CN116579753A - Multi-department collaborative drawing method capable of online communication and system thereof - Google Patents
Multi-department collaborative drawing method capable of online communication and system thereof Download PDFInfo
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Abstract
The invention provides a multi-department collaborative drawing method capable of realizing online communication and a system thereof, which are based on WebSocket and Fetch long polling technology to keep communication between a browser and a server, and a user directly realizes the function of real-time communication on the browser; the method comprises the steps that a user draws a point, line and plane graph, graph data are packaged into GeoJSON and transmitted to a server, then the server pushes the data to each client, the client analyzes and draws a received message, and then two or more other users can synchronously see the graph drawn by the user in a map container of a browser; and after the drawing is completed, storing the collaborative drawing result into a database. The invention solves the problems existing in the traditional map drawing, helps multiple departments to realize collaborative drawing, is convenient for different professionals of different departments to communicate and exchange, omits a complicated means in the middle, ensures that the drawing result can be timely and accurately fed back, and ensures the real-time performance and the effectiveness of information transmission.
Description
Technical Field
The invention provides a multi-department collaborative drawing method capable of online communication and a system thereof, belonging to the technical field of geographic information.
Background
The problems to be solved in modern society are more and more complex, and collaborative decisions are needed to be made across departments and even across industries. Taking traffic weather service as an example, the impact of weather on traffic activity is very important. According to statistics of traffic management departments, in the national highway accidents, the accidents in the weather of thick fog, thin ice, snow, heavy rain and strong wind account for 39% of the total number of the accidents. Meteorological disasters and induced geological disasters are important factors causing road blockage, road sealing, even direct traffic interruption, induced traffic accidents, citizen life and property and direct economic loss. The meteorological data is managed and maintained by each department. To better accomplish the traffic weather service, sharing of data and co-creation of thematic maps are necessarily required.
However, due to the unstructured nature of geospatial data, thematic mapping has long continued in a stand-alone mode of operation. The whole process from the editing process of the thematic data to the element design of the thematic map to the compiling of the thematic map is carried out by a single GIS engineer in a relatively 'closed' environment.
The number of professional high quality drawing staff is limited, so that the number of experts capable of grasping global work to carry out comprehensive drawing is smaller, the traditional single GIS software has to be used for drawing, the traditional GIS map drawing work is generally carried out in a labor division mode, finally, the comprehensive method is adopted, the modification opinion is often fed back in a non-timely manner, a large number of repeated redundant works are caused, and the efficiency of the drawing work is affected. The single-machine operation system is not beneficial to the sharing of expert experience and data; and the collaborative drawing work of multiple departments is more unfavorable. The method is used for solving the practical problems of low efficiency, low accuracy, slow response and the like in the map drawing work, and is a necessary path for cooperation of multiple departments.
CN112070861a proposes a method and apparatus for multiplexing single collaborative drawing of a power distribution network GIS wire diagram. The method is based on a power grid modeling request, and a single line diagram is obtained; calling a service interface of a power geographic information system, and detecting whether geographic information corresponding to a single line diagram is updated along a first stage of layout; when a detection result of updating the geographic information along the first stage of the layout is obtained, responding to user operation, opening a power geographic information system, and updating the updated geographic information to a single line diagram along the layout so as to perform the first stage updating; submitting the graphical audit. By adopting the method, the production system and the electric power geographic information system can share data, so that the work order interlocking of the power grid GIS platform and the production system is reduced, and the work efficiency of maintaining the single line diagram is improved. Aiming at a power grid single line diagram, the method realizes data updating according to a modeling request, and cannot realize real-time updating display.
CN108536723B proposes a multi-user real-time synchronous collaborative map editing method and system taking geographical features into account. The method realizes multi-user data synchronization and sharing based on local replication on demand, combines different roles of project division, utilizes dynamic lock and Socket-based message transmission to realize concurrent control taking geographical feature constraint conditions into consideration, and provides a concurrent conflict resolution method combining 'prior' intervention with 'after' program automation and manual intervention. The invention enables a plurality of items to be carried out on the platform at the same time; a plurality of operators edit map data with larger data volume and more image spots on a certain layer on a data server at the same time; meanwhile, quality inspectors perform quality inspection, technical problem processing and even parallel conflict judging on editing results made by operators; project management personnel monitor the progress and quality in real time and timely adjust task partitions, so that the production efficiency and the product quality can be improved, and the overall benefit of large-scale data production is improved. The method locally replicates the geospatial data as required to realize multi-user data synchronization and sharing. But there is redundancy in the data and the transmission pressure is large. The map data conflict resolution is placed at the server side, so that the operation pressure of the server is increased.
