CN106126527A - A kind of device controlling electronic chart scaling and corresponding method - Google Patents
A kind of device controlling electronic chart scaling and corresponding method Download PDFInfo
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- CN106126527A CN106126527A CN201610415014.9A CN201610415014A CN106126527A CN 106126527 A CN106126527 A CN 106126527A CN 201610415014 A CN201610415014 A CN 201610415014A CN 106126527 A CN106126527 A CN 106126527A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/29—Geographical information databases
Abstract
The invention discloses a kind of device controlling electronic chart scaling and the method controlling electronic chart scaling, wherein, the method includes: when receiving the instruction reducing map, determines the target display level narrowed down to, and finds out the multiple target tile needing display in target display level；Wherein, target display level is higher than currently displaying rank；Load according to the rank difference between currently displaying rank and target display level and reduce the tile that display is currently displaying；Select prestrain display level, find out the prestrain tile that in prestrain display level, marginal area need to load；Obtain prestrain tile and target tile according to priority, load according to the rank difference between prestrain display level and target display level and amplify display prestrain tile；After getting target tile, load and show that described target tile is to replace the prestrain tile of the amplification of correspondence position.
Description
Present patent application is filing date December in 2013 30 days, Application No. 201310746249.2, entitled
The divisional application of the Chinese invention patent application of " a kind of device controlling electronic chart scaling and corresponding method ".
Technical field
The present invention relates to electronic map technique field, be specifically related to a kind of device controlling electronic chart scaling and control electricity
The method of sub-map scaling.
Background technology
At present electronic map client side, according to the instruction reducing map of user reduce map (refering to Baidu's map,
The electronic chart networking clients such as Tengxun's map, click on and reduce button i.e. "-" button, it is known that contract in electronic map technique field
The body of a map or chart that little cartographic representation shows in identical electronic chart indication range is big, and geographic details is more rough) time, need to add
Carry the tile of the higher level different from currently displaying rank, owing to needs carry out figure to server request tile and to tile
The process such as picture renders, so when reducing electronic chart, since it is desired that the more time is so some tiles can not be shown in time,
Electronic map window can exist blank；When network performance is the best, the blank of electronic chart becomes apparent from.And in electronic chart level
Switching between Bie is clearly.
Summary of the invention
In view of the above problems, it is proposed that the present invention in case provide one overcome the problems referred to above or at least in part solve on
State a kind of device controlling electronic chart scaling of problem and the corresponding method controlling electronic chart scaling.
According to one aspect of the present invention, it is provided that a kind of device controlling electronic chart scaling, this device includes:
Target tile arithmetic element, is suitable to when receiving the instruction reducing map, determines the target display level narrowed down to
Not, the multiple target tile needing display in target display level are found out；Wherein, target display level is than currently displaying rank
High；First loading unit, is suitable to load according to the rank difference between currently displaying rank and target display level and reduce display
Currently displaying tile；Prestrain tile arithmetic element, is suitably selected for prestrain display level, finds out prestrain display level
The prestrain tile that middle marginal area need to load；Second loading unit, is suitable to obtain prestrain tile and mesh according to priority
Mark tile, loads according to the rank difference between prestrain display level and target display level and amplifies display prestrain tile；
After getting target tile, load and show that described target tile is to replace the currently displaying tile reduced of correspondence position
With the prestrain tile amplified.
Alternatively, described prestrain tile arithmetic element, it is suitably selected for the prestrain display level higher than target display level
Not, the body of a map or chart represented by described prestrain tile include in addition to the body of a map or chart represented by currently displaying tile by
Body of a map or chart represented by the plurality of target tile, and the geographic areas corresponding to each prestrain tile is each target tile institute
N times of corresponding geographic areas, n=4k, k is natural number, represents the level between prestrain display level and target display level
The poorest.
Alternatively, described first loading unit, be suitable to the transverse width of currently displaying tile and longitudinally the most all contract
Little show for 1/p, wherein, p=2q, q is natural number, represents that the rank between target display level and currently displaying rank is poor；
Described second loading unit, is suitable to show the transverse width of each prestrain tile and the most all amplifications m times, wherein, and m
=2k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
Alternatively, this device also includes: buffer unit, is suitable to arrange local cache, and is preserved by the tile shown
In local cache.
Alternatively, when the tile shown is saved in local cache by described buffer unit, if the appearance of local cache
Amount deficiency, the most described buffer unit removes least-recently-used tile from local cache.
Alternatively, described second loading unit, be suitable to judge that described prestrain tile and target tile are the most slow in this locality
In depositing, if being judged as YES, then from local cache, read prestrain tile and target tile, if being judged as NO, then from server
Download prestrain tile and target tile.
Alternatively, described second loading unit, while loaded targets tile, increase the currently displaying tile reduced
Transparency with the prestrain tile amplified；When the operation of loaded targets tile completes, remove currently displaying watt reduced
The prestrain tile of sheet and amplification and display target tile.
