CN105426148A - Multi-terminal-screen synchronization method based on vectorgraph - Google Patents
Multi-terminal-screen synchronization method based on vectorgraph Download PDFInfo
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- CN105426148A CN105426148A CN201510764750.0A CN201510764750A CN105426148A CN 105426148 A CN105426148 A CN 105426148A CN 201510764750 A CN201510764750 A CN 201510764750A CN 105426148 A CN105426148 A CN 105426148A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
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Abstract
The invention relates to a multi-terminal-screen synchronization method based on a vectorgraph. The method comprises the following steps: client terminals log in a TCP (Transmission Control Protocol) server through a login interface; the client terminal who owns a spokesman permission initializes a screen synchronization request; each client terminal who logs in the server responds to the screen synchronization request which is initialized by the client terminal who owns the spokesman permission, and a screen enters a synchronization state; the client terminal who owns the spokesman permission opens a file which needs to be synchronized; and the screen of the client terminal and the screen of the client terminal who initializes the screen synchronization request synchronously change. The multi-terminal-screen synchronization method based on the vectorgraph reduces transmission contents and lowers network time delay; each terminal renders pages according to the variable quantity of a shared file so as to be compatible with a plurality of platforms and different resolutions; handwritten contents are transmitted in real time through a vector format, and other terminals can see the change of the handwritten contents; and therefore, the control of screen synchronization and screen operation can be realized.
Description
Technical field
The present invention relates to a kind of screen synchronization method, specifically, relate to a kind of multiple terminals screen synchronization method based on vector graphics.
Background technology
At present at various electric terminal, as: under the environment such as smart mobile phone, panel computer, conventional P C, all can relate to the problem of screen synch.Such as: when teaching, the content that this teacher's device screen shows all shown by the screen that teacher wishes all student's equipment; When meeting, the device screen that host wishes participant all shows content that spokesman's device screen shows etc.
Under existing technology, screen synch generally all adopts by the content of whole screen frame by frame, is shared with other people in the mode of screenshot capture.Because the data volume of each frame of screen is all larger, a lot of problem will be produced like this when transmission, as: the content of transmission is picture, need to take a large amount of bandwidth, easily cause network delay, if in order to eliminate time delay, then must reduce image quality, having had a strong impact on Consumer's Experience.
If very high by the screen resolution sharing people, or everyone device resolution is inconsistent, and at this time in order to allow a lot of people can show content on screen fast, the content so transmitted just must be compressed; The not fogging bad impact such as clear will be caused like this.
If the user at scene has multiple different equipment, the existing technology also good mode of neither one is gone to solve many equipment and is shared simultaneously, and the problem of low delay, high pixel.
And screen when most meeting and teaching is shared, all can operate based on certain file, as: PPT, PDF etc.If at this time reduce resolution, the problems such as the word on file does not see will be caused.
The major defect of prior art shows: 1. adopt picture frame transmission mode, take massive band width; 2. network delay is serious, affects Consumer's Experience; 3. cannot the terminal of each resolution perfect adaptive, there is the sharpness of picture, resolution loss between high-low resolution; 4. cannot good compatible multiple platform, be also mainly be embodied in picture transmission to have delay, sharpness not high enough; 5. do not carry out special optimization for teaching, meeting; As needs are hand-written on file, removing Screen sharing software, what also need on special software simulating file is hand-written.
Summary of the invention
For above-mentioned deficiency of the prior art, the invention provides a kind of raising transmission speed, reduce network delay, the multiple terminals screen synchronization method based on vector graphics applied widely.
The technical solution used in the present invention is:
Based on a multiple terminals screen synchronization method for vector graphics, comprise the steps:
Client terminal logs in TCP server by login interface;
After client terminal logon server, server is given according to the account title logging in client terminal and is logged in the corresponding user right of client terminal;
TCP server is to the client terminal transmission screen synchronizer logged in;
Client terminal runs screen synch device;
The file that screen synch device Download Server stores;
User right comprises: normal user permission, spokesman's authority and administrator right;
The client terminal having spokesman's authority initiates screen synch request;
The screen synch request that the client terminal that each client terminal response signing in server has spokesman's authority is initiated, screen enters synchronous regime;
The client terminal having spokesman's authority is opened and is needed to carry out synchronous file;
The operation information of the client terminal of initiating screen synch request is transferred to server by the client terminal screen synch device of initiating screen synch request;
The operation information of the client terminal of initiating screen synch request is transferred to all client terminals signing in server by server;
Sign in each client terminal screen synch device parse operation information of server, the screen of each client terminal changes with the screen synch of the client terminal of initiating screen synch request;
Initiate the client terminal close file of screen synch request, exit screen synch request, sign in each client terminal close file of server and exit screen synch state.
