Function resolveAnnotationRgba

src/core/createRenderCoordinator.ts:3392–3399

(color: string | undefined, opacity: number | undefined)

    const plotHeightCss = Math.max(0, plotBottomCss - plotTopCss);

    const resolveAnnotationRgba = (color: string | undefined, opacity: number | undefined): readonly [number, number, number, number] => {
      const base =
        parseCssColorToRgba01(color ?? currentOptions.theme.textColor) ??
        parseCssColorToRgba01(currentOptions.theme.textColor) ??
        ([1, 1, 1, 1] as const);
      const o = opacity == null ? 1 : clamp01(opacity);
      return [clamp01(base[0]), clamp01(base[1]), clamp01(base[2]), clamp01(base[3] * o)] as const;
    };

    const annotations: ReadonlyArray<AnnotationConfig> = hasCartesianSeries ? (currentOptions.annotations ?? []) : [];