CN1828586A - Computer electronic map formation and display method based on Flash technology - Google Patents
Computer electronic map formation and display method based on Flash technology Download PDFInfo
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- CN1828586A CN1828586A CN 200510111759 CN200510111759A CN1828586A CN 1828586 A CN1828586 A CN 1828586A CN 200510111759 CN200510111759 CN 200510111759 CN 200510111759 A CN200510111759 A CN 200510111759A CN 1828586 A CN1828586 A CN 1828586A
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Abstract
The method comprises: dividing the map information into map blocks to store in the server; calling opposite block information according to user operation, buffering the block, and displaying the information on bottom map; deciding whether user operation needs new block; moving the block information or calling new block to buffer and display. This invention has ideal display effect, reduces system and network load, and has wide application.
Description
Technical field
The present invention relates to graphical information service (Internet GIS:Internet Geographic Information Services) field, the Internet, be particularly related to map generalization electronically and demonstration field, be meant that specifically the electronic chart based on the Flash technology generates and the method that shows on a kind of computing machine.
Background technology
Internet develops on an unprecedented scale, and makes the function towards each aspect user of electronic chart search becoming broad development.The user can be directly by browser to geographic information data search for, chart, operation etc.The user can search address and walking, public transport or the route of driving by electronic chart easily, and this has greatly made things convenient for user's searching address, road.The user again need not search the position of certain address, the perhaps way to get there on certain bar road on a huge map made of paper.
In at present numerous Internet electronic chart functions, all be that the user submits the map inquiry request to back bench web, back bench web is connected with map server according to the request of submitting to, obtain corresponding map picture, then the routing information of correspondence or address information are spliced into one or many complete maps through processing back and the map picture that obtains and return to Website server.Displayed map picture on the page at last.This mode is very high to the performance requirement of background server, and the following process to map picture need expend a large amount of calculating and time simultaneously.Because this mode is difficult to realize the buffer memory of map at subscriber's local, cause the user to ask map simultaneously at every turn, all must submit to background server, regenerate new map and return to front page layout again, the bothersome effort again of this processing mode, effect is also undesirable.Especially to the user, the map that front page layout is seen does not have continuity, is unfavorable for user's operation yet.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide a kind of cartographic information generate, display effect higher with display speed better, can effectively reduce system and offered load, operation practical and convenient, be convenient to function expansion, stable and reliable working performance, applicable surface comparatively widely on the computing machine electronic chart based on the Flash technology generate and the method that shows.
In order to realize above-mentioned purpose, the electronic chart based on the Flash technology on the computing machine of the present invention generates with the method that shows as follows:
Electronic chart based on the Flash technology on this computing machine generates and the method that shows, comprises the foreground client, backstage service end and the map server that connect successively by network, and its principal feature is that described method may further comprise the steps:
(1) cartographic information is divided into a plurality of map stripping and slicing information according to default division rule;
(2) with described a plurality of map stripping and slicing information stores on map server;
(3) foreground client is sent the request of calling corresponding map stripping and slicing information according to user's query manipulation to the backstage service end;
(4) the backstage service end is sent to map server with described request, and receives the corresponding map stripping and slicing information that map server returned;
(5) background server is sent to foreground client with described map stripping and slicing information;
(6) foreground client is carried out caching to corresponding map stripping and slicing information, and with Flash interface form corresponding map stripping and slicing information is presented on the bottom map;
(7) foreground client judges whether user's map drag operation needs the new map stripping and slicing of request call;
(8) if do not need, then directly in the Flash interface with corresponding map stripping and slicing information along with the bottom map moves to new position together;
(9) if desired, then foreground client is sent the request of calling corresponding map stripping and slicing information to the backstage service end;
(10) the backstage service end is sent to map server with described request, and receives the corresponding map stripping and slicing information that map server returned;
(11) background server is sent to foreground client with described map stripping and slicing information;
(12) foreground client is carried out caching to corresponding map stripping and slicing information, and with Flash interface form corresponding map stripping and slicing information is presented on the bottom map.
The division rule that generates with the map stripping and slicing of the method that shows based on the electronic chart of Flash technology on this computing machine is: with whole map according to vertically, laterally two-wayly cut apart with fixed size.
On this computing machine based on the electronic chart of Flash technology generate size with the map stripping and slicing of the method that shows be in the foreground client Flash display interface map viewing area area 1/9～1/4.
