CN111414104A

CN111414104A - Electronic map local display method and device

Info

Publication number: CN111414104A
Application number: CN201910011077.1A
Authority: CN
Inventors: 王海鹏; 王前卫
Original assignee: Alibaba Group Holding Ltd
Current assignee: Alibaba Group Holding Ltd
Priority date: 2019-01-07
Filing date: 2019-01-07
Publication date: 2020-07-14
Anticipated expiration: 2039-01-07
Also published as: CN111414104B

Abstract

The invention discloses a local display method and a local display device for an electronic map, wherein the method comprises the following steps: acquiring a local display area selected by a user in a global map of an electronic map; setting a local scale corresponding to the local display area, wherein the local scale is larger than a global scale of the global map; acquiring map data of a geographic area corresponding to the local display area from a terminal local or a server according to the local display area and the local scale; and displaying the local display area on the global map in an overlapping manner, and displaying the map data in the local display area. The invention realizes the display effect of simultaneously displaying the global picture and the local picture of the electronic map on the same display picture, and leads the map query operation to be more convenient and faster.

Description

Electronic map local display method and device

Technical Field

The invention relates to a local display method and device of an electronic map, and belongs to the technical field of electronic maps.

Background

The existing electronic map usually adopts a hierarchical display mode, each level represents different scales, data with different granularities are displayed, and different information is displayed. For example, under a small scale, overview information, such as road trends, can be viewed; under a large scale, detailed information of a specific point, such as the position of a certain building, can be checked.

The existing electronic map has the defects that the existing electronic map can only display a map picture of one level at a certain time, and at the moment, a user can only acquire information displayed by the level. If the local detail information is to be checked, the map picture can be enlarged as a whole; if the global overview information is to be viewed, the map screen can only be entirely reduced, and the global screen and the local screen cannot be simultaneously displayed on the same display screen. This results in the inability to view both local detail information and its topological association with the surrounding scene in the global context.

For example, when it is required to inquire how to reach the entrance of the park, if the park is viewed in the global mode with a small scale, only the floor area of the park can be seen, but the position of the entrance and the road in the park cannot be seen, and if the park is viewed in the local mode with a large scale, only the specific details of a certain entrance and the connection relation between the entrance and other roads in the park cannot be seen. Therefore, the user can only switch between the global mode and the local mode by zooming in and zooming out, and the information seen in the two modes is temporarily memorized and associated with each other in the mind to obtain the information required by the user, so that the user cannot observe the map information intuitively.

Disclosure of Invention

In view of the technical defects and technical drawbacks in the prior art, embodiments of the present invention provide a method and an apparatus for displaying a local part of an electronic map, so as to simultaneously display a global picture and a local picture of the electronic map on a same display screen.

One aspect of the present invention provides a method for locally displaying an electronic map, including:

acquiring a local display area selected by a user in a global map of an electronic map;

setting a local scale corresponding to the local display area, wherein the local scale is larger than a global scale of the global map;

acquiring map data of a geographic area corresponding to the local display area from a terminal local or a server according to the local display area and the local scale;

and displaying the local display area on the global map in an overlapping manner, and displaying the map data in the local display area.

Another aspect of the present invention provides an electronic map partial display apparatus, including:

the area acquisition module is used for acquiring a local display area selected by a user from a global map of the electronic map;

the scale setting module is used for setting a local scale corresponding to the local display area, and the local scale is larger than the global scale of the global image;

the data acquisition module is used for acquiring map data of a geographic area corresponding to the local display area from a terminal local or a server side according to the local display area and the local scale;

and the superposition display module is used for superposing and displaying the local display area on the global map and displaying the map data in the local display area.

Yet another aspect of the present invention provides a computer readable storage medium having a computer program stored thereon, wherein the program is to implement the above method when executed by a processor.

Yet another aspect of the invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the method according to any one of claims 1 to 5.

This embodiment has realized: in the electronic map picture displayed by the user terminal, the global picture is displayed, meanwhile, the local display area selected by the user is displayed in an overlapping mode, the map data with the scale larger than that of the global picture is displayed in the local display area, and more detailed geographic information corresponding to the concerned local geographic position can be displayed for the user. According to the scheme, more detailed map data of the corresponding geographic position under a large scale are separately acquired aiming at the local display area, and image elements in the global picture display image are not simply amplified. Therefore, the scheme can simultaneously display the display effect of the global picture of the electronic map with the small scale and the local picture with the large scale on the same display screen. The user can obtain the topological correlation information of the focus point and the surrounding scenery in the global map and can also obtain the local detail information of the focus point in the local map, so that the map query operation is more convenient and faster.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a flowchart of a local display method of an electronic map according to embodiment 1 of the present invention;

fig. 2 is a schematic flowchart of a process of starting in a touch manner in embodiment 1 of the present invention;

fig. 3 is a flowchart of a local display method of an electronic map according to embodiment 2 of the present invention;

FIG. 4 is a schematic view of a combination of embodiments 2 of the present invention;

fig. 5 is a schematic structural diagram of a local display device of an electronic map according to embodiment 3 of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

< example 1>

Fig. 1 is a partial display method of an electronic map according to embodiment 1 of the present invention, as shown in the figure, including the following steps:

and step 110, acquiring a local display area selected by a user in a global map of the electronic map.

