CN103700126A - Device and corresponding method for controlling electronic map zooming - Google Patents
Device and corresponding method for controlling electronic map zooming Download PDFInfo
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- CN103700126A CN103700126A CN201310746249.2A CN201310746249A CN103700126A CN 103700126 A CN103700126 A CN 103700126A CN 201310746249 A CN201310746249 A CN 201310746249A CN 103700126 A CN103700126 A CN 103700126A
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Abstract
The invention discloses a device and a corresponding method for controlling electronic map zooming. The method comprises the following steps of: when a command for enlarging a map is received, determining a target display level to which the map needs to be enlarged, and looking up a plurality of target tiles which need to be displayed at the target display level, wherein the target display level is higher than the current display level; according to the level difference between the current display level and the target display level, loading and zooming out to display the tile which is displayed at present; selecting a preloading display level, and looking up a preloading tile which needs to be loaded in an edge area at the preloading display level; according to the priority, obtaining the preloading tile and the target tile; according to the level difference between the preloading display level and the target display level, loading and zooming in to display the preloading tile; when the target tile is obtained, loading and displaying the target tile to replace the enlarged preloading tile on the corresponding position.
Description
Technical field
The present invention relates to electronic map technique field, be specifically related to a kind of method of controlling the device of electronic chart convergent-divergent and controlling electronic chart convergent-divergent.
Background technology
Current electronic chart client, (consult Baidu's map dwindling map according to user's the instruction of dwindling map, the electronic chart networking clients such as Tengxun's map, i.e. "-" button of button is dwindled in click, in known electronic map technique field, dwindle the body of a map or chart that cartographic representation shows in identical electronic chart indication range large, geographical details is more rough) time, need to load the tile of the higher level different from current display level, because needs carry out the processing such as image rendering to server request tile and to tile, so when dwindling electronic chart, so because need the more time can not show in time some tiles, in electronic map window, can exist blank, when network performance is not good, the blank of electronic chart is more obvious.And the switching between electronic chart rank is very obvious.
Summary of the invention
In view of the above problems, the present invention has been proposed to a kind of a kind of device and corresponding method of controlling electronic chart convergent-divergent of controlling electronic chart convergent-divergent that overcomes the problems referred to above or address the above problem is at least in part provided.
According to one aspect of the present invention, a kind of device of controlling electronic chart convergent-divergent is provided, this device comprises:
Target tile arithmetic element, is suitable for when receiving the instruction of dwindling map, determines the target display level narrowing down to, and finds out a plurality of target tile that need demonstration in target display level; Wherein, target display level is higher than current display level; The first loading unit, is suitable for according to the poor loading of rank between current display level and target display level and dwindles the tile that shows current demonstration; Prestrain tile arithmetic element, is suitable for selecting prestrain display level, finds out the prestrain tile that in prestrain display level, fringe region need load; The second loading unit, is suitable for obtaining prestrain tile and target tile according to priority, according to the poor loading of rank between prestrain display level and target display level amplification, shows prestrain tile; After getting target tile, load and show that described target tile is to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position.
Alternatively, described prestrain tile arithmetic element, be suitable for selecting the prestrain display level higher than target display level, the represented body of a map or chart of described prestrain tile comprise except when outside the represented body of a map or chart of the tile of front demonstration by the represented body of a map or chart of described a plurality of target tile, and the corresponding geographic areas of each prestrain tile is n times of the corresponding geographic areas of each target tile, n=4
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
Alternatively, described the first loading unit, is suitable for the transverse width of the tile of current demonstration and is longitudinally highly all reduced into 1/p showing, wherein, and p=2
q, q is natural number, represents that the rank between target display level and current display level is poor; Described the second loading unit, is suitable for the transverse width of each prestrain tile and longitudinally highly all amplifies m doubly showing, wherein, and m=2
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
Alternatively, this device also comprises: buffer unit, is suitable for arranging local cache, and the tile having shown is kept in local cache.
Alternatively, in the time of in described buffer unit is kept at local cache by the tile having shown, if the off-capacity of local cache, described buffer unit removes least-recently-used tile from local cache.
Alternatively, described the second loading unit, is suitable for judging that described prestrain tile and target tile are whether in local cache, if be judged as YES, from local cache, read prestrain tile and target tile, if be judged as NO, from server, download prestrain tile and target tile.
Alternatively, described the second loading unit, in loaded targets tile, the tile of current demonstration that increase is dwindled and the transparency of the prestrain tile of amplification; When the operation of loaded targets tile completes, remove the tile of the current demonstration of dwindling and the prestrain tile of amplification and display-object tile.
Alternatively, described target tile arithmetic element, is suitable for the geographical position coordinates of dwindling central point of viewing area and the target display level of map according to the map, converts and obtains dwindling the pixel coordinate of central point; Target display level according to the map, obtains the Pixel Dimensions of the single target tile that need to show; The Pixel Dimensions of viewing area and dwindle the pixel coordinate of central point, obtains the pixel coordinate on two relative summits of map viewing area according to the map; The pixel coordinate on two of viewing area relative summits obtains the target tile in viewing area with the Pixel Dimensions of the single target tile that needs to show according to the map.
