CN104700709A - Map display method and device - Google Patents
Map display method and device Download PDFInfo
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- CN104700709A CN104700709A CN201310653026.1A CN201310653026A CN104700709A CN 104700709 A CN104700709 A CN 104700709A CN 201310653026 A CN201310653026 A CN 201310653026A CN 104700709 A CN104700709 A CN 104700709A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
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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
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Abstract
The invention discloses a map display method and device. The method includes: acquiring the current central point of an electronic map displayed on a navigation equipment screen and the target central point of a to-be-displayed electronic map; selecting at one middle point between the current central point and the target central point; displaying the to-be-displayed electronic map on the navigation equipment screen by sequentially using each middle point and the target central point as the central point and according to the distance from each middle point and the target central point to the current central point from near to far. The method has the advantages that during switching display of maps corresponding to two points, multiple points between the two points can be selected as the middle points, the electronic maps corresponding to the middle points are then sequentially displayed, coherent display of the maps of the middle points is achieved, electronic map switching is allowed to be approximate to animation coherent display, the eyes of a user do not need to refocus repeatedly to adapt to images, user visual fatigue is reduced, and user experience is improved.
Description
Technical field
The application relates to area of geographic information, particularly a kind of map-indication method and device.
Background technology
At present, when user carries out information point POI search in electronic chart, many POI records may be searched out, when user needs to check certain POI, click corresponding POI record and can show this POI in the center position of navigator screen, namely navigator is when user clicks POI record, puts and again on screen, draw electronic chart centered by the coordinate of the POI of meeting in this POI records.This kind shows that the mode of electronic chart needs user that former and later two POI's checked is distant, can not while there is following technical matters when navigator screen display:
After user clicks previous POI, navigator is point-rendering electronic chart centered by this previous POI coordinate, after user clicks again during a POI record, navigator point centered by this rear POI coordinate repaints electronic chart, distant due between two POI, the content difference that the electronic map interface of drawing before and after making comprises is larger, an electronic map interface after directly being jumped to by last electronic map interface, electronic chart is shown comparatively stiff, and due to the unexpected change of map interface, eyes of user is made to need again to focus on adaptation picture, cause user's visual fatigue, Consumer's Experience is poor.
Summary of the invention
Technical problems to be solved in this application are to provide a kind of map-indication method and device, in order to solve prior art, current electronic map is directly jumped to electronic chart to be shown, electronic chart is shown comparatively stiff, eyes of user is needed again to focus on adaptation picture, cause user's visual fatigue, affect the technical matters of Consumer's Experience.
This application provides a kind of map-indication method, comprising:
Obtain the Current central point of navigator screen display electronic chart and target's center's point of electronic chart to be shown;
At least one intermediate point is chosen between described Current central point and described target's center's point;
Point centered by described intermediate point and described target's center's point successively, according to intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, at the screen display electronic chart of described navigator.
Said method, preferably, between described Current central point and described target's center's point, choose at least one intermediate point, comprising:
Determine the distance between described Current central point and described target's center's point;
Judge whether described distance is greater than default distance threshold;
If so, on the line between described Current central point and described target's center's point, the distance of Current central point described in selected distance equals the 3rd central point of described distance threshold; With described Current central point for starting point, choose at least one intermediate point according to predetermined interval distance from the line of Current central point and described 3rd central point;
Otherwise, with described Current central point for starting point, choose at least one intermediate point according to predetermined interval distance from the line of Current central point and target's center's point.
Said method, preferred:
If the coordinate of described Current central point, described target's center's point and described intermediate point is the screen coordinate that geographical latitude and longitude coordinates is converted to, then described distance threshold is the half of the screen diagonal length of described navigator;
If the coordinate of described Current central point, described target's center's point and described intermediate point is geographical latitude and longitude coordinates, then described distance threshold is the distance on the spot after the half of the screen diagonal length of described navigator is changed according to the engineer's scale of electronic chart.