Alternatively, described target tile arithmetic element, be suitable to the geographical position reducing central point of viewing area according to the map
Putting the target display level of coordinate and map, conversion obtains reducing the pixel coordinate of central point；Target display level according to the map
, the Pixel Dimensions of the single target tile that need to show is not obtained；The Pixel Dimensions of viewing area and reduce central point according to the map
Pixel coordinate, obtain the pixel coordinate on two relative summits of map viewing area；Two of viewing area according to the map
The target tile that the pixel coordinate on relative summit and the Pixel Dimensions of single target tile that need to show obtain in viewing area.
According to a further aspect in the invention, it is provided that a kind of method controlling electronic chart scaling, wherein, the method bag
Include: when receiving the instruction reducing map, determine the target display level narrowed down to, find out in target display level and need to show
The multiple target tile shown；Wherein, target display level is higher than currently displaying rank；Show according to currently displaying rank and target
Rank difference between rank loads and reduces the tile that display is currently displaying；Select prestrain display level, find out prestrain
The prestrain tile that in display level, marginal area need to load；Obtain prestrain tile and target tile according to priority, press
Load according to the rank difference between prestrain display level and target display level and amplify display prestrain tile；When getting mesh
After mark tile, load and show that described target tile is to replace the currently displaying tile reduced of correspondence position and the pre-of amplification
Load tile.
Alternatively, described prestrain display level is higher than target display level, the map represented by described prestrain tile
Scope includes in addition to the body of a map or chart represented by currently displaying tile by the map represented by the plurality of target tile
Scope, and n times that geographic areas is the geographic areas corresponding to each target tile corresponding to each prestrain tile, n=4k, k
For natural number, represent that the rank between prestrain display level and target display level is poor.
Alternatively, described load according to the rank difference between currently displaying rank and target display level and reduce display work as
The tile of front display, including: the transverse width of currently displaying tile and longitudinal direction are the most all reduced into 1/p and show, wherein, p
=2q, q is natural number, represents that the rank between target display level and currently displaying rank is poor；Described show according to prestrain
Rank difference between rank and target display level loads and amplifies display prestrain tile, including: by each prestrain tile
Transverse width and longitudinally the most all amplify m times and show, wherein, m=2k, k is natural number, represents prestrain display level and mesh
Rank between mark display level is poor.
Alternatively, the method also includes: arrange local cache；The tile shown is saved in local cache.
Alternatively, the method also includes: when being saved in local cache by the tile shown, if the appearance of local cache
Amount deficiency, then remove least-recently-used tile from local cache.
Alternatively, described obtain prestrain tile and target tile according to priority and specifically include: judge described pre-add
Whether load tile and target tile be in local cache, if being judged as YES, then reads prestrain tile and mesh from local cache
Mark tile, if being judged as NO, then downloads prestrain tile and target tile from server.
Alternatively, described loading and show described target tile with replace correspondence position the currently displaying tile reduced
Prestrain tile with amplifying, specifically includes: while loaded targets tile, increases the currently displaying tile reduced and puts
The transparency of big prestrain tile；When the operation of loaded targets tile completes, remove the currently displaying tile that reduces and
The prestrain tile amplified and display target tile.
Alternatively, described in find out target display level needs display multiple target tile, including: the most visual
The geographical position coordinates reducing central point in region and the target display level of map, conversion obtains reducing the pixel of central point and sits
Mark；Target display level according to the map, obtains the Pixel Dimensions of the single target tile that need to show；Viewing area according to the map
Pixel Dimensions and reduce the pixel coordinate of central point, obtain the pixel coordinate on two relative summits of map viewing area；
The pixel coordinate on two relative summits of viewing area obtains with the Pixel Dimensions of the single target tile that need to show according to the map
Target tile in viewing area.
The device controlling electronic chart scaling and the method for control electronic chart scaling according to the present invention can be by choosings
Select prestrain display level and loading and amplify display prestrain tile, showing fuzzy prestrain tile, Yi Jijia rapidly
Carry and reduce the currently displaying tile of display, thus solving prior art when reducing electronic chart, since it is desired that more
Time, so some tiles, the problem that can there is more blank in electronic map window can not be shown in time, reduces and reduces
Electronic map window exists during electronic chart the effect of the probability of blank.By prestrain tile being loaded and amplifying display mould
The prestrain tile stuck with paste, and after getting target tile, load and show that target tile is to replace reducing of correspondence position
Currently displaying tile and the prestrain tile of amplification, make the switching between map rank inconspicuous.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of description, and in order to allow above and other objects of the present invention, the feature and advantage can
Become apparent, below especially exemplified by the detailed description of the invention of the present invention.
Accompanying drawing explanation
By reading the detailed description of hereafter preferred implementation, various other advantage and benefit common for this area
Technical staff will be clear from understanding.Accompanying drawing is only used for illustrating the purpose of preferred implementation, and is not considered as the present invention
Restriction.And in whole accompanying drawing, it is denoted by the same reference numerals identical parts.In the accompanying drawings:
Fig. 1 shows the flow chart of the method controlling electronic chart scaling according to an embodiment of the invention；
Fig. 2 shows the detailed flow chart 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 controlling electronic chart scaling according to a first embodiment of the present invention；
Fig. 5 shows the block diagram of the device controlling electronic chart scaling according to a second embodiment of the present invention；And
Fig. 6 shows the schematic diagram of the electronic map client side realized according to the present invention.
