Function getAvgPixelByChannel

test/jasmine/tests/parcoords_test.js:61–76

(id)

}

function getAvgPixelByChannel(id) {
    var canvas = d3Select(id).node();

    var imgData = readPixel(canvas, 0, 0, canvas.width, canvas.height);
    var n = imgData.length * 0.25;
    var r = 0;
    var g = 0;
    var b = 0;

    for(var i = 0; i < imgData.length; i++) {
        r += imgData[i++];
        g += imgData[i++];
        b += imgData[i++];
    }
    return [r / n, g / n, b / n];
}

describe('parcoords initialization tests', function() {
    'use strict';