CN106126527B - A kind of device and corresponding method of control electronic map scaling - Google Patents
A kind of device and corresponding method of control electronic map scaling Download PDFInfo
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Abstract
The invention discloses the methods of a kind of device of control electronic map scaling and control electronic map scaling, wherein this method includes：When receiving the instruction for reducing map, the target display level narrowed down to is determined, find out multiple target tiles that display is needed in target display level；Wherein, target display level is higher than current display level；The tile that display is currently shown is loaded and reduced according to the rank difference between current display level and target display level；Selection preloads display level, finds out the preloading tile for preloading that fringe region need to load in display level；It is obtained according to priority and preloads tile and target tile, loaded according to the rank difference preloaded between display level and target display level and amplify display preloading tile；After getting target tile, loads and show the target tile to replace the preloading tile of the amplification of corresponding position.
Description
Present patent application be the applying date be on December 30th, 2013, application No. is 201310746249.2, it is entitled
The divisional application of the Chinese invention patent application of " a kind of device and corresponding method of control electronic map scaling ".
Technical field
The present invention relates to electronic map technique fields, and in particular to a kind of device and control electricity of control electronic map scaling
The method of sub- map scaling.
Background technology
Electronic map client side at present, according to user diminution map instruction reduce map (refering to Baidu map,
The electronic maps networking client such as Tencent's map clicks reduction button, that is, "-" button, it is known that electronic map technique contracts in field
Small map indicates that the body of a map or chart shown in identical electronic map indication range is big, and geographic details are more rough) when, it needs to add
The tile for carrying the higher level different from current display level, due to needing to ask tile to server and carrying out figure to tile
As the processing such as rendering, so when reducing electronic map, since it is desired that the more time so some tiles cannot be shown in time,
There can be blank in electronic map window；When network performance is bad, the blank of electronic map becomes apparent from.And in electronic map grade
Switching between not is clearly.
Invention content
In view of the above problems, it is proposed that the present invention overcoming the above problem in order to provide one kind or solves at least partly
The method for stating the device and corresponding control electronic map scaling of a kind of control electronic map scaling of problem.
One side according to the present invention, provides a kind of device of control electronic map scaling, which includes：
Target tile arithmetic element, suitable for when receiving the instruction for reducing map, determining the target display level narrowed down to
Not, finding out needs multiple target tiles of display in target display level；Wherein, target display level is than current display level
It is high；First loading unit, suitable for being loaded according to the rank difference between current display level and target display level and reducing display
The tile currently shown；Tile arithmetic element is preloaded, is suitably selected for preloading display level, finds out preloading display level
The preloading tile that middle fringe region need to load；Second loading unit is suitable for obtaining preloading tile and mesh according to priority
Tile is marked, loaded according to the rank difference preloaded between display level and target display level and amplifies display preloading tile；
After getting target tile, loads and show the target tile to replace the tile of the diminution of corresponding position currently shown
With the preloading tile of amplification.
Optionally, the preloading tile arithmetic element is suitably selected for the preloading display level higher than target display level
Not, the body of a map or chart preloaded represented by tile include except when except body of a map or chart represented by the tile of preceding display by
Body of a map or chart represented by the multiple target tile, and each geographic areas preloaded corresponding to tile is each target tile institute
N times of corresponding geographic areas, n=4k, k is natural number, indicates to preload the grade between display level and target display level
It is not poor.
Optionally, first loading unit, suitable for the transverse width of the tile currently shown and longitudinal height contract
It is small to be shown for 1/p, wherein p=2q, q is natural number, indicates that the rank between target display level and current display level is poor；
Second loading unit, suitable for amplifying m times and showing each transverse width for preloading tile and longitudinal height, wherein m
=2k, k is natural number, indicates that the rank preloaded between display level and target display level is poor.
Optionally, which further includes：Buffer unit is suitable for setting local cache, and the tile having been displayed is preserved
In local cache.
Optionally, when the tile having been displayed is stored in local cache by the buffer unit, if the appearance of local cache
Amount is insufficient, then the buffer unit removes least recently used tile from local cache.
Optionally, whether second loading unit is suitable for judging the preloading tile and target tile locally slow
In depositing, if being judged as YES, is read from local cache and preload tile and target tile, if being judged as NO, from server
It downloads and preloads tile and target tile.
Optionally, second loading unit increases the tile of diminution currently shown while loading target tile
With the transparency of the preloading tile of amplification；When the operation for loading target tile is completed, watt of diminution currently shown is removed
The preloading tile and display target tile of piece and amplification.
Optionally, the target tile arithmetic element is suitable for the geographical position of the diminution central point of visible area according to the map
The target display level of coordinate and map is set, conversion obtains reducing the pixel coordinate of central point；Target display level according to the map
Not, the Pixel Dimensions of single target tile that need to be shown are obtained；The Pixel Dimensions of visible area and diminution central point according to the map
Pixel coordinate, obtain the pixel coordinate on two opposite vertex of map visible area；Two of visible area according to the map
The Pixel Dimensions of the pixel coordinate on opposite vertex and the single target tile that need to be shown obtain the target tile in visible area.
According to another aspect of the present invention, a kind of method of control electronic map scaling is provided, wherein this method packet
It includes：When receiving the instruction for reducing map, the target display level narrowed down to is determined, finding out in target display level needs to show
The multiple target tiles shown；Wherein, target display level is higher than current display level；It is shown according to current display level and target
Rank difference between rank loads and reduces the tile that display is currently shown；Selection preloads display level, finds out preloading
The preloading tile that fringe region need to load in display level；It is obtained according to priority and preloads tile and target tile, pressed
It is loaded according to the rank difference preloaded between display level and target display level and amplifies display and preload tile；When getting mesh
Mark tile after, load and show the target tile with replace the diminution of corresponding position the tile currently shown and amplification it is pre-
Load tile.
