CN102739699B - Map display method under browser/server mode and client thereof - Google Patents
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Abstract
The invention discloses a map display method under a browser/server mode and a client thereof. The method used by the client to display the map under the browser/server mode comprises the following steps that: S1. The client downloads map vector data from a map server and carries out pretreatment on the map vector data so as to generate an electronic map file; S2. The client caches the electronic map file; S3. The client displays the electronic map file according to a preset map attribute; S4. The client receives user request information; S5. The client modifies the map attribute related to the display of the electronic map file according to the user request information; S6. The client displays the electronic map file according to the modified map attribute. By using the method and the client of the invention, all the electronic map data is downloaded once and processing is performed on the data. Through changing the map attribute, various kinds of operations performed by the user to the electronic map are realized. Small storage space is occupied and a reaction speed is fast.
Description
Technical field
The present invention relates to electronic map field, particularly relate to the map-indication method under a kind of Browser/Server Mode and client.
Background technology
Under C/S (Client/Server, client/server) pattern, MAPX assembly is a kind of control that map exploitation is commonly used.Use MAPX, most maps control overflow can be met, as map amplify, reduce, translation etc.But when utilizing MAPX to show electronic chart under C/S model, must install corresponding software in client, maintenance of works is more difficult, and be not easy to client upgrading.
Along with the rise of Internet technology, supplier changes C/S model or improves, and has developed B/S (Browser/Server, browser/server) pattern.In such a mode, user job interface is realized by WWW browser, few partial transaction logic is only had to realize at front end (Browser), major affairs logic realizes at server end (Server) mostly, form so-called three layers of (3-tier) structure, so just enormously simplify client computer load, alleviate cost and the workload of client maintenance and upgrading, reduce the overall cost (TCO) of user.But in prior art, also cannot by the webpage of MAPX component application under B/S pattern.
In prior art, webpage under B/S pattern to realize the stepless zooming of map, can map datum be stored on map server, when needed, again map datum is transferred to Java Applet (some applets of writing with Java language webpage from map server, when user accesses the webpage of Java support, Applet is downloaded to application end and performs corresponding multimedia function), out present to user by the JavaApplet real-time rendering on webpage.For this method, terminal use often drags map, and engine map just needs the map datum on Real time request server, then map datum is fetched, and implements map and play up, and therefore efficiency is quite low.
Based on problem above, in recent years occur method pictured for map vector data, by IE buffer memory map picture, solved local page and repeat to and map server asks map datum and the efficiency produced.But due to map vector data pictured after, can not accomplish the stepless zooming of map, under some has the monitor client of strict demand to map level of detail, this method is inapplicable.
Summary of the invention
The technical problem to be solved in the present invention is, for the defect that cannot realize efficient map zoom function in prior art under B/S pattern, provides a kind of map-indication method and the client that can realize efficient map zoom function under B/S pattern.
The technical solution adopted for the present invention to solve the technical problems is:
Map-indication method under a kind of Browser/Server Mode is provided, in client by browser display electronic chart, comprises the following steps:
S1, described client download map vector data from map server, and carry out preliminary treatment to generate electronic map file to described map vector data;
Electronic map file described in S2, described client-cache;
S3, described client show described electronic map file according to the map attribute preset;
S4, described client receive user request information;
The map attribute that S5, described client are relevant to the display of described electronic map file according to user request information amendment;
S6, described client show described electronic map file according to amended map attribute.
In map-indication method under a kind of Browser/Server Mode of the present invention, described user request information comprises the solicited message about the solicited message of enlarged map, the solicited message reducing map and translation map.
In map-indication method under a kind of Browser/Server Mode of the present invention, in step S3, also comprise described client map attribute according to amendment parameter modification.
In map-indication method under a kind of Browser/Server Mode of the present invention, described amendment parameter comprises this magnification ratio, this reduce in scale, this translation distance, maximum magnification ratio, maximum reduce in scale and maximal translation distance.