Said method, preferably, point centered by described intermediate point and described target's center's point successively, according to intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, at the screen display electronic chart of described navigator, comprising:
Obtain the map datum of buffer memory during the electronic chart generating and put centered by described Current central point;
According to each intermediate point apart from described Current central point order from the close-by examples to those far off, according to the coordinate of each intermediate point and the screen size of navigator, from the map datum of buffer memory, copy using each intermediate point central point that is electronic chart and cover image corresponding to geographic range and described navigator screen size as the electronic chart put centered by corresponding intermediate point, and this electronic chart of buffer memory;
Obtain the map datum centered by described target's center's point, and generate the electronic chart centered by target's center's point according to the map datum obtained, and this electronic chart of buffer memory;
According to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, the corresponding electronic chart of buffer memory is presented on the screen of described navigator.
Said method, preferably, according to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, is presented at the corresponding electronic chart of buffer memory on the screen of described navigator, comprises:
According to intermediate point and target's center apart from described Current central point order from the close-by examples to those far off, be presented on the screen of described navigator every the corresponding electronic chart of a prefixed time interval by a buffer memory.
Present invention also provides a kind of map display, comprising:
Central point acquiring unit, for target's center's point of the Current central point and electronic chart to be shown that obtain navigator screen display electronic chart;
Intermediate point chooses unit, for choosing at least one intermediate point between described Current central point and described target's center's point;
Map denotation unit, for point centered by each described intermediate point and described target's center's point successively, according to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, at the screen display electronic chart of described navigator.
Said apparatus, preferably, described intermediate point is chosen unit and is comprised:
Distance determines subelement, for determining the distance between described Current central point and described target's center's point;
Threshold decision subelement, for judging whether described distance is greater than default distance threshold, if so, triggering first and choosing subelement, otherwise, trigger second and choose subelement;
First chooses subelement, and for the line between described Current central point and described target's center's point, the distance of Current central point described in selected distance equals the 3rd central point of described distance threshold; With described Current central point for starting point, choose at least one intermediate point according to predetermined interval distance from the line of described Current central point and described 3rd central point;
Second chooses subelement, with described Current central point for starting point, chooses at least one intermediate point according to predetermined interval distance from the line of Current central point and target's center's point.
Said apparatus, preferred:
If the coordinate of described Current central point, described target's center's point and described intermediate point is the screen coordinate that geographical latitude and longitude coordinates is converted to, then described distance threshold is the half of the screen diagonal length of described navigator;
If the coordinate of described Current central point, described target's center's point and described intermediate point is geographical latitude and longitude coordinates, then described distance threshold is the distance on the spot after the half of the screen diagonal length of described navigator is changed according to the engineer's scale of electronic chart.
Said apparatus, preferably, described map denotation unit comprises:
Data acquisition subelement, for obtain generate put centered by described Current central point electronic chart time buffer memory map datum;
First map obtains subelement, for according to each intermediate point apart from described Current central point order from the close-by examples to those far off, according to the coordinate of each intermediate point and the screen size of navigator, from the map datum of buffer memory, copy using each intermediate point central point that is electronic chart and cover image corresponding to geographic range and described navigator screen size as the electronic chart put centered by corresponding intermediate point, and this electronic chart of buffer memory;
Second map obtains subelement, for obtaining the map datum centered by described target's center's point, and generates the electronic chart centered by target's center's point according to the map datum obtained, and this electronic chart of buffer memory;
Buffer memory display subelement, for according to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, the corresponding electronic chart of buffer memory is presented on the screen of described navigator.
Said apparatus, preferably, described buffer memory display subelement, specifically for: according to intermediate point and target's center apart from described Current central point order from the close-by examples to those far off, be presented on the screen of described navigator every the corresponding electronic chart of a prefixed time interval by a buffer memory.