Optionally, the preloading display level is higher than target display level, the map preloaded represented by tile
Range includes the map except when except body of a map or chart represented by the tile of preceding display represented by the multiple target tile
Range, and n times that each geographic areas preloaded corresponding to tile is the geographic areas corresponding to each target tile, n=4k, k
For natural number, indicate that the rank preloaded between display level and target display level is poor.
Optionally, the rank difference according between current display level and target display level loads and reduces display and works as
The tile of preceding display, including：The transverse width of the tile currently shown and longitudinal height are reduced into 1/p and shown, wherein p
=2q, q is natural number, indicates that the rank between target display level and current display level is poor；It is described to be shown according to preloading
Rank difference between rank and target display level, which loads and amplifies display, preloads tile, including：By each preloading tile
Transverse width and longitudinal height amplify m times and show, wherein m=2k, k is natural number, indicates to preload display level and mesh
The rank marked between display level is poor.
Optionally, this method further includes：Local cache is set；The tile having been displayed is stored in local cache.
Optionally, this method further includes：When the tile having been displayed to be stored in local cache, if the appearance of local cache
Amount is insufficient, then least recently used tile is removed from local cache.
Optionally, described to be specifically included according to priority acquisition preloading tile and target tile：Judge the pre-add
Tile and target tile are carried whether in local cache, if being judged as YES, is read from local cache and preloads tile and mesh
Tile is marked, if being judged as NO, is downloaded from server and preloads tile and target tile.
Optionally, described to load and show the target tile to replace the tile of the diminution of corresponding position currently shown
With the preloading tile of amplification, specifically include：While loading target tile, increases the tile of diminution currently shown and put
The transparency of big preloading tile；When load target tile operation complete when, remove diminution the tile currently shown and
The preloading tile and display target tile of amplification.
Optionally, it is described find out needed in target display level display multiple target tiles, including：It is visual according to the map
The geographical position coordinates of the diminution central point in region and the target display level of map, the pixel that conversion obtains reducing central point are sat
Mark；Target display level according to the map obtains the Pixel Dimensions of single target tile that need to be shown；Visible area according to the map
Pixel Dimensions and reduce central point pixel coordinate, obtain the pixel coordinate on two opposite vertex of map visible area；
The Pixel Dimensions of the pixel coordinate on two opposite vertex of visible area and the single target tile that need to be shown obtain according to the map
Target tile in visible area.
The device of control electronic map scaling according to the present invention and the method for control electronic map scaling can pass through choosing
It selects to preload display level and load and amplify display and preloads tile, rapidly show fuzzy preloading tile, Yi Jijia
The tile that display is currently shown is carried and reduced, thus solves the prior art when reducing electronic map, since it is desired that more
Time so some tiles cannot be shown in time, can have more blank in electronic map window, reach and reduce
There are the effects of the probability of blank in electronic map window when electronic map.It is loaded by the way that tile will be preloaded and amplifies display mould
The preloading tile of paste, and after getting target tile, load and display target tile is to replace the diminution of corresponding position
The tile currently shown and amplification preloading tile, make the switching unobvious between map level.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, below the special specific implementation mode for lifting the present invention.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 shows the flow chart of the method for control electronic map scaling according to an embodiment of the invention；
Fig. 2 shows the detailed flow charts of step S100 as shown in Figure 1；
Fig. 3 shows the detailed flow chart of step S500 as shown in Figure 1；
Fig. 4 shows the block diagram of the device of control electronic map scaling according to a first embodiment of the present invention；
Fig. 5 shows the block diagram of the device of control electronic map scaling according to a second embodiment of the present invention；And
Fig. 6 shows the schematic diagram for the electronic map client side realized according to the present invention.
Specific implementation mode
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.
The present invention technical concept essentially consist in, receive reduce map instruction when, determine target display level and
Display level is preloaded, fringe region in the target tile that need to be shown and preloading display level is found out and (currently shows
The newly-increased body of a map or chart in tile periphery) the preloading tile that need to load.Due to preloading the number of tile than corresponding target watt
The number of piece is few, and (such as a body of a map or chart preloaded represented by tile is equivalent to other four or 16 or more of lower level
Body of a map or chart represented by multiple target tiles), it is preloaded needed for tile and load preloading tile so being downloaded by server
The time ratio wanted using the prior art by server download target tile and load the target tile required time it is short, pass through by
It preloads tile to load and amplify the fuzzy preloading tile of display, and after getting target tile, loads and show mesh
Mark tile preloads tile with the amplification for replacing corresponding position, and there are the general of blank for electronic map window when reducing map
Rate.Fuzzy the preloadings tile of display, load are loaded and amplified by the way that tile will be preloaded and reduce watt for showing and currently showing
Piece, and after getting target tile, loads and display target tile is currently shown with the diminution for replacing corresponding position
The preloading tile of tile and amplification, electronic map are shown as by obscuring the process of clearly showing that, are made between map level
Switch unobvious.
It should be noted that electronic map tile, i.e. picture in grating map, these pictures are by certain rule, splicing
At a complete electronic map, electronic map is reduced, can show the tile of higher level, the list of higher level in this field
The body of a map or chart that body of a map or chart represented by a tile compares represented by the single tile of low level is big, for example, in adjacent rank
One tile of higher level is equivalent to relatively low rank four and opens body of a map or chart represented by tile, two ranks that rank difference is two
In, a tile of higher level is equivalent to the body of a map or chart represented by 16 tiles of relatively low rank.