Detailed description of the invention
It is more fully described the exemplary embodiment of the disclosure below with reference to accompanying drawings.Although accompanying drawing shows the disclosure
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure and should be by embodiments set forth here
Limited.On the contrary, it is provided that these embodiments are able to be best understood from the disclosure, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.
The present invention technology design essentially consist in, when receiving the instruction reducing map, determine target display level and
Prestrain display level, finds out marginal area in the target tile that need to show and prestrain display level (currently displaying
The body of a map or chart that tile periphery is newly-increased) the prestrain tile that need to load.Owing to the number of prestrain tile is than corresponding target watt
The number of sheet is few, and (body of a map or chart represented by such as one prestrain tile is equivalent to other four or 16 or more of lower level
Body of a map or chart represented by multiple target tile), so needed for being downloaded prestrain tile by server and loaded prestrain tile
The time that the time wanted compares required for use prior art is downloaded target tile and loaded targets tile by server is short, by inciting somebody to action
Prestrain tile loads and amplifies the prestrain tile that display is fuzzy, and after getting target tile, loads and show mesh
Mark tile is to replace the amplification prestrain tile of correspondence position, and when reducing map, electronic map window exists the general of blank
Rate.By prestrain tile loads and amplifies the fuzzy prestrain tile of display, load and reduce display currently displaying watt
Sheet, and after getting target tile, load and show target tile with replace correspondence position reduce currently displaying
The prestrain tile of tile and amplification, electronic chart shows as, by obscuring the process of clearly showing that, making between map rank
Switch inconspicuous.
It should be noted that the picture in electronic chart tile, i.e. grating map, these pictures are by certain rule, splicing
Become a complete electronic chart, electronic chart is reduced, the tile of higher level can be shown, the list of higher level in this area
The body of a map or chart represented by the more low-level single tile of body of a map or chart represented by individual tile is big, such as, in adjacent rank
One tile of higher level is equivalent to the body of a map or chart represented by four tiles of relatively low rank, and rank difference is two ranks of 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 controlling electronic chart scaling according to an embodiment of the invention.The method
Comprise the steps that S100 is to step S400:
S100, when receiving the instruction reducing map, determine the target display level narrowed down to, find out target and show
Rank needs multiple target tile of display；Wherein, target display level is higher than currently displaying rank.Wherein, art technology
Personnel it can be appreciated that, target display level be according to user input the instruction reducing map depending on, in other words, mesh
Mark display level be operated after the display level of electronic chart.Map is reduced by this area, higher level can be shown
Tile, it is big that the body of a map or chart represented by the tile of higher level compares the body of a map or chart represented by low level tile, therefore mesh
Mark display level is higher than current display level.The method searching target tile, can be with reference to method as shown in Figure 2, root
The geographical position coordinates of central point and target display level according to map viewing area calculate target tile.Show described target watt
Sheet can be reduced clearly after electronic chart.
S200, load according to the rank difference between currently displaying rank and target display level and reduce display currently displaying
Tile.
Specifically, load according to the rank difference between currently displaying rank and target display level and to reduce display current aobvious
The tile shown, including: the transverse width of currently displaying tile and longitudinal direction are the most all reduced into 1/p and show, wherein, p=2q,
Q is natural number, represents that the rank between target display level and currently displaying rank is poor.If target display level and currently displaying
Rank difference between rank is 1, then by the transverse width of currently displaying tile and be longitudinally the most all reduced into 1/2 display；If
Rank difference between target display level and currently displaying rank is 2, then by transverse width and the longitudinal direction of currently displaying tile
The most all being reduced into 1/4 display, the rest may be inferred.
In the present embodiment, by currently displaying tile is reduced display, it is possible to of the map after reducing rapidly
Subregion fuzzy display rapidly, the body of a map or chart of periphery by following step S300 and S400 rapidly with relatively low clear
Clear degree shows.
S300, selection prestrain display level, find out the prestrain that in prestrain display level, marginal area need to load
Tile.
In the present embodiment, prestrain display level is higher than target display level, the body of a map or chart represented by prestrain tile
Including in addition to the body of a map or chart represented by currently displaying tile by the body of a map or chart represented by the plurality of target tile,
The currently displaying tile institute table reduced in complete body of a map or chart removing step S200 shown in viewing area is needed after i.e. reducing
The body of a map or chart shown, the most above-mentioned " marginal area ", and the geographic areas corresponding to each prestrain tile are each target watt
N times of geographic areas corresponding to sheet, n=4k, k is natural number, represents between prestrain display level and target display level
Rank poor.