The caching that map stripping and slicing information is carried out that generates with the method that shows based on the electronic chart of Flash technology on this computing machine may further comprise the steps:
(1) judges whether the map stripping and slicing information cache formation of pre-set length is full;
(2) if less than, then directly will need the map stripping and slicing information of buffer memory to send in this buffer queue;
(3) if full,, will have the map stripping and slicing information deletion that shows the time the earliest then according to the last demonstration time-sequencing of each map stripping and slicing information in the buffer queue;
(4) will need the map stripping and slicing information of buffer memory to send in this buffer queue.
The length that generates with the buffer queue of the method that shows based on the electronic chart of Flash technology on this computing machine is 100.
The memory module that generates with the map stripping and slicing information of the method that shows based on the electronic chart of Flash technology on this computing machine is a picture, and its property value comprises the essential information of map stripping and slicing title, picture positional information, engineer's scale information and bottom map.
The picture positional information that generates with the method that shows based on the electronic chart of Flash technology on this computing machine is the longitude and the latitude value at four angles of picture.
Whether the map drag operation of judging the user that generates with the method that shows based on the electronic chart of Flash technology on this computing machine needs the new map stripping and slicing of request call may further comprise the steps:
(1) pull the operation of map according to the user, foreground client judges whether mouse displacement has exceeded the sideline of the map stripping and slicing in the existing Flash interface display zone;
(2), then return the result who does not need the new map stripping and slicing of request call if do not exceed;
(3) if exceed, then the position of the displayed map before mouse location information that will newly exceed and the mouse drag compares;
(4) size of stripping and slicing calculates required new stripping and slicing quantity and the corresponding relative position that has the map stripping and slicing now according to the map;
(5) above-mentioned stripping and slicing quantity and relative position information are as a result of returned.
Electronic chart based on the Flash technology on this computing machine generates the displacement that comprises the mouse upper and lower, left and right with the mouse displacement of the method that shows.
Adopted that the electronic chart based on the Flash technology generates and the method that shows on the computing machine of this invention, cut apart the corresponding cartographic information of storage owing to adopted reusable map stripping and slicing, carry out map stripping and slicing buffer memory in foreground client, and utilize the Flash technology on the interface, to splice in real time and displayed map stripping and slicing information, simultaneously operate real-time request backstage service end and call required new map stripping and slicing according to the user, thereby making cartographic information generate with display speed improves greatly, display effect is also comparatively desirable, need not repeatedly to import the map of the same area, thereby reduced the load of system and network effectively; Moreover, this method has realized " What You See Is What You Get " in that bigger improvement is arranged aspect user's the practicality concerning the user, and simple and quick, can finish multiple practical and convenient feature operation; Simultaneously, this method is convenient to carry out the map application function expansion, highlighted demonstration, the map area that comprises the moving of the moving of bottom map, upper strata map, address and routing information delineated etc., and stable and reliable working performance, applicable surface is comparatively extensive, obtains to people's information to bring great convenience.
Description of drawings
Fig. 1 is based on the electronic chart generation of Flash technology and the map interface synoptic diagram of the method that shows on the computing machine of the present invention.
Fig. 2 calls new map stripping and slicing interface synoptic diagram for generating based on the electronic chart of Flash technology on the computing machine of the present invention when user with the method that shows pulls map.
Fig. 3 is based on the electronic chart generation of Flash technology and the system deployment synoptic diagram of the method that shows on the computing machine of the present invention.
Fig. 4 is that electronic chart generation based on the Flash technology is formed synoptic diagram with the systemic-function of the method that shows on the computing machine of the present invention.
Fig. 5 utilizes method of the present invention to carry out the interface synoptic diagram of the mutual operation of the Flash map and the page.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.