From such scheme, a kind of map-indication method that the application provides and device, by the Current central point of acquisition navigator screen display electronic chart and target's center's point of electronic chart to be shown, intermediate point is selected in this prior afterwards between central point and target's center's point, and then point centered by intermediate point and target's center's point successively, according to intermediate point and target intermediate point distance Current central point order from the close-by examples to those far off, the screen of navigator shows electronic chart, realizes the application's object.The application is when realizing the switching display between the corresponding map of two points, by choosing multiple points between 2 as intermediate point, and then electronic chart corresponding for these intermediate points is shown successively, reach multiple intermediate point map link up display object, electronic chart handoff procedure is made to be similar to the coherent display of animation, eyes of user adapts to picture without the need to repeatedly again focusing on largely, reduces user's visual fatigue, improves Consumer's Experience.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of map-indication method process flow diagram that Fig. 1 provides for the embodiment of the present application one;
Fig. 2 is an application example figure of the embodiment of the present application;
The partial process view of a kind of map-indication method that Fig. 3 provides for the embodiment of the present application two;
Fig. 4 is the Another Application exemplary plot of the embodiment of the present application;
The partial process view of a kind of map-indication method that Fig. 5 provides for the embodiment of the present application three;
Fig. 6 is the another application example figure of the embodiment of the present application;
Fig. 7 is the Another Application exemplary plot of the embodiment of the present application;
The structural representation of a kind of map display that Fig. 8 provides for the embodiment of the present application four;
The part-structure schematic diagram of a kind of map display that Fig. 9 provides for the embodiment of the present application five;
The part-structure schematic diagram of a kind of map display that Figure 10 provides for the embodiment of the present application six.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Embodiment one
With reference to figure 1, for the process flow diagram of a kind of map-indication method that the embodiment of the present application one provides, described method is applied in the electronic equipments such as navigator (as navigating instrument, the mobile terminal (as mobile phone) being provided with navigation software), described navigator comprises the screen of display electronic chart, described display screen can be LCDs also can be touch display screen, and described method can comprise the following steps:
Step 101: obtain the Current central point of navigator screen display electronic chart and target's center's point of electronic chart to be shown.
Wherein, the central point of the electronic chart of current display on the screen that described Current central point refers to described navigator, the screen that described target's center's point refers to described navigator needs the central point of the electronic chart shown.
Take navigator as the mobile phone being provided with navigation software, in mobile phone display screen curtain, the central point of the electronic chart of current display is Po point (i.e. Current central point).And user is when needs carry out Map Switch, to check required for user and the central point being presented at the electronic chart on the display screen of navigator is Pk(and target's center's point).As shown in Figure 2.
Step 102: choose at least one intermediate point between described Current central point and described target's center's point.
Step 103: point centered by described intermediate point and described target's center's point successively, according to intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, at the screen display electronic chart of described navigator.
It should be noted that, each described intermediate point to be distributed between described Current central point and described target's center's point on line successively, therefore, each described intermediate point and described target's center's point have distance Current central point order from the close-by examples to those far off, or described Current central point and each described intermediate point have the order drawn near of distance objective central point.
Wherein, the number of described intermediate point can be arranged by user, and such as 12 or 24 etc., the number of described intermediate point is more, and follow-up continuity of carrying out on the screen of described navigator when showing electronic chart is stronger, and the calculated amount of correspondence is larger.
It should be noted that, in described step 103, can also realize as follows: point centered by described intermediate point and described target's center's point successively, according to intermediate point and target's center's point apart from described target's center's point order from the close-by examples to those far off, at the screen display electronic chart of described navigator.This implementation and aforementioned point centered by described intermediate point and described target's center's point successively, according to intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, belong to same idea in the mode of the screen display electronic chart of described navigator, be not described in detail at this.
From such scheme, a kind of map-indication method that the embodiment of the present application one provides, by the Current central point of acquisition navigator screen display electronic chart and target's center's point of electronic chart to be shown, intermediate point is selected in this prior afterwards between central point and target's center's point, and then point centered by intermediate point and target's center's point successively, according to intermediate point and target intermediate point distance Current central point order from the close-by examples to those far off, the screen of navigator shows electronic chart, realizes the application's object.The embodiment of the present application one is when realizing the switching display between the corresponding map of two points, by choosing multiple points between 2 as intermediate point, and then electronic chart corresponding for these intermediate points is shown successively, reach multiple intermediate point map link up display object, electronic chart handoff procedure is made to be similar to the coherent display of animation, eyes of user adapts to picture without the need to repeatedly again focusing on largely, reduces user's visual fatigue, improves Consumer's Experience.
Embodiment two
Compared with the map-indication method that the map-indication method that the embodiment of the present application two provides and embodiment one provide, refinement is carried out to step 102 in the process flow diagram shown in earlier figures 1.With reference to figure 3, be the process flow diagram of step 102, wherein, described step 102 can pass through following steps specific implementation:
Step 121: determine the distance between described Current central point and described target's center's point.
