Dynamically generated left padding for axis ticks are not always accurate

Reference in code, using Y-Axis as example:

The spacing calculated for the left padding:

_getAdjustedLeftPadding: function(options) {
    var yDomainScaled = this._getYScaledDomain(this.yDomain, this.options);
    var tmpScale = d3.scale.linear().domain(yDomainScaled);
    var yLabels = tmpScale.ticks(options.ticks);
    var format = options.labels.formatter || d3.format(options.labels.format || ",.0f");
    var yAxisText = _.map(yLabels, format).join("<br>");
    var yLabelBounds = _.nw.textBounds(yAxisText, ".y.axis");
    return maxTickSize(this.options.yAxis) + (this.options.yAxis.tickPadding || 0) + yLabelBounds.width;
},

^ Uses tmpScale.ticks(options.ticks) to generate approximated tick values for spacing calculation

The actual tick value calculation for the y-axis:

axis: function() {
    /*jshint eqnull:true */
    var options = this.options.yAxis;
    var domain = this.domain;
    var dMin = options.min != null ? options.min : options.zeroAnchor ? Math.min(0, domain[0]) : domain[0];
    var dMax = options.max != null ? options.max : domain[1];
    var tickValues = options.tickValues || _.nw.niceTicks(dMin, dMax, options.ticks);
    var numTicks = this.numTicks(domain, options.min, options.max);
    var format = options.labels.formatter || d3.format(options.labels.format);
    return d3.svg.axis().scale(this._scale).tickFormat(format).tickSize(options.innerTickSize, options.outerTickSize).tickPadding(options.tickPadding).ticks(numTicks).tickValues(tickValues);
},

^ Uses options.tickValues || _.nw.niceTicks(dMin, dMax, options.ticks); to generate the actual tick values to be rendered.

This will occasionally cause the the ticks labels to be rendered with an inaccurate amount of space for them. We managed to produce this issue with a standard column chart using the data: [{"x":"AGM","y":12.125990845966125},{"x":"Supercapacitor","y":-12.39133198369404}]

forio / contour

Dynamically generated left padding for axis ticks are not always accurate #297