He Liesong (He Liesong, liu Haiyan, huang Limin, etc.) A Map Editing Long Transaction (MELT) model was designed using map editing transaction model simulated by map documents [ J ]. University of Wuhan university journal (information science edition), 2021,46 (4): 561-569, he Liesong. Collaborative mapping key technology research based on map editing long transaction model [ D ]. Strategic support army information engineering university, 2020.). The map editing transaction is simulated based on the state of the map document and the change thereof, the definition of space coordinates, attributes, geometry, relations and the like is supported, the map editing transaction is described by the change of the state of the map document, the map editing transaction is stored and organized by using the backup data and the change data of the map document, and an efficient transaction processing means is provided for collaborative drawing. The method adopts a long transaction model, and the update of the space database is asynchronous, so that the space database cannot be updated in time after the map editing is completed; with the map document backup data, there is also a problem of data redundancy.
Disclosure of Invention
The invention provides a multi-department collaborative drawing method capable of online communication and a system thereof, which aim to solve the following technical problems:
1. the demands for collaborative drawing are increasingly strong, and online collaborative drawing is realized in webgis environment.
2. And providing an online communication function while carrying out online collaborative drawing, and realizing real-time communication with respect to the drawing of the map.
3. And synchronously updating map views of different users, and realizing what you see is what you get.
The invention provides a multi-department collaborative drawing method capable of online communication. The method is based on the WebSocket and Fetch long polling technology to keep communication between the browser and the server, and a user can directly realize the function of real-time communication on the browser, so that the user can conveniently communicate. When the map is drawn cooperatively, a user draws point, line and plane figures. The graphic data are packed into GeoJSON and transmitted to the server, then the server pushes the data to each client, and the clients analyze and draw the received information, so that two or more other users can synchronously see the graphic drawn by the user in the map container of the browser. After the drawing is completed, the collaborative drawing result can be saved and stored in a database.
The specific method comprises the following steps:
(1) The client starts collaborative drawing, and establishes connection with the server by utilizing WebSocket; the WebSocket protocol realizes bidirectional communication between the client and the server, and allows the server to actively push data to all clients when the data is updated or received. The browser sends a connection request to the server, the server completes first handshake through HTTP, brings out WebSocket connection parameters, responds to the connection request, completes connection between the server and the WebSocket connection parameters, and performs data transmission and exchange;
(2) The client is connected with the server based on WebSocket to realize text communication;
(3) The client draws the graph; the drawing process is that the client JavaScript completes the capture of the graphic boundary and the resolution of the conflict;
(4) After drawing the graph, packaging the graph into GeoJSON by JavaScript, and sending the GeoJSON to a server by using the JavaScript; the server WEB and the XML server analyze the data packet to obtain a graph;
(5) The Fetch long polling mechanism sends a GeoJSON obtaining request to a server based on the connection between a client and a server; the return value of the request will be given to the fetchPromise variable; promise records the execution state;
(6) The server returns the graphic data to the Fetch engine in a GeoJSON form through a WEB and XML server;
(7) The acquisition operation is successful, the Promise state changes, the Promise calls a processing function, a Response object containing the Response of the server is transmitted, and the processing function is utilized to analyze the GeoJSON data packet, so that the graph updating drawing is completed.
GeoJSON is a format that encodes various geographical data structures, and is based on the geospatial information data exchange format of Javascript object notation (JSON). The GeoJSON object may represent a geometry, feature, or set of features. GeoJSON supports the following geometrical types: points, lines, facets, multi-points, multi-lines, multi-facets, and geometric sets. The features in GeoJSON contain a geometric object and other attributes, and the feature set represents a series of features.
The webGIS, namely a network geographic information system, is developed from the traditional geographic information system technology, and refers to a comprehensive geographic information platform which can realize geographic information release, sharing of geographic space data and operation functions on the geographic information based on the network technology. The map can be sent to the server in a service release mode, so that a user can view on-line geographic information resources by directly using various browsers, and the functions of inquiring geographic space information, processing data, drawing and the like in the GIS are realized by adopting the HTTP protocol to communicate with the Web server.
Although currently the network geographic information system is not as functional as the desktop sis software. However, the WebGIS system is simple to use, can realize rapid update pushing of real-time data, and has strong cross-platform property, so that the development direction of the WebGIS becomes the development direction of the future mainstream of the GIS. At present, the application based on the WebGIS can complete more and more GIS functions, and the WebGIS technology is widely applied to the GIS field.
