Function calc

src/traces/scatter/calc.js:15–157

(gd, trace)

var calcSelection = require('./calc_selection');

function calc(gd, trace) {
    var fullLayout = gd._fullLayout;
    var xa = trace._xA = Axes.getFromId(gd, trace.xaxis || 'x', 'x');
    var ya = trace._yA = Axes.getFromId(gd, trace.yaxis || 'y', 'y');
    var origX = xa.makeCalcdata(trace, 'x');
    var origY = ya.makeCalcdata(trace, 'y');
    var xObj = alignPeriod(trace, xa, 'x', origX);
    var yObj = alignPeriod(trace, ya, 'y', origY);
    var x = xObj.vals;
    var y = yObj.vals;

    var serieslen = trace._length;
    var cd = new Array(serieslen);
    var ids = trace.ids;
    var stackGroupOpts = getStackOpts(trace, fullLayout, xa, ya);
    var interpolateGaps = false;
    var isV, i, j, k, interpolate, vali;

    setFirstScatter(fullLayout, trace);

    var xAttr = 'x';
    var yAttr = 'y';
    var posAttr;
    if(stackGroupOpts) {
        Lib.pushUnique(stackGroupOpts.traceIndices, trace.index);
        isV = stackGroupOpts.orientation === 'v';

        // size, like we use for bar
        if(isV) {
            yAttr = 's';
            posAttr = 'x';
        } else {
            xAttr = 's';
            posAttr = 'y';
        }
        interpolate = stackGroupOpts.stackgaps === 'interpolate';
    } else {
        var ppad = calcMarkerSize(trace, serieslen);
        calcAxisExpansion(gd, trace, xa, ya, x, y, ppad);
    }

    var hasPeriodX = !!trace.xperiodalignment;
    var hasPeriodY = !!trace.yperiodalignment;

    for(i = 0; i < serieslen; i++) {
        var cdi = cd[i] = {};
        var xValid = isNumeric(x[i]);
        var yValid = isNumeric(y[i]);
        if(xValid && yValid) {
            cdi[xAttr] = x[i];
            cdi[yAttr] = y[i];

            if(hasPeriodX) {
                cdi.orig_x = origX[i]; // used by hover
                cdi.xEnd = xObj.ends[i];
                cdi.xStart = xObj.starts[i];
            }
            if(hasPeriodY) {