According to a further aspect in the invention, a kind of method of controlling electronic chart convergent-divergent is provided, and wherein, the method comprises: when receiving the instruction of dwindling map, determine the target display level narrowing down to, find out a plurality of target tile that need demonstration in target display level; Wherein, target display level is higher than current display level; According to the poor loading of rank between current display level and target display level and dwindle the tile that shows current demonstration; Select prestrain display level, find out the prestrain tile that in prestrain display level, fringe region need load; According to priority, obtain prestrain tile and target tile, according to the poor loading of rank between prestrain display level and target display level amplification, show prestrain tile; After getting target tile, load and show that described target tile is to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position.
Alternatively, described prestrain display level is higher than target display level, the represented body of a map or chart of described prestrain tile comprise except when outside the represented body of a map or chart of the tile of front demonstration by the represented body of a map or chart of described a plurality of target tile, and the corresponding geographic areas of each prestrain tile is n times of the corresponding geographic areas of each target tile, n=4
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
Alternatively, described according to the poor loading of rank between current display level and target display level and dwindle the tile that shows current demonstration, comprising: by the transverse width of the tile of current demonstration be longitudinally highly all reduced into 1/p demonstration, wherein, p=2
q, q is natural number, represents that the rank between target display level and current display level is poor; Described according to the poor loading of rank between prestrain display level and target display level and amplify to show prestrain tile, comprising: by the transverse width of each prestrain tile with longitudinally highly all amplify m and doubly show, wherein, m=2
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
Alternatively, the method also comprises: local cache is set; The tile having shown is kept in local cache.
Alternatively, the method also comprises: in the time of in the tile having shown is kept to local cache, if the off-capacity of local cache removes least-recently-used tile from local cache.
Alternatively, describedly according to priority, obtain prestrain tile and target tile specifically comprises: judge that described prestrain tile and target tile are whether in local cache, if be judged as YES, from local cache, read prestrain tile and target tile, if be judged as NO, from server, download prestrain tile and target tile.
Alternatively, described loading also shows that described target tile is to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position, specifically comprise: in loaded targets tile, the tile of current demonstration that increase is dwindled and the transparency of the prestrain tile of amplification; When the operation of loaded targets tile completes, remove the tile of the current demonstration of dwindling and the prestrain tile of amplification and display-object tile.
Alternatively, described in find out and in target display level, need a plurality of target tile of showing, comprising: the geographical position coordinates of dwindling central point of viewing area and the target display level of map according to the map, convert and obtain dwindling the pixel coordinate of central point; Target display level according to the map, obtains the Pixel Dimensions of the single target tile that need to show; The Pixel Dimensions of viewing area and dwindle the pixel coordinate of central point, obtains the pixel coordinate on two relative summits of map viewing area according to the map; The pixel coordinate on two of viewing area relative summits obtains the target tile in viewing area with the Pixel Dimensions of the single target tile that needs to show according to the map.
Can be by selecting prestrain display level and loading and amplify to show prestrain tile according to the method for the device of control electronic chart convergent-divergent of the present invention and control electronic chart convergent-divergent, show rapidly fuzzy prestrain tile, and the tile that loads and dwindle the current demonstration of demonstration, solved thus prior art when dwindling electronic chart, so because need the more time can not show in time some tiles, in electronic map window, can there is the problem of more blank, reach the effect that has blank probability while reducing electronic chart in electronic map window.By prestrain tile being loaded and amplifying, show fuzzy prestrain tile, and after getting target tile, loading also display-object tile, to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position, makes the switching between map rank not obvious.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, and for above and other objects of the present invention, feature and advantage can be become apparent, below especially exemplified by the specific embodiment of the present invention.
Accompanying drawing explanation
By reading below detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing is only for the object of preferred implementation is shown, and do not think limitation of the present invention.And in whole accompanying drawing, by identical reference symbol, represent identical parts.In the accompanying drawings:
Fig. 1 shows the process flow diagram of the method for controlling according to an embodiment of the invention electronic chart convergent-divergent;
Fig. 2 shows the detailed process flow diagram of step S100 as shown in Figure 1;
Fig. 3 shows the detailed process flow diagram of step S500 as shown in Figure 1;
Fig. 4 shows according to the block diagram of the device of the control electronic chart convergent-divergent of first embodiment of the invention;
Fig. 5 shows according to the block diagram of the device of the control electronic chart convergent-divergent of second embodiment of the invention; And
Fig. 6 shows according to the present invention and the schematic diagram of the electronic chart client that realizes.
