CN112100140A - Electronic whiteboard file saving method, electronic whiteboard and computer storage medium - Google Patents
Electronic whiteboard file saving method, electronic whiteboard and computer storage medium Download PDFInfo
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Abstract
The embodiment of the application discloses an electronic whiteboard file saving method, an electronic whiteboard and a computer storage medium, which are used for keeping the sequence of a plurality of target objects in the creation time when the electronic whiteboard file is displayed. The method in the embodiment of the application comprises the following steps: the method comprises the steps of storing a plurality of target objects by adopting a chain type storage structure of a linked list, wherein the target objects have a sequence in the creation time, storing each target object in different nodes in sequence according to the sequence, and enabling a pointer of each node to point to the next target object determined according to the sequence, so that the target objects are connected according to the sequence of the creation time, each target object can be displayed according to the sequence when an electronic whiteboard file is displayed, and the disorder of the position relation of the target objects is avoided.
Description
Technical Field
The embodiment of the application relates to the field of electronic whiteboard equipment, in particular to an electronic whiteboard file saving method, an electronic whiteboard and a computer storage medium.
Background
The electronic whiteboard is a high and new technology product which integrates the research and development of a plurality of high-tech means such as the top-end electronic technology, the software technology and the like, and can realize paperless office and teaching by applying the electromagnetic induction principle and combining a computer and a projector. The electronic whiteboard has been developed from a common whiteboard, the earliest electronic whiteboard is a copy-type electronic whiteboard, and an interactive electronic whiteboard has appeared along with the development of technology and the market demand.
When a user writes on the electronic whiteboard, the content written in one page is stored, and when the user displays the content next time, the electronic whiteboard restores the content stored by the user on the whiteboard, and the user can edit the content again. However, when the user edits, the positional relationship of the plurality of contents in the page changes. For example, before editing, content a is located below content B, i.e., content B is occluded above content a; after the user finishes editing the content a, the content a is modified to obtain the sub-content a1 and the sub-content a2, but the sub-content a1 and the sub-content a2 are overlaid on the content B at this time, and the position relationship is changed, which is contradictory to the writing habit of the user because the user wants the content a to be still below the content B instead of appearing above the content B after the content a is modified.
Therefore, a solution for saving an electronic whiteboard is needed to ensure that the positional relationship among a plurality of contents in the electronic whiteboard remains unchanged after editing.
Disclosure of Invention
The embodiment of the application provides an electronic whiteboard file saving method, an electronic whiteboard and a computer storage medium, which are used for keeping the sequence of a plurality of target objects in the creation time when the electronic whiteboard file is displayed.
A first aspect of the embodiments of the present application provides an electronic whiteboard file saving method, including:
when a creation instruction of one target object is received, creating the target object corresponding to the creation instruction on the electronic whiteboard to obtain a plurality of target objects;
sequentially storing each target object in different nodes of a linked list according to the sequence of the creation time of the target objects to obtain an electronic whiteboard file;
each node of the linked list comprises a target object and a pointer, and the pointer points to the next target object determined according to the sequence.
A second aspect of the embodiments of the present application provides an electronic whiteboard, including:
the system comprises a creating unit, a processing unit and a processing unit, wherein the creating unit is used for creating a target object corresponding to a creating instruction on an electronic whiteboard to obtain a plurality of target objects when the creating instruction of one target object is received;
the storage unit is used for sequentially storing each target object in different nodes of a linked list according to the sequence of the creation time of the target objects to obtain an electronic whiteboard file;
each node of the linked list comprises a target object and a pointer, and the pointer points to the next target object determined according to the sequence.