Fig. 1 shows the flow chart of the method for control electronic map scaling according to an embodiment of the invention.This method
Include the following steps S100 to step S400：
S100, when receiving the instruction for reducing map, determine the target display level that narrows down to, find out target and show
Multiple target tiles of display are needed in rank；Wherein, target display level is higher than current display level.Wherein, art technology
Personnel it can be appreciated that, target display level be according to user input diminution map instruction depending on, in other words, mesh
Mark display level is the display level of electronic map after operation is completed.Map is reduced in this field, can show higher level
Tile, the body of a map or chart that the body of a map or chart represented by the tile of higher level compares represented by low level tile is big, therefore mesh
It is higher than current display level to mark display level.The method for searching target tile, can be with reference to method as shown in Figure 2, root
Target tile is calculated according to the geographical position coordinates and target display level of the central point of map visible area.Show the target watt
Piece can clearly be reduced after electronic map.
S200, it is loaded according to the rank difference between current display level and target display level and reduces the current display of display
Tile.
Specifically, it is loaded according to the rank difference between current display level and target display level and reduces display and currently shown
The tile shown, including：The transverse width of the tile currently shown and longitudinal height are reduced into 1/p and shown, wherein p=2q,
Q is natural number, indicates that the rank between target display level and current display level is poor.If target display level and current display
Rank difference between rank is 1, then the transverse width of the tile currently shown and longitudinal height is reduced into 1/2 display；If
Rank difference between target display level and current display level is 2, then by the transverse width of the tile currently shown and longitudinal direction
Height is reduced into 1/4 display, and so on.
In the present embodiment, shown by reducing the tile currently shown, it can be rapidly by one of the map after diminution
Subregion rapidly obscures display, and the body of a map or chart on periphery is by following step S300 and S400 rapidly with lower clear
Clear degree is shown.
S300, selection preload display level, find out the preloading for preloading that fringe region need to load in display level
Tile.
In the present embodiment, preloading display level is higher than target display level, preloads the body of a map or chart represented by tile
Including except when body of a map or chart except body of a map or chart represented by the tile of preceding display represented by the multiple target tile,
It needs to remove the current display tile institute table reduced in step S200 in the complete body of a map or chart that display area is shown after reducing
The body of a map or chart shown, that is, above-mentioned " fringe region ", and each geographic areas preloaded corresponding to tile is each target watt
N times of geographic areas corresponding to piece, n=4k, k is natural number, indicates to preload between display level and target display level
Rank it is poor.
Preferably, in the present embodiment, in order to comprehensively show the information on map in more detail, the preservation of electronic map uses
It is classified tile mechanism, map is divided into multiple levels to preserve, corresponding grating map tile is stored under each level, with two-phase
For tile under adjacent display level, (i.e. 2 × 2 be in " field " for four adjacent tiles under the low display level of display level
Four adjacent tiles of font) corresponding to a tile under the high display level of display level；With rank difference be two two
For layer tile, 16 adjacent tiles (i.e. 4 × 4 16 adjacent tiles) under the low display level of display level are right
It should be in a tile under the high display level of display level.In the present embodiment, the method for preloading tile, Ke Yishi are searched
With reference to method as shown in Figure 2, the geographical position coordinates of the diminution central point of visible area and display level is preloaded according to the map
Tile Ji Suan not be preloaded, can also be to be taken by division according to the number of target tile using the correspondence with target tile
Whole operation obtains preloading the number of tile.In the present embodiment, since each preloading tile corresponds to multiple target tiles, so
Body of a map or chart represented by the preloading tile is likely larger than the body of a map or chart represented by the multiple target tile.
S400, preloading tile and target tile are obtained according to priority, it is aobvious according to preloading display level and target
Show that the rank difference between rank loads and amplifies display and preloads tile.By showing that fuzzy amplification preloads tile first,
Loading velocity is fast, reduces the probability for showing blank tile on the electronic map.
In the present embodiment, is loaded according to the rank difference preloaded between display level and target display level and amplify display
Tile is preloaded, including：Each transverse width for preloading tile and longitudinal height are amplified m times and shown, wherein m=2k,
K is natural number, indicates that the rank preloaded between display level and target display level is poor.That is, if preloading display level
Rank difference between target display level is 1 and each transverse width for preloading tile and longitudinal height is enlarged into 2
It is shown again；By each preloading tile if preloading the rank difference between display level and target display level and being 2
Transverse width and longitudinal height be enlarged into 4 times and shown.
S500, after getting target tile, load and show the target tile to replace the diminution of corresponding position
The preloading tile of the tile and amplification that currently show.Working as the diminution of corresponding position is replaced by using clearly target tile
The tile of preceding display and the preloading tile of amplification realize that clear display map and map denotation are clearly indicated by obscuring
Effect.
In summary step S100, S200, S300, S400 and S500, the present embodiment are current by loading and reducing display
The tile of display, selection preload display level and load simultaneously amplifies display and preloads tile, and it is fuzzy clear rapidly to show
Lower preloading tile is spent, the probability that electronic map shows blank tile is reduced.
