android - 在两个标记 map-box react-native 之间画一条线？

Question

我能够实现创建 marker (注释)在 map 上使用 react-native 中的以下代码.

import React, { Component } from 'react';
import {
  Platform,
  StyleSheet,
  Text,
  View
} from 'react-native';
import MapboxGL from '@mapbox/react-native-mapbox-gl';
import Mapbox from '@mapbox/react-native-mapbox-gl';


const columbusCircleCoordinates = [
  -73.98197650909422, 40.768793007758816
];

Mapbox.setAccessToken('your access key');

export default class App extends Component {

  renderAnnotations () {
    return (
      <Mapbox.PointAnnotation
        key='pointAnnotation'
        id='pointAnnotation'
        coordinate={[11.254, 43.772]}>

        <View style={styles.annotationContainer}>
          <View style={styles.annotationFill} />
        </View>
        <Mapbox.Callout title='Look! An annotation!' />
      </Mapbox.PointAnnotation>
    )
  }

  render() {
    return (
      <View style={styles.container}>
        <Mapbox.MapView
            styleURL={Mapbox.StyleURL.Street}
            zoomLevel={15}
            centerCoordinate={[11.256, 43.770]}
            showUserLocation={true}
            style={styles.container}>
            {this.renderAnnotations()}
        </Mapbox.MapView>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  annotationContainer: {
    width: 30,
    height: 30,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: 'white',
    borderRadius: 15,
  },
  annotationFill: {
    width: 30,
    height: 30,
    borderRadius: 15,
    backgroundColor: 'orange',
    transform: [{ scale: 0.6 }],
  }
});

但是从教程中我发现我们能够绘制 polylines在 mapbox使用 <MapboxGL.LineLayer /> .但是有关于如何执行此操作的适当示例。

谁能给我提供 sample code如何绘制 line在 mapbox 上的两个注释之间react-native .

Answer 1

就像我在之前的回答中分享的那样:在您的状态下，有一个变量是 linestring 类型的 geojson。这需要两个以上的坐标，这基本上是您通过该线的点数。 “很棒的”mapbox 文档在向您显示 polyline 标记时忽略提及的是，您需要将其包装在 MapboxGL 标记下的 shapeSource 标记中。在 this.state 中，我放置了一个名为 route 的 geojson 变量。也许使用以下代码示例会更有意义:

import React, {Component} from 'react';
import {


 Platform,
  StyleSheet,
  Text,
  View,
  Button
} from 'react-native';
import MapboxGL from '@mapbox/react-native-mapbox-gl';

MapboxGL.setAccessToken('your access key');

export default class App extends Component {
  constructor() {
    super();
    this.state = {
      route:
        {
          "type": "FeatureCollection",
          "features": [
            {
              "type": "Feature",
              "properties": {},
              "geometry": {
                "type": "LineString",
                "coordinates": [
                  [
                    11.953125,
                    39.436192999314095
                  ],
                  [
                    18.896484375,
                    46.37725420510028
                  ]
                ]
              }
            }
          ]
        },   
    }
  }

  render() {
    return (
      <View style={styles.container}>
        <MapboxGL.MapView
          styleURL={MapboxGL.StyleURL.Light}
          zoomLevel={15}
          centerCoordinate={[11.256, 43.770]}
          style={styles.container}> 
          <MapboxGL.ShapeSource id='line1' shape={this.state.route}>
            <MapboxGL.LineLayer id='linelayer1' style={{lineColor:'red'}} />
          </MapboxGL.ShapeSource>

        </MapboxGL.MapView>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
});