CSCW, i.e. collaborative work under computer support, is used to study how a group of users fully co-work under computer support, especially Web support, to accomplish a user's target tasks. Under the internet environment, the CSCW is often combined with the network technology, and combines the cooperative work technology under the network environment, so that not only can the goal of performing cooperative work across different computers be well realized, but also the finished work content of a certain engineer computer cannot be lost due to hardware or software faults of the engineer computer. Web-based collaborative techniques have become an important development in CSCW.
Based on the above situation, the invention provides a system based on WebGIS and CSCW, which helps solve the problems existing in the traditional map drawing, helps multiple departments to realize collaborative drawing, facilitates communication between different professionals in different departments, omits a complicated means in the middle, ensures that the drawing result can be fed back timely and accurately, and ensures the real-time performance and effectiveness of information transmission.
The technical scheme of the invention has the beneficial effects that:
1. the invention provides a new method for cross-department online collaborative drawing;
2. the method synchronously updates the views of different users, and realizes the view;
3. the map data related to the invention realizes graphic capture and conflict check at the client, has no data redundancy and is simple and convenient to operate.
Drawings
FIG. 1 is a schematic diagram of the online communication multi-department collaborative drafting method of the invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a system architecture diagram of the present invention;
FIG. 4 is a flow chart of a collaborative rendering module of the present invention;
FIG. 5 is a collaborative rendering result of an embodiment;
FIG. 6 is a collaborative drawn clear button effect diagram of an embodiment;
fig. 7 is an online communication effect diagram of an embodiment.
Detailed Description
The specific technical scheme of the invention is described by combining the embodiments.
A multi-department collaborative drawing method capable of online communication comprises the following steps:
(1) And the client starts collaborative drawing, and establishes connection with the server by utilizing WebSocket. The WebSocket protocol can realize bidirectional communication between the client and the server, and allows the server to actively push data to all clients when the data is updated or received. The browser sends a connection request to the server, the server completes first handshake through HTTP, brings out WebSocket connection parameters, and responds to the connection request, and the server completes connection between the server and the WebSocket connection parameters to perform data transmission and exchange. As shown in fig. 1.
(2) The client is connected with the server based on WebSocket to realize text communication.
(3) And the client performs graphic drawing. The drawing process is completed by client JavaScript to capture the graphic boundary and resolve the conflict.
(4) After the graph is drawn, the graph is packaged into GeoJSON by JavaScript, and the GeoJSON is sent to a server by JavaScript. And the server WEB and the XML server analyze the data packet to obtain a graph.
(5) The Fetch long polling mechanism sends a request to get GeoJSON to the server based on the connection between the client and the server. The return value of the request will be given to the fetchPromise variable. Promise may record the execution status.
(6) The server returns the graphics data in the form of GeoJSON to the Fetch engine through the WEB and XML servers.
(7) The acquisition operation is successful, the Promise state changes, the Promise calls a processing function, a Response object containing the Response of the server is transmitted, and the processing function is utilized to analyze the GeoJSON data packet, so that the graph updating drawing is completed.
Based on the method shown in fig. 2, the invention provides a system which allows a plurality of users to operate the same map item on line at the same time, instantly shares drawing results, and can also realize real-time online communication. The system greatly improves the drawing efficiency. The system adopts HTML, CSS, javaScript and React frames as front end display, node. Js as background B/S frames, fetch is used for front and back end communication, and MySQL is used for relational databases. The overall framework of the system is shown in fig. 3.
The data service layer consists of a relational database MySQL and a spatial database. And providing data read-write service by node. JS is an operating environment of JS codes operated on a server by using a V8 engine, so that a client and the server can adopt a unified programming language, and a developer can easily develop high-concurrency Web applications.
The business logic layer consists of a management module, a map operation module and a collaborative drawing module. The management module is responsible for verifying the user name and the password of the user, and if corresponding data exist in the database, the user enters a main page of the system through verification; if the user name and password have an error, the main page cannot be accessed and the error cause is popped up. The map operation module is responsible for basic map operation, and can realize basic map related operations such as scaling, roaming, viewing of attribute information, map view angle switching and the like of a map by using a JavaScript open source library such as MapBoxGLJS, BMapGLLib and the like. The collaborative drawing module realizes the collaborative drawing function of different users by using the method, and realizes the consistent real-time display of the map graphics of different user interfaces.
The Web service layer provides communication services for the front end and the back end by nodes. The Fetch technology is the latest method, a user interface sends a Fetch request to a server through JavaScript, the Fetch request is sent to the server through HTTP, the processing result is returned to a Fetch engine through the WEB and the XML server in a Promise format, the processing result is transmitted to a client through the Fetch engine, and the processing result is rendered into an HTML+CSS return value client user interface by using a corresponding method.