In map-indication method under a kind of Browser/Server Mode of the present invention, described amendment parameter inputs by factory default or by user.
Present invention also offers a kind of client, comprising:
Download module, for downloading map vector data from map server, and carries out preliminary treatment to described map vector data thus generates electronic map file;
Memory module, for receiving electronic map file from described download module, and electronic map file described in buffer memory, also for storing the data relevant to map attribute;
Display module, for reading electronic map file from described memory module, and shows described electronic map file according to the map attribute stored in described memory module;
Subscriber Interface Module SIM, inputs for the user received about user request information;
Attribute modification module, for receiving described user request information from described Subscriber Interface Module SIM, and according to described user request information amendment storage described map attribute in a storage module.
In a kind of client of the present invention, described user request information comprises the solicited message about the solicited message of enlarged map, the solicited message reducing map and translation map.
In a kind of client of the present invention, described attribute modification module is also for map attribute according to amendment parameter modification.
In a kind of client of the present invention, described amendment parameter comprises this magnification ratio, this reduce in scale, this translation distance, maximum magnification ratio, maximum reduce in scale and maximal translation distance.
In a kind of client of the present invention, described amendment parameter inputs by factory default or by user.
Map-indication method under a kind of Browser/Server Mode of the present invention and the beneficial effect of client are: all electronic map datas of disposable download also process it, the various operations of user to electronic chart are realized by changing map attribute, take less memory space, and reaction speed is fast.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of a kind of client according to the embodiment of the present invention;
Fig. 2 is the flow chart according to the map-indication method under a kind of Browser/Server Mode of the embodiment of the present invention;
Fig. 3 is the schematic diagram of the browser interface of a kind of client according to the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 is the structural representation of a kind of client according to the embodiment of the present invention.In the present embodiment, client comprises download module 110, memory module 120, display module 130, Subscriber Interface Module SIM 140 and attribute modification module 150.
Download module 110, for downloading map vector data from map server, and carries out preliminary treatment to described map vector data thus generates electronic map file.Electronic map file can be such as but not limited to grille picture or map vector file.Such as, after having downloaded map vector data, map reference can be converted to screen coordinate according to the Raster Data Model preset in shape library by download module 110, and carry out corresponding data transaction and data cutout, then adopt the methods of samplings such as indexing means and point of interest summary such as Grid Index to set up spatial index and modeling to data, thus generate the electronic map file of grille picture form.Again such as, after having downloaded map vector data, download module 110 can compress data and merge feature object, first carry out lossy compression method, delete unnecessary point, then Lossless Compression is carried out, be relative coordinate by Conversion of Spatial Data, to reduce the memory space of single coordinate points, and improve the treatment effeciency of processor, finally can carry out necessary union operation to feature object such as advanced road layer etc., to reduce the cycle-index when loading key element, loading efficiency is provided, next modeling is carried out according to the geometrical feature of feature object, such as point model (as point of interest), line model (as road), polygon model is (as river, park etc.), it is in fact exactly the design process of map vector file to the modeling process of these feature objects.In this example, whole map vector file can be divided into master file and multiple spatial index file, master file is responsible for recording the attribute information of feature object and geological information, and corresponding spatial index file is responsible for recording the offset address of feature object in master file and shared space size.In addition, also to carry out classification to map vector data, namely the division of display level is carried out according to the importance difference of feature object, in general, only grade classification is carried out to path layer and point of interest layer, such as path layer can be divided into 5 independent path layers according to the different brackets of road, point of interest layer be divided into 4 independent point of interest layers, the setting of map zoom level is convenient in such division, loaded and displayed process can be carried out in conjunction with displaying ratio chi, thus generate the electronic map file of map vector document form.
