Function getColorVisual

src/component/visualMap/visualEncoding.ts:86–115

(
    seriesModel: SeriesModel,
    visualMapModel: VisualMapModel,
    value: ParsedValue,
    valueState: VisualMapModel['stateList'][number]
)

// performance and export for heatmap?
// value can be Infinity or -Infinity
function getColorVisual(
    seriesModel: SeriesModel,
    visualMapModel: VisualMapModel,
    value: ParsedValue,
    valueState: VisualMapModel['stateList'][number]
) {
    const mappings = visualMapModel.targetVisuals[valueState];
    const visualTypes = VisualMapping.prepareVisualTypes(mappings);
    const resultVisual: Partial<Record<BuiltinVisualProperty, any>> = {
        color: getVisualFromData(seriesModel.getData(), 'color') // default color.
    };

    for (let i = 0, len = visualTypes.length; i < len; i++) {
        const type = visualTypes[i];
        const mapping = mappings[
            (type === 'opacity' ? '__alphaForOpacity' : type) as BuiltinVisualProperty
        ];
        mapping && mapping.applyVisual(value, getVisual, setVisual);
    }

    return resultVisual.color;

    function getVisual(key: BuiltinVisualProperty) {
        return resultVisual[key];
    }

    function setVisual(key: BuiltinVisualProperty, value: any) {
        resultVisual[key] = value;
    }
}