Method _showIndicator

src/component/visualMap/ContinuousView.ts:648–733

(
        cursorValue: number,
        textValue: number,
        rangeSymbol?: string,
        halfHoverLinkSize?: number
    )

    }

    private _showIndicator(
        cursorValue: number,
        textValue: number,
        rangeSymbol?: string,
        halfHoverLinkSize?: number
    ) {
        const visualMapModel = this.visualMapModel;
        const dataExtent = visualMapModel.getExtent();
        const itemSize = visualMapModel.itemSize;
        const sizeExtent = [0, itemSize[1]];

        const shapes = this._shapes;
        const indicator = shapes.indicator;
        if (!indicator) {
            return;
        }

        indicator.attr('invisible', false);

        const opts = {convertOpacityToAlpha: true};
        const color = this.getControllerVisual(cursorValue, 'color', opts) as ColorString;
        const symbolSize = this.getControllerVisual(cursorValue, 'symbolSize') as number;
        const y = linearMap(cursorValue, dataExtent, sizeExtent, true);
        const x = itemSize[0] - symbolSize / 2;

        const oldIndicatorPos = { x: indicator.x, y: indicator.y };
        // Update handle label position.
        indicator.y = y;
        indicator.x = x;
        const textPoint = graphic.applyTransform(
            shapes.indicatorLabelPoint,
            graphic.getTransform(indicator, this.group)
        );

        const indicatorLabel = shapes.indicatorLabel;
        indicatorLabel.attr('invisible', false);
        const align = this._applyTransform('left', shapes.mainGroup);
        const orient = this._orient;
        const isHorizontal = orient === 'horizontal';
        indicatorLabel.setStyle({
            text: (rangeSymbol ? rangeSymbol : '') + visualMapModel.formatValueText(textValue),
            verticalAlign: isHorizontal ? align as TextVerticalAlign : 'middle',
            align: isHorizontal ? 'center' : align as TextAlign
        });

        const indicatorNewProps = {
            x: x,
            y: y,
            style: {
                fill: color
            }
        };
        const labelNewProps = {
            style: {
                x: textPoint[0],
                y: textPoint[1]
            }
        };