设置:
使用React-Map-Gl的基本React应用程序在顶部显示带有甲板的映射。
目标:
1)将点显示为给定半径和颜色的圆圈。
2)当用户单击一个圆圈时,工具提示/弹出窗口应显示更多有关它的数据(包括在提供的数据中),直到用户单击(本质上与此图相同,但对于单击而不是悬停,http:/http://UBER.github.io/deck.gl/#/documentation/layer-catalog/scatterplot-layer。FYI我查看了此代码,并且已删除了悬停逻辑,我假设为简单起见)。
问题:
我已经完成了第1点,但我无法获得点2的工作。我最远的是要证明数据是登录到控制台的。
注意:
我没有与React -tooltip结婚 - 如果有更好的方法来做到这一点,我不介意完全将其取出。我只需要保留mapbox和deck.gl。
数据:https://gist.github.com/nikkichristofi/bf79ca37028b29b50cffb215360db999
deckgl-overlay.js
import React, {Component} from 'react';
import ReactTooltip from 'react-tooltip';
import DeckGL, {ScatterplotLayer} from 'deck.gl';
export default class DeckGLOverlay extends Component {
static get defaultViewport() {
return {
longitude: 0,
latitude: 0,
zoom: 2,
maxZoom: 16,
pitch: 0,
bearing: 0
};
}
# in this method I want to update the variable tooltipText with
# whatever object data has been clicked.
# The console log successfully logs the right data (i.e. the third
# element in the array), but the tooltip doesn't even show
onClickHandler = (info) => {
let dataToShow = info ? info.object[2] : "not found";
this.tooltipText = dataToShow;
console.log(dataToShow);
}
render() {
const {viewport, lowPerformerColor, highPerformerColor, data, radius, smallRadius, largeRadius} = this.props;
if (!data) {
return null;
}
const layer = new ScatterplotLayer({
id: 'scatter-plot',
data,
radiusScale: radius,
radiusMinPixels: 0.25,
getPosition: d => [d[1], d[0], 0],
getColor: d => d[2] > 50 ? lowPerformerColor : highPerformerColor,
getRadius: d => d[2] < 25 || d[2] > 75 ? smallRadius : largeRadius,
updateTriggers: {
getColor: [lowPerformerColor, highPerformerColor]
},
pickable: true,
onClick: info => this.onClickHandler(info),
opacity: 0.3
});
return (
<DeckGL {...viewport} layers={ [layer] } data-tip={this.tooltipText}>
<ReactTooltip />
</DeckGL>
);
}
}
app.js
import React, {Component} from 'react';
import {render} from 'react-dom';
import MapGL from 'react-map-gl';
import DeckGLOverlay from './deckgl-overlay.js';
import {json as requestJson} from 'd3-request';
const MAPBOX_TOKEN = process.env.MAPBOX_TOKEN; // eslint-disable-line
const lowPerformerColor = [204, 0, 0];
const highPerformerColor = [0, 255, 0];
const smallRadius = 500;
const largeRadius = 1000;
const DATA_URL = 'https://gist.github.com/NikkiChristofi/bf79ca37028b29b50cffb215360db999';
export default class App extends Component {
constructor(props) {
super(props);
this.state = {
viewport: {
...DeckGLOverlay.defaultViewport,
width: 500,
height: 500
},
data: null
};
requestJson(DATA_URL, (error, response) => {
if (!error) {
console.log(response);
this.setState({data: response});
}
else{
console.log(error);
}
});
}
componentDidMount() {
window.addEventListener('resize', this._resize.bind(this));
this._resize();
}
_resize() {
this._onViewportChange({
width: window.innerWidth,
height: window.innerHeight
});
}
_onViewportChange(viewport) {
this.setState({
viewport: {...this.state.viewport, ...viewport}
});
}
render() {
const {viewport, data} = this.state;
return (
<MapGL
{...viewport}
onViewportChange={this._onViewportChange.bind(this)}
mapboxApiAccessToken={MAPBOX_TOKEN}
mapStyle='mapbox://styles/mapbox/dark-v9'>
<DeckGLOverlay viewport={viewport}
data={data}
lowPerformerColor={lowPerformerColor}
highPerformerColor={highPerformerColor}
smallRadius={smallRadius}
largeRadius={largeRadius}
radius={300}
/>
</MapGL>
);
}
}
弄清楚了一种方法。
解决方案
我将OnClick事件冒泡到MAPGL层,并使用弹出元素显示数据。
so app.js:
1)从React-Map-Gl
import MapGL, { Popup } from 'react-map-gl';
2)设置坐标状态和"信息"(在弹出窗口中显示)
constructor(props) {
super(props);
this.state = {
viewport: {
...DeckGLOverlay.defaultViewport,
width: 500,
height: 500
},
data: null,
coordinates: [-0.13235092163085938,51.518250335096376],
info: "Hello"
};
3)创建使用新数据设置状态的回调方法(信息将是数据中的元素,虽然可以是您想在弹出窗口中显示的任何内容)
myCallback = (info) => {
console.log(info);
if(info){
this.setState({coordinates: info.lngLat, info: info.object[2]});
}
}
4)渲染弹出窗口并在甲板上引用回调方法
return (
<MapGL
{...viewport}
{...this.props}
onViewportChange={this._onViewportChange.bind(this)}
mapboxApiAccessToken={MAPBOX_TOKEN}
mapStyle='mapbox://styles/mapbox/dark-v9'>
<Popup
longitude={this.state.coordinates[0]}
latitude={this.state.coordinates[1]}>
<div style={style}>
<p>{this.state.info}</p>
</div>
</Popup>
<DeckGLOverlay viewport={viewport}
data={data}
lowPerformerColor={lowPerformerColor}
highPerformerColor={highPerformerColor}
smallRadius={smallRadius}
largeRadius={largeRadius}
radius={300}
callbackFromParent={this.myCallback}
/>
</MapGL>
);
和deckgl-overlay.js:
1)将数据信息提供给父母的(app.js)方法
onClick: info => this.props.callbackFromParent(info),
(显然删除了Deckoverlay.js中的React-Tooltip元素和OnClick Event Handler进行清理)
对于任何阅读想要使用自定义弹出案的人或像ANTD这样的第三方库中的任何人,不支持确切的位置作为道具,我只是通过创建一个问题来解决这个问题 <div style={{ position: 'absolute', left: x, top: y}} />
充当弹出窗口的子节点。X和Y最初设置为0:
const [selectedPoint, setSelectedPoint] = useState({});
const [x, setX] = useState(0);
const [y, setY] = useState(0);
,然后在GeojSonlayer中设置为onClick:
const onClick = ({ x, y, object }) => {
setSelectedPoint(object);
setX(x);
setY(y);
};
const layer = new GeoJsonLayer({
id: "geojson-layer",
data,
pickable: true,
stroked: false,
filled: true,
extruded: true,
lineWidthScale: 20,
lineWidthMinPixels: 2,
getFillColor: [0, 0, 0, 255],
getRadius: 50,
getLineWidth: 1,
getElevation: 30,
onClick
});
这种方法的不利之处是,弹出窗口将不会留在地图被缩放/放大的情况下,因为x和y是视口坐标,而land和long和long。