By executing step S300 and step S400 in the present embodiment, can select one higher than target display level pre-
Loaded and displayed rank and show that amplification in the preloading display level preloads tile.By the way that step S300 is repeatedly carried out
With step S400, multiple preloading display levels higher than target display level and multiple preload of display can also be selected to show
Show that amplification in rank preloads tile, it, can first display level be higher preloads putting in display level in specific implementation
It is big to preload tile, then the lower amplification preloading tile preloaded in display level of display level, equally realize that map is aobvious
Show and clearly indicates effect by obscuring.In addition, it will be understood by a person skilled in the art that, it can also be current to preload display level
Display level.
Further, this method further includes：Local cache is set；The tile having been displayed is stored in local cache.More
Specifically, the present embodiment controls the request frequency of tile by creating local cache.When reducing map, can preferentially it show
The tile of buffered mistake reduces the probability that user sees blank, and can improve loading velocity using caching, in server end
Not plus in the case of caching head, it is also avoided that repetitive requests tile.Then this method of the present embodiment further includes：It will have been displayed
Tile when being stored in local cache, if the off-capacity of local cache, removed from local cache least recently used
Tile.In other words, the realization of caching is using LRU (Least Recently Used, least recently used) strategies, in caching
Tile when being more than the capacity of caching setting, can preferentially eliminate least recently used tile.
Preferably, the selection in above-mentioned steps S300 preloads display level method for distinguishing, it is to select than target display level
High several ranks, selection preloading display level, specifically judges the pre-add in each rank from each rank
It carries tile in the buffer or needs to be downloaded by server, select to need the rank for the tile number minimum downloaded by server to be pre-
Loaded and displayed rank is to accelerate to download the speed for preloading tile from server, further if necessary to be downloaded by server
Tile number it is identical, then preferentially select higher ranked rank be preload display level to reduce the preloading that need to be handled
The number of tile is with further speed up processing.
In the present embodiment, above-mentioned steps S400's specifically wraps according to priority acquisition preloading tile and target tile
It includes：Judge to preload tile and target tile whether in local cache, if being judged as YES, pre-add is read from local cache
Tile and target tile are carried, if being judged as NO, is downloaded from server and preloads tile and target tile.It is slow by preferentially obtaining
Tile in depositing can improve loading velocity.
Fig. 2 shows the detailed flow charts of step S100 as shown in Figure 1.Step S100's finds out target display level
Multiple target tiles that display is needed in not, specifically include following steps：
The geographical position coordinates of the diminution central point of S110, according to the map visible area and the target display level of map,
Conversion obtains reducing the pixel coordinate of central point.
According to projection theory, amplifying has the point of overlapping to indicate identical geographical location, the diminution in two front and back maps
Central point is the constant point in geographical location represented when map reduces.Diminution central point in the present embodiment, makes receiving
It when the diminution map instructions that user is inputted by mouse roller can be the position of mouse, or pass through page receiving user
It can be the center of map when the diminution map instructions of face button (such as "-" button) input.According to the geography for reducing central point
Position coordinates (i.e. latitude and longitude coordinates) and target display level, the pixel coordinate that can obtain reducing central point is (for example, X-Y is sat
Mark).
S120, target display level according to the map, obtain the Pixel Dimensions of single target tile that need to be shown.
From the above mentioned it is found that the preservation of the present embodiment electronic map is using classification tile mechanism, according to target display level,
It can obtain the Pixel Dimensions of single target tile.
The Pixel Dimensions of S130, according to the map visible area and the pixel coordinate for reducing central point, obtain map visible area
The pixel coordinate on two opposite vertex in domain.
In the present embodiment, it is known to reduce the position relationship on the vertex of central point and map visible area, according to target
Display level, can obtain the Pixel Dimensions of visible area after map reduces, therefore can obtain visible area after map reduces
Two opposite vertex pixel coordinate.
Two opposite vertex of the map visible area can be left upper apex and bottom right vertex or upper right top
Point and bottom left vertex just can determine the range of visible area after map diminution by opposite two vertex.
The pixel coordinate on two opposite vertex of S140, according to the map visible area and the single target tile that need to be shown
Pixel Dimensions obtain the target tile in visible area.
Step S140 is specifically included：Obtain lateral index number and the longitudinal direction of the target tile where two opposite vertex
Index number；Choose between the lateral index number for the target tile that lateral index number is located at where two opposite vertex and
Longitudinal index number be located at the target tile between longitudinal index number of the target tile where two opposite vertex to get
To the target tile in map visible area.Wherein, described to obtain the lateral rope of the target tile where two opposite vertex
Draw number and longitudinal index number, specifically includes：The pixel coordinate that vertex is utilized respectively to the vertex subtracts the origin of map
Pixel coordinate obtain the difference of abscissa and the difference of ordinate, utilize the difference of abscissa divided by the width of single target tile
Degree obtains lateral index number, and longitudinal index number is obtained using the difference of ordinate divided by the height of single target tile.
Fig. 3 shows the detailed flow chart of step S500 as shown in Figure 1.The load of step S500 and display target watt
Piece specifically includes following steps to replace the preloading tile of the amplification of corresponding position：
S510, while loading target tile, increase the tile of diminution currently shown and the preloading tile of amplification
Transparency.In other words, when loading target tile, the preloading tile of the tile of diminution currently shown and amplification is gradual
Become transparent.
S520, when load target tile operation complete when, remove the tile of diminution currently shown and the pre-add of amplification
Carry tile and display target tile.Specifically, the tile currently shown reduced corresponding to one or the pre-add of an amplification
When carrying several target tiles load completion of tile, the tile of the diminution currently shown or the preloading tile of amplification are removed,
Several target tiles that display load is completed, keep electronic map apparent.
