Method _createBarVisual

src/component/visualMap/ContinuousView.ts:503–529

(
        dataInterval: number[],
        dataExtent: number[],
        handleEnds: number[],
        forceState: ContinuousModel['stateList'][number]
    )

    }

    private _createBarVisual(
        dataInterval: number[],
        dataExtent: number[],
        handleEnds: number[],
        forceState: ContinuousModel['stateList'][number]
    ): BarVisual {
        const opts = {
            forceState: forceState,
            convertOpacityToAlpha: true
        };
        const colorStops = this._makeColorGradient(dataInterval, opts);

        const symbolSizes = [
            this.getControllerVisual(dataInterval[0], 'symbolSize', opts) as number,
            this.getControllerVisual(dataInterval[1], 'symbolSize', opts) as number
        ];
        const barPoints = this._createBarPoints(handleEnds, symbolSizes);

        return {
            barColor: new LinearGradient(0, 0, 0, 1, colorStops),
            barPoints: barPoints,
            handlesColor: [
                colorStops[0].color,
                colorStops[colorStops.length - 1].color
            ]
        };
    }

    private _makeColorGradient(
        dataInterval: number[],