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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { ChartJs, Rect2D, SvgCanvas, SvgCanvas2DGradient } from "./deps.ts";
/** The set of chart options that are supported. Unsupported or fixed values * are omitted from the underlying {@linkcode ChartJs.ChartOptions}. */export type ChartOptions = Omit<  ChartJs.ChartOptions,  | "responsive"  | "responsiveAnimationDuration"  | "events"  | "legendCallback"  | "onHover"  | "onClick"  | "onResize"  | "hover"  | "animation">;
/** The configuration options that are settable when rendering a chart. */export interface ChartConfiguration {  /** The width, in pixels, of the chart.   *   * Defaults to `768`.   */  width?: number;  /** The height, in pixels, of the chart.   *   * Defaults to `384`.   */  height?: number;  /** The type of chart.   *   * Defaults to `"line"`.   */  type?: ChartJs.ChartType;  /** Data to be rendered in the chart. */  data?: ChartJs.ChartData;  /** Options which can be configured on the chart. */  options?: ChartOptions;  /** Chart plugins to be registered for the chart. */  plugins?: ChartJs.PluginServiceRegistrationOptions[];}
interface SvgCanvasCanvas {  canvas?: {    width: number;    height: number;    style: Record<string, string>;  };}
/** Render a chart, returning a SVG string representation of the chart. * * This is a lower level function, where the `Chart` component and `renderChart` * are intended for use within a Fresh application. */export function chart(  { width = 768, height = 384, type, data, options = {} }: ChartConfiguration =    {},): string {  Object.assign(options, {    animation: undefined,    events: [],    responsive: false,  });
  const ctx: SvgCanvas & SvgCanvasCanvas = new SvgCanvas();  ctx.canvas = {    width,    height,    style: { width: `${width}px`, height: `${height}px` },  };  ctx.fontHeightRatio = 2;  // deno-lint-ignore no-explicit-any  const el: HTMLCanvasElement = { getContext: () => ctx } as any;  const savedGradient = globalThis.CanvasGradient;  globalThis.CanvasGradient = SvgCanvas2DGradient as typeof CanvasGradient;
  try {    new ChartJs.Chart(el, { type, data, options });  } finally {    if (savedGradient) {      globalThis.CanvasGradient = savedGradient;    }  }
  return ctx.render(new Rect2D(0, 0, width, height), "px");}