/** Heat drawing: alpha-summed discs recoloured through a thermal palette, or scroll-reach bands. */
export interface HeatPoint {
    x: number;
    y: number;
    weight: number;
}
/** Points are in canvas pixels; `radius` too. */
export declare function drawHeatPoints({ context, points, radius, }: {
    context: CanvasRenderingContext2D;
    points: HeatPoint[];
    radius: number;
}): void;
/** `reach[p]` is the share of page views that saw p% of the page, from each view's deepest point. */
export declare function getScrollReach(buckets: {
    pct: number;
    views: number;
}[]): number[];
export declare function drawScrollBands({ context, reach, }: {
    context: CanvasRenderingContext2D;
    reach: number[];
}): void;
/** Page y (canvas px) where reach first drops below each mark. */
export declare function getReachMarks({ reach, height, }: {
    reach: number[];
    height: number;
}): {
    share: number;
    y: number;
}[];
export declare function drawMarkLine({ context, y, label, dashed, scale, }: {
    context: CanvasRenderingContext2D;
    y: number;
    label: string;
    dashed: boolean;
    scale: number;
}): void;