In the present embodiment, according to different browsers version, different rendering mechanism is provided, improves and renders tile performance, with
Ensure the load in step S400 and amplifies display preloading tile operation and the load in step S500 and display target tile
The fluency of operation.For example, for the browser for supporting webgl interfaces, WebglRenderer is provided and renders mechanism；For branch
The browser for holding HTML5 label Cs anvas provides CanvasRenderer and renders mechanism；For the browser for supporting CSS3, carry
Mechanism is rendered for CSSRenderer；For the lowest versions browser such as IE6, IE7, IE8, FlashRendere is provided and renders mechanism；
For all browsers, DivRenderer is provided and renders mechanism.
Fig. 4 shows the block diagram of the device of control electronic map scaling according to a first embodiment of the present invention.The device packet
It includes target tile arithmetic element 100, preload tile arithmetic element 200, the second loading unit 300 and the first loading unit 400.
Target tile arithmetic element 100, suitable for when receiving the instruction for reducing map, determining that the target narrowed down to is shown
Rank finds out multiple target tiles that display is needed in target display level；Wherein, target display level is than current display level
It is high.Wherein, those skilled in the art it can be appreciated that, target display level be according to user input diminution map finger
Depending on order, in other words, target display level is the display level of electronic map after operation is completed.Specifically, this technology is led
Map is reduced in domain, can show that the tile of higher level, the body of a map or chart represented by the tile of higher level compare low level
Body of a map or chart represented by tile is big, therefore target display level is higher than current display level.The method for searching target tile,
Can be the geographical position coordinates of the central point of visible area and target display level according to the map with reference to method as shown in Figure 2
Target tile is not calculated.Show the electronic map after the target tile can clearly be reduced.
First loading unit 400 is suitable for according to the rank difference load between current display level and target display level simultaneously
Reduce the tile that display is currently shown.Specifically, the first loading unit 400 according to current display level and target display level it
Between rank difference load and reduce transverse width that the tile that currently shows of display includes the tile that will currently show and longitudinal high
Degree is reduced into 1/p and shows, wherein p=2q, q is natural number, indicates the grade between target display level and current display level
It is not poor.If the rank difference between target display level and current display level is 1, by the transverse width of the tile currently shown
It is reduced into 1/2 display with longitudinal height；If the rank difference between target display level and current display level is 2, will work as
The transverse width of the tile of preceding display and longitudinal height are reduced into 1/4 display, and so on.In the present embodiment, by that will work as
The tile of preceding display reduces display, can a part of region of the map after diminution rapidly rapidly be obscured display, periphery
Body of a map or chart by following preloading tile arithmetic element 200 and the second loading unit 300 rapidly with lower clear
Degree is shown.
Tile arithmetic element 200 is preloaded, is suitably selected for preloading display level, finds out and preload side in display level
The preloading tile that edge region need to load.In the present embodiment, tile arithmetic element 200 is preloaded, is suitably selected for showing than target
The high preloading display level of rank, the body of a map or chart preloaded represented by tile includes except when represented by the tile of preceding display
Body of a map or chart except body of a map or chart represented by the multiple target tile, that is, need to show in display area after reducing
Complete body of a map or chart removes the body of a map or chart represented by the current display tile reduced in step S200, that is, above-mentioned " side
Edge region ", and n times that each geographic areas preloaded corresponding to tile is the geographic areas corresponding to each target tile, n=
4k, k is natural number, indicates that the rank preloaded between display level and target display level is poor.
Second loading unit 300 is suitable for obtaining preloading tile and target tile according to priority, aobvious according to preloading
Show that the rank difference between rank and target display level loads and amplifies display and preloads tile；After getting target tile,
It loads and shows the target tile to replace the tile of the diminution of corresponding position currently shown and the preloading tile of amplification.
By showing that fuzzy amplification preloads tile first, loading velocity is fast, reduces and shows blank tile on the electronic map
Probability.The preloading watt of the tile currently shown and amplification of the diminution of corresponding position is replaced by using clearly target tile
Piece realizes that clear display map and map denotation clearly indicate effect by obscuring.
In the present embodiment, the second loading unit 300 is suitable for each transverse width for preloading tile and longitudinal height is equal
M times of amplification is shown, wherein m=2k, k is natural number, indicates to preload the rank between display level and target display level
Difference.That is, by each transverse direction for preloading tile if preloading the rank difference between display level and target display level and being 1
Width and longitudinal height are enlarged into 2 times and are shown；If preloading the rank between display level and target display level
Each transverse width for preloading tile and longitudinal height are enlarged into 4 times and shown by difference for 2.
In the present embodiment, the second loading unit 300 increases currently showing for diminution load target tile while
The transparency of tile and the preloading tile of amplification, in other words, the second loading unit 300 will be reduced when loading target tile
The tile currently shown and the preloading tile of amplification gradually become transparent.Further, when the operation of load target tile
When completion, the second loading unit 300 removes the preloading tile and display target of the tile currently shown and amplification that reduce
Tile.Specifically, several targets watt of the tile currently shown reduced corresponding to one or the preloading tile of an amplification
When piece load is completed, the second loading unit 300 removes the tile of the diminution currently shown or the preloading tile of amplification, display
The several target tiles completed are loaded, keep electronic map apparent.
In the present embodiment, target tile arithmetic element 100 is suitable for the geography of the diminution central point of visible area according to the map
The target display level of position coordinates and map, conversion obtain reducing the pixel coordinate of central point；Target according to the map is shown
Rank obtains the Pixel Dimensions of single target tile that need to be shown；The Pixel Dimensions of visible area and diminution center according to the map
The pixel coordinate of point, obtains the pixel coordinate on two opposite vertex of map visible area；The two of visible area according to the map
The Pixel Dimensions of the pixel coordinate on a opposite vertex and the single target tile that need to be shown obtain the target watt in visible area
Piece.