Embodiment
Exemplary embodiment of the present disclosure is described below with reference to accompanying drawings in more detail.Although shown exemplary embodiment of the present disclosure in accompanying drawing, yet should be appreciated that and can realize the disclosure and the embodiment that should do not set forth limits here with various forms.On the contrary, it is in order more thoroughly to understand the disclosure that these embodiment are provided, and can by the scope of the present disclosure complete convey to those skilled in the art.
Technical conceive of the present invention is mainly, when receiving the instruction of dwindling map, determine target display level and prestrain display level, find out and need fringe region (the newly-increased body of a map or chart of tile periphery of current demonstration) in the target tile of demonstration and prestrain display level to need the prestrain tile loading.Because the number of prestrain tile for example, than the number of corresponding target tile few (represented body of a map or chart of prestrain tile is equivalent to more low-level four or 16 or the represented body of a map or chart of multiple target tile more), so downloaded by server, prestrain tile is downloaded target tile than use prior art by server with the loading prestrain needed time of tile and the needed time of loaded targets tile is short, by prestrain tile being loaded and amplifying, show fuzzy prestrain tile, and after getting target tile, loading display-object tile are to replace the amplification prestrain tile of correspondence position, while reducing map there is blank probability in electronic map window.By prestrain tile being loaded and amplifying, show fuzzy prestrain tile, load and dwindle the tile that shows current demonstration, and after getting target tile, loading display-object tile are to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position, electronic chart shows as by fuzzy to procedure for displaying clearly, makes the switching between map rank not obvious.
It should be noted that, electronic chart tile, it is the picture in grating map, these pictures are by certain rule, be spliced into a complete electronic chart, electronic chart is dwindled, the tile that can show higher level, in this area, the represented body of a map or chart of the represented more low-level single tile of body of a map or chart of the single tile of higher level is large, for example, in adjacent rank, higher level tile is equivalent to compared with four represented body of a map or charts of tile of low level, rank is poor is in two ranks of two, a tile of higher level is equivalent to compared with 16 represented body of a map or charts of tile of low level.
Fig. 1 shows the process flow diagram of the method for controlling according to an embodiment of the invention electronic chart convergent-divergent.The method comprises the steps that S100 is to step S400:
S100, when receiving the instruction of dwindling map, determine the target display level narrow down to, find out and in target display level, need a plurality of target tile of showing; Wherein, target display level is higher than current display level.Wherein, those skilled in the art can be appreciated that, target display level be according to the instruction of dwindling map of user's input and fixed, in other words, target display level is operate the display level of electronic chart afterwards.In this area, map is dwindled, can show the tile of higher level, it is large that the represented body of a map or chart of tile of higher level compares the represented body of a map or chart of low level tile, so target display level is higher than current display level.Searching the method for target tile, can be reference method as shown in Figure 2, and the geographical position coordinates of the central point of viewing area and target display level are calculated target tile according to the map.Show that described target tile can access the electronic chart after dwindling clearly.
S200, according to the poor loading of rank between current display level and target display level and dwindle the tile that shows current demonstration.
Particularly, according to the poor loading of rank between current display level and target display level and dwindle the tile that shows current demonstration, comprising: by the transverse width of the tile of current demonstration be longitudinally highly all reduced into 1/p demonstration, wherein, p=2
q, q is natural number, represents that the rank between target display level and current display level is poor.If the rank between target display level and current display level is poor is 1, by the transverse width of the tile of current demonstration be longitudinally highly all reduced into 1/2 demonstration; If the rank between target display level and current display level is poor is 2, by the transverse width of the tile of current demonstration be longitudinally highly all reduced into 1/4 demonstration, the rest may be inferred.
In the present embodiment, by the tile of current demonstration is dwindled to demonstration, can be rapidly by the fuzzy demonstration rapidly of a part of region of the map after dwindling, the body of a map or chart of periphery shows with lower sharpness rapidly by following step S300 and S400.
S300, selection prestrain display level, find out the prestrain tile that in prestrain display level, fringe region need load.
In the present embodiment, prestrain display level is higher than target display level, the represented body of a map or chart of prestrain tile comprise except when outside the represented body of a map or chart of the tile of front demonstration by the represented body of a map or chart of described a plurality of target tile, the represented body of a map or chart of current demonstration tile that the complete body of a map or chart that need to show in viewing area after dwindling is dwindled in removing step S200, above-mentioned " fringe region " namely, and the corresponding geographic areas of each prestrain tile is n times of the corresponding geographic areas of each target tile, n=4
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
Preferably, in the present embodiment, in order to represent all sidedly more in detail the information on map, the preservation of electronic chart adopts classification tile mechanism, map is divided into a plurality of levels to be preserved, under each level, deposit corresponding grating map tile, the tile of take under two adjacent display levels is example, and four adjacent tiles (i.e. four adjacent tiles that are sphere of movements for the elephants shape of 2 * 2) under the low display level of display level are corresponding to a tile under the high display level of display level; The poor two layers of tiles as two of the rank of take is example, and 16 adjacent tiles (i.e. 4 * 4 16 adjacent tiles) under the low display level of display level are corresponding to a tile under the high display level of display level.In the present embodiment, search the method for prestrain tile, it can be reference method as shown in Figure 2, the geographical position coordinates of dwindling central point of viewing area and prestrain display level are calculated prestrain tile according to the map, can be also to utilize with the corresponding relation of target tile according to the numbering of target tile, by division rounding operation, to obtain the numbering of prestrain tile.In the present embodiment, due to the corresponding a plurality of target tile of each prestrain tile, so the represented body of a map or chart of described prestrain tile may be greater than the represented body of a map or chart of described a plurality of target tile.
