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