CN108460061A - A kind of Method of Loading Digital Map and electronic map terminal - Google Patents
A kind of Method of Loading Digital Map and electronic map terminal Download PDFInfo
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- CN108460061A CN108460061A CN201710097429.0A CN201710097429A CN108460061A CN 108460061 A CN108460061 A CN 108460061A CN 201710097429 A CN201710097429 A CN 201710097429A CN 108460061 A CN108460061 A CN 108460061A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
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Abstract
The present invention relates to a kind of Method of Loading Digital Map and electronic map terminal, wherein this method includes：Determine the screen border for the terminal for showing electronic map；The range of the screen overlay electronic figure for the terminal for showing electronic map is obtained according to the screen border；Covering is added in the range of the overlay electronic figure and is shown.The present invention shows the terminal screen size of electronic map by acquisition and determines the range for the terminal screen overlay electronic figure for showing electronic map, the only covering in load visual range, the covering of longitude and latitude except visual range directly filters, it can solve map and load inefficiency caused by a large amount of coverings, the problem of interim card, loading velocity is optimized, the user experience is improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an electronic map loading method and an electronic map terminal.
Background
This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present invention, and is believed to provide the reader with useful background information to facilitate a better understanding of the various aspects of the present invention. Accordingly, it should be understood that the description in this section is for purposes of illustration and is not an admission of prior art.
Electronic maps, also known as digital maps, are maps that are stored and searched digitally using computer technology. By utilizing the data processing capacity of the computer, the electronic map can realize faster position information search, and is convenient for users to use.
Data organization is one of the cores of electronic maps. The reasonable data organization can ensure that the navigation electronic map has comprehensive data, clear relationship and small data redundancy. The software is compiled based on reasonable electronic map data organization, the speed is high, the precision is high, and humanized works can be easily developed. The characteristics of real-time performance and the like of the navigation electronic map require that the data organization is mainly characterized in that: simple and clear topological relation.
The existing map data loading technology has some disadvantages, because the memory capacity of the existing map terminal is very limited, and a large amount of map data cannot be stored in the memory, the map data loaded last time needs to be completely deleted in each map operation through a spatial index and grid technology, and then all the map data required by the operation is loaded, so that a large number of same element objects are loaded and deleted repeatedly in the deleting and loading processes, and the loading efficiency of the map data is influenced.
When a large amount of data needs to be loaded, the server side generates plotting information layers slowly, time consumption is high, when the client side continuously moves the position of a map, the client side can continuously request services from the server side, the client side can generate a white screen phenomenon at the moment, the map can be generated after a while, all icons are loaded when a large amount of coverage objects are loaded on the traditional map, particularly, the calculated amount is large when the map moves, the algorithm is relatively complex, and the plotting efficiency is poor.
Therefore, how to increase the data loading magnitude and loading efficiency of the electronic map and improve the waiting time of the client is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The technical problem to be solved is how to provide an electronic map loading method and an electronic map terminal.
Aiming at the defects in the prior art, the invention provides an electronic map loading method and an electronic map terminal, which can quickly load a map covering.
In a first aspect, the present invention provides an electronic map loading method, including:
determining a screen boundary of a terminal displaying an electronic map;
acquiring the range of a screen coverage electronic map of a terminal for displaying the electronic map according to the screen boundary;
and adding a covering object in the range of the covering electronic graph and displaying.
Optionally, the determining a screen boundary of a terminal displaying the electronic map includes:
and acquiring the width or height of a screen of a terminal for displaying the electronic map.
Optionally, the obtaining, according to the screen boundary, a range of a screen coverage electronic map of a terminal displaying the electronic map includes:
acquiring longitude and latitude of a first corner of a terminal for displaying an electronic map;
acquiring the longitude and latitude of a second corner of a terminal for displaying the electronic map;
determining the range of the terminal screen for displaying the electronic map to cover the electronic map according to the screen boundary, the longitude and latitude of the second corner and the longitude and latitude of the first corner; wherein,
the first and second corners are diagonal.
Optionally, the method further comprises:
acquiring a central point coordinate of a currently displayed electronic map;
judging whether the coordinate of the central point of the electronic map of the current display device changes;
if so, the map is reloaded.
In another aspect, the present invention further provides an electronic map terminal, including:
a screen boundary determining unit for determining a screen boundary of a terminal displaying an electronic map;
the coverage area determining unit is used for acquiring the range of the screen coverage electronic map of the terminal for displaying the electronic map according to the screen boundary;
and the map loading unit is used for adding and displaying a covering object in the range of the covering electronic map.
Optionally, the screen boundary determining unit includes:
and the screen size acquisition unit is used for acquiring the screen width or height of the terminal for displaying the electronic map.