S400, according to priority, obtain prestrain tile and target tile, according to the poor loading of rank between prestrain display level and target display level and amplify and show prestrain tile.By first showing fuzzy amplification prestrain tile, loading velocity is fast, has reduced to show the probability of blank tile on electronic chart.
In the present embodiment, according to the poor loading of rank between prestrain display level and target display level and amplify to show prestrain tile, comprising: by the transverse width of each prestrain tile with longitudinally highly all amplify m and doubly show, wherein, m=2
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.That is, if the rank between prestrain display level and target display level poor be 1; by the transverse width of each prestrain tile be longitudinally highly all enlarged into 2 times and show; If the rank between prestrain display level and target display level is poor is 2, by the transverse width of each prestrain tile be longitudinally highly all enlarged into 4 times and show.
S500, after getting target tile, load and show that described target tile is to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position.By using target tile clearly to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position, realize clear demonstration map and map and show by fuzzy to display effect clearly.
Comprehensive above-mentioned steps S100, S200, S300, S400 and S500, the present embodiment shows tile, selection prestrain display level and the loading of current demonstration and amplifies demonstration prestrain tile by loading and dwindling, show rapidly the prestrain tile that fuzzy sharpness is lower, reduced the probability that electronic chart shows blank tile.
In the present embodiment, by execution step S300 and step S400, can select one than the high prestrain display level of target display level and show the amplification prestrain tile in this prestrain display level.By repeatedly performing step S300 and step S400, also can select a plurality of than the high prestrain display level of target display level and show the amplification prestrain tile in a plurality of prestrain display levels, in concrete enforcement, amplification prestrain tile in can first display level higher prestrain display level, amplification prestrain tile in the prestrain display level that display level is lower again, realizes equally map and shows by fuzzy to display effect clearly.In addition, it will be understood by a person skilled in the art that, prestrain display level can be also current display level.
Further, the method also comprises: local cache is set; The tile having shown is kept in local cache.More specifically, the present embodiment, by creating local cache, is controlled the request frequency of tile.While dwindling map, can preferentially show the tile that buffer memory is crossed, reduce user and see blank probability, and utilize buffer memory can improve loading velocity, in the situation that server end does not add buffer memory head, also can avoid repetitive requests tile.The method of the present embodiment also comprises: in the time of in the tile having shown is kept to local cache, if the off-capacity of local cache removes least-recently-used tile from local cache.In other words, the realization of buffer memory adopts LRU(Least Recently Used, least recently used) strategy, when the tile in buffer memory surpasses the capacity of buffer memory setting, can preferentially eliminate least-recently-used tile.
Preferably, selection prestrain display level method for distinguishing in above-mentioned steps S300, to select the several ranks higher than target display level, from described each rank, select prestrain display level, specifically the prestrain tile in described each rank of judgement is in buffer memory or need to be downloaded by server, thereby the rank of the tile number minimum that selection need to be downloaded by server is the speed that prestrain display level accelerates to download from server prestrain tile, if the tile number that need to be downloaded by server is further identical, preferentially selecting higher grade rank is thereby that prestrain display level reduces and needs the number of the prestrain tile processed with speed up processing further.
In the present embodiment, above-mentioned steps S400 obtains prestrain tile and target tile specifically comprises according to priority: judge that prestrain tile and target tile are whether in local cache, if be judged as YES, from local cache, read prestrain tile and target tile, if be judged as NO, from server, download prestrain tile and target tile.By preferentially obtaining the tile in buffer memory, can improve loading velocity.
Fig. 2 shows the detailed process flow diagram of step S100 as shown in Figure 1.The finding out of step S100 needs a plurality of target tile that show in target display level, specifically comprise the following steps:
S110, the geographical position coordinates of dwindling central point of viewing area and the target display level of map according to the map, convert and obtain dwindling the pixel coordinate of central point.
According to projection theory, in two maps before and after amplifying, have overlapping point to represent identical geographic position, described in to dwindle central point be map represented constant point in geographic position while dwindling.In the present embodiment, dwindle central point, receive that user inputs by mouse roller dwindle map instruction time can be the position of mouse, or receive user by page button (as "-" number button) input dwindle map instruction time can be the center of map.According to geographical position coordinates (being latitude and longitude coordinates) and the target display level of dwindling central point, can access the pixel coordinate (for example, X-Y coordinate) that dwindles central point.
