Method _drawLabels

src/charts/line-chart.js:431–457

(layers)

    }

    _drawLabels (layers) {
        const chart = this;
        layers.each(function (data, layerIndex) {
            const layer = select(this);
            const labels = layer.selectAll('text.lineLabel')
                .data(data.values, pluck('x'));

            const labelsEnterModify = labels
                .enter()
                .append('text')
                .attr('class', 'lineLabel')
                .attr('text-anchor', 'middle')
                .merge(labels);

            transition(labelsEnterModify, chart.transitionDuration())
                .attr('x', d => utils.safeNumber(chart.x()(d.x)))
                .attr('y', d => {
                    const y = chart.y()(d.y + d.y0) - LABEL_PADDING;
                    return utils.safeNumber(y);
                })
                .text(d => chart.label()(d));

            transition(labels.exit(), chart.transitionDuration())
                .attr('height', 0)
                .remove();
        });
    }

    _createRefLines (g) {
        const yRefLine = g.select(`path.${Y_AXIS_REF_LINE_CLASS}`).empty() ?