In the present embodiment, the pixel on the two opposite vertex of visible area according to the map of target tile arithmetic element 100
The method that the Pixel Dimensions of coordinate and the single target tile that need to be shown obtain the target tile in visible area, particular by
Obtain the lateral index number of the target tile where two opposite vertex and longitudinal index number；And choose laterally index
Number is located between the lateral index number of the target tile where two opposite vertex and longitudinal index number is located at two
Target tile between longitudinal index number of target tile where opposite vertex, to obtain in map visible area
Target tile.
Wherein, target tile arithmetic element 100, the pixel coordinate by being utilized respectively vertex to the vertex subtract map
The pixel coordinate of origin obtain the difference of abscissa and the difference of ordinate, utilize the difference divided by single target watt of abscissa
The width of piece obtains lateral index number, and obtaining longitudinal index using the difference of ordinate divided by the height of single target tile compiles
Number.
Fig. 5 shows the block diagram of the device of control electronic map scaling according to a second embodiment of the present invention.The present embodiment
In it is similar to first embodiment as shown in Figure 4, the difference is that, which further includes：Buffer unit 500.
Buffer unit 500 is suitable for setting local cache, and the tile having been displayed is stored in local cache.More
Body, the present embodiment creates local cache by buffer unit 500, controls the request frequency of tile.When reducing map, Neng Gouyou
It first shows the tile being cached, reduces user and see the probability of blank, and load can be improved using buffer unit 500
Speed is also avoided that repetitive requests tile in the case where server end does not add caching head.
Further, when the tile having been displayed is stored in local cache by buffer unit 500, if the appearance of local cache
Amount is insufficient, then buffer unit 500 removes least recently used tile from local cache.Specifically, buffer unit 500 uses
LRU (Least Recently Used, least recently used) strategies, when tile in the buffer is more than the capacity of caching setting,
Least recently used tile can preferentially be eliminated.
Further, second loading unit 300 of the present embodiment, suitable for judging that the preloading tile and target tile be
It is no, if being judged as YES, to be read from local cache in local cache and preload tile and target tile, if being judged as NO,
It is then downloaded from server and preloads tile and target tile.By preferentially obtaining the tile in caching, loading velocity can be improved.
Fig. 6 shows the schematic diagram for the electronic map client side realized according to the present invention.By controlling electronic map contracting
The method of the device and control electronic map scaling put, electronic map client side carry out reduction operation in the instruction according to user
When, electronic map window is there are the probability of blank is small, and electronic map performance makes map grade by obscuring the process of clearly showing that
Switching unobvious between not.
It should be noted that：
Algorithm and display be not inherently related to any certain computer, virtual system or miscellaneous equipment provided herein.
Various general-purpose systems can also be used together with teaching based on this.As described above, it constructs required by this kind of system
Structure be obvious.In addition, the present invention is not also directed to any certain programmed language.It should be understood that can utilize various
Programming language realizes the content of invention described herein, and the description done above to language-specific is to disclose this hair
Bright preferred forms.
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the present invention
Example can be put into practice without these specific details.In some instances, well known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this description.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of each inventive aspect,
Above in the description of exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：It is i.e. required to protect
Shield the present invention claims the more features of feature than being expressly recited in each claim.More precisely, as following
Claims reflect as, inventive aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following specific implementation mode are expressly incorporated in the specific implementation mode, wherein each claim itself
All as a separate embodiment of the present invention.
Those skilled in the art, which are appreciated that, to carry out adaptively the module in the equipment in embodiment
Change and they are arranged in the one or more equipment different from the embodiment.It can be the module or list in embodiment
Member or component be combined into a module or unit or component, and can be divided into addition multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it may be used any
Combination is disclosed to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so to appoint
Where all processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification (including adjoint power
Profit requires, abstract and attached drawing) disclosed in each feature can be by providing the alternative features of identical, equivalent or similar purpose come generation
It replaces.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments means in of the invention
Within the scope of and form different embodiments.For example, in the following claims, embodiment claimed is appointed
One of meaning mode can use in any combination.
The all parts embodiment of the present invention can be with hardware realization, or to run on one or more processors
Software module realize, or realized with combination thereof.It will be understood by those of skill in the art that can use in practice
Microprocessor or digital signal processor (DSP) are come the equipment of realizing control electronic map scaling according to the ... of the embodiment of the present invention
In some or all components some or all functions.The present invention is also implemented as described herein for executing
Some or all equipment or program of device (for example, computer program and computer program product) of method.In this way
Realization the present invention program can may be stored on the computer-readable medium, or can with one or more signal shape
Formula.Such signal can be downloaded from internet website and be obtained, and either be provided on carrier signal or with any other shape
Formula provides.
It should be noted that the present invention will be described rather than limits the invention for above-described embodiment, and ability
Field technique personnel can design alternative embodiment without departing from the scope of the appended claims.In the claims,
Any reference mark between bracket should not be configured to limitations on claims.Word "comprising" does not exclude the presence of not
Element or step listed in the claims.Word "a" or "an" before element does not exclude the presence of multiple such
Element.The present invention can be by means of including the hardware of several different elements and being come by means of properly programmed computer real
It is existing.In the unit claims listing several devices, several in these devices can be by the same hardware branch
To embody.The use of word first, second, and third does not indicate that any sequence.These words can be explained and be run after fame
Claim.
