Function calc

src/traces/histogram/calc.js:18–231

(gd, trace)

var getBinSpanLabelRound = require('./bin_label_vals');

function calc(gd, trace) {
    var pos = [];
    var size = [];
    var isHorizontal = trace.orientation === 'h';
    var pa = Axes.getFromId(gd, isHorizontal ? trace.yaxis : trace.xaxis);
    var mainData = isHorizontal ? 'y' : 'x';
    var counterData = {x: 'y', y: 'x'}[mainData];
    var calendar = trace[mainData + 'calendar'];
    var cumulativeSpec = trace.cumulative;
    var i;

    var binsAndPos = calcAllAutoBins(gd, trace, pa, mainData);
    var binSpec = binsAndPos[0];
    var pos0 = binsAndPos[1];

    var nonuniformBins = typeof binSpec.size === 'string';
    var binEdges = [];
    var bins = nonuniformBins ? binEdges : binSpec;
    // make the empty bin array
    var inc = [];
    var counts = [];
    var inputPoints = [];
    var total = 0;
    var norm = trace.histnorm;
    var func = trace.histfunc;
    var densityNorm = norm.indexOf('density') !== -1;
    var i2, binEnd, n;

    if(cumulativeSpec.enabled && densityNorm) {
        // we treat "cumulative" like it means "integral" if you use a density norm,
        // which in the end means it's the same as without "density"
        norm = norm.replace(/ ?density$/, '');
        densityNorm = false;
    }

    var extremeFunc = func === 'max' || func === 'min';
    var sizeInit = extremeFunc ? null : 0;
    var binFunc = binFunctions.count;
    var normFunc = normFunctions[norm];
    var isAvg = false;
    var pr2c = function(v) { return pa.r2c(v, 0, calendar); };
    var rawCounterData;

    if(Lib.isArrayOrTypedArray(trace[counterData]) && func !== 'count') {
        rawCounterData = trace[counterData];
        isAvg = func === 'avg';
        binFunc = binFunctions[func];
    }

    // create the bins (and any extra arrays needed)
    // assume more than 1e6 bins is an error, so we don't crash the browser
    i = pr2c(binSpec.start);

    // decrease end a little in case of rounding errors
    binEnd = pr2c(binSpec.end) + (i - Axes.tickIncrement(i, binSpec.size, false, calendar)) / 1e6;

    while(i < binEnd && pos.length < 1e6) {
        i2 = Axes.tickIncrement(i, binSpec.size, false, calendar);