Function getPosArrays

src/traces/box/calc.js:310–347

(trace, posLetter, posAxis, num)

// per trace, set x0 (y0) to the x (y) value or category for this trace
// (or set x (y) to a constant array matching y (x))
function getPosArrays(trace, posLetter, posAxis, num) {
    var hasPosArray = posLetter in trace;
    var hasPos0 = posLetter + '0' in trace;
    var hasPosStep = 'd' + posLetter in trace;

    if(hasPosArray || (hasPos0 && hasPosStep)) {
        var origPos = posAxis.makeCalcdata(trace, posLetter);
        var pos = alignPeriod(trace, posAxis, posLetter, origPos).vals;
        return [pos, origPos];
    }

    var pos0;
    if(hasPos0) {
        pos0 = trace[posLetter + '0'];
    } else if('name' in trace && (
        posAxis.type === 'category' || (
            isNumeric(trace.name) &&
            ['linear', 'log'].indexOf(posAxis.type) !== -1
        ) || (
            Lib.isDateTime(trace.name) &&
            posAxis.type === 'date'
        )
    )) {
        pos0 = trace.name;
    } else {
        pos0 = num;
    }

    var pos0c = posAxis.type === 'multicategory' ?
        posAxis.r2c_just_indices(pos0) :
        posAxis.d2c(pos0, 0, trace[posLetter + 'calendar']);

    var len = trace._length;
    var out = new Array(len);
    for(var i = 0; i < len; i++) out[i] = pos0c;

    return [out];
}

function makeBins(x, dx) {
    var len = x.length;