A third aspect of the embodiments of the present application provides an electronic whiteboard, including:
the system comprises a processor, a memory, a bus and input and output equipment;
the processor is connected with the memory and the input and output equipment;
the bus is respectively connected with the processor, the memory and the input and output equipment;
when the processor user receives a creation instruction of one target object, creating the target object corresponding to the creation instruction on the electronic whiteboard to obtain a plurality of target objects; sequentially storing each target object in different nodes of a linked list according to the sequence of the creation time of the target objects to obtain an electronic whiteboard file;
each node of the linked list comprises a target object and a pointer, and the pointer points to the next target object determined according to the sequence.
A fourth aspect of embodiments of the present application provides a computer storage medium having instructions stored therein, which when executed on a computer, cause the computer to perform the method of the first aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
in the embodiment of the application, a chain storage structure of a linked list is adopted to store a plurality of target objects, and the target objects have a sequence in the creation time, so that each target object is stored in different nodes in sequence according to the sequence, and a pointer of each node points to a next target object determined according to the sequence, so that the target objects are connected according to the sequence of the creation time, each target object can be displayed according to the sequence when an electronic whiteboard file is displayed, and disorder of the position relationship of the target objects is avoided.
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Fig. 1 is a schematic view of an application scenario of an electronic whiteboard in an embodiment of the present application;
fig. 2 is a schematic flow chart of a method for saving an electronic whiteboard file in the embodiment of the present application;
FIG. 3 is a schematic diagram of a chain storage structure of a linked list in an embodiment of the present application;
fig. 4 is another schematic flow chart of a method for saving an electronic whiteboard file in the embodiment of the present application;
fig. 5 is a schematic diagram illustrating a target object displayed on an electronic whiteboard in an embodiment of the present application;
FIG. 6 is a schematic diagram of an alternative process of a node where a target writing is located in an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic whiteboard in an embodiment of the present application;
fig. 8 is another schematic structural diagram of an electronic whiteboard in the embodiment of the present application.
Detailed Description
The embodiment of the application provides an electronic whiteboard file saving method, an electronic whiteboard and a computer storage medium, which are used for keeping the sequence of a plurality of target objects in the creation time when the electronic whiteboard file is displayed.
Referring to fig. 1, an application scenario of an electronic whiteboard in the embodiment of the present application includes:
the electronic whiteboard 101 may specifically include a processor, a memory, and hardware such as a display screen, a projection device, etc., wherein the processor may create one or more target objects according to a target object creation instruction input by the user 102 on the electronic whiteboard, and implement positioning of a display position of the target object according to coordinate and other location information, and implement other electronic whiteboard writing functions.
The memory may be used to store an electronic whiteboard file saved by the user 102, that is, after the user 102 creates one or more target objects on the electronic whiteboard, the one or more target objects may be saved, thereby generating the electronic whiteboard file.
The projection device may project content to be displayed on a display screen, which may be used to display one or more target objects, and receive a creation instruction of a target object input by the user 102 on the display screen when the user 102 writes or draws on the display screen.
Specifically, the electronic whiteboard 101 may be an interactive whiteboard, a rear projection whiteboard, a copy whiteboard, or the like, and the specific type is not limited.
In addition, the electronic whiteboard 101 may be connected to an external device, such as a personal computer PC or a printer, so as to project the contents of the PC onto the display screen of the electronic whiteboard or print out the contents of the electronic whiteboard.
The electronic whiteboard file saving method in the embodiment of the present application is described below with reference to the application scenario of the electronic whiteboard in fig. 1:
referring to fig. 2, an embodiment of a method for saving an electronic whiteboard file in the embodiment of the present application includes:
201. when a creation instruction of one target object is received, creating the target object corresponding to the creation instruction on the electronic whiteboard to obtain a plurality of target objects;
the embodiment can be applied to an electronic whiteboard, and a user can write, draw and wipe in a page displayed on the electronic whiteboard by using an electronic induction pen or a finger, and can insert a picture or a video in the page displayed by the user. Therefore, each time the user writes or draws, or inserts a picture/video, a creation instruction of the target object is input to the electronic whiteboard, that is, the creation instruction indicates that the target object is created on the electronic whiteboard. When the electronic whiteboard receives a creation instruction of one target object, the target object corresponding to the creation instruction is created on the electronic whiteboard, so that a plurality of target objects are obtained.