It is preferred that in the present embodiment, in order to represent the information on map all sidedly in more detail, the preservation of electronic chart uses
Classification tile mechanism, is divided into map multiple level to preserve, deposits corresponding grating map tile, with biphase under each level
As a example by tile under adjacent display level, four adjacent tiles under the display level that display level is low (i.e. 2 × 2 in " field "
Four adjacent tiles of font) correspond to a tile under the display level that display level is high；It is the two of two with rank difference
As a example by layer tile, 16 adjacent tiles (16 adjacent tiles of i.e. 4 × 4) under the display level that display level is low are right
Should be in a tile under the display level that display level is high.In the present embodiment, the method searching prestrain tile, Ke Yishi
With reference to method as shown in Figure 2, the geographical position coordinates reducing central point of viewing area and prestrain display level according to the map
Ji Suan prestrain tile, it is also possible to be to utilize the corresponding relation with target tile to be taken by division according to the numbering of target tile
Whole computing obtains the numbering of prestrain tile.In the present embodiment, due to the corresponding multiple target tile of each prestrain tile, so
Body of a map or chart represented by described prestrain tile is likely larger than the body of a map or chart represented by the plurality of target tile.
S400, obtain prestrain tile and target tile according to priority, show according to prestrain display level and target
Show that the rank difference between rank loads and amplifies display prestrain tile.By first showing fuzzy amplification prestrain tile,
Loading velocity is fast, reduces the probability showing blank tile on electronic chart.
In the present embodiment, load according to the rank difference between prestrain display level and target display level and amplify display
Prestrain tile, including: the transverse width of each prestrain tile and the most all amplifications m times are shown, wherein, m=2k,
K is natural number, represents that the rank between prestrain display level and target display level is poor.If that is, prestrain display level
With the rank difference between target display level is 1 transverse width by each prestrain tile and is longitudinally the most all enlarged into 2
Show again；If the rank difference between prestrain display level and target display level is 2, by each prestrain tile
Transverse width and be longitudinally the most all enlarged into 4 times and show.
S500, after getting target tile, load and show that described target tile is to replace reducing of correspondence position
The prestrain tile of currently displaying tile and amplification.By use target tile clearly replace correspondence position reduce work as
The tile of front display and the prestrain tile of amplification, it is achieved clear display map and map denotation clearly indicate by obscuring
Effect.
Summary step S100, S200, S300, S400 and S500, the present embodiment is by loading and reducing display currently
The tile of display, selecting prestrain display level and loading also to amplify display prestrain tile, it is fuzzy clear to show rapidly
Spend relatively low prestrain tile, reduce the probability of the blank tile of electronic chart display.
By performing step S300 and step S400 in the present embodiment, it is possible to select one high more pre-than target display level
Loaded and displayed rank and show the amplification prestrain tile in this prestrain display level.By being repeatedly carried out step S300
With step S400, it is also possible to select multiple prestrain display level higher than target display level and show that multiple prestrain shows
Show the amplification prestrain tile in rank, in being embodied as, can putting in the higher prestrain display level of first display level
Amplification prestrain tile in the prestrain display level that prestrain tile, then display level greatly is relatively low, realizes map equally and shows
Show and clearly indicate effect by obscuring.It addition, it will be understood by a person skilled in the art that, prestrain display level can also be current
Display level.
Further, the method also includes: arrange local cache；The tile shown is saved in local cache.More
Specifically, the present embodiment, by creating local cache, controls the request frequency of tile.When reducing map, it is possible to preferential display is
The tile of buffered mistake, reduces user and sees the probability of blank, and utilize caching can improve loading velocity, at server end
In the case of not adding caching head, also it is avoided that repetitive requests tile.Then the method for the present embodiment also includes: will show
Tile when being saved in local cache, if the off-capacity of local cache, then remove least recently used from local cache
Tile.In other words, the realization of caching uses LRU (Least Recently Used, least recently used) strategy, in caching
Tile exceed caching set capacity time, can preferentially eliminate least-recently-used tile.
It is preferred that the selection prestrain display level method for distinguishing in above-mentioned steps S300, it is to select ratio target display level
High several ranks, select prestrain display level from described each rank, specifically judge the pre-add in each rank described
Carrying tile in the buffer or to need to be downloaded by server, it is pre-for selecting the rank needing the tile number downloaded by server minimum
Loaded and displayed rank thus accelerate from server download prestrain tile speed, if further need downloaded by server
Tile number identical, then the rank that prioritizing selection is higher ranked is prestrain display level thus reduces the prestrain that need to process
The number of tile is with speed up processing further.
In the present embodiment, specifically wrapping according to priority acquisition prestrain tile and target tile of above-mentioned steps S400
Include: judge that prestrain tile and target tile, whether in local cache, if being judged as YES, then read pre-add from local cache
Carrying tile and target tile, if being judged as NO, then downloading prestrain tile and target tile from server.Delayed by preferential acquisition
Tile in depositing, it is possible to increase loading velocity.
Fig. 2 shows the detailed flow chart of step S100 as shown in Figure 1.Step S100 find out target display level
Need multiple target tile of display in not, specifically include following steps:
The geographical position coordinates reducing central point of S110, according to the map viewing area and the target display level of map,
Conversion obtains reducing the pixel coordinate of central point.
