in src/radarChart.ts [640:666]
private drawAxes(values: PrimitiveValue[]): void {
let axisBeginning: number = this.radarChartData.settings.displaySettings.axisBeginning;
const angle: number = this.angle,
radius: number = this.radius;
let selection: d3.Selection<d3.BaseType, RadarChartCircularSegment, any, any> = this.mainGroupElement
.select(RadarChart.AxisSelector.selectorName)
.selectAll(RadarChart.AxisNodeSelector.selectorName);
let axexSelection: d3.Selection<d3.BaseType, PrimitiveValue, any, any> = selection.data(values);
axexSelection
.exit()
.remove();
axexSelection = axexSelection
.enter()
.append("svg:line")
.classed(RadarChart.AxisNodeSelector.className, true)
.merge(axexSelection)
.attr("x1", 0)
.attr("y1", 0)
.attr("x2", (d: PrimitiveValue, i: number) => radius * Math.sin(i * angle))
.attr("y2", (d: PrimitiveValue, i: number) => axisBeginning * radius * Math.cos(i * angle));
this.changeAxesLineColorInHighMode([axexSelection]);
}