The target object is any object that the user needs to create on the electronic whiteboard, including but not limited to handwriting, pictures, videos, or other visual data.
202. Sequentially storing each target object in different nodes of a linked list according to the sequence of the creation time of the plurality of target objects to obtain an electronic whiteboard file;
after the user creates the plurality of target objects, the user may save the plurality of target objects. Because the user creates the target objects in sequence, the target objects have a sequence in the creation time. In this embodiment, each target object is sequentially stored in different nodes of the linked list according to the sequence, where each node of the linked list includes one target object and a pointer, and the pointer points to a next target object determined according to the sequence.
As shown in FIG. 3, the linked list has a plurality of nodes, such as node 301 connecting node 302 and node 302 connecting node 303, thereby forming a chained storage structure. Each node includes a data area a for holding data and a pointer area B for pointing to the next node, the pointer in the pointer area typically being the storage address of the next node. Therefore, in this embodiment, the data area a may be used to store the target object, and the pointer in the pointer area B may point to the next target object determined according to the chronological order of the plurality of target objects in the creation time.
For example, after the user creates the target object 1 first, then creates the target object 2, if the target object 1 is stored in the node 301, the pointer of the node 301 points to the next target object of the target object 1, that is, the target object 2, the node 302 stores the target object 2, and so on, and different nodes of the linked list are used to store each target object according to the sequence of the target objects in the creation time.
In this embodiment, the linked list may be a single-direction linked list or a double-direction linked list, which is not limited herein.
After the target objects are stored in different nodes of the linked list, the target objects are stored as files, and then the electronic whiteboard file is obtained.
In this embodiment, a chain storage structure of a linked list is used to store a plurality of target objects, and the target objects have a precedence order in creation time, so that each target object is stored in different nodes in sequence according to the precedence order, and a pointer of each node points to a next target object determined according to the precedence order, so that the target objects are connected according to the precedence order of creation time, and each target object can be displayed according to the precedence order when an electronic whiteboard file is displayed, thereby avoiding a disorder of a positional relationship of the target objects.
The embodiments of the present application will be described in further detail below on the basis of the aforementioned embodiment shown in fig. 2. Referring to fig. 4, another embodiment of the method for saving an electronic whiteboard file in the embodiment of the present application includes:
401. when a creation instruction of one target object is received, creating the target object corresponding to the creation instruction on the electronic whiteboard to obtain a plurality of target objects;
in this embodiment, the electronic whiteboard receives a creation instruction of the target object from the user, which may be writing/drawing on a display screen of the electronic whiteboard by the user, so that the electronic whiteboard receives the creation instruction of the target object; or the user may annotate the display content on the display screen of the electronic whiteboard, or insert a picture/video, so that the electronic whiteboard receives the creation instruction of the target object. The present embodiment does not limit the way in which the user inputs the creation instruction.
And when a creation instruction is received every time, creating the target object according to the creation instruction to obtain a plurality of target objects.
402. Sequentially storing each target object in different nodes of a linked list according to the sequence of the creation time of the plurality of target objects to obtain an electronic whiteboard file;
in this embodiment, the target object includes one or more of handwriting, a picture, and a video. When the plurality of target objects comprise the handwriting, for the storage of the handwriting, each handwriting is sequentially stored in different nodes of the linked list according to the sequence of the creation time of the plurality of target objects; when the plurality of target objects comprise pictures, the embodiment sequentially stores the picture information of each picture in different nodes of the linked list according to the sequence of the creation time of the plurality of target objects; when the multiple target objects include videos, the present embodiment sequentially stores the video information of each video in different nodes of the linked list according to the sequence of the creation time of the multiple target objects.