Normal user permission: the least privilege of system, client terminal screen can only be synchronous by other client terminals, until the client terminal of initiating screen synch request exit screen synch, and cannot jump out in synchronizing process that this is synchronous;
Spokesman's authority: client terminal is when current nobody initiates screen synch; Initiate screen synch instruction; The screen of client terminal is synchronous by client terminal, then in synchronizing process, also cannot jump out screen synch;
Administrator right: jump out screen synch at any time, stop synchronous, spokesman's authority of closing other people of any client terminal.
Server sends heartbeat to client terminal; If client terminal screen synch device does not receive heartbeat, client terminal will reconnect server.
The client behaviour initiating screen synch request carries out signing operation on the synchronous file opened.
Sign operation and comprise hand-written, input through keyboard and erasing.
The Vector Message of signing operation is carried out serializing by the client initiating screen synch request, and the Vector Message of serializing is transferred to server; Server broadcast Vector Message is to the client terminal of logon server.
The Vector Message of serializing resolved by the client screen synchronizer of logon server;
The Vector Message of the serializing after resolving is superimposed upon on the file opened by the client screen synchronizer of logon server.
The Vector Message of server saving sequence.
During client terminal logon server, the client terminal having spokesman's authority has initiated screen synch request;
Client terminal screen synch device is opened and synchronous documents according to the positional information when the file of front opening and the file page number, convergent-divergent, slip that server stores; According to the Vector Message that server stores Vector Message is superimposed upon on the file opened, in order to the user allowing midway log in also enters the state of screen synch.
The client terminal of initiation screen synch request completes screen synch or keeper terminates screen synch operations;
The client terminal having spokesman's authority gets screen synch operations authority again, in order to the user allowing midway log in also enters the state of screen synch.
The beneficial effect of hinge structure of the present invention:
The present invention is based on the multiple terminals screen synchronization method of vector graphics, be applicable to the multiple terminals screen synch at the enterprising line operate of file such as meeting, teaching; Adopt the variable quantity of the page number of transmission shared file, handwriting, sliding position to replace traditional frame transmission, greatly reduce the content of transmission, thus reduce network delay; Each terminal plays up the page according to shared file variable quantity, thus compatibility multiple platform and different resolution; Hand-written content by vector format real-time Transmission, thus is accomplished, a people is hand-written, and other ends can see the change of handwritten content; System adopts TCP to connect, and sees authority by the read-write that certain mode controls each terminal, thus achieves the control of screen synch, screen operator.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the multiple terminals screen synchronization method that the present invention is based on vector graphics.
Embodiment
Referring to drawings and Examples, the present invention will be described in detail:
Accompanying drawing 1 is known, and a kind of multiple terminals screen synchronization method based on vector graphics, comprises the steps:
Client terminal logs in TCP server by login interface;
After client terminal logon server, server is given according to the account title logging in client terminal and is logged in the corresponding user right of client terminal;
TCP server is to the client terminal transmission screen synchronizer logged in;
Client terminal runs screen synch device;
The file that screen synch device Download Server stores;
User right comprises: normal user permission, spokesman's authority and administrator right;
The client terminal having spokesman's authority initiates screen synch request;
The screen synch request that the client terminal that each client terminal response signing in server has spokesman's authority is initiated, screen enters synchronous regime;
The client terminal having spokesman's authority is opened and is needed to carry out synchronous file;
The operation information of the client terminal of initiating screen synch request is transferred to server by the client terminal screen synch device of initiating screen synch request;
The operation information of the client terminal of initiating screen synch request is transferred to all client terminals signing in server by server;
Sign in each client terminal screen synch device parse operation information of server, the screen of each client terminal changes with the screen synch of the client terminal of initiating screen synch request;
Initiate the client terminal close file of screen synch request, exit screen synch request, sign in each client terminal close file of server and exit screen synch state.
Normal user permission: the least privilege of system, client terminal screen can only be synchronous by other client terminals, until the client terminal of initiating screen synch request exit screen synch, and cannot jump out in synchronizing process that this is synchronous;
Spokesman's authority: client terminal is when current nobody initiates screen synch; Initiate screen synch instruction; The screen of client terminal is synchronous by client terminal, then in synchronizing process, also cannot jump out screen synch;
Administrator right: jump out screen synch at any time, stop synchronous, spokesman's authority of closing other people of any client terminal.