See also illustrated in figures 1 and 2ly, generate and the method that shows based on the electronic chart of Flash technology on this computing machine, comprise the foreground client, backstage service end and the map server that connect successively by network, wherein, described method may further comprise the steps:
(1) cartographic information is divided into a plurality of map stripping and slicing information according to default division rule, the division rule of this map stripping and slicing is: with whole map according to vertically, laterally two-wayly cut apart with fixed size, wherein the size of this map stripping and slicing be in the foreground client Flash display interface map viewing area area 1/9～1/4, the memory module of this map stripping and slicing information is a picture, its property value comprises map stripping and slicing title, the picture positional information, the essential information of engineer's scale information and bottom map, wherein, this picture positional information is the longitude and the latitude value at four angles of picture;
(2) with described a plurality of map stripping and slicing information stores on map server;
(3) foreground client is sent the request of calling corresponding map stripping and slicing information according to user's query manipulation to the backstage service end;
(4) the backstage service end is sent to map server with described request, and receives the corresponding map stripping and slicing information that map server returned;
(5) background server is sent to foreground client with described map stripping and slicing information;
(6) foreground client is carried out caching to corresponding map stripping and slicing information, and with Flash interface form corresponding map stripping and slicing information is presented on the bottom map, and this caching may further comprise the steps:
(a) judge whether the map stripping and slicing information cache formation of pre-set length is full, and in the present embodiment, the length of this buffer queue is 100;
(b) if less than, then directly will need the map stripping and slicing information of buffer memory to send in this buffer queue;
(c) if full,, will have the map stripping and slicing information deletion that shows the time the earliest then according to the last demonstration time-sequencing of each map stripping and slicing information in the buffer queue;
(d) will need the map stripping and slicing information of buffer memory to send in this buffer queue;
(7) foreground client judges whether user's map drag operation needs the new map stripping and slicing of request call, and this decision operation may further comprise the steps:
(a) pull the operation of map according to the user, foreground client judges whether mouse displacement has exceeded the sideline of the map stripping and slicing in the existing Flash interface display zone, and this mouse displacement comprises the displacement of mouse upper and lower, left and right;
(b), then return the result who does not need the new map stripping and slicing of request call if do not exceed;
(c) if exceed, then the position of the displayed map before mouse location information that will newly exceed and the mouse drag compares;
(d) size of stripping and slicing calculates required new stripping and slicing quantity and the corresponding relative position that has the map stripping and slicing now according to the map;
(e) above-mentioned stripping and slicing quantity and relative position information are as a result of returned;
(8) if do not need, then directly in the Flash interface with corresponding map stripping and slicing information along with the bottom map moves to new position together;
(9) if desired, then foreground client is sent the request of calling corresponding map stripping and slicing information to the backstage service end;
(10) the backstage service end is sent to map server with described request, and receives the corresponding map stripping and slicing information that map server returned;
(11) background server is sent to foreground client with described map stripping and slicing information;
(12) foreground client is carried out caching to corresponding map stripping and slicing information, and with Flash interface form corresponding map stripping and slicing information is presented on the bottom map, and the process of this caching is identical with aforesaid process.
In the method for the invention, the map stripping and slicing is that the stripping and slicing size is identical in the same pattern uniformly.The variable size of stripping and slicing, can in background application, define, cutting apart whole map of stripping and slicing simultaneously according to vertical, horizontal two-way cutting, and the principle that the stripping and slicing size is determined is 1/4,1/6,1/9 more suitable with the viewing area size of flash map.Usually calculate according to viewing area 800 * 600pixel, more suitable with the stripping and slicing of 200 * 200pixel size.Because actual application environment is used in the middle of a plurality of systems, so size separately is all different, but cardinal rule is identical.
The map stripping and slicing can be with the various modes storing map information, and as PNG, JPEG, GIF, BMP etc., memory module can dispose in background application.Every map stripping and slicing comprises positional information, the engineer's scale information of picture, the essential information of bottom map.And the file layout of map is supported now is PNG, JPEG, GIF, BMP picture, is needing which kind of type to dispose in background program in concrete the application.
Comprise this map stripping and slicing longitude, latitude value (belonging to horizontal ordinate), the title (picture name) of map stripping and slicing, corresponding engineer's scale value, the positional information (positions in all the map strippings and slicings in the engineer's scale of place) of stripping and slicing at four angles up and down in the property value of map stripping and slicing.The essential information of bottom map is used relevantly with concrete, and generally includes road name, road, information such as overhead in this information.