As shown in fig. 3, assuming that the user creates handwriting a first, creates picture B, and creates video C last, if handwriting a is stored in node 301, node 302 will store the picture information of picture B, and node 303 will store the video information of video C.
Similarly, assuming that the user creates handwriting 1 first and then creates handwriting 2, if handwriting 1 is stored in the node 301, the node 302 stores handwriting 2, and so on, and stores each handwriting in different nodes according to the sequence of the creation time of the plurality of handwriting.
Similarly, assuming that the user creates the picture 1 first and then creates the picture 2, if the picture information of the picture 1 is stored in the node 301, the node 302 stores the picture information of the picture 2, and so on, and stores the picture information of each picture in different nodes according to the sequence of the creation time of the plurality of pictures.
The picture information comprises one or more items of storage paths of pictures, coordinates of the pictures and size information of display windows of the pictures; the video information includes one or more items of storage path of the video, coordinates of the video, and size information of a display window of the video.
The storage path of the picture or the video is used for representing the position for storing the picture or the video; the coordinates of the picture or the video can represent the position of the picture or the video displayed on the electronic whiteboard, and the coordinates can be the coordinates of a point at the upper left corner of the picture or the video, and can also be the coordinates of a central point; the size information of the display window of the picture or the video refers to the size of the display/play window of the picture or the video displayed in the electronic whiteboard.
In this embodiment, the nodes of the linked list may directly store the picture or the video in addition to the picture information or the video information of the picture, but compared with directly storing the picture/video, only the picture information or the video information is stored, so that the data amount of the linked list may be greatly saved, and the data amount of the linked list is prevented from being too large, thereby saving the processing resources of the linked list by the system, and only the picture information or the video information is stored.
403. Responding to a display instruction of a user to the electronic whiteboard file, and sequentially displaying each target object in the electronic whiteboard file on the electronic whiteboard according to the sequence and the position information of the target object displayed in the electronic whiteboard;
in this embodiment, each node of the linked list may further include location information of the target object displayed in the electronic whiteboard, where the location information may be coordinates of the target object displayed in the electronic whiteboard. Therefore, when the user needs to display the electronic whiteboard file obtained in step 402, the user inputs a display instruction for the electronic whiteboard file, and the electronic whiteboard responds to the display instruction, and sequentially displays each target object in the electronic whiteboard file on the electronic whiteboard according to the sequence of the plurality of target objects in the creation time and the position information of the target object displayed in the electronic whiteboard.
According to the position information of the target objects and the sequence of the target objects in the creation time, the position relations of the target objects can be completely restored when the electronic whiteboard file is displayed, and the problem that the position relations of the target objects are changed after the electronic whiteboard file is restored is solved.
For example, as shown in fig. 5, in the electronic whiteboard 500, the target objects a and B are located in a positional relationship that the target object B is located on an upper layer of the target object a, the target object B blocks a part of the target object a, and the target object a is created prior to the target object B. And storing the target objects A and B by using a linked list, wherein the node comprises the position information of the target objects A and B. And after the storage, obtaining a corresponding electronic whiteboard file. According to the method of the embodiment, when the electronic whiteboard file is displayed, according to the position information of the target objects A and B and the sequence of the position information and the creation time of the target objects A and B, the target object A is displayed first, then the target object B is displayed, and the target object B is displayed on the upper layer of the target object A, so that the position relation of the target objects A and B is completely restored.
In this embodiment, when a plurality of target objects in the electronic whiteboard file include handwriting, each handwriting in the electronic whiteboard file is sequentially displayed on the electronic whiteboard according to the sequence of the plurality of target objects in the creation time and the position information of the target objects displayed in the electronic whiteboard; when the picture is included, when the picture is displayed, the picture called from the storage area indicated by the storage path of the picture is sequentially displayed on the electronic whiteboard according to the sequence of the plurality of target objects in the creation time and the position information of the target objects displayed in the electronic whiteboard; similarly, when the video is displayed, the video called from the storage area indicated by the storage path of the video is sequentially displayed on the electronic whiteboard according to the sequence of the plurality of target objects in the creation time and the position information of the target objects displayed in the electronic whiteboard, so that different target objects such as handwriting, pictures, videos and the like are displayed.
