0 ],
imageData;
var imgCanvas = new Image;
imgCanvas.crossOrigin = "Anonymous";
imgCanvas.onload = function() {
canvas.width = imgCanvas.width;
canvas.height = imgCanvas.height;
canvas.getContext( "2d" ) .drawImage( imgCanvas, 0, 0, image.width, image.height );
imageData = canvas.getContext( "2d" ).getImageData( 0, 0, imgCanvas.width, imgCanvas.height ).data;
$(image).click( function( event ) {
var offset = $( this ).offset(), x, y, scrollLeft, scrollTop, start;
scrollLeft = $( window ).scrollLeft();
scrollTop = $( window ).scrollTop();
x = Math.round( event.clientX - offset.left + scrollLeft );
y = Math.round( event.clientY - offset.top + scrollTop );
start = ( x + y * imgCanvas.width ) * 4;
callBack( {
r: imageData[ start ],
g: imageData[ start + 1 ],
b: imageData[ start + 2 ],
a: imageData[ start + 3 ]
} );
} );
}
imgCanvas.src = image.src;
// make sure the load event fires for cached images too
if ( imgCanvas.complete || imgCanvas.complete === undefined ) {
imgCanvas.src = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";
imgCanvas.src = src;
}
};
} ) );
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