Memory module 120, for receiving electronic map file (such as but not limited to grille picture or map vector file etc.) from download module 110, and this electronic map file of buffer memory.Memory module 120 also for storing the data relevant to map attribute, such as but not limited to displaying ratio chi, map area scope etc.Memory module 120 can comprise any memory, such as the computer readable medium of storing driver, memory device and other types, such as hard disk, moveable magnetic disc, removable CD, flash card, DVD, RAM, read-only memory (ROM) etc.When using in this article, term " computer program medium " and " computer readable medium " typically refer to hard drive, moveable magnetic disc, removable CD (such as, read-only optical disc (CompactDisc Read-Only Memory, CDROM), DVD etc.), postcode disk, tape, magnetic storage apparatus, micro electronmechanical client memory (micro-electromechanical system, MEMS), based on the relevant hard disk of the memory device etc. of nanometer technology, and other media such as flash card, DVD, RAM equipment, ROM equipment etc.
Display module 130, for reading electronic map file from memory module 120, and shows this electronic map file according to the map attribute stored in memory module 120.Map attribute can comprise default map attribute and amended map attribute.In addition, map attribute can comprise displaying ratio chi, map area scope etc.Such as, displaying ratio chi can be associated with the feature object of display, and namely a kind of display level of pixel object at least corresponds to a kind of engineer's scale.Again such as, map area scope can comprise world wide, range of countries, upgrading scope etc., during a certain address of user search, and the electronic chart of display respective regions.When carrying out the loaded and displayed of electronic chart, relative index can also be carried out.Such as, first carry out one-level index, upgrading map file and secondary index file is indexed according to map sheet number, the external memory address of map datum in map vector file is obtained again by secondary index file, finally find map datum according to the external memory address in electronic map file, and carry out loaded and displayed.Display module 130 can comprise the electronic equipment that liquid crystal display, rear projection display, plasma display etc. have Presentation Function.
Subscriber Interface Module SIM 140, inputs for the user received about user request information, and sends this user input to attribute modification module 150.Subscriber Interface Module SIM 140 can comprise the input-output equipment of any appropriate, such as keyboard, touch-screen, touch pad, handwriting pad, mouse etc.
Attribute modification module 150, revises for the user request information received according to Subscriber Interface Module SIM 140 map attribute be stored in memory module 120, makes display module 130 ask to show electronic chart according to user.Such as, when user input shows the solicited message of amplification, attribute modification module 150 can change displaying ratio chi according to user request information, thus asks to amplify display electronic chart according to user.Again such as, when user input shows the solicited message of translation, attribute modification module 150 can change display centre position according to user request information, thus according to the electronic chart that user asks translation to show.In addition, attribute modification module 150 can also be used for according to amendment parameter modification map attribute.Amendment parameter can comprise this magnification ratio, this reduce in scale, this translation distance, maximum magnification ratio, maximum reduce in scale and maximal translation distance.Amendment parameter can input by factory default or by user.Such as, when this magnification ratio of factory default is 5 times, when namely this displaying ratio chi is 5 times of former displaying ratio chi, often receive once about the solicited message that map amplifies, displaying ratio chi can be revised as original 5 times by attribute modification module 150 automatically, until reach maximum magnification ratio.Again such as, the user request information of reception can comprise this magnification ratio, and such as, when the magnification ratio of user's input is 5 times, displaying ratio chi can be revised as original 5 times by attribute modification module 150, until reach maximum magnification ratio.When user request for map reduce or map translation time, can with reference to above-mentioned about map amplify example enforcement.