404. Modifying the target handwriting into n sub-handwriting in response to the editing operation of the user on the target handwriting displayed by the electronic whiteboard file;
in this embodiment, the target objects include handwriting, and when a plurality of target objects in the electronic whiteboard file are displayed, a user may edit the target handwriting, that is, the user inputs an editing operation on the target handwriting, where the editing operation is to divide the target handwriting into n sub-scripts, and the electronic whiteboard modifies the target handwriting into n sub-scripts in response to the editing operation, where n is a positive integer.
The editing operation input by the user may be to divide the target handwriting into two or more sub-handwriting, or to wipe the target handwriting to modify the target handwriting into one sub-handwriting.
405. Replacing the node where the target handwriting is located with n newly added nodes;
because the length of the linked list is not fixed, new nodes can be inserted into the linked list or original nodes can be deleted, therefore, after n sub-scripts are obtained by editing the target handwriting, the nodes where the target handwriting is located can be replaced by n newly added nodes in the linked list, and the n newly added nodes can be used for storing the n sub-scripts.
406. Sequentially storing each sub-handwriting in different newly added nodes to obtain an edited electronic whiteboard file;
the n newly added nodes can respectively store each sub-handwriting in the n sub-handwriting, so that the edited electronic whiteboard file is obtained. Because the node where the target handwriting is located is replaced by the n newly added nodes, the position relationship between the n newly added nodes and other original nodes is still not changed, and the sequence of the n sub-handwriting in the n newly added nodes and other target objects is not changed.
For example, as shown in fig. 6, assuming that the node 602 is the node where the target handwriting is located, the node 602 is replaced by n newly added nodes, and the positional relationships between the n newly added nodes and the other original nodes (node 601 and node 603) are still unchanged. Therefore, the sequence and the position relation between the n sub-scripts in the n newly added nodes and other target objects cannot be changed, so that the edited electronic whiteboard file can be restored better, and the sequence between the target objects is maintained.
In the embodiment, handwriting, pictures and videos in the target objects are stored in a linked list mode, so that the sequence of various target objects in the creation time can be kept, the sequence can be still maintained when a user edits again, and the position relation among the target objects is ensured not to change.
The above description is given on the method for saving the electronic whiteboard file in the embodiment of the present application, and referring to fig. 7, the electronic whiteboard in the embodiment of the present application is described below, where an embodiment of the electronic whiteboard in the embodiment of the present application includes:
a creating unit 701, configured to create, on the electronic whiteboard, a target object corresponding to a creation instruction every time a creation instruction of one target object is received, so as to obtain multiple target objects;
a storing unit 702, configured to sequentially store each target object in different nodes of a linked list according to a sequence of creation times of multiple target objects, so as to obtain an electronic whiteboard file;
each node of the linked list comprises a target object and a pointer, and the pointer points to the next target object determined according to the sequence.
In a preferred implementation manner of this embodiment, each node of the linked list further includes location information of a target object displayed in the electronic whiteboard;
the electronic whiteboard further includes:
the display unit 703 is configured to respond to a display instruction of the user on the electronic whiteboard file, and sequentially display each target object in the electronic whiteboard file on the electronic whiteboard according to the sequence and the position information of the target object displayed in the electronic whiteboard.
In a preferred embodiment of this embodiment, the target object includes handwriting;
the electronic whiteboard further includes:
the editing unit 704 is used for responding to the editing operation of a user on the target handwriting displayed by the electronic whiteboard file, and modifying the target handwriting into n sub-handwriting, wherein n is a positive integer;
a node replacing unit 705, configured to replace a node where the target handwriting is located with n newly added nodes;
the storing unit 702 is further configured to sequentially store each sub-handwriting in different newly added nodes, so as to obtain an edited electronic whiteboard file.