S120, target display level according to the map, obtain the Pixel Dimensions of the single target tile that need to show.
Known from the above mentioned, the preservation of the present embodiment electronic chart adopts classification tile mechanism, according to target display level, can access the Pixel Dimensions of single target tile.
S130, according to the map viewing area Pixel Dimensions and dwindle the pixel coordinate of central point, obtain the pixel coordinate on two relative summits of map viewing area.
In the present embodiment, the position relationship that dwindles the summit of central point and map viewing area is known, according to target display level, can access the Pixel Dimensions that map dwindles rear viewing area, therefore can obtain the pixel coordinate that map dwindles two relative summits of rear viewing area.
Two relative summits of described map viewing area, can be left upper apex and summit, bottom right, or summit, upper right and summit, lower-left, by relative two summits, just can determine that map dwindles the scope of rear viewing area.
S140, the pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of the single target tile that need to show obtain the target tile in viewing area according to the map.
Step S140 specifically comprises: the horizontal index number and the longitudinal index number that obtain the target tile at two relative places, summit; Choose horizontal index number between the horizontal index number of the target tile at two relative places, summit and the longitudinal target tile of index number between longitudinal index number of the target tile at two relative places, summit, obtain the target tile in map viewing area.Wherein, described horizontal index number and the longitudinal index number that obtains the target tile at two relative places, summit, specifically comprise: the pixel coordinate that utilizes respectively the pixel coordinate on summit to deduct the initial point of map to described summit obtains the difference of horizontal ordinate and the difference of ordinate, the difference of utilizing horizontal ordinate obtains horizontal index number divided by the width of single target tile, and the difference of utilizing ordinate obtains longitudinal index number divided by the height of single target tile.
Fig. 3 shows the detailed process flow diagram of step S500 as shown in Figure 1.The loading of step S500 display-object tile, to replace the prestrain tile of the amplification of correspondence position, specifically comprise the following steps:
S510, in loaded targets tile, increase the tile of current demonstration dwindle and the transparency of the prestrain tile of amplification.In other words, when loaded targets tile, the prestrain tile of the tile of the current demonstration of dwindling and amplification is become to transparent gradually.
S520, when the operation of loaded targets tile completes, remove the tile of the current demonstration of dwindling and the prestrain tile of amplification and display-object tile.Particularly, while having loaded corresponding to several target tile of the tile of a current demonstration of dwindling or the prestrain tile of an amplification, remove the tile of this current demonstration of dwindling or the prestrain tile of amplification, show the several target tile that loaded, make electronic chart more clear.
In the present embodiment, according to different browsers version, provide the different mechanism of playing up, improve and play up tile performance, to guarantee loading the loading in amplification demonstration prestrain tile operation and step S500 the fluency of display-object tile operation in step S400.For example, the browser for supporting webgl interface, provides WebglRenderer to play up mechanism; Browser for supporting HTML5 label C anvas, provides CanvasRenderer to play up mechanism; Browser for supporting CSS3, provides CSSRenderer to play up mechanism; For lowest version browsers such as IE6, IE7, IE8, provide FlashRendere to play up mechanism; For all browsers, provide DivRenderer to play up mechanism.
Fig. 4 shows according to the block diagram of the device of the control electronic chart convergent-divergent of first embodiment of the invention.This device comprises target tile arithmetic element 100, prestrain tile arithmetic element 200, the second loading unit 300 and the first loading unit 400.
Target tile arithmetic element 100, is suitable for when receiving the instruction of dwindling map, determines the target display level narrowing down to, and finds out a plurality of target tile that need demonstration in target display level; Wherein, target display level is higher than current display level.Wherein, those skilled in the art can be appreciated that, target display level be according to the instruction of dwindling map of user's input and fixed, in other words, target display level is operate the display level of electronic chart afterwards.Particularly, in the art map is dwindled, can show the tile of higher level, it is large that the represented body of a map or chart of tile of higher level compares the represented body of a map or chart of low level tile, so target display level is higher than current display level.Searching the method for target tile, can be reference method as shown in Figure 2, and the geographical position coordinates of the central point of viewing area and target display level are calculated target tile according to the map.Show that described target tile can access the electronic chart after dwindling clearly.
The first loading unit 400, is suitable for according to the poor loading of rank between current display level and target display level and dwindles the tile that shows current demonstration.Particularly, the first loading unit 400 is according to the poor loading of rank between current display level and target display level and dwindle and show that the tile of current demonstration comprises the transverse width of the tile of current demonstration and is longitudinally highly all reduced into 1/p demonstration, wherein, and p=2
q, q is natural number, represents that the rank between target display level and current display level is poor.If the rank between target display level and current display level is poor is 1, by the transverse width of the tile of current demonstration be longitudinally highly all reduced into 1/2 demonstration; If the rank between target display level and current display level is poor is 2, by the transverse width of the tile of current demonstration be longitudinally highly all reduced into 1/4 demonstration, the rest may be inferred.In the present embodiment, by the tile of current demonstration is dwindled to demonstration, can be rapidly by the fuzzy demonstration rapidly of a part of region of the map after dwindling, the body of a map or chart of periphery shows with lower sharpness rapidly by following prestrain tile arithmetic element 200 and the second loading unit 300.
