import type { Chart, ChartSeries, DataLabels } from "./types.js";
import type { ChartFont } from "./schema/ChartFont.js";
import type { Rect } from "./chart.js";
import type { ChartStyleBorder } from "./schema/ChartStyleBorder.js";
import type { ChartStyleFont } from "./schema/ChartStyleFont.js";
export declare let AXIS_FONT_SIZE: number;
export declare let LEGEND_FONT_SIZE: number;
export declare let TITLE_FONT_SIZE: number;
export declare let AXIS_TITLE_FONT_SIZE: number;
export declare let DATA_LABEL_FONT_SIZE: number;
export declare let CHART_FONT_SCALE: number;
export declare function chartFontScale(rect: Rect): number;
export declare function applyChartFontScale(rect: Rect): number;
export type ResolvedTitleFont = {
    css: string;
    size: number;
    color?: string;
};
export declare function resolveTitleFont(font: ChartFont | undefined, baseSizePx: number): ResolvedTitleFont;
export declare function resolveAxisLabelFont(font: ChartFont | undefined): ResolvedTitleFont;
export declare function drawStyleBox(ctx: CanvasRenderingContext2D, rect: Rect, fill?: string, border?: ChartStyleBorder): void;
export declare function chartFontCss(font: ChartStyleFont | undefined, fallbackSize: number): string;
export declare function axisStraddlesZero(minV: number, maxV: number): boolean;
export interface ZeroAxisMetrics {
    straddlesZero: boolean;
    zeroFrac: number;
    zeroY: number;
    zeroX: number;
}
export declare function zeroAxisMetrics(inner: Rect, minV: number, maxV: number): ZeroAxisMetrics;
export declare function paintZeroBaseline(ctx: CanvasRenderingContext2D, inner: Rect, minV: number, maxV: number): void;
export declare function isZeroTickInside(t: number, minV: number, maxV: number): boolean;
export interface BarSlotMetrics {
    barW: number;
    firstBarLeftOffset: number;
    barShift: number;
}
export declare function computeBarSlotMetrics(slotW: number, seriesCount: number, stacked: boolean, gapWidthPct: number | undefined, overlapPct: number | undefined): BarSlotMetrics;
export declare function valueRange(rows: number[][]): {
    minV: number;
    maxV: number;
};
export declare function buildStackedRows(series: ChartSeries[], categoryCount: number, percent: boolean): number[][];
export declare function categoryAxisExtraRows(chart: Chart): string[][];
export declare function categoryAxisExtraHeight(chart: Chart): number;
export declare function catAxisRotation(chart: Chart): number;
export declare function valAxisRotation(chart: Chart): number;
export declare function categoryAxisLabels(chart: Chart, categoryCount: number): string[];
export declare function resolveCatAxisRotation(ctx: CanvasRenderingContext2D, chart: Chart, labels: string[], innerWidth: number): number;
export declare function rotatedLabelBandHeight(ctx: CanvasRenderingContext2D, labels: string[], rotationDeg: number): number;
export declare function rotatedLabelBandWidth(ctx: CanvasRenderingContext2D, labels: string[], rotationDeg: number): number;
export declare function drawRotatedLabel(ctx: CanvasRenderingContext2D, text: string, anchorX: number, anchorY: number, rotationDeg: number, kind: "category" | "value"): void;
export declare function drawAxisFrame(ctx: CanvasRenderingContext2D, chart: Chart, rect: Rect, ticks: number[], minV: number, maxV: number, horizontal: boolean, percent: boolean): Rect;
export declare function drawCategoryAxis(ctx: CanvasRenderingContext2D, chart: Chart, inner: Rect, categoryCount: number, horizontal: boolean): void;
export declare function drawCategoryAxisExtraRowsCentered(ctx: CanvasRenderingContext2D, chart: Chart, inner: Rect, categoryCount: number, xCenterFor: (i: number) => number): void;
export declare function seriesLineWidth(s: ChartSeries, fallback: number): number;
export declare function seriesLineDash(s: ChartSeries): number[];
export declare function withAlpha(color: string, alpha: number): string;
export type LegendSwatchKind = "swatch" | "line" | "marker" | "lineMarker" | "verticalBar";
export declare function drawLegend(ctx: CanvasRenderingContext2D, series: ChartSeries[], rect: Rect, orientation?: "horizontal" | "vertical", chart?: Chart): void;
export declare function measureVerticalLegendWidth(ctx: CanvasRenderingContext2D, series: ChartSeries[]): number;
export declare function drawPlaceholderPlot(ctx: CanvasRenderingContext2D, chart: Chart, rect: Rect): void;
export declare function effectiveLabels(chart: Chart, s: ChartSeries): DataLabels | undefined;
export declare function pointLabel(base: DataLabels, i: number): {
    dl: DataLabels;
    text?: string;
} | null | undefined;
export declare function buildLabelText(dl: DataLabels, chart: Chart, series: ChartSeries, categoryIdx: number, value: number, categoryTotal: number): string;
export declare function drawLabel(ctx: CanvasRenderingContext2D, text: string, x: number, y: number, align?: CanvasTextAlign, baseline?: CanvasTextBaseline): void;
export declare function resolveAxisRange(dataMin: number, dataMax: number, forcedMin: number | undefined, forcedMax: number | undefined, tickCount: number, forcedMajorUnit?: number): {
    minV: number;
    maxV: number;
    ticks: number[];
};
export declare function niceTicks(min: number, max: number, count: number): number[];
export declare function niceNum(range: number, round: boolean): number;
export declare function formatAxisValue(v: number, fmt: string | undefined, divisor?: number | null): string;
export declare function formatGeneral(v: number): string;
export declare function decimalsIn(fmt: string): number;
export declare function withGrouping(v: number, decimals: number): string;