According to projection theory, two maps before and after amplification have the point of overlap represent identical geographical position, described in reduce
Central point is the point that the geographical position represented when reducing of map is constant.The present embodiment reduces central point, makes receiving
What user was inputted by mouse roller can be the position of mouse when reducing map instructions, or passes through page receiving user
What face button (such as "-" button) inputted can be the center of map when reducing map instructions.According to the geography reducing central point
Position coordinates (i.e. latitude and longitude coordinates) and target display level, it is possible to obtain reducing pixel coordinate (such as, the X-Y seat of central point
Mark).
S120, target display level according to the map, obtain the Pixel Dimensions of the single target tile that need to show.
Understanding from the above mentioned, the preservation of the present embodiment electronic chart uses classification tile mechanism, according to target display level,
The Pixel Dimensions of single target tile can be obtained.
The Pixel Dimensions of S130, according to the map viewing area and reduce the pixel coordinate of central point, obtains map visible area
The pixel coordinate on two relative summits in territory.
In the present embodiment, the position relationship on the summit reducing central point and map viewing area is knowable, according to target
Display level, it is possible to obtain map and reduce the Pixel Dimensions of rear viewing area, therefore can obtain map and reduce rear viewing area
The pixel coordinate on two relative summits.
Two relative summits of described map viewing area, it is possible to be left upper apex and bottom right vertex, or upper right top
By relative two summits, point and bottom left vertex, just can determine that map reduces the scope of rear viewing area.
The pixel coordinate on two relative summits of S140, according to the map viewing area and the single target tile that need to show
Pixel Dimensions obtain the target tile in viewing area.
Step S140 specifically includes: obtain horizontal index number and the longitudinal direction of the target tile at two relative places, summit
Index number；Choose horizontal index number between the horizontal index number of the target tile at two relative places, summit and
Longitudinal index number target tile between longitudinal index number of the target tile at two relative places, summit, to obtain final product
Target tile in map viewing area.Wherein, the horizontal rope of the target tile at two relative places, summit is obtained described in
Draw numbering and longitudinal index number, specifically include: the pixel coordinate that described summit is utilized respectively summit deducts the initial point of map
Pixel coordinate obtain the difference of abscissa and the difference of vertical coordinate, utilize the difference width divided by single target tile of abscissa
Degree obtains horizontal index number, utilizes the difference of vertical coordinate to obtain longitudinal index number divided by the height of single target tile.
Fig. 3 shows the detailed flow chart of step S500 as shown in Figure 1.The loading of step S500 also shows target watt
Sheet, to replace the prestrain tile of amplification of correspondence position, specifically includes following steps:
S510, while loaded targets tile, increase the currently displaying tile that reduces and the prestrain tile of amplification
Transparency.In other words, when loaded targets tile, by the prestrain tile of the currently displaying tile reduced and amplification gradually
Become transparent.
S520, when the operation of loaded targets tile completes, remove the currently displaying tile and the pre-add of amplification reduced
Carry tile and display target tile.Specifically, corresponding to a currently displaying tile reduced or a pre-add amplified
When several target tile of load tile have loaded, remove this currently displaying tile reduced or the prestrain tile of amplification,
Several target tile that display has loaded, make electronic chart apparent.
In the present embodiment, according to different browsers version, it is provided that the different mechanism that renders, improve and render tile performance, with
Ensure the loading in step S400 and amplify the loading in display prestrain tile operation and step S500 and show target tile
The fluency of operation.Such as, for the browser supporting webgl interface, it is provided that WebglRenderer renders mechanism；For propping up
Hold the browser of HTML5 label C anvas, it is provided that CanvasRenderer renders mechanism；For the browser of support CSS3, carry
Mechanism is rendered for CSSRenderer；For lowest version browsers such as IE6, IE7, IE8, it is provided that FlashRendere renders mechanism；
For all browsers, it is provided that DivRenderer renders mechanism.
Fig. 4 shows the block diagram of the device controlling electronic chart scaling according to a first embodiment of the present invention.This device bag
Include target tile arithmetic element 100, prestrain tile arithmetic element the 200, second loading unit 300 and the first loading unit 400.
Target tile arithmetic element 100, is suitable to when receiving the instruction reducing map, determines that the target narrowed down to shows
Rank, finds out the multiple target tile needing display in target display level；Wherein, target display level is than currently displaying rank
High.Wherein, those skilled in the art it can be appreciated that, target display level be according to user input the finger reducing map
Depending on order, in other words, target display level be operated after the display level of electronic chart.Specifically, this technology neck
Being reduced by map in territory, can show the tile of higher level, the body of a map or chart represented by the tile of higher level compares low level
Body of a map or chart represented by tile is big, and therefore target display level is higher than current display level.The method searching target tile,
Can be the method with reference to as shown in Figure 2, the geographical position coordinates of the central point of viewing area and target display level according to the map
Do not calculate target tile.Show described target tile can be reduced clearly after electronic chart.