Prestrain tile arithmetic element 200, is suitable for selecting prestrain display level, finds out the prestrain tile that in prestrain display level, fringe region need load.In the present embodiment, prestrain tile arithmetic element 200, be suitable for selecting the prestrain display level higher than target display level, the represented body of a map or chart of prestrain tile comprise except when outside the represented body of a map or chart of the tile of front demonstration by the represented body of a map or chart of described a plurality of target tile, the represented body of a map or chart of current demonstration tile that the complete body of a map or chart that need to show in viewing area after dwindling is dwindled in removing step S200, above-mentioned " fringe region " namely, and the corresponding geographic areas of each prestrain tile is n times of the corresponding geographic areas of each target tile, n=4
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
The second loading unit 300, is suitable for obtaining prestrain tile and target tile according to priority, according to the poor loading of rank between prestrain display level and target display level amplification, shows prestrain tile; After getting target tile, load and show that described target tile is to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position.By first showing fuzzy amplification prestrain tile, loading velocity is fast, has reduced to show the probability of blank tile on electronic chart.By using target tile clearly to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position, realize clear demonstration map and map and show by fuzzy to display effect clearly.
In the present embodiment, the second loading unit 300, is suitable for the transverse width of each prestrain tile and longitudinally highly all amplifies m doubly showing, wherein, and m=2
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.That is, if the rank between prestrain display level and target display level poor be 1; by the transverse width of each prestrain tile be longitudinally highly all enlarged into 2 times and show; If the rank between prestrain display level and target display level is poor is 2, by the transverse width of each prestrain tile be longitudinally highly all enlarged into 4 times and show.
In the present embodiment, the second loading unit 300, in loaded targets tile, the tile of current demonstration that increase is dwindled and the transparency of the prestrain tile of amplification, in other words, the second loading unit 300, when loaded targets tile, becomes transparent gradually by the prestrain tile of the tile of the current demonstration of dwindling and amplification.Further, when the operation of loaded targets tile completes, the second loading unit 300 removes the tile of the current demonstration of dwindling and the prestrain tile of amplification and display-object tile.Particularly, while having loaded corresponding to several target tile of the tile of a current demonstration of dwindling or the prestrain tile of an amplification, the second loading unit 300 removes the tile of this current demonstration of dwindling or the prestrain tile of amplification, show the several target tile that loaded, make electronic chart more clear.
In the present embodiment, target tile arithmetic element 100, is suitable for the geographical position coordinates of dwindling central point of viewing area and the target display level of map according to the map, converts and obtains dwindling the pixel coordinate of central point; Target display level according to the map, obtains the Pixel Dimensions of the single target tile that need to show; The Pixel Dimensions of viewing area and dwindle the pixel coordinate of central point, obtains the pixel coordinate on two relative summits of map viewing area according to the map; The pixel coordinate on two of viewing area relative summits obtains the target tile in viewing area with the Pixel Dimensions of the single target tile that needs to show according to the map.
In the present embodiment, the target tile arithmetic element 100 according to the map pixel coordinate on two relative summits of viewing area and the Pixel Dimensions of the single target tile that need to show obtains the method for the target tile in viewing area, specifically by obtaining horizontal index number and the longitudinal index number of the target tile at two relative places, summit; And choose horizontal index number between the horizontal index number of the target tile at two relative places, summit and the longitudinal target tile of index number between longitudinal index number of the target tile at two relative places, summit, thereby obtain the target tile in map viewing area.
Wherein, target tile arithmetic element 100, by the pixel coordinate that utilizes respectively the pixel coordinate on summit to deduct the initial point of map to described summit, obtain the difference of horizontal ordinate and the difference of ordinate, the difference of utilizing horizontal ordinate obtains horizontal index number divided by the width of single target tile, and the difference of utilizing ordinate obtains longitudinal index number divided by the height of single target tile.
Fig. 5 shows according to the block diagram of the device of the control electronic chart convergent-divergent of second embodiment of the invention.Similar to the first embodiment as shown in Figure 4 in the present embodiment, difference is, this device also comprises: buffer unit 500.
Further, in the time of in buffer unit 500 is kept at local cache by the tile having shown, if the off-capacity of local cache, buffer unit 500 removes least-recently-used tile from local cache.Particularly, buffer unit 500 adopts LRU(Least Recently Used, least recently used) strategy, when the tile in buffer memory surpasses the capacity of buffer memory setting, can preferentially eliminate least-recently-used tile.
