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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { ChartJs, Rect2D, SvgCanvas, SvgCanvas2DGradient } from "./deps.ts";
/** Underlying ChartJS defaults which can be modified. */export const defaults: ChartJs.Defaults = ChartJs.defaults;/** Underlying ChartJS plugins. */export const plugins = ChartJs.plugins;
/** The set of chart options that are supported. Unsupported or fixed values * are omitted from the underlying {@linkcode ChartJs.ChartOptions}. */export type ChartOptions<TType extends ChartJs.ChartType = ChartJs.ChartType> =  Omit<    ChartJs.ChartOptions<TType>,    | "responsive"    | "responsiveAnimationDuration"    | "events"    | "legendCallback"    | "onHover"    | "onClick"    | "onResize"    | "hover"    | "animation"  >;
/** The configuration options that are settable when rendering a chart. */export interface ChartConfiguration<  TType extends ChartJs.ChartType = ChartJs.ChartType,  TData = ChartJs.DefaultDataPoint<TType>,  TLabel = unknown,> {  /** 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<TType, TData, TLabel>;  /** Options which can be configured on the chart. */  options?: ChartOptions;  /** Chart plugins to be registered for the chart. */  plugins?: ChartJs.Plugin[];}
interface SvgCanvasExtras {  canvas?: {    width: number;    height: number;    style: Record<string, string>;  };  resetTransform?(): void;}
/** 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<  TType extends ChartJs.ChartType = ChartJs.ChartType,  TData = ChartJs.DefaultDataPoint<TType>,  TLabel = unknown,>(  { width = 768, height = 384, type = "bar", data, options = {}, plugins }:    ChartConfiguration<TType, TData, TLabel> = { data: { datasets: [] } },): string {  Object.assign(options, {    animation: false,    events: [],    responsive: false,  });
  const ctx: SvgCanvas & SvgCanvasExtras = new SvgCanvas();  ctx.canvas = {    width,    height,    style: { width: `${width}px`, height: `${height}px` },  };  ctx.fontHeightRatio = 2;  ctx.globalAlpha = 1;  // for some reason, SvgCanvas does not provide `.resetTransform()` so using  // `setTransform()` to set to the identity matrix, which is effectively the  // same.  ctx.resetTransform = () => ctx.setTransform(1, 0, 0, 1, 0, 0);  // 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, plugins });  } finally {    if (savedGradient) {      globalThis.CanvasGradient = savedGradient;    }  }
  return ctx.render(new Rect2D(0, 0, width, height), "px");}