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- import type { Chart, Point, FontSpec, CanvasFontSpec, PointStyle, RenderTextOpts } from '../types/index.js';
- import type { TRBL, SplinePoint, RoundedRect, TRBLCorners } from '../types/geometric.js';
- /**
- * Converts the given font object into a CSS font string.
- * @param font - A font object.
- * @return The CSS font string. See https://developer.mozilla.org/en-US/docs/Web/CSS/font
- * @private
- */
- export declare function toFontString(font: FontSpec): string;
- /**
- * @private
- */
- export declare function _measureText(ctx: CanvasRenderingContext2D, data: Record<string, number>, gc: string[], longest: number, string: string): number;
- type Thing = string | undefined | null;
- type Things = (Thing | Thing[])[];
- /**
- * @private
- */
- export declare function _longestText(ctx: CanvasRenderingContext2D, font: string, arrayOfThings: Things, cache?: {
- data?: Record<string, number>;
- garbageCollect?: string[];
- font?: string;
- }): number;
- /**
- * Returns the aligned pixel value to avoid anti-aliasing blur
- * @param chart - The chart instance.
- * @param pixel - A pixel value.
- * @param width - The width of the element.
- * @returns The aligned pixel value.
- * @private
- */
- export declare function _alignPixel(chart: Chart, pixel: number, width: number): number;
- /**
- * Clears the entire canvas.
- */
- export declare function clearCanvas(canvas?: HTMLCanvasElement, ctx?: CanvasRenderingContext2D): void;
- export interface DrawPointOptions {
- pointStyle: PointStyle;
- rotation?: number;
- radius: number;
- borderWidth: number;
- }
- export declare function drawPoint(ctx: CanvasRenderingContext2D, options: DrawPointOptions, x: number, y: number): void;
- export declare function drawPointLegend(ctx: CanvasRenderingContext2D, options: DrawPointOptions, x: number, y: number, w: number): void;
- /**
- * Returns true if the point is inside the rectangle
- * @param point - The point to test
- * @param area - The rectangle
- * @param margin - allowed margin
- * @private
- */
- export declare function _isPointInArea(point: Point, area: TRBL, margin?: number): boolean;
- export declare function clipArea(ctx: CanvasRenderingContext2D, area: TRBL): void;
- export declare function unclipArea(ctx: CanvasRenderingContext2D): void;
- /**
- * @private
- */
- export declare function _steppedLineTo(ctx: CanvasRenderingContext2D, previous: Point, target: Point, flip?: boolean, mode?: string): void;
- /**
- * @private
- */
- export declare function _bezierCurveTo(ctx: CanvasRenderingContext2D, previous: SplinePoint, target: SplinePoint, flip?: boolean): void;
- /**
- * Render text onto the canvas
- */
- export declare function renderText(ctx: CanvasRenderingContext2D, text: string | string[], x: number, y: number, font: CanvasFontSpec, opts?: RenderTextOpts): void;
- /**
- * Add a path of a rectangle with rounded corners to the current sub-path
- * @param ctx - Context
- * @param rect - Bounding rect
- */
- export declare function addRoundedRectPath(ctx: CanvasRenderingContext2D, rect: RoundedRect & {
- radius: TRBLCorners;
- }): void;
- export {};
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