反应谷歌地图中的替代路线

Question

我在react-google-maps库中使用示例。

const { compose, withProps, lifecycle } = require("recompose");
const {
withScriptjs,
withGoogleMap,
GoogleMap,
DirectionsRenderer,
} = require("react-google-maps");
const MapWithADirectionsRenderer = compose(
withProps({
googleMapURL: "https://maps.googleapis.com/maps/api/js?key=AIzaSyC4R6AN7SmujjPUIGKdyao2Kqitzr1kiRg&v=3.exp&libraries=geometry,drawing,places",
loadingElement: <div style={{ height: `100%` }} />,
containerElement: <div style={{ height: `400px` }} />,
mapElement: <div style={{ height: `100%` }} />,
}),
withScriptjs,
withGoogleMap,
lifecycle({
componentDidMount() {
const DirectionsService = new google.maps.DirectionsService();
DirectionsService.route({
origin: new google.maps.LatLng(41.8507300, -87.6512600),
destination: new google.maps.LatLng(41.8525800, -87.6514100),
travelMode: google.maps.TravelMode.DRIVING,
}, (result, status) => {
if (status === google.maps.DirectionsStatus.OK) {
this.setState({
directions: result,
});
} else {
console.error(`error fetching directions ${result}`);
}
});
}
})
)(props =>
<GoogleMap
defaultZoom={7}
defaultCenter={new google.maps.LatLng(41.8507300, -87.6512600)}
>
{props.directions && <DirectionsRenderer directions={props.directions} />}
</GoogleMap>
);
<MapWithADirectionsRenderer />

我想在地图中启用替代路线。所以我用

provideRouteAlternatives: true

所以在回调函数内部

(result, status) => { }

结果有一个属性路由，它是一组备用路由。 如何将这些路线渲染到地图中？我还想单击路线，它们会将颜色从活动更改为非活动。当用户选择我需要在名为的服务器上发送的路由时

overview_polyline

它位于 routes 数组内部，其中数组中的每个路由都具有此属性。 谢谢。

Answer 1

如果您只想在地图上渲染这些路线，则可以使用该库中的 DirectionsRenderer。

https://tomchentw.github.io/react-google-maps/#directionsrenderer

但是，此 DirectionsRenderer 组件不能像定义颜色或 onClick 函数那样完全自定义。您可以做的是使用标记和多边形创建自定义的方向组件，这些组件也来自此库。以下是我是如何制作的：

import React, { Component } from 'react';
import { Polyline, Marker } from 'react-google-maps';
import { pinkA200, blue500 } from 'material-ui/styles/colors';
import ntol from 'number-to-letter';
import _ from 'lodash';
const DirectionMarker = ({ data, isEnd, i, onClick }) => {
const { start_location, end_location } = data;
if (isEnd) {
return [
<Marker onClick={onClick} position={start_location} label={ntol(i)} key="end0" />,
<Marker onClick={onClick} position={end_location} label={ntol(i + 1)} key="end1" />
];
}
return <Marker onClick={onClick} position={start_location} label={ntol(i)} />;
};      
const Direction = ({ direction, isEnd, i, onClick, isSelected }) => {
const data = direction.routes[0].legs[0];
const path = data.steps.reduce((sum, current) => _.concat(sum, current.path), []);
return [
<DirectionMarker data={data} onClick={onClick} isEnd={isEnd} i={i} key="marker" />,
<Polyline
onClick={onClick}
path={path}
options={{
strokeColor: isSelected ? pinkA200 : blue500,
strokeOpacity: 0.6,
strokeWeight: 6
}}
key="line"
/>
];
};
class Directions extends Component {
constructor(props) {
super(props);
this.state = { selectedSegment: 0 };
}
render() {
const { directions } = this.props;
if (_.isEmpty(directions)) {
return false;
}
return directions.map((d, i) => {
const directionProps = {
direction: d,
i,
key: i,
onClick: () => this.setState({ selectedSegment: i }),
isEnd: i === directions.length - 1,
isSelected: i === this.state.selectedSegment
};
return <Direction {...directionProps} />;
});
}
}
export default Directions;