• Uni app map full parsing + Event Monitoring


    Recently, I found a boutique article on map solutions of uni app, which I share with you here, hoping to help you Reprint address: https://blog.csdn.net/cplvfx/article/details/111447466 Precondition: you need to read https://uniapp.dcloud.io/component/map Look at the picture first   Event listening – attribute description This watch is also official The ones marked in red are those I […]

  • Two ways of introducing Gaode map


    Method 1: useamap-jsapi-loader plug-in unit Step 1   NPM install plug-in NPM install @amap/amap-jsapi-loader –save   Step 2 Create map component The code of the vmap/index page is as follows: import { uuid } from “@/utils/tools”; import AMapLoader from “@amap/amap-jsapi-loader”; export default {   data() {     return {       uuid: uuid(8),   […]

  • Get the province, city, longitude and latitude by name (Baidu map API)


    <!DOCTYPE html> <html lang=”zh-cmn-Hans”> <meta charset=”GBK”> <meta name=”viewport” content=”width=device-width,initial-scale=1,user-scalable=0″> <title> Baidu map api</title> <script type=”text/javascript”></script> <!– If you need to drag the mouse to operate, you can import the following JS file — > <script type=”text/javascript”></script> <style type=”text/css”> Body, HTML {width: 100%; height: 100%; overflow-y: Auto; margin:0; font family: “Microsoft YaHei”;} </style> </head> <body> <div […]

  • Quickly solve the problem of concurrent read and write security of golang map


    1、 Error cases package main import ( “fmt” “time” ) var TestMap map[string]string func init() { TestMap = make(map[string]string, 1) } func main() { for i := 0; i < 1000; i++ { go Write(“aaa”) go Read(“aaa”) go Write(“bbb”) go Read(“bbb”) } time.Sleep(5 * time.Second) } func Read(key string) { fmt.Println(TestMap[key]) } func Write(key string) […]

  • Solve the problem of unstable results of golang map range traversal


    Less gossip. This article mainly wants to introduce a common problem in golang development. However, this problem is often easy for beginners to fall into the pit. problem When I wrote a piece of code, I used the map data structure of golang to cache the counting results with map. Simply put, the keys of […]

  • Detailed explanation of a* algorithm of routing algorithm


    preface In the actual development, we often use the path finding algorithm. For example, in the mmoarpg game Warcraft, in order to imitate the experience of real people walking, the characters will choose the nearest route to reach the destination. During this period, they will avoid mountains or lakes, bypass boxes or trees, and go […]

  • Go modify map slice array element value


    The value of the data generated in the “range” statement is actually a copy of the set element. They are not references to the original elements. This means that updating these values will not modify the original data. Let’s take a direct look at the segment example: package main import “fmt” func main() { data […]

  • Using GeoServer to publish GPS track roadmap with large amount of data based on PostGIS


    1. introduction The GPS track generated by human beings in the process of walking or driving is a kind of sampling of the road. According to the GPS track route, we can deduce the existence of the road, and according to the density of the track, we can deduce the heat and importance of the […]

  • Implementation of third-party map navigation in fluent


    Knowledge preparation Here, the flutter third-party map navigation is implemented. The simplest way is to call the third-party map client; However, the coordinate systems used by various map clients are not necessarily the same. First, learn about the following common coordinate systems: WGS84 coordinate system: that is, the earth coordinate system, which is the international […]

  • Java implementation writes data to the map type field of hive


    Write data to the map type field of hive The field type of the table is map<string, string> The type of this attribute of the corresponding class needs to be defined as string, not map<string, string>!! Method 1: Create table statement defines the separator of map: row format delimited fields terminated by ‘|’ collection items […]

  • Map custom tags used by Tencent map JavaScript API


    Tencent location service JavaScript API is a map application programming interface developed by JavaScript language. On this basis, Tencent location service has launched its upgraded version of JavaScript API GL, which is a set of 3D version map API encapsulated based on the high-performance 3D rendering engine implemented by webgl. The 3D vision is more […]

  • Django Sitemap


    A website map is a navigation page generated according to the structure, framework and content of a website. It is a container for all links of a website. Website map can facilitate search engines or web spiders to grab website pages and increase the collection probability of website content pages. 1. Add sitemap map app […]