In the course of the work, download module 110 downloads map vector data from map server, and carries out preliminary treatment to described map vector data thus generate electronic map file.Electronic map file can be such as but not limited to grille picture or map vector file.Memory module 120 receives electronic map file (such as but not limited to grille picture or map vector file etc.) from download module 110, and this electronic map file of buffer memory.Display module 130 reads electronic map file from memory module 120, and shows this electronic map file according to the map attribute stored in memory module 120.Map attribute can comprise displaying ratio chi, map area scope etc.Such as, displaying ratio chi can be associated with the feature object of display, and namely a kind of display level of pixel object at least corresponds to a kind of engineer's scale.Again such as, map area scope can comprise world wide, range of countries, upgrading scope etc., during a certain address of user search, and the electronic chart of display respective regions.The user that Subscriber Interface Module SIM 140 receives about user request information inputs, and sends this user input to attribute modification module 150.The user request information that attribute modification module 150 receives according to Subscriber Interface Module SIM 140 and/or default amendment parameter modification are stored in the map attribute in memory module 120, make display module 130 according to user's request and/or amendment parameter display electronic chart.Such as, when user input shows the solicited message of amplification, attribute modification module 150 can, according to user request information and/or amendment parameter change displaying ratio chi, make display module 130 amplify display electronic chart according to user's request and/or amendment parameter.Again such as, when user input shows the solicited message of translation, attribute modification module 150 according to user request information and/or amendment parameter change display centre position, can make the electronic chart that display module 130 shows according to user's request and/or amendment parameter translational.
Fig. 2 is the flow chart according to the map-indication method under a kind of Browser/Server Mode of the embodiment of the present invention.In the present embodiment, the method showing map by client as shown in Figure 1 under Browser/Server Mode starts from step S1.
In step sl, client downloads map vector data from map server, and carries out preliminary treatment to this map vector data thus generate electronic map file.Electronic map file can be such as but not limited to grille picture or map vector file.Such as, after having downloaded map vector data, according to the Raster Data Model preset in shape library, map reference can be converted to screen coordinate, and carry out corresponding data transaction and data cutout, then adopt the methods of samplings such as indexing means and point of interest summary such as Grid Index to set up spatial index and modeling to data, thus generate the electronic map file of grille picture form.Again such as, after having downloaded map vector data, can compress data and feature object be merged, first carry out lossy compression method, delete unnecessary point, then Lossless Compression is carried out, be relative coordinate by Conversion of Spatial Data, to reduce the memory space of single coordinate points, and improve the treatment effeciency of processor, finally can carry out necessary union operation to feature object such as advanced road layer etc., to reduce the cycle-index when loading key element, loading efficiency is provided, next modeling is carried out according to the geometrical feature of feature object, such as point model (as point of interest), line model (as road), polygon model is (as river, park etc.), it is in fact exactly the design process of map vector file to the modeling process of these feature objects.In this example, whole map vector file can be divided into master file and multiple spatial index file, master file is responsible for recording the attribute information of feature object and geological information, and corresponding spatial index file is responsible for recording the offset address of feature object in master file and shared space size.In addition, also to carry out classification to map vector data, namely the division of display level is carried out according to the importance difference of feature object, in general, only grade classification is carried out to path layer and point of interest layer, such as path layer can be divided into 5 independent path layers according to the different brackets of road, point of interest layer be divided into 4 independent point of interest layers, the setting of map zoom level is convenient in such division, loaded and displayed process can be carried out in conjunction with displaying ratio chi, thus generate the electronic map file of map vector document form.
In step s 2, the electronic map file of client-cache generation.As mentioned above, by these electronic map file with grille picture form or map vector document form buffer memory, relative original map data, the memory space that the electronic map file of these forms takies is less, disposable all electronic map datas can be downloaded and buffer memory, avoids user carrying out amplifying, the operation such as translation time the response delay that causes of downloading data again.
In step s3, client is according to the electronic map file of the map attribute display storage preset.These map attributes are relevant to the display of electronic map file.Map attribute can comprise displaying ratio chi, map area scope etc.Such as, displaying ratio chi can be associated with the feature object of display, and namely a kind of display level of pixel object at least corresponds to a kind of engineer's scale.Again such as, map area scope can comprise world wide, range of countries, upgrading scope etc., during a certain address of user search, and the electronic chart of display respective regions.When carrying out the loaded and displayed of electronic chart, relative index can also be carried out.Such as, first carry out one-level index, upgrading map file and secondary index file is indexed according to map sheet number, the external memory address of map datum in map vector file is obtained again by secondary index file, finally find map datum according to the external memory address in electronic map file, and carry out loaded and displayed.