Further, second loading unit 300 of the present embodiment, be suitable for judging that described prestrain tile and target tile are whether in local cache, if be judged as YES, from local cache, read prestrain tile and target tile, if be judged as NO, from server, download prestrain tile and target tile.By preferentially obtaining the tile in buffer memory, can improve loading velocity.
Fig. 6 shows according to the present invention and the schematic diagram of the electronic chart client that realizes.By controlling the method for device and the control electronic chart convergent-divergent of electronic chart convergent-divergent, when electronic chart client is carried out reduction operation in the indication according to user, electronic map window exists blank probability little, and electronic chart performance to procedure for displaying clearly, makes the switching between map rank not obvious by fuzzy.
It should be noted that:
The algorithm providing at this is intrinsic not relevant to any certain computer, virtual system or miscellaneous equipment with demonstration.Various general-purpose systems also can with based on using together with this teaching.According to description above, it is apparent constructing the desired structure of this type systematic.In addition, the present invention is not also for any certain programmed language.It should be understood that and can utilize various programming languages to realize content of the present invention described here, and the description of above language-specific being done is in order to disclose preferred forms of the present invention.
In the instructions that provided herein, a large amount of details have been described.Yet, can understand, embodiments of the invention can not put into practice in the situation that there is no these details.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Similarly, be to be understood that, in order to simplify the disclosure and to help to understand one or more in each inventive aspect, in the above in the description of exemplary embodiment of the present invention, each feature of the present invention is grouped together into single embodiment, figure or sometimes in its description.Yet, the method for the disclosure should be construed to the following intention of reflection: the present invention for required protection requires than the more feature of feature of clearly recording in each claim.Or rather, as reflected in claims below, inventive aspect is to be less than all features of disclosed single embodiment above.Therefore, claims of following embodiment are incorporated to this embodiment thus clearly, and wherein each claim itself is as independent embodiment of the present invention.
Those skilled in the art are appreciated that and can the module in the equipment in embodiment are adaptively changed and they are arranged in one or more equipment different from this embodiment.Module in embodiment or unit or assembly can be combined into a module or unit or assembly, and can put them into a plurality of submodules or subelement or sub-component in addition.At least some in such feature and/or process or unit are mutually repelling, and can adopt any combination to combine all processes or the unit of disclosed all features in this instructions (comprising claim, summary and the accompanying drawing followed) and disclosed any method like this or equipment.Unless clearly statement in addition, in this instructions (comprising claim, summary and the accompanying drawing followed) disclosed each feature can be by providing identical, be equal to or the alternative features of similar object replaces.
In addition, those skilled in the art can understand, although embodiment more described herein comprise some feature rather than further feature included in other embodiment, the combination of the feature of different embodiment means within scope of the present invention and forms different embodiment.For example, in the following claims, the one of any of embodiment required for protection can be used with array mode arbitrarily.
All parts embodiment of the present invention can realize with hardware, or realizes with the software module moved on one or more processor, or realizes with their combination.It will be understood by those of skill in the art that and can use in practice microprocessor or digital signal processor (DSP) to realize according to the some or all functions of the some or all parts in the equipment of the control electronic chart convergent-divergent of the embodiment of the present invention.The present invention for example can also be embodied as, for carrying out part or all equipment or device program (, computer program and computer program) of method as described herein.Realizing program of the present invention and can be stored on computer-readable medium like this, or can there is the form of one or more signal.Such signal can be downloaded and obtain from internet website, or provides on carrier signal, or provides with any other form.
It should be noted above-described embodiment the present invention will be described rather than limit the invention, and those skilled in the art can design alternative embodiment in the situation that do not depart from the scope of claims.In the claims, any reference symbol between bracket should be configured to limitations on claims.Word " comprises " not to be got rid of existence and is not listed as element or step in the claims.Being positioned at word " " before element or " one " does not get rid of and has a plurality of such elements.The present invention can be by means of including the hardware of some different elements and realizing by means of the computing machine of suitably programming.In having enumerated the unit claim of some devices, several in these devices can be to carry out imbody by same hardware branch.The use of word first, second and C grade does not represent any order.Can be title by these word explanations.
Claims (10)
1. control a device for electronic chart convergent-divergent, this device comprises:
Target tile arithmetic element, is suitable for when receiving the instruction of dwindling map, determines the target display level narrowing down to, and finds out a plurality of target tile that need demonstration in target display level; Wherein, target display level is higher than current display level;
The first loading unit, is suitable for according to the poor loading of rank between current display level and target display level and dwindles the tile that shows current demonstration;
Prestrain tile arithmetic element, is suitable for selecting prestrain display level, finds out the prestrain tile that in prestrain display level, fringe region need load;
The second loading unit, is suitable for obtaining prestrain tile and target tile according to priority, according to the poor loading of rank between prestrain display level and target display level amplification, shows prestrain tile; After getting target tile, load and show that described target tile is to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position.