Step 122: judge whether described distance is greater than default distance threshold, when described distance is greater than described distance threshold, performs step 123, otherwise, perform step 125.
Step 123: on the line between described Current central point and described target's center's point, the distance of Current central point described in selected distance equals the 3rd central point of described distance threshold, performs step 124.
Step 124: with described Current central point for starting point, chooses at least one intermediate point according to predetermined interval distance from the line of Current central point and described 3rd central point.
Step 125: with described Current central point for starting point, chooses at least one intermediate point according to predetermined interval distance from the line of Current central point and target's center's point.
In the embodiment of the present invention, if the coordinate of Current central point, described target's center's point and described intermediate point is the screen coordinate that geographical latitude and longitude coordinates is converted to, distance then between the Current central point that calculates of step 121 and target's center's point is screen distance, then described distance threshold is the half of the screen diagonal length of described navigator by the embodiment of the present invention.If the coordinate of described Current central point, described target's center's point and described intermediate point is geographical latitude and longitude coordinates, then the distance of the Current central point that calculates of described step 121 and target's center's point is the distance on the spot between Current central point and target's center's point, then described distance threshold is the distance on the spot after the half of the screen diagonal length of described navigator is changed according to the engineer's scale of electronic chart.
It should be noted that, when the distance that described step 121 calculates is greater than described distance threshold, show that target's center's point of electronic chart to be shown is in outside the present displayed content of the electronic chart that the screen of described navigator shows, now, can be called that long distance switches, thus, to perform in step 123 between described Current central point and target's center's point on line, choose the 3rd central point, and then perform step 124, by Current central point, from the line of Current central point and the 3rd central point, select at least one intermediate point, thus, can point centered by described intermediate point and described target's center's point successively in subsequent step 103, according to intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, at each intermediate point of the screen display of described navigator and each self-corresponding electronic chart of target's center's point.
As shown in Figure 4, on the line between described Current central point Po point and target's center's point Pk point, the 3rd center point P c point is chosen.
It should be noted that, when the distance that described step 121 calculates is less than or equal to described distance threshold, show that target's center's point of current electronic chart to be shown is in the present displayed content of the electronic chart that the screen of described navigator shows, now, can be called that short distance switches, thus, in described step 125 by described Current central point, the line of Current central point and target's center's point chooses at least one intermediate point every predetermined interval distance.By can point centered by described intermediate point and described target's center's point successively in subsequent step 103, according to intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, at each intermediate point of the screen display of described navigator and each self-corresponding electronic chart of target's center's point.
It should be noted that, above-mentioned each realizes in embodiment, when showing each intermediate point and each self-corresponding electronic chart of target's center's point in the screen of navigator in described step 103, along with the raising in existing computing power and each orientation of data rate, intermediate point and target's center is made to put the speed of the acquisition of corresponding electronic chart and display very rapid, the time showing the plurality of central electron map needs is shorter, and user may be given with the effect of coherent display.Therefore, for improving the effect of coherent display electronic chart further, the embodiment of the present invention pre-sets a time interval, as 20 milliseconds or 40 milliseconds.In step 103, be implemented as follows: according to intermediate point and target's center apart from described Current central point order from the close-by examples to those far off, be presented on the screen of described navigator every the corresponding electronic chart of a prefixed time interval by a buffer memory.The embodiment of the present invention does not do strict restriction to the value in the described time interval, can arrange flexibly as required.Preferably, for meeting the demand of different user further, can be set interval by user, time interval user arranged is as prefixed time interval.It is 20 milliseconds that young user as good in eyesight can set interval, and it is 40 milliseconds etc. that the poor user of eyesight can set interval.
Embodiment three
In actual applications, the acquisition of corresponding electronic chart and coherent display speed is put in order to improve intermediate point and target's center, pre-rendered and buffer memory can be carried out by each intermediate point and target's center being put corresponding electronic chart, when the electronic chart of screen display point centered by intermediate point and target's center's point of navigator, from buffer memory, directly obtain corresponding electronic chart, and at the screen display of navigator.The present embodiment three is compared with embodiment two with previous embodiment one, and distinctive points is to carry out refinement to the step 103 in the flow process shown in Fig. 1.Therefore, with reference to figure 5, be the process flow diagram of step 103, wherein, described step 103 can comprise the following steps:
Step 131: the map datum obtaining buffer memory during the electronic chart generating and put centered by described Current central point.