In step s 4 which, client receives user request information.User request information can comprise map and amplify request, map zoom-out request, map translation request etc.In addition, map amplification request can also comprise multiplication factor request.
In step s 5, the map attribute that client is relevant to the display of electronic map file according to user request information amendment.Such as, when user input shows the solicited message of amplification, displaying ratio chi can be changed according to user request information to ask to amplify display electronic chart according to user.Again such as, when user input shows the solicited message of translation, display centre position can be changed according to user request information so that the electronic chart of asking translation to show according to user.In addition, can also according to amendment parameter modification map attribute.Amendment parameter can comprise this magnification ratio, this reduce in scale, this translation distance, maximum magnification ratio, maximum reduce in scale and maximal translation distance.Amendment parameter can input by factory default or by user.Such as, when this magnification ratio of factory default is 5 times, when namely this displaying ratio chi is 5 times of former displaying ratio chi, often receive once about the solicited message that map amplifies, automatically displaying ratio chi can be revised as original 5 times, until reach maximum magnification ratio.Again such as, the user request information of reception can comprise this magnification ratio, such as, when the magnification ratio of user's input is 5 times, displaying ratio chi can be revised as original 5 times, until reach maximum magnification ratio.When user request for map reduce or map translation time, can with reference to above-mentioned about map amplify example enforcement.
In step s 6, client is according to amended map attribute display electronic map file.Concrete grammar has been described in detail in step s3.
The all electronic map datas of the disposable download of the present invention also process it, not only take less memory space, and do not need again from server downloading data when processing user operation, and reaction speed is fast.In addition, the various operations of user to electronic chart can be realized by changing map attribute, such as, amplify, reduce, translation etc.
Fig. 3 is the schematic diagram of the browser interface of a kind of client according to the embodiment of the present invention.In the present embodiment, provide a kind of ActiveX control, in this ActiveX control, MAPX assembly is packed.When user carries out operation requests to this ActiveX control, be converted into the request to MAPX assembly automatically by ActiveX control, and MAPX assembly is according to the request content of user, makes corresponding reaction, as map amplified, reducing, translation etc.
In the example of as shown in Figure 3, download ActiveX control after the user of client inputs website information and this control is installed in client, then clicking the button on ActiveX control, as the button such as " amplification ", " reducing ", " translation ".ActiveX control passes to inner MAPX assembly the request of user.MAPX assembly receives asks from the user of ActiveX control, correspondingly revises map attribute, as map amplified, reducing, translation etc., and presents to user eventually through display screen.Such as, user clicks " amplification " button, MAPX assembly receives this solicited message from ActiveX control, and revise map attribute (such as according to the amendment parameter (such as this magnification ratio) preset, displaying ratio chi), and according to amended map attribute display electronic chart on webpage.Should be appreciated that shown in Fig. 3, interface is just to purpose of explanation, and be not used in restriction, in an embodiment of the present invention, the web interface of any appropriate can be comprised.Such as, web interface can also comprise engineer's scale button at different levels, multiplication factor button, display centre select button etc.
The present invention adopts MAPX establishment of component ActiveX control, successfully achieves the efficient map vector data read on local hard drive under webpage, and reaches the requirement of stepless zooming.
