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+import React, { useState, useRef, useLayoutEffect } from 'react';
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+import Taro from '@tarojs/taro';
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+import { View, Canvas } from '@tarojs/components';
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+import uChartsClass from '../lib/u-charts-original.js';
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+import type { ChartsConfig, TouchEvent } from '../lib/u-charts-original';
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+import type { ExtendedCanvasContext } from '../types';
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+
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+/**
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+ * PieChartFCExample 组件
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+ *
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+ * FC 示例组件（基于 docs/小程序图表库示例/taro-2d饼状图class使用示例.md）
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+ * 使用原始 u-charts.js + Canvas 2D API
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+ *
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+ * 用于与 BaseChartOriginal2D 进行对比调试
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+ */
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+interface PieChartFCExampleProps {
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+ /** Canvas 元素的 ID，必须唯一 */
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+ canvasId?: string;
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+ /** 图表宽度（像素），默认为屏幕宽度 */
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+ width?: number;
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+ /** 图表高度（像素），默认根据宽高比计算 */
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+ height?: number;
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+}
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+
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+function PieChartFCComponent(props: PieChartFCExampleProps) {
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+ const { canvasId = 'HPTdeOYFgaHlwidEmFOZkYTRwhnebAad', width = 750, height = 500 } = props;
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+
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+ const [cWidth, setCWidth] = useState(750);
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+ const [cHeight, setCHeight] = useState(500);
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+ const [pixelRatio, setPixelRatio] = useState(1);
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+
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+ // 使用 ref 存储图表实例
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+ const uChartsInstanceRef = useRef<Record<string, any>>({});
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+
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+ const drawCharts = (id: string, data: any) => {
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+ const query = Taro.createSelectorQuery();
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+ query.select('#' + id).fields({ node: true, size: true }).exec(res => {
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+ if (res[0]) {
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+ const canvas = res[0].node;
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+ const ctx = canvas.getContext('2d') as ExtendedCanvasContext;
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+ const chart = new uChartsClass({
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+ type: "pie",
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+ context: ctx,
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+ width: canvas.width,
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+ height: canvas.height,
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+ series: data.series,
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+ animation: true,
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+ background: "#FFFFFF",
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+ color: ["#1890FF","#91CB74","#FAC858","#EE6666","#73C0DE","#3CA272","#FC8452","#9A60B4","#ea7ccc"],
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+ padding: [5,5,5,5],
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+ enableScroll: false,
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+ extra: {
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+ pie: {
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+ activeOpacity: 0.5,
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+ activeRadius: 10,
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+ offsetAngle: 0,
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+ labelWidth: 15,
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+ border: false,
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+ borderWidth: 3,
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+ borderColor: "#FFFFFF"
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+ }
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+ }
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+ } as ChartsConfig);
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+ uChartsInstanceRef.current[id] = chart;
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+ const series = data.series;
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+ console.log('[PieChartFCExample] 图表初始化完成:', id, {
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+ cWidth, cHeight,
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+ canvasWidth: canvas.width,
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+ canvasHeight: canvas.height,
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+ seriesLength: series.length,
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+ series,
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+ });
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+ } else {
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+ console.error("[PieChartFCExample]: 未获取到 context");
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+ }
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+ });
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+ }
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+
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+ const getServerData = () => {
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+ //模拟从服务器获取数据时的延时
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+ setTimeout(() => {
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+ //模拟服务器返回数据，如果数据格式和标准格式不同，需自行按下面的格式拼接
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+ let res = {
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+ series: [
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+ {
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+ data: [{"name":"一班","value":50},{"name":"二班","value":30},{"name":"三班","value":20},{"name":"四班","value":18},{"name":"五班","value":8}]
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+ }
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+ ]
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+ };
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+ drawCharts(canvasId, res);
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+ }, 500);
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+ }
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+
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+ const tap = (e: any) => {
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+ uChartsInstanceRef.current[e.currentTarget.id]?.touchLegend(e);
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+ uChartsInstanceRef.current[e.currentTarget.id]?.showToolTip(e);
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+ }
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+
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+ useLayoutEffect(() => {
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+ console.debug('[PieChartFCExample] useLayoutEffect')
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+ const sysInfo = Taro.getSystemInfoSync();
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+ const pr = sysInfo.pixelRatio;
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+ //这里的第一个 750 对应 css .charts 的 width
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+ const cw = width / 750 * sysInfo.windowWidth;
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+ //这里的 500 对应 css .charts 的 height
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+ const ch = height / 750 * sysInfo.windowWidth;
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+ setCWidth(cw);
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+ setCHeight(ch);
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+ setPixelRatio(pr);
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+
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+ // 直接在这里获取数据
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+ getServerData();
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+ }, [width, height, canvasId]);
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+
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+ const canvasProps = { style: { width: cWidth, height: cHeight } };
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+ return (
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+ <View>
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+ <Canvas
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+ {...canvasProps}
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+ canvas-id={canvasId}
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+ id={canvasId}
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+ type="2d"
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+ className="charts"
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+ onTouchEnd={tap}
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+ />
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+ </View>
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+ );
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+}
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+
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+// 默认导出
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+export default PieChartFCComponent;
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+
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+// 命名导出，保持向后兼容
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+export const PieChartFCExample = PieChartFCComponent;
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