It should be noted that, when described navigator shows its current electronic map on its screen, needing the map datum obtained from map data base for drawing the electronic chart put centered by Current central point, and the map datum that buffer memory obtains.And its geographic range covered of the map datum of this acquisition is greater than the geographic range that the electronic chart put centered by Current central point covers.
Step 132: according to each intermediate point apart from described Current central point order from the close-by examples to those far off, according to the screen size of each intermediate point coordinate and navigator, from the map datum of buffer memory, copy using each intermediate point central point that is electronic chart and cover image corresponding to geographic range and described navigator screen size as the electronic chart put centered by corresponding intermediate point, and this electronic chart of buffer memory.
Step 133: obtain the map datum centered by described target's center's point, and generate the electronic chart centered by target's center's point according to the map datum obtained, and this electronic chart of buffer memory.
Step 134: according to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, the corresponding electronic chart of buffer memory is presented on the screen of described navigator.
Preferably, in step 134, realize in the following manner: according to intermediate point and target's center apart from described Current central point order from the close-by examples to those far off, be presented on the screen of described navigator every the corresponding electronic chart of a prefixed time interval by a buffer memory.And this prefixed time interval can dynamically arrange, actual conditions such as according to the use user of Present navigation equipment set, it is 20 milliseconds that young user as good in eyesight can arrange interval time length, it is 40 milliseconds etc. that the poor old user of eyesight can arrange interval time length, better realize each intermediate point and target's center thus and put coherent switching display between corresponding electronic chart, the coherent display of more approximate animation, eyes of user adapts to picture without the need to repeatedly again focusing on largely, reduce user's visual fatigue, improve Consumer's Experience.
The technical scheme that the embodiment of the present invention three provides, on the one hand, owing to generating the electronic chart put centered by each intermediate point, directly from the map datum of buffer memory, copy using each intermediate point central point that is electronic chart and cover image corresponding to geographic range and described navigator screen size as the electronic chart put centered by corresponding intermediate point, and do not need the map datum that obtains from map data base for drawing the electronic chart put centered by each intermediate point, and then draw according to the map datum obtained the electronic chart put centered by intermediate point, therefore, the technical scheme that the embodiment of the present invention three provides can be very quick, obtain the electronic chart put centered by intermediate point efficiently.On the other hand, after the electronic chart obtaining point centered by intermediate point, target's center's point, by this electronic chart buffer memory, during follow-up displaying electronic chart, directly from buffer memory, obtain corresponding electronic chart and show, further can accelerate electronic chart and show speed.
For ease of the understanding of those skilled in the art to technical solution of the present invention, make a more detailed description with the concrete specific implementation of example to technical solution of the present invention below:
A) central point (i.e. target's center's point) obtaining the central point (i.e. Current central point) of the electronic chart switching front display and the electronic chart after switching is P0, Pk, and P0, Pk are screen coordinate.
B) screen distance calculating P0 and Pk is D.
C) judge whether D is greater than default distance threshold X(X=d/2, wherein d is cornerwise length of the screen of navigator), if D is less than or equal to X, be then judged as that short distance switches, according to method process d) below; Otherwise for long distance switches, according to method process e) below.
D) short-range switching: calculate P0, Pk line screen displacement DX, DY}, wherein DX=(Xk-X0), DY=(Yk-Y0); Will { DX, DY} be divided into n part and obtain that { dx=DX ÷ n, dy=DY ÷ n}, wherein n is that intermediate point quantity adds 1.Every a prefixed time interval t, the electronic chart of navigation apparatus displays screen is moved { dx, dy}.N movement altogether, spended time T=t × n, { DX, DY} so that central point is switched to target's center's point Pk, and show the electronic chart put centered by Pk on the screen of navigator in total displacement.Owing to switching the displacement of change at every turn, { dx, dy} are less, and Map Switch seems more coherent.Continuity is relevant with P0, Pk distance size and n value.Because P0 to Pk distance is shorter, the front figure that moves for n time can draw by rendering cache, improves display efficiency.As shown in Figure 6, in the process that short distance switches, the change procedure of viewing area in the window of navigator screen.
