Method _initSymbolLabelAnimation

src/chart/line/LineView.ts:1078–1177

(
        data: SeriesData,
        coordSys: Polar | Cartesian2D,
        clipShape: PolarArea | Cartesian2DArea
    )

    }

    _initSymbolLabelAnimation(
        data: SeriesData,
        coordSys: Polar | Cartesian2D,
        clipShape: PolarArea | Cartesian2DArea
    ) {
        let isHorizontalOrRadial: boolean;
        let isCoordSysPolar: boolean;
        const baseAxis = coordSys.getBaseAxis();
        const isAxisInverse = baseAxis.inverse;
        if (coordSys.type === 'cartesian2d') {
            isHorizontalOrRadial = (baseAxis as Axis2D).isHorizontal();
            isCoordSysPolar = false;
        }
        else if (coordSys.type === 'polar') {
            isHorizontalOrRadial = baseAxis.dim === 'angle';
            isCoordSysPolar = true;
        }

        const seriesModel = data.hostModel;
        let seriesDuration = seriesModel.get('animationDuration');
        if (zrUtil.isFunction(seriesDuration)) {
            seriesDuration = seriesDuration(null);
        }
        const seriesDelay = seriesModel.get('animationDelay') || 0;
        const seriesDelayValue = zrUtil.isFunction(seriesDelay)
            ? seriesDelay(null)
            : seriesDelay;

        data.eachItemGraphicEl(function (symbol: SymbolExtended, idx) {
            const el = symbol;
            if (el) {
                const point = [symbol.x, symbol.y];
                let start;
                let end;
                let current;
                if (clipShape) {
                    if (isCoordSysPolar) {
                        const polarClip = clipShape as PolarArea;
                        const coord = (coordSys as Polar).pointToCoord(point);
                        if (isHorizontalOrRadial) {
                            start = polarClip.startAngle;
                            end = polarClip.endAngle;
                            current = -coord[1] / 180 * Math.PI;
                        }
                        else {
                            start = polarClip.r0;
                            end = polarClip.r;
                            current = coord[0];
                        }
                    }
                    else {
                        const gridClip = clipShape as Cartesian2DArea;
                        if (isHorizontalOrRadial) {
                            start = gridClip.x;
                            end = gridClip.x + gridClip.width;
                            current = symbol.x;
                        }
                        else {