Optionally, the coverage determining unit includes:
the electronic map display device comprises a longitude and latitude acquisition unit, a display unit and a display unit, wherein the longitude and latitude acquisition unit is used for acquiring the longitude and latitude of a first corner and the longitude and latitude of a second corner of a terminal for displaying an electronic map, and the first corner and the second corner are opposite angles;
and the coverage positioning unit is used for determining the range of the terminal screen for displaying the electronic map to cover the electronic map according to the screen boundary, the longitude and latitude of the second corner and the longitude and latitude of the first corner.
Optionally, the method further comprises:
the neutral point coordinate acquisition unit is used for acquiring the coordinate of the central point of the currently displayed electronic map;
the map determining unit is used for judging whether the coordinate of the central point of the electronic map of the current display device changes; if so, the map is reloaded.
According to the technical scheme, the electronic map loading method and the electronic map terminal provided by the invention have the advantages that the size of the terminal screen for displaying the electronic map is obtained, the range of the terminal screen for displaying the electronic map for covering the electronic map is determined, only the covering objects in the visual range are loaded, and the covering objects with the longitude and latitude outside the visual range are directly filtered, so that the problems of low efficiency and blockage caused by loading a large number of covering objects on the map can be solved, the loading speed is optimized, and the user experience is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating an electronic map loading method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a flow chart of acquiring a screen width or a height of a terminal displaying an electronic map according to the embodiment of the invention shown in FIG. 1;
FIG. 3 is a schematic view illustrating a range flow of acquiring a screen coverage electronic map of a terminal displaying an electronic map according to the embodiment of the present invention shown in FIG. 1;
FIG. 4 and FIG. 5 are schematic diagrams illustrating a process of obtaining longitude and latitude coordinates of a corner of a screen according to the embodiment of the invention shown in FIG. 1;
FIG. 6 is a schematic diagram illustrating the acquisition of coordinates for the covering in the embodiment of FIG. 1 according to the present invention;
FIG. 7 is a flowchart illustrating a range of determining whether a covering covers the electronic map on the screen according to the embodiment of the invention shown in FIG. 1;
FIG. 8 and FIG. 9 are schematic flow charts illustrating the process of obtaining the coordinates of the center point according to the embodiment of the invention shown in FIG. 1;
FIG. 10 is a schematic flow chart illustrating reloading of the overlay after moving the map according to the embodiment of the invention shown in FIG. 1;
fig. 11 is a schematic structural diagram of an electronic map terminal in one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides an electronic map loading method, including: determining a screen boundary of a terminal displaying an electronic map; acquiring the range of a screen coverage electronic map of a terminal for displaying the electronic map according to the screen boundary; and adding a covering object in the range of the covering electronic graph and displaying. The following provides a detailed description of the present invention and the provided electronic map loading method.
First, determining a screen boundary of a terminal displaying an electronic map is described.
The determining of the screen boundary of the terminal displaying the electronic map comprises: and acquiring the width or height of a screen of a terminal for displaying the electronic map. As shown in FIG. 2, in the present invention, DisplayMetrics is obtained by using the android sdk method, where width of the class is the screen width, and height pixels is the screen height. The boundaries of the screen can be determined by the width and height of the screen.
Secondly, the range of the screen coverage electronic map of the terminal for displaying the electronic map according to the screen boundary is obtained.
Specifically, as shown in fig. 3, in the present invention, acquiring a range of a screen coverage electronic map of a terminal displaying the electronic map according to the screen boundary includes: acquiring longitude and latitude of a first corner of a terminal for displaying an electronic map; acquiring the longitude and latitude of a second corner of a terminal for displaying the electronic map; determining the range of the terminal screen for displaying the electronic map to cover the electronic map according to the screen boundary, the longitude and latitude of the second corner and the longitude and latitude of the first corner; wherein the first and second corners are diagonal.
For example: as shown in fig. 4, the coordinate of the upper left corner of the screen is (0,0), the map and the coordinate on the screen have a mapping relationship, i.e. project, and the fromScreenLocation method of project is called to convert the screen coordinate into the map longitude and latitude coordinate according to the mapping relationship. As shown in fig. 5, the same can be done to obtain the longitude and latitude of the lower right corner of the screen. It should be understood that the present invention is not limited thereto, and the latitude and longitude of two opposite angles of the upper right corner and the lower left corner can be obtained.
As shown in fig. 6, each overlay (a in the figure) has a latitude and longitude coordinate, and the coordinate only needs to satisfy the corresponding condition that the point is within the screen. Specifically, as shown in fig. 7, for example, whether the latitude of the point is greater than the latitude of the lower right corner point and less than the latitude of the upper left corner, and whether the longitude of the point is greater than the longitude of the upper left corner and less than the longitude of the lower right corner, is responsible for locating the current point within the screen. And if the current point is in the screen range, loading and displaying the covering corresponding to the current point, otherwise, not loading.
