Function getAutoRange

src/plots/cartesian/autorange.js:52–192

* getAutoRange * * Collects all _extremes values corresponding to a given axis * and computes its auto range. * * Note that getAutoRange uses return values from findExtremes. * * @param {object} gd: * graph div object with filled-in fullData and fullLayout, in particular * with filled-i

(gd, ax)

 * would be impossible.
 */
function getAutoRange(gd, ax) {
    var i, j;
    var newRange = [];

    var fullLayout = gd._fullLayout;
    var getPadMin = makePadFn(fullLayout, ax, 0);
    var getPadMax = makePadFn(fullLayout, ax, 1);
    var extremes = concatExtremes(gd, ax);
    var minArray = extremes.min;
    var maxArray = extremes.max;

    if(minArray.length === 0 || maxArray.length === 0) {
        return Lib.simpleMap(ax.range, ax.r2l);
    }

    var minmin = minArray[0].val;
    var maxmax = maxArray[0].val;

    for(i = 1; i < minArray.length; i++) {
        if(minmin !== maxmax) break;
        minmin = Math.min(minmin, minArray[i].val);
    }
    for(i = 1; i < maxArray.length; i++) {
        if(minmin !== maxmax) break;
        maxmax = Math.max(maxmax, maxArray[i].val);
    }

    var autorange = ax.autorange;
    var axReverse =
        autorange === 'reversed' ||
        autorange === 'min reversed' ||
        autorange === 'max reversed';

    if(!axReverse && ax.range) {
        var rng = Lib.simpleMap(ax.range, ax.r2l);
        axReverse = rng[1] < rng[0];
    }

    // one-time setting to easily reverse the axis
    // when plotting from code
    if(ax.autorange === 'reversed') {
        ax.autorange = true;
    }

    var rangeMode = ax.rangemode;
    var toZero = rangeMode === 'tozero';
    var nonNegative = rangeMode === 'nonnegative';
    var axLen = ax._length;
    // don't allow padding to reduce the data to < 10% of the length
    var minSpan = axLen / 10;

    var mbest = 0;
    var minpt, maxpt, minbest, maxbest, dp, dv;

    for(i = 0; i < minArray.length; i++) {
        minpt = minArray[i];
        for(j = 0; j < maxArray.length; j++) {
            maxpt = maxArray[j];