In a preferred implementation manner of this embodiment, the target object includes one or more of handwriting, a picture, and a video;
the storing unit 702 is specifically configured to sequentially store each handwriting in different nodes of the linked list according to a sequence of creation times of the multiple target objects, and/or sequentially store picture information of each picture in different nodes of the linked list, and/or sequentially store video information of each video in different nodes of the linked list;
the picture information comprises one or more items of storage paths of pictures, coordinates of the pictures and size information of display windows of the pictures;
the video information includes one or more items of storage path of the video, coordinates of the video, and size information of a display window of the video.
In a preferred embodiment of this embodiment, the display unit 703 is specifically configured to sequentially display each handwriting in the electronic whiteboard file on the electronic whiteboard according to the sequence and the position information of the target object displayed in the electronic whiteboard, and/or sequentially display the picture retrieved from the storage area indicated by the storage path of the picture on the electronic whiteboard, and/or sequentially display the video retrieved from the storage area indicated by the storage path of the video on the electronic whiteboard.
In this embodiment, operations performed by each unit in the electronic whiteboard are similar to those described in the embodiment shown in fig. 2 and fig. 4, and are not described again here.
In this embodiment, a chain storage structure of a linked list is used to store a plurality of target objects, and the target objects have a precedence order in creation time, so that the storage unit 702 stores each target object in different nodes in sequence according to the precedence order, and a pointer of each node points to a next target object determined according to the precedence order, so as to connect the target objects according to the precedence order of their creation time, and each target object can be displayed according to the precedence order when displaying an electronic whiteboard file, thereby avoiding confusion of the position relationship of the target objects.
Referring to fig. 8, an electronic whiteboard in an embodiment of the present application is described below, where an embodiment of the electronic whiteboard in the embodiment of the present application includes:
the electronic whiteboard 800 may include one or more Central Processing Units (CPUs) 801 and a memory 805, where one or more applications or data are stored in the memory 805.
The central processing unit 801 may perform the operations performed by the electronic whiteboard in the embodiments shown in fig. 2 and fig. 4, which are not described herein again.
An embodiment of the present application further provides a computer storage medium, where one embodiment includes: the computer storage medium has stored therein instructions that, when executed on a computer, cause the computer to perform the operations performed by the electronic whiteboard in the embodiments illustrated in fig. 2 and 4.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.
Claims (10)
1. An electronic whiteboard file saving method is characterized by comprising the following steps:
when a creation instruction of one target object is received, creating the target object corresponding to the creation instruction on the electronic whiteboard to obtain a plurality of target objects;
sequentially storing each target object in different nodes of a linked list according to the sequence of the creation time of the target objects to obtain an electronic whiteboard file;
each node of the linked list comprises a target object and a pointer, and the pointer points to the next target object determined according to the sequence.
2. The electronic whiteboard file saving method according to claim 1, wherein each node of the linked list further includes location information of a target object displayed in the electronic whiteboard;
after the electronic whiteboard file is obtained, the method further includes:
and responding to a display instruction of the user to the electronic whiteboard file, and sequentially displaying each target object in the electronic whiteboard file on the electronic whiteboard according to the sequence and the position information of the target object displayed in the electronic whiteboard.
3. The electronic whiteboard file saving method according to claim 2, wherein the target object includes handwriting;
after each target object in the electronic whiteboard file is sequentially displayed on the electronic whiteboard, the method further includes:
responding to the editing operation of the user on the target handwriting displayed by the electronic whiteboard file, and modifying the target handwriting into n sub-handwriting, wherein n is a positive integer;
replacing the node where the target handwriting is located with n newly added nodes;
and sequentially storing each sub-handwriting in different newly added nodes to obtain the edited electronic whiteboard file.
