Method defaultText

src/chart/line/LineView.ts:1216–1220

(dataIndex, opt, interpolatedValue)

                        labelFetcher: seriesModel,
                        labelDataIndex: dataIndex,
                        defaultText(dataIndex, opt, interpolatedValue) {
                            return interpolatedValue != null
                                ? getDefaultInterpolatedLabel(data, interpolatedValue)
                                : getDefaultLabel(data, dataIndex);
                        },
                        enableTextSetter: true
                    },
                    getEndLabelStateSpecified(endLabelModel, coordSys)