In the present invention, the method further comprises: acquiring a central point coordinate of a currently displayed electronic map; judging whether the coordinate of the central point of the electronic map of the current display device changes; if so, the map is reloaded. If the user drags the map during use, the loaded overlays in the electronic map need to be further recalculated and loaded. Specifically, the coordinates of the central point of the electronic map of the current display device are detected in real time. For example, as shown in fig. 8 and 9, after the map is loaded, the onMapStatusChangeFinish method is called back, and the parameter status includes the latitude and longitude coordinate information of the center point.
As shown in fig. 10, when the map moves, the onMapStatusChangeFinish method, which is sdk provided by the existing map, is called back, and then the above steps are repeated to reload the overlay covering the range of the electronic map on the terminal screen currently displaying the electronic map.
In order to further embody the superiority of the electronic map loading method provided by the present invention, the present invention provides an electronic map terminal applying the electronic map loading method, as shown in fig. 11, the electronic map terminal includes: a screen boundary determining unit for determining a screen boundary of a terminal displaying an electronic map; the coverage area determining unit is used for acquiring the range of the screen coverage electronic map of the terminal for displaying the electronic map according to the screen boundary; and the map loading unit is used for adding and displaying a covering object in the range of the covering electronic map. The following provides a detailed description of the present invention and the provided electronic map terminal. The working process of the electronic map terminal provided by the invention is similar to the flow of the electronic map loading method, and the electronic map loading method provided by the invention can be referred to, and is not repeated any more.
In the present invention, the screen boundary determining unit includes: and the screen size acquisition unit is used for acquiring the screen width or height of the terminal for displaying the electronic map. Specifically, as shown in fig. 2, in the present invention, DisplayMetrics is obtained by using the android sdk method, where width of the class is screen width and height of the class is screen height. The boundaries of the screen can be determined by the width and height of the screen.
In the present invention, the coverage determining unit includes: the electronic map display device comprises a longitude and latitude acquisition unit, a display unit and a display unit, wherein the longitude and latitude acquisition unit is used for acquiring the longitude and latitude of a first corner and the longitude and latitude of a second corner of a terminal for displaying an electronic map, and the first corner and the second corner are opposite angles; and the coverage positioning unit is used for determining the range of the terminal screen for displaying the electronic map to cover the electronic map according to the screen boundary, the longitude and latitude of the second corner and the longitude and latitude of the first corner. Specifically, as shown in fig. 3, in the present invention, acquiring a range of a screen coverage electronic map of a terminal displaying the electronic map according to the screen boundary includes: acquiring longitude and latitude of a first corner of a terminal for displaying an electronic map; acquiring the longitude and latitude of a second corner of a terminal for displaying the electronic map; determining the range of the terminal screen for displaying the electronic map to cover the electronic map according to the screen boundary, the longitude and latitude of the second corner and the longitude and latitude of the first corner; wherein the first and second corners are diagonal.
For example: as shown in fig. 4, the coordinate of the upper left corner of the screen is (0,0), the map and the coordinate on the screen have a mapping relationship, i.e. project, and the fromScreenLocation method of project is called to convert the screen coordinate into the map longitude and latitude coordinate according to the mapping relationship. As shown in fig. 5, the same can be done to obtain the longitude and latitude of the lower right corner of the screen. It should be understood that the present invention is not limited thereto, and the latitude and longitude of two opposite angles of the upper right corner and the lower left corner can be obtained.
As shown in fig. 6, each overlay (a in the figure) has a latitude and longitude coordinate, and the coordinate only needs to satisfy the corresponding condition that the point is within the screen. Specifically, as shown in fig. 7, for example, whether the latitude of the point is greater than the latitude of the lower right corner point and less than the latitude of the upper left corner, and whether the longitude of the point is greater than the longitude of the upper left corner and less than the longitude of the lower right corner, is responsible for locating the current point within the screen. And if the current point is in the screen range, loading and displaying the covering corresponding to the current point, otherwise, not loading.
In the present invention, the electronic map terminal further includes: the neutral point coordinate acquisition unit is used for acquiring the coordinate of the central point of the currently displayed electronic map; the map determining unit is used for judging whether the coordinate of the central point of the electronic map of the current display device changes; if so, the map is reloaded. Specifically, the coordinates of the central point of the electronic map of the current display device are detected in real time. For example, as shown in fig. 8 and 9, after the map is loaded, the onMapStatusChangeFinish method is called back, and the parameter status includes the latitude and longitude coordinate information of the center point. As shown in fig. 10, when the map moves, the onMapStatusChangeFinish method, which is sdk provided by the existing map, is called back, and then the above steps are repeated to reload the overlay covering the range of the electronic map on the terminal screen currently displaying the electronic map.