The global map refers to the entire screen of the electronic map when the local display is not performed. The local display area is an area to be locally displayed, which is selected by a user of the electronic map in a global map of the electronic map.

Specifically, a map point input by the user in the global map may be acquired, and a local display area of a preset shape and size may be generated with the map point as a center. For example, the acquisition may be performed in a click manner. The point selection refers to the user selecting one map point in the global map, specifically, the user may press a certain point in the global map for a long time by a finger or a handwriting tool, or double-click a certain point in the global map by a mouse, thereby completing the point selection operation. Thereafter, the partial display area is determined according to a preset shape and size centering on the map point.

Wherein the preset shape and size can be set according to a predetermined display strategy. For example, if a building in the global map is selected, the user may be deemed to want to view the map content in local display regions that are 200 meters wide and long, respectively, centered on the building.

Specifically, an enclosed area input by the user in the global map of the electronic map may also be acquired as the local display area. For example, the acquisition may be performed in a round-robin manner. The circle selection refers to a user selecting a map range in the global map, and specifically, the user may select a closed region in the global map through a predetermined gesture operation or a mouse selection box.

And 120, setting a local scale corresponding to the local display area, wherein the local scale is larger than the global scale of the global map.

Wherein the global scale is a display scale used in the global map, and the local scale is a display scale used in the local display area. The local scale is larger than the global scale of the global map.

For example, the global scale is 1: 200, local scale 1: and 50, a general diagram is displayed in the global diagram, and a detail diagram is displayed in the local diagram. Specifically, according to a preset display strategy, a local scale can be set to be larger than a global scale, so that the purpose of enlarged display is achieved; the local scale can also be set to be smaller than the global scale, so that the purpose of reducing display is achieved.

Specifically, when a local scale is set, a global scale of the global map may be obtained, and the local scale is generated according to the global scale; alternatively, one or more local scales corresponding to the local display regions may be preset, and one local scale may be selected from the local display regions.

And step 130, obtaining map data of a geographic area corresponding to the local display area from a terminal local or a server according to the local display area and the local scale.

When the global map is displayed, map data of a geographic area corresponding to the global map is acquired according to the size, the shape and the coordinates of the displayed map surface and the global scale. Accordingly, when a partial map is to be displayed in a partial display area, map data having a partial scale corresponding to the partial display area is also acquired. Specifically, if the required map data is stored on the terminal, the map data may be acquired locally from the terminal; if the required map data is not stored on the terminal, the map data can be acquired from the server.

And 140, overlapping and displaying the local display area on the global map, and displaying the map data in the local display area.

For a specific implementation manner of displaying the map data in the local display area, reference may be made to relevant contents in the subsequent embodiments, which are not described herein again.

Thereafter, when the user selects a different partial display position, the above steps are repeated again until the user ends the action. For example, as shown in fig. 2, when the user starts the above steps in a finger touch manner, a local graph is created and displayed in the global graph; when the finger of the user drags on the screen, the displayed local graph is also updated and displayed along with the dragging position; when the finger of the user leaves the screen, the local graph is destroyed and the state of only displaying the global graph is restored.

< example 2>

Specifically, the implementation manner of displaying the map data in the local display area in the step 130 is described in this embodiment, and as shown in fig. 3, the implementation manner includes the following steps:

step 210, create a local frame buffer object and fill textures into the color buffer of the local frame buffer object.

The frame buffer is a storage space for storing rendering data processed or to be extracted by the video card chip. The Frame Buffer Object (FBO) includes a plurality of Frame buffers, such as: color buffers, depth buffers, stencil buffers, etc. Wherein, two kinds of data can be filled in the color buffer: one is texture data for copying rendering data thereto; the other is to buffer data for filling when the color buffer is not needed. The local frame buffer object is a frame buffer object used to generate the local graph.

Step 220, create an instance of the local graph and bind the local frame buffer object.

The instance refers to a logic organization structure of rendering content of the local graph to be generated, and the instance is bound with the local frame buffer object and then serves as a rendering target of the local graph. Alternatively, the example may be of various types, and different logical organization structures are set according to a preset display policy, so that the rendering effect can be adjusted more conveniently.

Step 230, loading corresponding local map content from the map data, and generating local rendering data according to the example.