E) switching of long distance: get Pc on the line of P0, Pk, Pc={Xc, Yc}, the distance of this Pc to P0 equals X, calculate P0, Pc line screen displacement FX, FY}, DX=(Xc-X0), DY=(Yc-Y0); Will { FX, FY} be divided into n part and obtain that { dx=FX ÷ n, dy=FY ÷ n}, wherein n is that the quantity of intermediate point adds 1.Every a time interval t, video in window is moved { dx, dy}.N movement altogether, spended time T=t × n, { FX, FY} so that central point is switched to target's center's point Pk, and show the electronic chart put centered by Pk on the screen of navigator in total displacement.Although Pc to Pk displacement is comparatively large, there is the coherent display electronic chart of P0 to Pc, made the display of electronic chart entirety comparatively coherent.As shown in Figure 7, in the process that long distance switches, the change procedure of viewing area in the window of navigator screen.
Embodiment four
With reference to figure 8, be the structural representation of a kind of map display that the embodiment of the present application four provides, device comprises:
Central point acquiring unit 801, for target's center's point of the Current central point and electronic chart to be shown that obtain navigator screen display electronic chart.
Intermediate point chooses unit 802, for choosing at least one intermediate point between described Current central point and described target's center's point.
Map denotation unit 803, for point centered by each described intermediate point and described target's center's point successively, according to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, at the screen display electronic chart of described navigator.
Embodiment five
Compared with the map display that the map display that the embodiment of the present application five provides and embodiment four provide, the concrete structure getting unit 802 is clicked to centre and carries out refinement, with reference to figure 9, for intermediate point chooses the structural representation of unit 802, wherein, described intermediate point is chosen unit 802 and can be comprised:
Distance determines subelement 821, for determining the distance between described Current central point and described target's center's point.
Threshold decision subelement 822, for judging whether described distance is greater than default distance threshold, if so, triggering first and choosing subelement 823, otherwise, trigger second and choose subelement 824.
First chooses subelement 823, for the line between described Current central point and described target's center's point, the distance of Current central point described in selected distance equals the 3rd central point of described distance threshold, with described Current central point for starting point, choose at least one intermediate point according to predetermined interval distance from the line of described Current central point and described 3rd central point.
If the coordinate of described Current central point, described target's center's point and described intermediate point is geographical latitude and longitude coordinates, when described distance threshold is the distance on the spot after the half of the screen diagonal length of described navigator is changed according to the engineer's scale of electronic chart.
Embodiment six
The map display provided in the embodiment of the present application nine is compared with embodiment five with previous embodiment four, carries out refinement to the structure of map display unit 803.With reference to Figure 10, be the structural representation of map denotation unit 803, wherein, described map denotation unit 803 can comprise:
Data acquisition subelement 831, for obtain generate put centered by described Current central point electronic chart time buffer memory map datum.
First map obtains subelement 832, for according to each intermediate point apart from described Current central point order from the close-by examples to those far off, according to the coordinate of each intermediate point and the screen size of navigator, from the map datum of buffer memory, copy using each intermediate point central point that is electronic chart and cover image corresponding to geographic range and described navigator screen size as the electronic chart put centered by corresponding intermediate point, and this electronic chart of buffer memory.
Second map obtains subelement 833, for obtaining the map datum centered by described target's center's point, and generates the electronic chart centered by target's center's point according to the map datum obtained, and this electronic chart of buffer memory.
Buffer memory display subelement 834, for according to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, the corresponding electronic chart of buffer memory is presented on the screen of described navigator.
Described buffer memory display subelement 834, specifically for: according to intermediate point and target's center apart from described Current central point order from the close-by examples to those far off, be presented on the screen of described navigator every the corresponding electronic chart of a prefixed time interval by a buffer memory.
It should be noted that, each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
A kind of map-indication method provided the application above and device are described in detail, apply specific case herein to set forth the principle of the application and embodiment, the explanation of above embodiment is just for helping method and the core concept thereof of understanding the application; Meanwhile, for one of ordinary skill in the art, according to the thought of the application, all will change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the application.
Claims (10)
1. a map-indication method, is characterized in that, comprising:
Obtain the Current central point of navigator screen display electronic chart and target's center's point of electronic chart to be shown;
At least one intermediate point is chosen between described Current central point and described target's center's point;
Point centered by described intermediate point and described target's center's point successively, according to intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, at the screen display electronic chart of described navigator.