Server sends heartbeat to client terminal; If client terminal screen synch device does not receive heartbeat, client terminal will reconnect server.
The client behaviour initiating screen synch request carries out signing operation on the synchronous file opened.
Sign operation and comprise hand-written, input through keyboard and erasing.
The Vector Message of signing operation is carried out serializing by the client initiating screen synch request, and the Vector Message of serializing is transferred to server; Server broadcast Vector Message is to the client terminal of logon server.
The Vector Message of serializing resolved by the client screen synchronizer of logon server;
The Vector Message of the serializing after resolving is superimposed upon on the file opened by the client screen synchronizer of logon server.
The Vector Message of server saving sequence.
During client terminal logon server, the client terminal having spokesman's authority has initiated screen synch request;
Client terminal screen synch device is opened and synchronous documents according to the positional information when the file of front opening and the file page number, convergent-divergent, slip that server stores; According to the Vector Message that server stores Vector Message is superimposed upon on the file opened, in order to the user allowing midway log in also enters the state of screen synch.
The client terminal of initiation screen synch request completes screen synch or keeper terminates screen synch operations;
The client terminal having spokesman's authority gets screen synch operations authority again, in order to the user allowing midway log in also enters the state of screen synch.
The present invention is based on the multiple terminals screen synchronization method of vector graphics, be applicable to the multiple terminals screen synch at the enterprising line operate of file such as meeting, teaching; Adopt the variable quantity of the page number of transmission shared file, handwriting, sliding position to replace traditional frame transmission, greatly reduce the content of transmission, thus reduce network delay; Each terminal plays up the page according to shared file variable quantity, thus compatibility multiple platform and different resolution; Hand-written content by vector format real-time Transmission, thus is accomplished, a people is hand-written, and other ends can see the change of handwritten content; System adopts TCP to connect, and sees authority by the read-write that certain mode controls each terminal, thus achieves the control of screen synch, screen operator.
The form in preservation screen synch form on the server and synchronizing process is related in screen synch process.The screen synch form wherein preserved on the server is in order to the user that adds of midway can be made to enter into screen synch state rapidly, and the screen synch form in synchronizing process is then to allow the screen message of other device synchronization main equipments under screen synch state.
Server storing screen synch form is:
In this data structure, (represented by []) in outermost array, a daughter element (being represented by { }) represents the information of signing of signing people comprised in one page and the vector lines positional information of signing thereof.Suppose in outermost array, there are 2 daughter elements, so illustrate that this vector graphics has two pages.
Ground floor daughter element describes some vector graphics, and the implication of concrete field is as follows:
Filename: synchronous filename.
Page: data are at which page, and wherein 0 is start page.
Zoom: file zoom factor.
X, y: the coordinate points of the upper left corner respective file of screen.
Datas: the array of writing signing content, a daughter element in array represents one " lines " or " word ".
The concrete field meanings of datas daughter element is as follows:
Type: vector graphics type, be divided into " text " and " line ", wherein, text represents Word message, and line represents line information.
The daughter element that to be below word type be " text ":
Text: the detailed content of word.
The width of height character area; Width: the height of character area.
The daughter element that to be below word type be " line ":
Width: line thickness
Points: the array of lines mid point.
Cy, cx: the x of point, y-axis coordinate.
Data layout in synchronizing process:
1, slip screen
X, y represent which position sliding into current page respectively, and page represents to slide into which page.
Zoom represents current scale value.
2, hand-written:
Type: represent lines or word respectively.
If lines:
X, y represent the position of hand-written point respectively.Width represents width.
Status:0 represents first point of a hand-written line, and 1 represents middle point.2 last point representing a hand-written line.
As long as each point is coupled together in hand-written process.
If word:
X, y, width, height determine the position of word.
Text represents the content of word.
Claims (10)
1., based on a multiple terminals screen synchronization method for vector graphics, it is characterized in that comprising the steps:
Client terminal logs in TCP server by login interface;
After client terminal logon server, server is given according to the account title logging in client terminal and is logged in the corresponding user right of client terminal;
TCP server is to the client terminal transmission screen synchronizer logged in;
Client terminal runs screen synch device;
The file that screen synch device Download Server stores;
User right comprises: normal user permission, spokesman's authority and administrator right;
The client terminal having spokesman's authority initiates screen synch request;
The screen synch request that the client terminal that each client terminal response signing in server has spokesman's authority is initiated, screen enters synchronous regime;
The client terminal having spokesman's authority is opened and is needed to carry out synchronous file;
The operation information of the client terminal of initiating screen synch request is transferred to server by the client terminal screen synch device of initiating screen synch request;
The operation information of the client terminal of initiating screen synch request is transferred to all client terminals signing in server by server;
Sign in each client terminal screen synch device parse operation information of server, the screen of each client terminal changes with the screen synch of the client terminal of initiating screen synch request;
Initiate the client terminal close file of screen synch request, exit screen synch request, sign in each client terminal close file of server and exit screen synch state.