First loading unit 400, is suitable to load also according to the rank difference between currently displaying rank and target display level
Reduce the tile that display is currently displaying.Specifically, the first loading unit 400 according to currently displaying rank and target display level it
Between rank difference load and reduce the currently displaying tile of display and include the transverse width of currently displaying tile and longitudinally high
Degree is all reduced into 1/p and shows, wherein, and p=2q, q is natural number, represents the level between target display level and currently displaying rank
The poorest.If the rank difference between target display level and currently displaying rank is 1, then by the transverse width of currently displaying tile
1/2 display the most all it is reduced into longitudinal；If the rank difference between target display level and currently displaying rank is 2, then ought
The transverse width of the tile of front display is the most all reduced into 1/4 display with longitudinal, and the rest may be inferred.In the present embodiment, by ought
The tile of front display reduces display, it is possible to a part of region of the map after reducing rapidly fuzzy display, periphery rapidly
Body of a map or chart by following prestrain tile arithmetic element 200 and the second loading unit 300 rapidly with relatively low clear
Degree shows.
Prestrain tile arithmetic element 200, is suitably selected for prestrain display level, finds out limit in prestrain display level
The prestrain tile that edge region need to load.In the present embodiment, prestrain tile arithmetic element 200, it is suitably selected for showing than target
The prestrain display level that rank is high, the body of a map or chart represented by prestrain tile includes except represented by currently displaying tile
Body of a map or chart outside by the body of a map or chart represented by the plurality of target tile, need after i.e. reducing to show in viewing area
The body of a map or chart represented by currently displaying tile reduced in complete body of a map or chart removing step S200, the most above-mentioned " limit
Edge region ", and n times that geographic areas is the geographic areas corresponding to each target tile corresponding to each prestrain tile, n=
4k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
Second loading unit 300, is suitable to obtain prestrain tile and target tile according to priority, shows according to prestrain
Show that the rank difference between rank and target display level loads and amplifies display prestrain tile；After getting target tile,
Load and show that described target tile is to replace the currently displaying tile reduced and the prestrain tile of amplification of correspondence position.
By first showing fuzzy amplification prestrain tile, loading velocity is fast, reduces and shows blank tile on electronic chart
Probability.By using target tile clearly to replace the currently displaying tile reduced and the prestrain watt of amplification of correspondence position
Sheet, it is achieved clear display map and map denotation clearly indicate effect by obscuring.
In the present embodiment, the second loading unit 300, be suitable to the transverse width of each prestrain tile with the most equal
Amplify m times to show, wherein, m=2k, k is natural number, represents the rank between prestrain display level and target display level
Difference.That is, if the rank difference between prestrain display level and target display level is 1, horizontal by each prestrain tile
Width and longitudinal direction are the most all enlarged into 2 times and show；If the rank between prestrain display level and target display level
Difference is 2 transverse widths by each prestrain tile and is longitudinally the most all enlarged into 4 times and shows.
In the present embodiment, the second loading unit 300, while loaded targets tile, it is currently displaying that increase is reduced
The transparency of the prestrain tile of tile and amplification, in other words, the second loading unit 300, when loaded targets tile, will reduce
Currently displaying tile and the prestrain tile of amplification gradually become transparent.Further, when the operation of loaded targets tile
When completing, the second loading unit 300 removes prestrain tile and the display target of currently displaying tile and the amplification reduced
Tile.Specifically, corresponding to a currently displaying tile reduced or several targets watt of a prestrain tile amplified
When sheet has loaded, the second loading unit 300 removes this currently displaying tile reduced or the prestrain tile of amplification, display
The several target tile loaded, make electronic chart apparent.
In the present embodiment, target tile arithmetic element 100, be suitable to the geography reducing central point of viewing area according to the map
The target display level of position coordinates and map, conversion obtains reducing the pixel coordinate of central point；Target according to the map shows
Rank, obtains the Pixel Dimensions of the single target tile that need to show；The Pixel Dimensions of viewing area and reduce center according to the map
The pixel coordinate of point, obtains the pixel coordinate on two relative summits of map viewing area；The two of viewing area according to the map
The target watt that the pixel coordinate on individual relative summit and the Pixel Dimensions of single target tile that need to show obtain in viewing area
Sheet.
In the present embodiment, the pixel on two relative summits of target tile arithmetic element 100 viewing area according to the map
The method that coordinate and the Pixel Dimensions of single target tile that need to show obtain the target tile in viewing area, particular by
Obtain the horizontal index number of the target tile at two relative places, summit and longitudinal index number；And choose laterally index
Numbering is between the horizontal index number of the target tile at two relative places, summit and longitudinal index number is positioned at two
Target tile between longitudinal index number of the target tile at relative place, summit, thus obtain in map viewing area
Target tile.