When the user dragged map, application layer was according to new request stripping and slicing and the existing relative position information request background system that shows stripping and slicing, and background system returns to application system according to special algorithm with the new stripping and slicing of the relative position of request.Algorithm is latitude and longitude information calculating according to the map, and is specific as follows:
(1) drag the operation of map according to the user, the map in the current flash viewing area is followed mouse and is moved together, and the flash program end judges whether mouse displacement (up and down) has exceeded the map stripping and slicing sideline that has now in the flash viewing area;
(2), then do not do any operation (but the map current flash viewing area in follow mouse mobile together) if do not exceed map stripping and slicing sideline in the existing flash viewing area up and down;
(3) if having any one side or 2 limits to exceed the map stripping and slicing sideline that has now in the flash viewing area simultaneously up and down, then make comparisons in the position of the displayed map before mouse location information that will newly exceed and the mouse drag, the length and width of stripping and slicing are calculated the stripping and slicing quantity and the corresponding relative position that has the map stripping and slicing now that need increase newly and (are hauled out the right side of existing scope as mouse according to the map, think that then the interior map location in the existing relatively zone of map of new importing is the right side of horizontal ordinate), according to this relative position information request background server, obtain the latitude and longitude information of corresponding map stripping and slicing picture and map stripping and slicing;
Simultaneously, consider the routine processes ability level of at present general foreground client's application end, the right quantity of the map stripping and slicing of buffer memory is 100 among the Flash, but this numeral can be done corresponding adjustment according to client's application end internal memory processing power.Wherein, the size of each stripping and slicing is usually about 5KB～20KB, and mean value is in the appearance of 15KB, 100 1500KB altogether.
To follow the principle of formation first in first out during Flash uses and carry out buffer memory, arrange smoothly according to the last demonstration time of all map strippings and slicings that showed, will more early being deleted of first more demonstration.The map stripping and slicing of when reaching largest buffered and count, standing out and showing according to this treatment principle deletion.
In the middle of reality is used, see also shown in Figure 3, electronic map system based on the Flash technology of the present invention is deployed in respectively on application server and the map server, its common Flash application program of supporting foreground client, in this electronic map system based on the Flash technology, the user only need be in the start-stop address of foreground client Input Address title or request, the Flash electronic chart just can be connected with the backstage, website, the backstage is connected with map server according to the content of request, ask corresponding a plurality of map stripping and slicing (generating in advance, can be reusable).A plurality of map strippings and slicings that the backstage, website directly will obtain return to Flash, finally with Flash interface form displayed map, and in the Flash aspect corresponding address, path and other information are presented on the bottom map, to realize complete map search figure as a result.When the user pulls map in Flash, need not to ask again backstage, website and map server to regenerate map, but only need directly to get final product to the extra-regional map stripping and slicing of the current displayed map of map server application (having generated in advance), the upper strata figure layer and the data of having spliced in the early time in Flash simultaneously need not to regenerate, and only need to get final product along with base map moves together.And nearest used several, tens even a hundreds of map stripping and slicing and other relevant informations of buffer memory in Flash.
Electronic map system of the present invention is to be show media with Flash, and the map stripping and slicing assembly unit of many fixed sizes is got up, and finally represents complete map to the user.This map provides drag function, when the user presses and simultaneously during rolling mouse, the Flash electronic chart will be followed mouse and be made corresponding mobile.At this moment, the map stripping and slicing that is moved to outside the viewing area will be buffered (perhaps deletion), and the map display area that newly moves into will import corresponding stripping and slicing.These characteristics greatly improve the boot speed of map, have realized " What You See Is What You Get " concerning the user, and need not repeatedly to import the map (and at present a lot of map shows that the website all needs according to the new map of the each generation of user's request) of the same area.
Electronic map system of the present invention in displayed map, the address or the road of also can highlighted explicit user asking.Carry out initialized the time at it, can import corresponding address information or routing information (comprising a little longitude and latitude and title of address, road information etc.) from the background program end.Flash will be saved in this type of information in the internal memory.Flash is when importing each map stripping and slicing, and each map stripping and slicing will show the address that the single or multiple requests in this zone show according to the longitude and latitude scope that is comprised.In required viewing area, will be the highlighted demonstration of pairing road.When the user pulled map, address and road will be followed the map making corresponding mobile.
Therefore, see also shown in Figure 4ly, on the basis based on the above implementation method of the present invention, the user can finish the various functions shown in the figure in this electronic map system, and can produce the good function and the effect of following many aspects:
1. when mouse pulls map, the current map that has shown will be followed mouse and be moved together, can't disappear, and when mouse discharges, need not to refresh the map of viewing area.