2., according to claim 1 based on the multiple terminals screen synchronization method of vector graphics, it is characterized in that:
Normal user permission: the least privilege of system, client terminal screen can only be synchronous by other client terminals, until the client terminal of initiating screen synch request exit screen synch, and cannot jump out in synchronizing process that this is synchronous;
Spokesman's authority: client terminal is when current nobody initiates screen synch; Initiate screen synch instruction; The screen of client terminal is synchronous by client terminal, then in synchronizing process, also cannot jump out screen synch;
Administrator right: jump out screen synch at any time, stop synchronous, spokesman's authority of closing other people of any client terminal.
3., according to claim 1 based on the multiple terminals screen synchronization method of vector graphics, it is characterized in that:
Server sends heartbeat to client terminal; If client terminal screen synch device does not receive heartbeat, client terminal will reconnect server.
4. according to claim 1 based on the multiple terminals screen synchronization method of vector graphics, it is characterized in that: the client behaviour initiating screen synch request carries out signing operation on the synchronous file opened.
5. according to claim 4 based on the multiple terminals screen synchronization method of vector graphics, it is characterized in that: sign operation and comprise hand-written, input through keyboard and erasing.
6., according to claim 5 based on the multiple terminals screen synchronization method of vector graphics, it is characterized in that:
The Vector Message of signing operation is carried out serializing by the client initiating screen synch request, and the Vector Message of serializing is transferred to server; Server broadcast Vector Message is to the client terminal of logon server.
7., according to claim 6 based on the multiple terminals screen synchronization method of vector graphics, it is characterized in that:
The Vector Message of serializing resolved by the client screen synchronizer of logon server;
The Vector Message of the serializing after resolving is superimposed upon on the file opened by the client screen synchronizer of logon server.
8., according to claim 7 based on the multiple terminals screen synchronization method of vector graphics, it is characterized in that:
The Vector Message of server saving sequence.
9., according to claim 8 based on the multiple terminals screen synchronization method of vector graphics, it is characterized in that:
During client terminal logon server, the client terminal having spokesman's authority has initiated screen synch request;
Client terminal screen synch device is opened and synchronous documents according to the positional information when the file of front opening and the file page number, convergent-divergent, slip that server stores; Vector Message is superimposed upon on the file opened according to the Vector Message that server stores.
10., according to claim 9 based on the multiple terminals screen synchronization method of vector graphics, it is characterized in that:
The client terminal of initiation screen synch request completes screen synch or keeper terminates screen synch operations;
The client terminal having spokesman's authority gets screen synch operations authority again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510764750.0A CN105426148A (en) | 2015-11-11 | 2015-11-11 | Multi-terminal-screen synchronization method based on vectorgraph |
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| CN201510764750.0A CN105426148A (en) | 2015-11-11 | 2015-11-11 | Multi-terminal-screen synchronization method based on vectorgraph |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106774900A (en) * | 2016-12-19 | 2017-05-31 | 广州中国科学院先进技术研究所 | One kind writes interactive system and method |
| CN110392063A (en) * | 2019-08-27 | 2019-10-29 | 深圳市威屏科技有限公司 | Electronic whiteboard method of data synchronization, device, equipment and medium |
| CN112818635A (en) * | 2021-02-03 | 2021-05-18 | 广州市保伦电子有限公司 | Multi-person synchronous document sharing and browsing method and processing terminal |
| WO2021218794A1 (en) * | 2020-04-30 | 2021-11-04 | 北京字节跳动网络技术有限公司 | Information sharing method, apparatus, electronic device, and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106774900A (en) * | 2016-12-19 | 2017-05-31 | 广州中国科学院先进技术研究所 | One kind writes interactive system and method |
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| WO2021218794A1 (en) * | 2020-04-30 | 2021-11-04 | 北京字节跳动网络技术有限公司 | Information sharing method, apparatus, electronic device, and storage medium |
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| CN112818635A (en) * | 2021-02-03 | 2021-05-18 | 广州市保伦电子有限公司 | Multi-person synchronous document sharing and browsing method and processing terminal |
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Application publication date: 20160323 |
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