Wherein, target tile arithmetic element 100, deduct map by described summit being utilized respectively the pixel coordinate on summit
The pixel coordinate of initial point obtain the difference of abscissa and the difference of vertical coordinate, utilize the difference of abscissa divided by single target watt
The width of sheet obtains horizontal index number, utilizes the difference of vertical coordinate to obtain longitudinally indexing volume divided by the height of single target tile
Number.
Fig. 5 shows the block diagram of the device controlling electronic chart scaling according to a second embodiment of the present invention.The present embodiment
In similar to first embodiment as shown in Figure 4, difference is, this device also includes: buffer unit 500.
Buffer unit 500, is suitable to arrange local cache, and is saved in local cache by the tile shown.More
Body ground, the present embodiment creates local cache by buffer unit 500, controls the request frequency of tile.When reducing map, it is possible to excellent
First show the tile being cached, reduce user and see the probability of blank, and utilize buffer unit 500 can improve loading
Speed, in the case of server end does not add caching head, is also avoided that repetitive requests tile.
Further, when the tile shown is saved in local cache by buffer unit 500, if the appearance of local cache
Amount deficiency, then buffer unit 500 removes least-recently-used tile from local cache.Specifically, buffer unit 500 uses
LRU (Least Recently Used, least recently used) strategy, when tile in the buffer exceedes the capacity that caching sets,
Can preferentially eliminate least-recently-used tile.
Further, second loading unit 300 of the present embodiment, be suitable to judge that described prestrain tile and target tile are
No in local cache, if being judged as YES, then from local cache, read prestrain tile and target tile, if being judged as NO,
Then download prestrain tile and target tile from server.By the preferential tile obtained in caching, it is possible to increase loading velocity.
Fig. 6 shows the schematic diagram of the electronic map client side realized according to the present invention.Contract by controlling electronic chart
The device put and the method controlling electronic chart scaling, electronic map client side carries out reduction operation in the instruction according to user
Time, it is little to there is blank probability in electronic map window, and electronic chart shows by obscuring the process of clearly showing that, makes map level
Switching between Bie is inconspicuous.
It should be understood that
Algorithm and display are not intrinsic to any certain computer, virtual system or miscellaneous equipment relevant provided herein.
Various general-purpose systems can also be used together with based on teaching in this.As described above, construct required by this kind of system
Structure be apparent from.Additionally, the present invention is also not for any certain programmed language.It is understood that, it is possible to use various
Programming language realizes the content of invention described herein, and the description done language-specific above is to disclose this
Bright preferred forms.
In description mentioned herein, illustrate a large amount of detail.It is to be appreciated, however, that the enforcement of the present invention
Example can be put into practice in the case of not having these details.In some instances, it is not shown specifically known method, structure
And technology, in order to do not obscure the understanding of this description.
Similarly, it will be appreciated that one or more in order to simplify that the disclosure helping understands in each inventive aspect, exist
Above in the description of the exemplary embodiment of the present invention, each feature of the present invention is grouped together into single enforcement sometimes
In example, figure or descriptions thereof.But, the method for the disclosure should not be construed to reflect an intention that i.e. required guarantor
The application claims feature more more than the feature being expressly recited in each claim protected.More precisely, as following
Claims reflected as, inventive aspect is all features less than single embodiment disclosed above.Therefore,
The claims following detailed description of the invention are thus expressly incorporated in this detailed description of the invention, the most each claim itself
All as the independent embodiment of the present invention.
Those skilled in the art are appreciated that and can carry out the module in the equipment in embodiment adaptively
Change and they are arranged in one or more equipment different from this embodiment.Can be the module in embodiment or list
Unit or assembly are combined into a module or unit or assembly, and can put them in addition multiple submodule or subelement or
Sub-component.In addition at least some in such feature and/or process or unit excludes each other, can use any
Combine all features disclosed in this specification (including adjoint claim, summary and accompanying drawing) and so disclosed appoint
Where method or all processes of equipment or unit are combined.Unless expressly stated otherwise, this specification (includes adjoint power
Profit requires, summary and accompanying drawing) disclosed in each feature can be carried out generation by providing identical, equivalent or the alternative features of similar purpose
Replace.
Although additionally, it will be appreciated by those of skill in the art that embodiments more described herein include other embodiments
Some feature included by rather than further feature, but the combination of the feature of different embodiment means to be in the present invention's
Within the scope of and form different embodiments.Such as, in the following claims, embodiment required for protection appoint
One of meaning can mode use in any combination.
The all parts embodiment of the present invention can realize with hardware, or to run on one or more processor
Software module realize, or with combinations thereof realize.It will be understood by those of skill in the art that and can use in practice
Microprocessor or digital signal processor (DSP) realize the equipment controlling electronic chart scaling according to embodiments of the present invention
In the some or all functions of some or all parts.The present invention is also implemented as performing as described herein
Part or all equipment of method or device program (such as, computer program and computer program).So
The program realizing the present invention can store on a computer-readable medium, or can have the shape of one or more signal
Formula.Such signal can be downloaded from internet website and obtain, or provides on carrier signal, or with any other shape
Formula provides.