2.Flash be to adopt the parallel mode that imports in the process that imports the map stripping and slicing, to improve the efficient that map shows.Thereby, in the Flash application layer, when importing new map stripping and slicing, will directly import for the relative position of current displayed map stripping and slicing is parallel according to different map strippings and slicings, promptly multithreading imports in flash, and each new map stripping and slicing takies a thread.Purpose is in order to shorten the time that single-threaded map imports.Simultaneously, in this electronic map system, the quantity that imports the map stripping and slicing in the quantity of multithreading and same time is relevant, and actual quantity is then relevant with the map stripping and slicing number that can import at most in the viewing area.Comprise 9 strippings and slicings at most as the viewing area, then can ask simultaneously 9 threads to import 9 strippings and slicings at most.This multithreading is different from the notion of the multithreading among JAVA, the C, but belongs to the multithreading among the Flash, and actual is to equal to ask simultaneously in Flash a plurality of connections.
3. if when the path of highlighted demonstration is arranged on map, in pulling the map process, the path of current demonstration also will be followed mouse and be moved together, when mouse discharges, still maintain the original state, and can't disappear or refresh demonstration again.
4. if when the single or multiple address of highlighted demonstration is arranged on map, in pulling the map process, the single or multiple addresses of current demonstration also will be followed mouse and be moved together, when mouse discharges, still maintain the original state, and can't disappear or refresh demonstration again.
5. for improving the efficient of Flash displayed map, only highlighted demonstration drops on the path in its scope in current map display area.When mouse is hauled out current region, program will be according to certain algorithm characteristics, follows the map stripping and slicing of new request successively and shows in the lump dropping on path in the new request map area.And be parallel display mode.Owing to comprise numerous some position information in the routing information, Flash is originally lower in handling numerous position information and finishing the efficient of drawing, and draws the low defective of point efficiency so the characteristic that this block parallel of this electronic map system shows paths has remedied Flash greatly.Wherein, each map stripping and slicing all comprises corresponding longitude and latitude range information, will be by query contents through inquiring corresponding latitude and longitude information after the computing in background system, mate according to the longitude and latitude scope of its latitude and longitude information and viewing area then, if drop in the longitude and latitude scope of a certain map stripping and slicing, then do relative position according to the longitude and latitude of the highlighted displaying contents of need and size, the longitude and latitude scope of the stripping and slicing that falls again and calculate, in new figure layer with its label of the highlighted demonstration of relative position and the information content of fallen stripping and slicing.
6. the details figure layer of the path of highlighted demonstration and address is semi-transparent mode, can see the map of bottom clearly to make things convenient for the user.This semi-transparent mode is the transparent display effect of figure layer of having used Flash, realizes that on difference figure layer the method for translucent stack realizes final translucent effect, and it is the mature technology among the Flash.
7. waiting for that Flash imports in the process of map, this electronic chart is waited for animation for each map stripping and slicing is provided with dynamic an importing, expresses and informs that the user waits for the importing of map.
8. this electronic chart has been realized in the interactive operation of the Internet page: can or highlight a certain address tag and address details figure layer by javascript direct control Flash electronic chart moving map from Internet page function.
9. delineating of map area is provided, comprises ellipse, circle or polygon.The area of realizing the zone of delineating calculates; Combine with Application Service Function, the security set (combining with cell-phone function) in the zone of delineating is provided for the user.In actual applications, can utilize mouse to click and delineate the zone.As delineate ellipse, to calculate radian according to the displacement that mouse drop point and mouse move, and follow mouse and move the ellipse that recomputates also translucent highlighted demonstration correspondence, after mouse discharges, according to the area of the longitude and latitude range computation reality of the area type of being delineated, size and the single or multiple strippings and slicings that fallen; Aspect security set, comprise polytype (relevant) with service application, as a certain zone is set, with its safety zone as certain user, after setting is finished, if corresponding customer location exceeds this zone (utilizing the GPS location technology of mobile phone end or other equipment), application program will notify user (I or other related personnel) to exceed the safety zone with short message or other modes.This function is very effectual aspect Secure Application.
10. the user can directly locate the address details (reverse geocoding) that finds out anchor point on map.