2. device according to claim 1, wherein,
Described prestrain tile arithmetic element, be suitable for selecting the prestrain display level higher than target display level, the represented body of a map or chart of described prestrain tile comprise except when outside the represented body of a map or chart of the tile of front demonstration by the represented body of a map or chart of described a plurality of target tile, and the corresponding geographic areas of each prestrain tile is n times of the corresponding geographic areas of each target tile, n=4
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
3. control a method for electronic chart convergent-divergent, wherein, the method comprises:
When receiving the instruction of dwindling map, determine the target display level narrowing down to, find out a plurality of target tile that need demonstration in target display level; Wherein, target display level is higher than current display level;
According to the poor loading of rank between current display level and target display level and dwindle the tile that shows current demonstration;
Select prestrain display level, find out the prestrain tile that in prestrain display level, fringe region need load;
According to priority, obtain prestrain tile and target tile, according to the poor loading of rank between prestrain display level and target display level amplification, show prestrain tile;
After getting target tile, load and show that described target tile is to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position.
4. method according to claim 3, wherein,
Described prestrain display level is higher than target display level, the represented body of a map or chart of described prestrain tile comprise except when outside the represented body of a map or chart of the tile of front demonstration by the represented body of a map or chart of described a plurality of target tile, and the corresponding geographic areas of each prestrain tile is n times of the corresponding geographic areas of each target tile, n=4
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
5. according to the method described in claim 3 or 4, wherein,
Described according to the poor loading of rank between current display level and target display level and dwindle the tile that shows current demonstration, comprising: by the transverse width of the tile of current demonstration be longitudinally highly all reduced into 1/p demonstration, wherein, p=2
q, q is natural number, represents that the rank between target display level and current display level is poor;
Described according to the poor loading of rank between prestrain display level and target display level and amplify to show prestrain tile, comprising: by the transverse width of each prestrain tile with longitudinally highly all amplify m and doubly show, wherein, m=2
k, k is natural number, represents that the rank between prestrain display level and target display level is poor.
6. according to the method described in claim 3-5 any one, wherein, the method also comprises:
Local cache is set;
The tile having shown is kept in local cache.
7. according to the method described in claim 3-6 any one, wherein, the method also comprises:
In the time of in the tile having shown is kept to local cache, if the off-capacity of local cache removes least-recently-used tile from local cache.
8. according to the method described in claim 3-7 any one, wherein, describedly according to priority, obtain prestrain tile and target tile specifically comprises:
Judge that described prestrain tile and target tile whether in local cache, if be judged as YES, read prestrain tile and target tile from local cache, if be judged as NO, from server, download prestrain tile and target tile.
9. according to the method described in the arbitrary claim of claim 3-8, wherein, described loading also shows that described target tile, to replace the tile of the current demonstration of dwindling and the prestrain tile of amplification of correspondence position, specifically comprises:
In loaded targets tile, the tile of current demonstration that increase is dwindled and the transparency of the prestrain tile of amplification; When the operation of loaded targets tile completes, remove the tile of the current demonstration of dwindling and the prestrain tile of amplification and display-object tile.
10. according to the method described in the arbitrary claim of claim 3-9, wherein,
The described a plurality of target tile that need demonstration in target display level that find out, comprising:
The geographical position coordinates of dwindling central point of viewing area and the target display level of map, convert and obtain dwindling the pixel coordinate of central point according to the map;
Target display level according to the map, obtains the Pixel Dimensions of the single target tile that need to show;
The Pixel Dimensions of viewing area and dwindle the pixel coordinate of central point, obtains the pixel coordinate on two relative summits of map viewing area according to the map;
The pixel coordinate on two of viewing area relative summits obtains the target tile in viewing area with the Pixel Dimensions of the single target tile that needs to show according to the map.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310746249.2A CN103700126B (en) | 2013-12-30 | 2013-12-30 | A kind of device controlling electronic chart scaling and corresponding method |
| CN201610415014.9A CN106126527B (en) | 2013-12-30 | 2013-12-30 | A kind of device and corresponding method of control electronic map scaling |
| PCT/CN2014/087173 WO2015101070A1 (en) | 2013-12-30 | 2014-09-23 | Device and method for controlling electronic map |
| US15/108,969 US9728167B2 (en) | 2013-12-30 | 2014-09-23 | Device and method for controlling electronic map |
| US15/666,245 US9972285B2 (en) | 2013-12-30 | 2017-08-01 | Device and method for controlling electronic map |
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| 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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| CN201610415014.9A Division CN106126527B (en) | 2013-12-30 | 2013-12-30 | A kind of device and corresponding method of control electronic map scaling |
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| CN201310746249.2A Active CN103700126B (en) | 2013-12-30 | 2013-12-30 | A kind of device controlling electronic chart scaling and corresponding method |
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| CN106126527B (en) | 2018-09-18 |
| CN106126527A (en) | 2016-11-16 |
| CN103700126B (en) | 2016-08-17 |
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