In summary, according to the electronic map loading method and the electronic map terminal provided by the invention, the size of the terminal screen displaying the electronic map is obtained, the range of the terminal screen displaying the electronic map covering the electronic map is determined, only the covering objects in the visual range are loaded, and the covering objects with the longitude and latitude outside the visual range are directly filtered, so that the problems of low efficiency and unsmooth loading caused by loading a large number of covering objects on the map can be solved, the loading speed is optimized, and the user experience is improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. 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.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention is not limited to any single aspect, nor is it limited to any single embodiment, nor is it limited to any combination and/or permutation of these aspects and/or embodiments. Moreover, each aspect and/or embodiment of the present invention may be utilized alone or in combination with one or more other aspects and/or embodiments thereof.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1. An electronic map loading method is characterized by comprising the following steps:
determining a screen boundary of a terminal displaying an electronic map;
acquiring the range of a screen coverage electronic map of a terminal for displaying the electronic map according to the screen boundary;
and adding a covering object in the range of the covering electronic graph and displaying.
2. The electronic map loading method according to claim 1, wherein the determining of the screen boundary of the terminal displaying the electronic map comprises:
and acquiring the width or height of a screen of a terminal for displaying the electronic map.
3. The electronic map loading method according to claim 1, wherein the acquiring a range of a screen coverage electronic map of a terminal displaying the electronic map according to the screen boundary comprises:
acquiring longitude and latitude of a first corner of a terminal for displaying an electronic map;
acquiring the longitude and latitude of a second corner of a terminal for displaying the electronic map;
determining the range of the terminal screen for displaying the electronic map to cover the electronic map according to the screen boundary, the longitude and latitude of the second corner and the longitude and latitude of the first corner; wherein,
the first and second corners are diagonal.
4. The electronic map loading method according to claim 1, further comprising:
acquiring a central point coordinate of a currently displayed electronic map;
judging whether the coordinate of the central point of the electronic map of the current display device changes;
if so, the map is reloaded.
5. An electronic map terminal, comprising:
a screen boundary determining unit for determining a screen boundary of a terminal displaying an electronic map;
the coverage area determining unit is used for acquiring the range of the screen coverage electronic map of the terminal for displaying the electronic map according to the screen boundary;
and the map loading unit is used for adding and displaying a covering object in the range of the covering electronic map.
6. The electronic map loading method according to claim 5, wherein the screen boundary determining unit includes:
and the screen size acquisition unit is used for acquiring the screen width or height of the terminal for displaying the electronic map.
7. The electronic map loading method according to claim 5, wherein the coverage determination unit includes:
the electronic map display device comprises a longitude and latitude acquisition unit, a display unit and a display unit, wherein the longitude and latitude acquisition unit is used for acquiring the longitude and latitude of a first corner and the longitude and latitude of a second corner of a terminal for displaying an electronic map, and the first corner and the second corner are opposite angles;
and the coverage positioning unit is used for determining the range of the terminal screen for displaying the electronic map to cover the electronic map according to the screen boundary, the longitude and latitude of the second corner and the longitude and latitude of the first corner.
8. The electronic map loading method according to claim 5, further comprising:
the neutral point coordinate acquisition unit is used for acquiring the coordinate of the central point of the currently displayed electronic map;
the map determining unit is used for judging whether the coordinate of the central point of the electronic map of the current display device changes; if so, the map is reloaded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710097429.0A CN108460061A (en) | 2017-02-22 | 2017-02-22 | A kind of Method of Loading Digital Map and electronic map terminal |
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| CN201710097429.0A CN108460061A (en) | 2017-02-22 | 2017-02-22 | A kind of Method of Loading Digital Map and electronic map terminal |
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| CN201710097429.0A Pending CN108460061A (en) | 2017-02-22 | 2017-02-22 | A kind of Method of Loading Digital Map and electronic map terminal |
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| CN111858795A (en) * | 2020-06-16 | 2020-10-30 | 北京金茂绿建科技有限公司 | Map loading processing method and device |
| CN113769402A (en) * | 2021-09-16 | 2021-12-10 | 厦门极致互动网络技术股份有限公司 | Method for updating visible region of geodetic map in frames |
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| CN113769402A (en) * | 2021-09-16 | 2021-12-10 | 厦门极致互动网络技术股份有限公司 | Method for updating visible region of geodetic map in frames |
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