The present invention will be described rather than limits the invention to it should be noted 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 marks that should not will be located between bracket is configured to limitations on claims.Word " comprises " and does not excludes the presence of not
Arrange element in the claims or step.Word "a" or "an" before being positioned at element does not excludes the presence of multiple such
Element.The present invention and can come real by means of including the hardware of some different elements by means of properly programmed computer
Existing.If in the unit claim listing equipment for drying, several in these devices can be by same hardware branch
Specifically embody.Word first, second and third use do not indicate that any order.These word explanations can be run after fame
Claim.
Claims (10)
1. controlling a device for electronic chart scaling, this device includes:
Target tile arithmetic element, is suitable to when receiving the instruction reducing map, determines the target display level narrowed down to, looks into
Find out the multiple target tile needing display in target display level；Wherein, target display level is higher than currently displaying rank；
First loading unit, is suitable to load according to the rank difference between currently displaying rank and target display level and reduce display
Currently displaying tile；
Prestrain tile arithmetic element, is suitably selected for prestrain display level, finds out marginal area in prestrain display level
The prestrain tile that need to load；
Second loading unit, is suitable to obtain prestrain tile and target tile, according to prestrain display level according to priority
With the rank difference between target display level loads and amplifies display prestrain tile；After getting target tile, load also
Show that described target tile is to replace the currently displaying tile reduced and the prestrain tile of amplification of correspondence position.
Device the most according to claim 1, wherein,
Described prestrain tile arithmetic element, is suitably selected for the prestrain display level higher than target display level, described pre-add
Carry the body of a map or chart represented by tile to include in addition to the body of a map or chart represented by currently displaying tile by the plurality of mesh
Mark the body of a map or chart represented by tile, and the geographic areas corresponding to each prestrain tile is the geography corresponding to each target tile
N times of area, n=4k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
Device the most according to claim 1 and 2, wherein,
Described first loading unit, is suitable to the transverse width of currently displaying tile and longitudinal direction are the most all reduced into 1/p and are shown,
Wherein, p=2q, q is natural number, represents that the rank between target display level and currently displaying rank is poor；
Described second loading unit, is suitable to show the transverse width of each prestrain tile and the most all amplifications m times, its
In, m=2k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
4. according to the device described in claim 1-3 any claim, wherein,
This device also includes: buffer unit, is suitable to arrange local cache, and the tile shown is saved in local cache
In.
5. according to the device described in claim 1-4 any claim, wherein,
When the tile shown is saved in local cache by described buffer unit, if the off-capacity of local cache, then institute
State buffer unit from local cache, remove least-recently-used tile.
6. according to the device described in claim 1-5 any claim, wherein,
Described second loading unit, be suitable to judge described prestrain tile and target tile whether in local cache, if judging
It is yes, then from local cache, reading prestrain tile and target tile, if being judged as NO, then downloading prestrain watt from server
Sheet and target tile.
7. according to the device described in claim 1-6 any claim, wherein,
Described second loading unit, while loaded targets tile, increases the pre-of the currently displaying tile that reduces and amplification
Load the transparency of tile；When the operation of loaded targets tile completes, remove the currently displaying tile reduced and amplification
Prestrain tile and display target tile.
8. according to the device described in claim 1-7 any claim, wherein,
Described target tile arithmetic element, is suitable to the geographical position coordinates reducing central point and the map of viewing area according to the map
Target display level, conversion obtain reducing the pixel coordinate of central point；Target display level according to the map, obtains needing display
The Pixel Dimensions of single target tile；The Pixel Dimensions of viewing area and reduce the pixel coordinate of central point according to the map,
Pixel coordinate to two relative summits of map viewing area；The picture on two relative summits of viewing area according to the map
The target tile that element coordinate and the Pixel Dimensions of single target tile that need to show obtain in viewing area.
9. the method controlling electronic chart scaling, wherein, the method includes:
When receiving the instruction reducing map, determine the target display level narrowed down to, find out in target display level and need
Multiple target tile of display；Wherein, target display level is higher than currently displaying rank；
Load according to the rank difference between currently displaying rank and target display level and reduce the tile that display is currently displaying；
Select prestrain display level, find out the prestrain tile that in prestrain display level, marginal area need to load；
Prestrain tile and target tile is obtained, according between prestrain display level and target display level according to priority
Rank difference load and amplify display prestrain tile；
After getting target tile, load and show described target tile with replace correspondence position reduce currently displaying
The prestrain tile of tile and amplification.
Method the most according to claim 9, wherein,
Described prestrain display level is higher than target display level, the body of a map or chart represented by described prestrain tile include except
By the body of a map or chart represented by the plurality of target tile outside the currently displaying body of a map or chart represented by tile, and each pre-add
Carry n times that geographic areas is the geographic areas corresponding to each target tile corresponding to tile, n=4k, k is natural number, represents
Rank between prestrain display level and target display level is poor.
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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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Also Published As
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| CN106126527B (en) | 2018-09-18 |
| CN103700126A (en) | 2014-04-02 |
| CN103700126B (en) | 2016-08-17 |
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