CurveLine 弧线组件
===
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[](https://www.npmjs.com/package/@uiw/react-baidu-map-curve-line)
[](https://www.npmjs.com/package/@uiw/react-baidu-map-curve-line)
使用浏览器的矢量制图工具（如果可用）在地图上绘制弧线的地图叠加层，当前组件自动加载 [CurveLine.min.js](https://api.map.baidu.com/library/CurveLine/1.5/src/CurveLine.min.js) 包，加载完成将会有个 `window.BMapLib` 的全局对象。
```jsx
import { CurveLine, useCurveLine } from '@uiw/react-baidu-map';
// 或者单独安装使用
import CurveLine, { useCurveLine } from '@uiw/react-baidu-map-curve-line';
```
### 基本用法
```jsx mdx:preview
import React, { useState } from 'react';
import { Map, CurveLine, APILoader } from '@uiw/react-baidu-map';
const Example = () => {
const [enableEditing, setEnableEditing] = useState(false);
const [strokeOpacity, setStrokeOpacity] = useState(0.5);
function curveLineRef(props) {
if (props && props.curveLine) {
console.log('curveLine:', props.curveLine, props.map, props.BMapLib);
}
}
return (
<>
);
}
const Demo = () => (
);
export default Demo;
```
### 使用 hooks
`curveLine`, `setCurveLine`, `path`, `setPath`, `BMapLib`
```jsx mdx:preview
import React from 'react';
import { useRef, useEffect, useState } from 'react';
import { Map, APILoader, Provider, useMap, useCurveLine } 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: 8,
enableScrollWheelZoom: true,
widget: ['GeolocationControl', 'NavigationControl']
});
const { curveLine } = useCurveLine({ map,
enableEditing, strokeOpacity,
path: [
{ lng: 118.798544, lat: 32.076761 },
{ lng: 120.785452, lat: 30.759355 },
{ lng: 120.895835, lat: 31.974881 },
],
});
useCurveLine({ map,
path: [
{ lng: 118.770948, lat: 30.9419 },
{ lng: 120.583081, lat: 31.313834 },
{ lng: 121.484549, lat: 31.226918 },
],
});
useEffect(() => {
if (divElm.current) {
setContainer(divElm.current);
}
});
useEffect(() => {
if (map && curveLine) {
if (enableEditing) {
curveLine.enableEditing();
} else {
curveLine.disableEditing();
}
}
}, [enableEditing]);
useEffect(() => {
if (map && curveLine) {
curveLine.setStrokeOpacity(strokeOpacity);
}
}, [strokeOpacity]);
return (
<>
)
}
const Demo = () => (
);
export default Demo;
```
### Props
| 参数 | 说明 | 类型 | 默认值 |
| ----- | ----- | ----- | ----- |
| visiable | 覆盖物是否可见。 | `boolean` | - |
| strokeColor | 折线颜色 | String | - |
| strokeWeight | 折线的宽度，以像素为单位 | Number | - |
| strokeOpacity | 折线的透明度，取值范围0 - 1 | Number | - |
| strokeStyle | 折线的样式，solid或dashed | String | - |
| enableMassClear | 是否在调用map.clearOverlays清除此覆盖物，默认为true | Boolean | - |
| enableEditing | 是否启用线编辑，默认为false | Boolean | `false` |
| enableClicking | 是否响应点击事件，默认为true | Boolean | - |
| icons | 配置贴合折线的图标 | IconSequence[] | - |
### 事件
| 参数 | 说明 | 类型 |
| ----- | ----- | ----- |
| onClick | 点击折线后会触发此事件 | (event: { type: string, target: any, point: Point, pixel: Pixel }): void; |
| onDblClick | 双击折线后会触发此事件 | (event: { type: string, target: any, point: Point, pixel: Pixel }): void; |
| onMouseDown | 鼠标在折线上按下触发此事件 | (event: { type: string, target: any, point: Point, pixel: Pixel }): void; |
| onMouseUp | 鼠标在折线释放触发此事件 | (event: { type: string, target: any, point: Point, pixel: Pixel }): void; |
| onMouseOut | 鼠标离开折线时触发此事件 | (event: { type: string, target: any, point: Point, pixel: Pixel }): void; |
| onMouseOver | 当鼠标进入折线区域时会触发此事件 | (event: { type: string, target: any, point: Point, pixel: Pixel }): void; |
| onRemove | 移除折线时触发 | (event: { type: string, target: any }): void; |
| onLineUpdate | 覆盖物的属性发生变化时触发 | (event: { type: string, target: any }): void; |