Claims (16)
1. a kind of device of control electronic map scaling, the device include：
Target tile arithmetic element, suitable for when receiving the instruction for reducing map, determining the target display level narrowed down to, looking into
Finding out needs multiple target tiles of display in target display level；Wherein, target display level is higher than current display level, higher
The body of a map or chart that body of a map or chart represented by the tile of rank compares represented by low level tile is big；
First loading unit, suitable for being loaded according to the rank difference between current display level and target display level and reducing display
The tile currently shown；
Tile arithmetic element is preloaded, is suitably selected for preloading display level, finds out and preload fringe region in display level
The preloading tile that need to be loaded；
Second loading unit is suitable for obtaining preloading tile and target tile according to priority, according to preloading display level
Rank difference between target display level, which loads and amplifies display, preloads tile；After getting target tile, load is simultaneously
The target tile is shown to replace the tile of the diminution of corresponding position currently shown and the preloading tile of amplification.
2. the apparatus according to claim 1, wherein
The preloading tile arithmetic element is suitably selected for the preloading display level higher than target display level, the pre-add
It includes except when by the multiple mesh except body of a map or chart represented by the tile of preceding display to carry the body of a map or chart represented by tile
The body of a map or chart represented by tile is marked, and each geographic areas preloaded corresponding to tile is the geography corresponding to each target tile
N times of area, n=4k, k is natural number, indicates that the rank preloaded between display level and target display level is poor.
3. the apparatus according to claim 1, wherein
First loading unit, suitable for the transverse width of the tile currently shown and longitudinal height to be reduced into 1/p and show,
Wherein, p=2q, q is natural number, indicates that the rank between target display level and current display level is poor；
Second loading unit, suitable for amplifying m times and showing each transverse width for preloading tile and longitudinal height,
In, m=2k, k is natural number, indicates that the rank preloaded between display level and target display level is poor.
4. the apparatus according to claim 1, wherein
The device further includes：Buffer unit is suitable for setting local cache, and the tile having been displayed is stored in local cache
In.
5. device according to claim 4, wherein
When the tile having been displayed is stored in local cache by the buffer unit, if the off-capacity of local cache, institute
It states buffer unit and removes least recently used tile from local cache.
6. device according to claim 4 or 5, wherein
Second loading unit is suitable for judging the preloading tile and target tile whether in local cache, if judging
It is yes, is then read from local cache and preload tile and target tile, if being judged as NO, preloading watt is downloaded from server
Piece and target tile.
7. according to the device described in claim 1-5 any claims, wherein
Second loading unit, while loading target tile, increase diminution the tile currently shown and amplification it is pre-
Load the transparency of tile；When the operation for loading target tile is completed, the tile currently shown and the amplification of diminution are removed
Preload tile and display target tile.
8. according to the device described in claim 1-5 any claims, wherein
The target tile arithmetic element is suitable for the geographical position coordinates and map of the diminution central point of visible area according to the map
Target display level, conversion obtain reduce central point pixel coordinate；Target display level according to the map obtains needing to show
Single target tile Pixel Dimensions；The pixel coordinate of the Pixel Dimensions of visible area and diminution central point according to the map, obtains
To the pixel coordinate on two opposite vertex of map visible area；The picture on two opposite vertex of visible area according to the map
The Pixel Dimensions of plain coordinate and the single target tile that need to be shown obtain the target tile in visible area.
9. a kind of method of control electronic map scaling, wherein this method includes：
When receiving the instruction for reducing map, the target display level narrowed down to is determined, finding out in target display level needs
Multiple target tiles of display；Wherein, target display level is higher than current display level, the ground represented by the tile of higher level
The body of a map or chart that figure range compares represented by low level tile is big；
The tile that display is currently shown is loaded and reduced according to the rank difference between current display level and target display level；
Selection preloads display level, finds out the preloading tile for preloading that fringe region need to load in display level；
It is obtained according to priority and preloads tile and target tile, according between preloading display level and target display level
Rank difference load and amplify display preload tile；
After getting target tile, loads and show the target tile to replace currently showing for the diminution of corresponding position
The preloading tile of tile and amplification.
10. according to the method described in claim 9, wherein,
The preloading display level is higher than target display level, it is described preload tile represented by body of a map or chart include in addition to
Body of a map or chart except the body of a map or chart represented by tile currently shown represented by the multiple target tile, and each pre-add
Carry n times that the geographic areas corresponding to tile is the geographic areas corresponding to each target tile, n=4k, k is natural number, is indicated
The rank preloaded between display level and target display level is poor.
11. according to the method described in claim 9, wherein,
The rank difference according between current display level and target display level loads and reduces watt that display is currently shown
Piece, including：The transverse width of the tile currently shown and longitudinal height are reduced into 1/p and shown, wherein p=2q, q is certainly
So number indicates that the rank between target display level and current display level is poor；
It is described that display preloading tile is loaded and amplified according to the rank difference preloaded between display level and target display level,
Including：Each transverse width for preloading tile and longitudinal height are amplified m times and shown, wherein m=2k, k is natural number,
Indicate that the rank preloaded between display level and target display level is poor.
12. according to the method described in claim 9, wherein, this method further includes：
Local cache is set；
The tile having been displayed is stored in local cache.
13. according to the method for claim 12, wherein this method further includes：
When the tile having been displayed to be stored in local cache, if the off-capacity of local cache, is moved from local cache
Except least recently used tile.