The local map content refers to content to be displayed in a local map, and for example, in a local area having a length and a width of 200 meters with a certain building selected by a user as a center, a local hierarchy is 1: the 50-scale contains the contents of the basic road data and POI data. The local rendering data refers to data formed after the local map content is adapted according to a logical organization structure specified by a previously generated example, so that the rendering processing is performed by a display card chip.

Step 240, copying the local rendering data into the texture of the local frame buffer object to form a local graph.

Specifically, the color buffer in the local frame buffer object may be divided into two parts, namely a front buffer and a back buffer, the generated rendering data is sequentially stored in the back buffer, and after all the rendering data is completely stored in the back buffer, the data exchange (Swap) in the back buffer is exchanged into the cross buffer to complete the replication, thereby completing the generation of the local graph.

According to the method, when the local graph is generated, the frame buffer object which is displayed on the screen is not used, but the local frame buffer object which is specially used for generating the local graph is additionally used, so that the local graph can be displayed after being rendered, the rendering is not required to be performed while displaying, and the off-screen rendering is realized.

Step 250, placing the local graph at the local display area of the global graph to form a combined graph.

Specifically, when the combination is performed, the center of the partial map is made to coincide with the center of the partial display position selected by the user. For example, as shown in fig. 4, the electronic map displayed on the mobile phone is an electronic map, in which a square area is a global map and a circular area is a local map, and the two are combined to form a combined map.

Step 260, generating combined rendering data based on the combined graph.

Specifically, since the global graph already exists and is being displayed before the local graph is generated, and accordingly, both the global frame buffer object corresponding to the global graph and the instance of the global graph exist, the content of the above-mentioned combined graph may be adapted according to the logical organization structure of the instance of the global graph, so as to generate the combined rendering data.

Step 270, copying the combined rendering data to a global frame buffer object of the global graph.

Thereafter, by the time the next refresh time comes, the information in the global frame buffer object is displayed on the screen, thereby achieving the simultaneous display of the global map and the local map.

In general, the partial view displayed by the above method is generally rectangular. Optionally, in order to enrich the display effect, special effect rendering data may be added to the combined rendering data, so as to achieve a special display effect with a special shape, a frame, a fish-eye enlarging effect, and the like.

< example 3>

The present embodiment provides an electronic map local display device, which can implement the foregoing method, as shown in fig. 5, and includes: the system comprises an area acquisition module 11, a proportion setting module 12, a data acquisition module 13 and a superposition display module 14, and the working principle is as follows:

the area acquisition module 11 acquires a local display area selected by a user in a global map of the electronic map. Specifically, a map point input by the user in the global map may be obtained, and a local display area of a preset shape and size may be generated with the map point as a center; alternatively, a closed region input by the user in the global map of the electronic map may be acquired as the local display region.

Then, a scale setting module 12 sets a local scale corresponding to the local display area, where the local scale may be larger or smaller than a global scale of the global map; specifically, a global scale of the global map may be obtained, and the local scale is generated according to the global scale; or a local scale corresponding to one or more of the local display regions may be set in advance.

Then, the data obtaining module 13 obtains map data of a geographic area corresponding to the local display area from a terminal local or a server according to the local display area and the local scale, and the overlay display module 14 overlays and displays the local display area on the global map and displays the map data in the local display area. For a specific process of displaying map data, reference is made to the description of embodiment 2 above.

For specific description and examples in this embodiment, reference may be made to the related contents of the above method embodiments, which are not described herein again. As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A local display method of an electronic map is characterized by comprising the following steps:

setting a local scale corresponding to the local display area;

2. The method according to claim 1, wherein the obtaining of the local display area selected by the user in the global map of the electronic map comprises:

obtaining a map point input by the user in the global map, and generating a local display area with a preset shape and size by taking the map point as a center;

or,

and acquiring a closed area input by the user in the global map of the electronic map as the local display area.

3. The method according to claim 1, wherein the setting the local scale corresponding to the local display area comprises:

acquiring a global scale of the global map, and generating the local scale according to the global scale;

or,

and presetting a local scale corresponding to one or more local display areas.

4. The method of claim 1, wherein the displaying the map data in the local display area comprises:

creating a local frame buffer area object, and filling textures into a color buffer area of the local frame buffer area object;

creating an instance of the local graph and binding the local frame buffer object;

loading corresponding local map content from the map data, and generating local rendering data according to the example;

copying the local rendering data into the texture of the local frame buffer object to form a local graph;

placing the local graph at the local display area of the global graph to form a combined graph;

generating combined rendering data based on the combined graph;

copying the combined rendering data into a global frame buffer object of the global graph.

5. The method of claim 5, comprising: adding special effect rendering data in the combined rendering data.

6. An electronic map partial display device, comprising:

the scale setting module is used for setting a local scale corresponding to the local display area;

7. The apparatus of claim 6, wherein the region acquisition module is specifically configured to:

or,

8. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method of any one of claims 1 to 5.

9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1-5 when executing the program.