4. The electronic whiteboard file saving method as claimed in claim 2, wherein the target object comprises one or more of handwriting, a picture and a video;
the sequentially saving each target object in different nodes of a linked list comprises:
sequentially storing each handwriting in different nodes of a linked list according to the sequence of the creation time of the target objects, and/or sequentially storing the picture information of each picture in different nodes of the linked list, and/or sequentially storing the video information of each video in different nodes of the linked list;
the picture information comprises one or more items of storage paths of pictures, coordinates of the pictures and size information of display windows of the pictures;
the video information comprises one or more items of storage path of the video, coordinates of the video and size information of a display window of the video.
5. The electronic whiteboard file saving method according to claim 4, wherein sequentially displaying each target object in the electronic whiteboard file on the electronic whiteboard according to the sequence and the position information of the target object displayed in the electronic whiteboard comprises:
sequentially displaying each handwriting in the electronic whiteboard file on the electronic whiteboard according to the sequence and the position information of the target object displayed in the electronic whiteboard, and/or,
the pictures called from the storage area indicated by the storage path of the pictures are displayed on the electronic whiteboard in sequence, and/or,
and sequentially displaying the videos called from the storage areas indicated by the storage paths of the videos on the electronic whiteboard.
6. An electronic whiteboard, comprising:
the system comprises a creating unit, a processing unit and a processing unit, wherein the creating unit is used for creating a target object corresponding to a creating instruction on an electronic whiteboard to obtain a plurality of target objects when the creating instruction of one target object is received;
the storage unit is used for sequentially storing each target object in different nodes of a linked list according to the sequence of the creation time of the target objects to obtain an electronic whiteboard file;
each node of the linked list comprises a target object and a pointer, and the pointer points to the next target object determined according to the sequence.
7. The electronic whiteboard of claim 6, wherein each node of the linked list further comprises location information of a target object displayed in the electronic whiteboard;
the electronic whiteboard further includes:
and the display unit is used for responding to a display instruction of the user on the electronic whiteboard file, and sequentially displaying each target object in the electronic whiteboard file on the electronic whiteboard according to the sequence and the position information of the target object displayed in the electronic whiteboard.
8. The electronic whiteboard of claim 7, wherein the target object comprises handwriting;
the electronic whiteboard further includes:
the editing unit is used for responding to the editing operation of the user on the target handwriting displayed by the electronic whiteboard file and modifying the target handwriting into n sub-handwriting, wherein n is a positive integer;
the node replacing unit is used for replacing the node where the target handwriting is located with n newly-added nodes;
and the storage unit is further used for sequentially storing each sub-handwriting in different newly-added nodes to obtain the edited electronic whiteboard file.
9. The electronic whiteboard of claim 7, wherein the target object comprises one or more of handwriting, a picture, and a video;
the storage unit is specifically configured to sequentially store each handwriting in different nodes of the linked list according to the sequence of the creation time of the plurality of target objects, and/or sequentially store the picture information of each picture in different nodes of the linked list, and/or sequentially store the video information of each video in different nodes of the linked list;
the picture information comprises one or more items of storage paths of pictures, coordinates of the pictures and size information of display windows of the pictures;
the video information comprises one or more items of storage path of the video, coordinates of the video and size information of a display window of the video.
10. The electronic whiteboard of claim 9, wherein the display unit is specifically configured to sequentially display each handwriting in the electronic whiteboard file on the electronic whiteboard according to the sequence and the position information of the target object displayed in the electronic whiteboard, and/or sequentially display the image retrieved from the storage area indicated by the storage path of the image on the electronic whiteboard, and/or sequentially display the video retrieved from the storage area indicated by the storage path of the video on the electronic whiteboard.
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| CN202010952846.0A CN112100140A (en) | 2020-09-11 | 2020-09-11 | Electronic whiteboard file saving method, electronic whiteboard and computer storage medium |
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