Polyline 折线组件

使用浏览器的矢量制图工具（如果可用）在地图上绘制折线的地图叠加层。

import { Polyline, usePolyline } from '@uiw/react-baidu-map';
// 或者单独安装使用
import Polyline, { usePolyline } from '@uiw/react-baidu-map-polyline';

基本用法

`jsx mdx:preview import React, { useState } from 'react'; import { Map, Polyline, APILoader } from '@uiw/react-baidu-map';

const Example = () => { const [isHiden, setIsHiden] = useState(true); const [enableEditing, setEnableEditing] = useState(false); const [strokeOpacity, setStrokeOpacity] = useState(0.9); return ( <> <button onClick={() => setIsHiden(!isHiden)}>{isHiden ? "隐藏" : "显示"}</button> <button onClick={() => setEnableEditing(!enableEditing)}>{enableEditing ? '取消编辑' : '编辑'}</button> <button onClick={() => setStrokeOpacity(0.7)}>透明度0.7</button> <button onClick={() => setStrokeOpacity(0.2)}>透明度0.2</button> <Map zoom={13} center="北京" widget={['NavigationControl']} style={{ height: 350 }}> {isHiden && ( <Polyline enableEditing={enableEditing} strokeOpacity={strokeOpacity} path={[ { lng: 116.399, lat: 39.910 }, { lng: 116.405, lat: 39.920 }, { lng: 116.423493, lat: 39.907445 }, ]} /> )} {isHiden && ( <Polyline enableEditing={enableEditing} strokeOpacity={strokeOpacity} path={[ { lng: 116.399, lat: 39.920977 }, { lng: 116.385243, lat: 39.913063 }, { lng: 116.394226, lat: 39.917988 }, { lng: 116.401772, lat: 39.921364 }, { lng: 116.41248, lat: 39.927893 }, ]} /> )} </Map> </> ); }

const Demo = () => ( <div style={{ width: '100%' }}> <APILoader akay="eYpCTECSntZmw0WyoQ7zFpCRR9cpgHFG"> <Example /> </APILoader> ); export default Demo;

### 使用 hooks

`polyline`, `setPolyline`, `path`, `setPath`

```jsx mdx:preview
import React from 'react';
import { useRef, useEffect, useState } from 'react';
import { Map, APILoader, Provider, useMap, usePolyline } from '@uiw/react-baidu-map';

const Example = () => {
  const [enableEditing, setEnableEditing] = useState(false);
  const [strokeOpacity, setStrokeOpacity] = useState(0.9);
  const divElm = useRef(null);
  const { setContainer, map } = useMap({
    zoom: 13,
    center: '北京',
    widget: ['GeolocationControl', 'NavigationControl']
  });
  const { polyline } = usePolyline({ map,
    enableEditing, strokeOpacity,
    path: [
      { lng: 116.387112, lat: 39.920977 },
      { lng: 116.385243, lat: 39.913063 },
      { lng: 116.394226, lat: 39.917988 },
      { lng: 116.401772, lat: 39.921364 },
      { lng: 116.41248, lat: 39.927893 },
    ],
  });
  usePolyline({ map,
    path: [
      { lng: 116.399, lat: 39.910 },
      { lng: 116.405, lat: 39.920 },
      { lng: 116.423493, lat: 39.907445 },
    ],
  });
  useEffect(() => {
    if (divElm.current) {
      setContainer(divElm.current);
    }
  });
  useEffect(() => {
    if (map) {
      // 启用滚轮放大缩小，默认禁用
      map.enableScrollWheelZoom();
    }
  }, [map]);

  useEffect(() => {
    if (map && polyline) {
      if (enableEditing) {
        polyline.setFillColor('red');
        polyline.enableEditing();
      } else {
        polyline.setFillColor('transparent');
        polyline.disableEditing();
      }
    }
  }, [enableEditing]);

  useEffect(() => {
    if (map && polyline) {
      polyline.setStrokeOpacity(strokeOpacity);
    }
  }, [strokeOpacity]);

  return (
    <>
      <button onClick={() => setEnableEditing(!enableEditing)}>{enableEditing ? '取消编辑' : '编辑'}</button>
      <button onClick={() => setStrokeOpacity(0.7)}>透明度0.7</button>
      <button onClick={() => setStrokeOpacity(0.2)}>透明度0.2</button>
      <div ref={divElm} style={{ height: '100%' }} />
    </>
  )
}

const Demo = () => (
  <div style={{ width: '100%', height: '300px' }}>
    <APILoader akay="eYpCTECSntZmw0WyoQ7zFpCRR9cpgHFG">
      <Provider>
        <Example />
      </Provider>
    </APILoader>
  </div>
);
export default Demo;

Props

事件