The user presentation layer is responsible for providing a user interface, providing an operation interface for a user, and realizing page drawing, display and refreshing for data returned by the server. MapBox GLJS is a JS library provided by MapBox corporation, and realizes the rendering of map elements, so that the map elements have better visual effect and very smooth interactivity.
The system realizes the core collaborative drawing function, and comprises the following three parts: the flow of the functions of industry data loading, map collaborative drawing and online real-time communication is shown in fig. 4.
In the embodiment, the related system keeps communication between the browser and the server based on the WebSocket technology and the Fetch long polling technology, and a user can directly realize the function of real-time communication on the browser, so that the user can conveniently communicate. In the collaborative drawing interface, when a user draws by using the point, line and plane symbols provided by the map JS library, the graphic data drawn by the web page is packaged and transmitted to the server, then the server pushes the data to each client, and the client analyzes and draws the received information, so that two or more other users can be realized, and the graphic drawn by the user can be synchronously seen in the map container of the browser. After the drawing is completed, the collaborative drawing result can be saved and stored in a database. The collaborative drawing result is shown in fig. 5.
After clicking the clear button, the drawing data on the interface is completely cleared, as shown in fig. 6.
The online communication function realizes that information of different users is sent to the main interface in real time, and information of other users can be seen, and an effect diagram of the online communication module is shown in fig. 7.
Claims (3)
1. A multi-department collaborative drawing method capable of realizing online communication is characterized in that communication between a browser and a server is maintained based on WebSocket and Fetch long polling technology, and a user directly realizes a function of real-time communication on the browser; the method comprises the steps that a user draws a point, line and plane graph, graph data are packaged into GeoJSON and transmitted to a server, then the server pushes the data to each client, the client analyzes and draws a received message, and then two or more other users can synchronously see the graph drawn by the user in a map container of a browser; and after the drawing is completed, storing the collaborative drawing result into a database.
2. A multi-department collaborative mapping method according to claim 1, comprising the steps of:
(1) The client starts collaborative drawing, and establishes connection with the server by utilizing WebSocket; the WebSocket protocol realizes the two-way communication between the client and the server, and allows the server to actively push data to all clients when the data is updated or received; the browser sends a connection request to the server, the server completes first handshake through HTTP, brings out WebSocket connection parameters, responds to the connection request, completes connection between the server and the WebSocket connection parameters, and performs data transmission and exchange;
(2) The client is connected with the server based on WebSocket to realize text communication;
(3) The client draws the graph; the drawing process is that the client JavaScript completes the capture of the graphic boundary and the resolution of the conflict;
(4) After drawing the graph, packaging the graph into GeoJSON by JavaScript, and sending the GeoJSON to a server by using the JavaScript; the server WEB and the XML server analyze the data packet to obtain a graph;
(5) The Fetch long polling mechanism sends a GeoJSON obtaining request to a server based on the connection between a client and a server; the return value of the request will be given to the fetchPromise variable; promise records the execution state;
(6) The server returns the graphic data to the Fetch engine in a GeoJSON form through a WEB and XML server;
(7) The acquisition operation is successful, the Promise state changes, the Promise calls a processing function, a Response object containing the Response of the server is transmitted, and the processing function is utilized to analyze the GeoJSON data packet, so that the graph updating drawing is completed.
3. The multi-department collaborative drawing system capable of online communication is characterized by being used for simultaneously operating the same map item by a plurality of users on line, sharing drawing results instantly and realizing real-time online communication;
HTML, CSS, javaScript is combined with a reaction frame to be used as a front end display, node. Js is used as a background B/S frame, fetch is used for front and back end communication, and MySQL is used for a relational database;
comprising the following steps:
the data service layer consists of a relational database MySQL and a spatial database;
the business logic layer consists of a management module, a map operation module and a collaborative drawing module; the management module is responsible for verifying the user name and the password of the user, and if corresponding data exist in the database, the user enters a main page of the system through verification; if the user name and the password have an error, the main page cannot be accessed, and the error reason is popped up; the map operation module is responsible for basic map operation and realizes basic operation related to the map; the collaborative drawing module is used for realizing collaborative drawing functions of different users and realizing consistent real-time display of map graphics of different user interfaces;
the Web service layer provides communication services for the front end and the rear end by node.js and fetch; the Fetch technology is the latest method, a user interface sends a Fetch request to a server through JavaScript, the Fetch request is sent to the server through HTTP, the WEB and the XML server return processing results to a Fetch engine through the WEB and the XML server in a Promise format, the processing results are transmitted to a client through the Fetch engine, and the processing results are rendered into an HTML+CSS return value client user interface by using a corresponding method;
and the user presentation layer is responsible for providing a user interface, providing an operation interface for a user and realizing page drawing, display and refreshing for data returned by the server.
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