Tencent location service JavaScript API GL development guide 1: epidemic situation marker

Dream eraser 2021-01-21 00:49:20
tencent location service javascript api


Write it at the front

Eraser recently studied some cases of map data presentation , I've been looking for a practical tool

After a search , I really found a , Tencent location service , Because of the tutorial , You can click on the following link first , Create an account , Most of the features are now free to use .

https://lbs.qq.com?lbs_invite=KZ2RFLK

Next, I'll bring you a few blogs about location-based services .

JavaScript API And Data visualization API

Because Tencent has many related functions in location service , I mainly use the following two parts .
 Tencent location service JavaScript API GL Development guide 1 : Epidemic marker
The official description is summarized as :

Javascript API GL Is based on WebGL technology-built 3D Version map API,3D More freedom of vision , More fluid interaction .
Provide rich function interface , Including some 、 Line 、 Face painting , Custom layer 、 Personalized styles and drawings 、 Ranging tools, etc , Make it easier for developers to implement product ideas .
Give full play to GPU The ability of parallel computing , At the same time combined with WebWorker Multithreading technology , Greatly improves the rendering performance of large amount of data . Up to mega points 、 Line 、 Face painting , At the same time, it can keep running at high frame rate .

For these , The eraser doesn't care much about , As long as it is easy to use , Easy to use , It's easy to get started .

First step : Apply for one Key

Similar applications need to initialize a Key, In order to facilitate the subsequent development of various functions , So go to the console , The first Key Good configuration .
 Tencent location service JavaScript API GL Development guide 1 : Epidemic marker

The second step : As a good JS library , Must have an online test environment

Tested it , Tencent's location-based service is doing well .

https://lbs.qq.com/webApi/javascriptGL/glGuide/glBasic

The development documents are relatively clear , It can be debugged online directly .

 Tencent location service JavaScript API GL Development guide 1 : Epidemic marker

Through the coordinate picker , Get it 【 Hebei Garden Expo Park 】 Coordinates of , Then fill in the corresponding address in the longitude and latitude position of the code on the right side of the figure above .

https://lbs.qq.com/tool/getpoint/index.html

The core code is as follows :

<script type="text/javascript">
function initMap() {

var center = new TMap.LatLng(38.144609, 114.61384);
// Initialize map 
var map = new TMap.Map("container", {

rotation: 20, // Set the map rotation angle 
pitch: 30, // Set pitch angle (0~45)
zoom: 12, // Set the map zoom level 
center: center, // Set the coordinates of the map center point 
});
}
</script>

The third step : Complete the first small case : Epidemic marker

This blog , To complete a small case of Shijiazhuang epidemic , Epidemic marker function , Because only do Demo Demonstrate the use of , What we need to prepare are :

  1. The location of the diagnosis
  2. Search coordinates by location
  3. Map marker

Find a confirmed case , Location: xiaoguozhuang .

 Tencent location service JavaScript API GL Development guide 1 : Epidemic marker
Find the interface of address to coordinate :https://lbs.qq.com/service/webService/webServiceGuide/webServiceGeocoder

Through online testing , The corresponding data are as follows , Check the coordinate data .

 Tencent location service JavaScript API GL Development guide 1 : Epidemic marker
Request address is :

//GET Request example , Pay attention to the parameter values URL code
https://apis.map.qq.com/ws/geocoder/v1/?address= The address you need &key= Yours Key

And this place uses Key, Need to be configured WebserviceAPI, Otherwise, the following error will occur :

{ "status": 199, "message":
" this key Did not open WebserviceAPI function , You can log in to lbs.qq.com, Access control key Management interface , Find this key And set enable WebserviceAPI"
}

 Tencent location service JavaScript API GL Development guide 1 : Epidemic marker
According to the instructions , take qq.com After setting, you can use the online environment provided by Tencent .
 Tencent location service JavaScript API GL Development guide 1 : Epidemic marker
The tag code is as follows :

 <script>
var center = new TMap.LatLng(38.292732, 114.747902);// Set the coordinates of the center point 
// Initialize map 
var map = new TMap.Map("container", {

center: center
});
// initialization marker
var marker = new TMap.MultiMarker({

id: "marker-layer", // Layers id
map: map,
styles: {
 // Related styles of point annotation 
"marker": new TMap.MarkerStyle({

"width": 25,
"height": 35,
"anchor": {
 x: 16, y: 32 },
"src": "https://mapapi.qq.com/web/lbs/javascriptGL/demo/img/markerDefault.png"
})
},
geometries: [{
 // Point annotation data array 
"id": "demo",
"styleId": "marker",
"position": new TMap.LatLng(38.292732, 114.747902),
"properties": {

"title": "marker"
}
}]
});
</script>

The final operation effect :
 Tencent location service JavaScript API GL Development guide 1 : Epidemic marker

Step four : Get the track of confirmed patients in batch , Split location information

have access to Python Language crawls data , In the analysis of text information , Mark all the places on the map , So you can get a trajectory map .

Pay attention to the decimal of latitude and longitude in the above code , Otherwise, the coordinates will shift a lot .

First time using Tencent location service experience

The documentation is very clear , It's faster to start , The online test environment is very efficient , You can apply to use it .

Click the link to register directly :https://lbs.qq.com?lbs_invite=KZ2RFLK

版权声明
本文为[Dream eraser]所创,转载请带上原文链接,感谢
https://javamana.com/2021/01/20210121004830939d.html

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