Description above relates to various module.These modules generally include the combination (such as solidification software) of hardware and/or hardware and software.These modules can also comprise the computer-readable medium (such as, non-volatile media) comprising instruction (such as, software instruction), when processor performs these instructions, just can perform various functional characteristics of the present invention.Correspondingly, unless explicitly requested, scope of the present invention is by the restriction of the specific hardware in the module clearly mentioned in embodiment and/or software feature.As non-limitative example, the present invention in an embodiment can by one or more processors (such as microprocessor, digital signal processor, baseband processor, microcontroller etc.) executive software instruction (being such as stored in volatile memory and/or permanent memory).In addition, the present invention can also use application-specific integrated circuit (ASIC) (ASIC) and/or other hardware element to perform.It is pointed out that in the description above to various module, be divided into these modules, is for clarity.But in reality is implemented, the boundary of various module can be fuzzy.Such as, herein arbitrarily or all functions module can share various hardware and/or software element.Again such as, herein arbitrarily or all functions module can carry out all or part of enforcement by the processor executive software instruction had.In addition, the various software submodules performed by one or more processor can be shared between various software module.Correspondingly, unless explicitly requested, scope of the present invention is not by the restriction of mandatory boundary between various hardware and/or software element.
Although the present invention is described by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, various conversion can also be carried out and be equal to substituting to the present invention.In addition, for particular condition or material, various amendment can be made to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes fallen within the scope of the claims in the present invention.
Claims (4)
1. the map-indication method under Browser/Server Mode, in client by browser display electronic chart, is characterized in that, comprise the following steps:
S1, described client download map vector data from map server, and carry out preliminary treatment to generate electronic map file to described map vector data; Described client carries out classification to described map vector data;
Electronic map file described in S2, described client-cache; Described client also stores the data relevant to map attribute; Described map attribute comprises displaying ratio chi and map area scope;
S3, described client show described electronic map file according to the map attribute preset;
S4, described client receive user request information; Described user request information comprises the solicited message about the solicited message of enlarged map, the solicited message reducing map and translation map;
The map attribute that S5, described client are relevant to the display of described electronic map file according to user request information amendment; Described client is map attribute according to amendment parameter modification also; Described amendment parameter comprises this magnification ratio, this reduce in scale, this translation distance, maximum magnification ratio, maximum reduce in scale and maximal translation distance;
S6, described client show described electronic map file according to amended map attribute.
2. the map-indication method under Browser/Server Mode according to claim 1, is characterized in that, described amendment parameter inputs by factory default or by user.
3. a client, is characterized in that, comprising:
Download module, for downloading map vector data from map server, and carries out preliminary treatment to described map vector data thus generates electronic map file; Also for carrying out classification to map vector data;
Memory module, for receiving electronic map file from described download module, and electronic map file described in buffer memory, also for storing the data relevant to map attribute; Described map attribute comprises displaying ratio chi and map area scope;
Display module, for reading electronic map file from described memory module, and shows described electronic map file according to the map attribute stored in described memory module;
Subscriber Interface Module SIM, inputs for the user received about user request information; Described user request information comprises the solicited message about the solicited message of enlarged map, the solicited message reducing map and translation map;
Attribute modification module, for receiving described user request information from described Subscriber Interface Module SIM, and according to described user request information amendment storage described map attribute in a storage module; Also for map attribute according to amendment parameter modification; Described amendment parameter comprises this magnification ratio, this reduce in scale, this translation distance, maximum magnification ratio, maximum reduce in scale and maximal translation distance.
4. client according to claim 3, is characterized in that, described amendment parameter inputs by factory default or by user.
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| CN105575254B (en) * | 2014-11-11 | 2019-10-22 | 高德信息技术有限公司 | Electronic map road rendering method and device |
| CN104537031B (en) * | 2014-12-19 | 2018-06-08 | 百度在线网络技术（北京）有限公司 | The amending method and device of a kind of map datum |
| CN107941235A (en) * | 2016-10-13 | 2018-04-20 | 阿里巴巴集团控股有限公司 | A kind of methods of exhibiting of navigation map, device, the device and operating system |
| CN108304515A (en) * | 2018-01-23 | 2018-07-20 | 上海载德信息科技有限公司 | Map-indication method, device, server based on browser and storage medium |
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