11. the user can locate terminal and obtain the distance in path, place on map.Here, can calculate its displacement on map, and calculate the actual range of point-to-point transmission according to the longitude and latitude range information of its pairing single or multiple map strippings and slicings according to the terminal that the user locatees.Wherein the computing formula of distance between two points is as follows:
Distance between two points=1.1 * 10
2* ((dDelLon * Cos ((ll_lat+ur_lat) * DEG_TO_RAD/2))
2+ dDelLat
2)
1/2
Wherein:
Ll_lat represents less in 2 latitude value;
Ll_lon represents less in 2 longitude;
Ur_lat represents bigger in 2 latitude value;
Ur_lon represents bigger in 2 longitude;
DEG_TO_RAD＝π/180.0；
2 latitude difference: dDelLat=ll_lat-ur_lat;
2 longitude difference: dDelLon=ll_lon-ur_lon.
12. location, the zonule of single or multiple positioning address: if single or multiple address tags are arranged on map, this electronic chart provides the figure layer of a zonule, with optimum map displaying ratio single or multiple address labels are shown in the zone, make things convenient for relative position and absolute position between whole user assurance address.And realize interoperability with the bottom big map, can in the bottom big map, choose a certain address, simultaneously this address of highlighted demonstration in the browse graph layer of zonule; When in the zonule, choosing a certain address, map moved to the appropriate address position with being reflected to simultaneously in the bottom big map.Zonule location map layer can be hidden or show.The zonule of single or multiple positioning address is wherein orientated as: will be according to the relative position of some position information (latitude and longitude value) in the longitude and latitude range computation All Ranges of pairing single or multiple map strippings and slicings, and be presented in the zonule.The zonule is meant increases a little figure layer in addition on the Flash map, with the overall picture of smaller scale displayed map.Displaying ratio is decided according to concrete application in the appearance of 1: 4 or 1: 6.Because on the Flash map, may there be a plurality of positions informational needs to show simultaneously, but map can drag, so may after dragging, cause certain some position information not drop in the viewing area, but the user looks for this some position information for convenience, just be provided with a zonule, can show a plurality of positions information simultaneously, make things convenient for the user to look for.
13. the map of current display area can be led into pdf document output.
14. the some position information according to movement locus on the Flash electronic chart realizes dynamic trajectory simulation or trace playback.Here, according to movement locus have a few the position latitude and longitude value of information and the longitude and latitude scope of place map stripping and slicing is done coupling, determine the relative position of the position of having a few, and combine with service logic, according to the appearance order order demonstration forward or backwards of some position on the actual motion track, and the tie point position is to demonstrate the actual motion route of things.Its fundamental purpose is in order to demonstrate the needs of user's actual motion track, as drive in certain the period road of passing by of user.
15. on address details figure layer, provide lower link, realize that the zonule shows the function of many contents.And provide peer link or function of search.Lower link realizes that the zonule shows that many contents are meant the new show layers of realization on the bottom map, with details content and other correlation functions of demonstration specific address, as sets up hyperlink, search etc.This lower link is similar to the scroll bar of browser, the latitude and longitude information of corresponding address or better address can be opened new searched page as search content in the middle of Flash and search for etc.
16. the size of map stripping and slicing can change according to the configuration of program.
17. see also shown in Figure 5ly, can carry out the mutual operation of the Flash map and the page according to the mode among the figure.Corresponding address in page mid point wherein, to call the javascript code and the Flash map is mutual, the latitude and longitude information of address is passed to Flash, Flash mates the longitude and latitude scope of the map stripping and slicing in latitude and longitude information and the viewing area, find position, corresponding position, and the map center position moved to this point position information, and with the bright demonstration of details figure floor height of corresponding address.To echo mutually with the page.
Adopted on the above-mentioned computing machine based on the electronic chart generation of Flash technology and the method that shows, cut apart the corresponding cartographic information of storage owing to adopted reusable map stripping and slicing, carry out map stripping and slicing buffer memory in foreground client, and utilize the Flash technology on the interface, to splice in real time and displayed map stripping and slicing information, simultaneously operate real-time request backstage service end and call required new map stripping and slicing according to the user, thereby making cartographic information generate with display speed improves greatly, display effect is also comparatively desirable, need not repeatedly to import the map of the same area, thereby reduced the load of system and network effectively; Moreover, this method has realized " What You See Is What You Get " in that bigger improvement is arranged aspect user's the practicality concerning the user, and simple and quick, can finish multiple practical and convenient feature operation; Simultaneously, this method is convenient to carry out the map application function expansion, highlighted demonstration, the map area that comprises the moving of the moving of bottom map, upper strata map, address and routing information delineated etc., and stable and reliable working performance, applicable surface is comparatively extensive, obtains to people's information to bring great convenience.