14. method according to claim 12 or 13, wherein described obtained according to priority preloads tile and target
Tile specifically includes：
Judge that the preloading tile and target tile whether in local cache, if being judged as YES, are read from local cache
It takes and preloads tile and target tile, if being judged as NO, downloaded from server and preload tile and target tile.
15. according to the method described in claim 9-13 any claims, wherein the load simultaneously shows the target tile
To replace the tile of the diminution of corresponding position currently shown and the preloading tile of amplification, specifically include：
While loading target tile, increase the transparency of the tile of diminution currently shown and the preloading tile of amplification；
When the operation for loading target tile is completed, the tile of diminution currently shown and the preloading tile of amplification and display are removed
Target tile.
16. according to the method described in claim 9-13 any claims, wherein
It is described find out needed in target display level display multiple target tiles, including：
The geographical position coordinates of the diminution central point of visible area and the target display level of map, conversion are contracted according to the map
The pixel coordinate of small central point；
Target display level according to the map obtains the Pixel Dimensions of single target tile that need to be shown；
The pixel coordinate of the Pixel Dimensions of visible area and diminution central point according to the map, obtains two phases of map visible area
To vertex pixel coordinate；
The pixel ruler of the pixel coordinate on two opposite vertex of visible area and the single target tile that need to be shown according to the map
The very little target tile obtained in visible area.
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| CN201610415014.9A CN106126527B (en) | 2013-12-30 | 2013-12-30 | A kind of device and corresponding method of control electronic map scaling |
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| CN201610415014.9A CN106126527B (en) | 2013-12-30 | 2013-12-30 | A kind of device and corresponding method of control electronic map scaling |
| CN201310746249.2A CN103700126B (en) | 2013-12-30 | 2013-12-30 | A kind of device controlling electronic chart scaling and corresponding method |
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| CN103700126B (en) * | 2013-12-30 | 2016-08-17 | 北京奇虎科技有限公司 | A kind of device controlling electronic chart scaling and corresponding method |
| US9728167B2 (en) | 2013-12-30 | 2017-08-08 | Beijing Qihoo Technology Company Limited | Device and method for controlling electronic map |
| CN104376530B (en) * | 2014-12-03 | 2018-01-09 | 上海云尚医药科技有限公司 | A kind of secondary multistage breviary cutting process method of image |
| CN105989130B (en) * | 2015-02-16 | 2019-06-14 | 高德软件有限公司 | Electronic map methods of exhibiting, device and electronic equipment |
| CN105022818A (en) * | 2015-07-08 | 2015-11-04 | 纪兴瑞 | Tile map storing and loading method |
| CN106815344B (en) * | 2017-01-17 | 2019-08-16 | 云南师范大学 | A kind of the amplification method of cutting out and device of electronic map |
| CN107066267B (en) * | 2017-03-27 | 2021-09-07 | 网易（杭州）网络有限公司 | Page size processing method, device and equipment |
| CN106803402B (en) * | 2017-04-05 | 2019-04-16 | 山东慧行天下文化传媒有限公司 | Intelligent guide guide system and method based on the classification display of map pantograph ratio |
| CN109407950A (en) * | 2018-10-17 | 2019-03-01 | 厦门科灿信息技术有限公司 | A kind of multistage Map Switch method, apparatus, equipment and readable storage medium storing program for executing |
| CN109710722A (en) * | 2018-12-27 | 2019-05-03 | 北斗天地股份有限公司 | A kind of method and device of electronic map blind area data processing |
| CN111881230A (en) * | 2020-06-17 | 2020-11-03 | 汉海信息技术(上海)有限公司 | Rendering method and device for map area and electronic equipment |
| CN111862252A (en) * | 2020-07-07 | 2020-10-30 | 博泰车联网(南京)有限公司 | Method, terminal and system for drawing map |
| CN112269782B (en) * | 2020-10-19 | 2022-11-08 | 智慧航海（青岛）科技有限公司 | Multi-chart display method and system based on electronic chart |
| CN114661755A (en) * | 2022-03-29 | 2022-06-24 | 北京百度网讯科技有限公司 | Display mode, device and electronic equipment |
| CN116167091B (en) * | 2023-04-24 | 2023-06-30 | 南京麦堤微林信息科技有限公司 | Mapping data encryption method and system |
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| JPH0950234A (en) * | 1996-07-02 | 1997-02-18 | Sony Corp | Map display method |
| US8490025B2 (en) * | 2008-02-01 | 2013-07-16 | Gabriel Jakobson | Displaying content associated with electronic mapping systems |
| US20100321399A1 (en) * | 2009-06-18 | 2010-12-23 | Patrik Ellren | Maps from Sparse Geospatial Data Tiles |
| CN103034419A (en) * | 2011-10-10 | 2013-04-10 | 上海图龙信息科技有限公司 | Method for classlessly zooming digital map on mobile equipment |
| JP2013114352A (en) * | 2011-11-25 | 2013-06-10 | Aisin Aw Co Ltd | Map image display system, map image display method and program |
| CN102800048B (en) * | 2012-07-06 | 2015-11-25 | 广州亿程交通信息有限公司 | A kind of display packing of electronic chart convergent-divergent |
| CN102819671B (en) * | 2012-07-25 | 2016-02-17 | 深圳市网信联动通信技术股份有限公司 | A kind of method of carrying out data analysis in conjunction with map |
| CN103700126B (en) * | 2013-12-30 | 2016-08-17 | 北京奇虎科技有限公司 | A kind of device controlling electronic chart scaling and corresponding method |
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| CN103700126A (en) | 2014-04-02 |
| CN106126527A (en) | 2016-11-16 |
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