In this instructions, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (9)
1, the electronic chart based on the Flash technology generates and the method that shows on a kind of computing machine, comprises the foreground client, backstage service end and the map server that connect successively by network, it is characterized in that described method may further comprise the steps:
(1) cartographic information is divided into a plurality of map stripping and slicing information according to default division rule;
(2) with described a plurality of map stripping and slicing information stores on map server;
(3) foreground client is sent the request of calling corresponding map stripping and slicing information according to user's query manipulation to the backstage service end;
(4) the backstage service end is sent to map server with described request, and receives the corresponding map stripping and slicing information that map server returned;
(5) background server is sent to foreground client with described map stripping and slicing information;
(6) foreground client is carried out caching to corresponding map stripping and slicing information, and with Flash interface form corresponding map stripping and slicing information is presented on the bottom map;
(7) foreground client judges whether user's map drag operation needs the new map stripping and slicing of request call;
(8) if do not need, then directly in the Flash interface with corresponding map stripping and slicing information along with the bottom map moves to new position together;
(9) if desired, then foreground client is sent the request of calling corresponding map stripping and slicing information to the backstage service end;
(10) the backstage service end is sent to map server with described request, and receives the corresponding map stripping and slicing information that map server returned;
(11) background server is sent to foreground client with described map stripping and slicing information;
(12) foreground client is carried out caching to corresponding map stripping and slicing information, and with Flash interface form corresponding map stripping and slicing information is presented on the bottom map.
2, electronic chart based on the Flash technology generates and the method that shows on the computing machine according to claim 1, it is characterized in that the division rule of described map stripping and slicing is: whole map is cut apart with fixed size according to vertical, laterally two-way.
3, generate and the method that shows based on the electronic chart of Flash technology on the computing machine according to claim 2, it is characterized in that, the size of described map stripping and slicing be in the foreground client Flash display interface map viewing area area 1/9～1/4.
4, electronic chart based on the Flash technology generates and the method that shows on the computing machine according to claim 1, it is characterized in that the described caching that map stripping and slicing information is carried out may further comprise the steps:
(1) judges whether the map stripping and slicing information cache formation of pre-set length is full;
(2) if less than, then directly will need the map stripping and slicing information of buffer memory to send in this buffer queue;
(3) if full,, will have the map stripping and slicing information deletion that shows the time the earliest then according to the last demonstration time-sequencing of each map stripping and slicing information in the buffer queue;
(4) will need the map stripping and slicing information of buffer memory to send in this buffer queue.
5, electronic chart based on the Flash technology generates and the method that shows on the computing machine according to claim 4, it is characterized in that the length of described buffer queue is 100.
6, generate and the method that shows according to the electronic chart based on the Flash technology on each described computing machine in the claim 1 to 5, it is characterized in that, the memory module of described map stripping and slicing information is a picture, and its property value comprises the essential information of map stripping and slicing title, picture positional information, engineer's scale information and bottom map.
7, electronic chart based on the Flash technology generates and the method that shows on the computing machine according to claim 6, it is characterized in that described picture positional information is the longitude and the latitude value at four angles of picture.
8, electronic chart based on the Flash technology generates and the method that shows on the computing machine according to claim 7, it is characterized in that whether the described user's of judgement map drag operation needs the new map stripping and slicing of request call may further comprise the steps:
(1) pull the operation of map according to the user, foreground client judges whether mouse displacement has exceeded the sideline of the map stripping and slicing in the existing Flash interface display zone;
(2), then return the result who does not need the new map stripping and slicing of request call if do not exceed;
(3) if exceed, then the position of the displayed map before mouse location information that will newly exceed and the mouse drag compares;
(4) size of stripping and slicing calculates required new stripping and slicing quantity and the corresponding relative position that has the map stripping and slicing now according to the map;
(5) above-mentioned stripping and slicing quantity and relative position information are as a result of returned.
9, electronic chart based on the Flash technology generates and the method that shows on the computing machine according to claim 8, it is characterized in that described mouse displacement comprises the displacement of mouse upper and lower, left and right.
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