2. method according to claim 1, is characterized in that, chooses at least one intermediate point, comprising between described Current central point and described target's center's point:
Determine the distance between described Current central point and described target's center's point;
Judge whether described distance is greater than default distance threshold;
If so, on the line between described Current central point and described target's center's point, the distance of Current central point described in selected distance equals the 3rd central point of described distance threshold; With described Current central point for starting point, choose at least one intermediate point according to predetermined interval distance from the line of Current central point and described 3rd central point;
Otherwise, with described Current central point for starting point, choose at least one intermediate point according to predetermined interval distance from the line of Current central point and target's center's point.
3. method according to claim 2, is characterized in that:
If the coordinate of described Current central point, described target's center's point and described intermediate point is the screen coordinate that geographical latitude and longitude coordinates is converted to, then described distance threshold is the half of the screen diagonal length of described navigator;
If the coordinate of described Current central point, described target's center's point and described intermediate point is geographical latitude and longitude coordinates, then described distance threshold is the distance on the spot after the half of the screen diagonal length of described navigator is changed according to the engineer's scale of electronic chart.
4. the method according to claims 1 to 3 any one, it is characterized in that, point centered by described intermediate point and described target's center's point successively, according to intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, at the screen display electronic chart of described navigator, comprising:
Obtain the map datum of buffer memory during the electronic chart generating and put centered by described Current central point;
According to each intermediate point apart from described Current central point order from the close-by examples to those far off, according to the coordinate of each intermediate point and the screen size of navigator, from the map datum of buffer memory, copy using each intermediate point central point that is electronic chart and cover image corresponding to geographic range and described navigator screen size as the electronic chart put centered by corresponding intermediate point, and this electronic chart of buffer memory;
Obtain the map datum centered by described target's center's point, and generate the electronic chart centered by target's center's point according to the map datum obtained, and this electronic chart of buffer memory;
According to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, the corresponding electronic chart of buffer memory is presented on the screen of described navigator.
5. method according to claim 4, is characterized in that, according to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, is presented on the screen of described navigator by the corresponding electronic chart of buffer memory, comprises:
According to intermediate point and target's center apart from described Current central point order from the close-by examples to those far off, be presented on the screen of described navigator every the corresponding electronic chart of a prefixed time interval by a buffer memory.
6. a map display, is characterized in that, comprising:
Central point acquiring unit, for target's center's point of the Current central point and electronic chart to be shown that obtain navigator screen display electronic chart;
Intermediate point chooses unit, for choosing at least one intermediate point between described Current central point and described target's center's point;
Map denotation unit, for point centered by each described intermediate point and described target's center's point successively, according to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, at the screen display electronic chart of described navigator.
7. device according to claim 6, is characterized in that, described intermediate point is chosen unit and comprised:
Distance determines subelement, for determining the distance between described Current central point and described target's center's point;
Threshold decision subelement, for judging whether described distance is greater than default distance threshold, if so, triggering first and choosing subelement, otherwise, trigger second and choose subelement;
First chooses subelement, and for the line between described Current central point and described target's center's point, the distance of Current central point described in selected distance equals the 3rd central point of described distance threshold; With described Current central point for starting point, choose at least one intermediate point according to predetermined interval distance from the line of described Current central point and described 3rd central point;
Second chooses subelement, with described Current central point for starting point, chooses at least one intermediate point according to predetermined interval distance from the line of Current central point and target's center's point.
8. method according to claim 7, is characterized in that:
If the coordinate of described Current central point, described target's center's point and described intermediate point is the screen coordinate that geographical latitude and longitude coordinates is converted to, then described distance threshold is the half of the screen diagonal length of described navigator;
If the coordinate of described Current central point, described target's center's point and described intermediate point is geographical latitude and longitude coordinates, then described distance threshold is the distance on the spot after the half of the screen diagonal length of described navigator is changed according to the engineer's scale of electronic chart.
9. the method according to claim 6 ~ 8 any one, is characterized in that, described map denotation unit comprises:
Data acquisition subelement, for obtain generate put centered by described Current central point electronic chart time buffer memory map datum;
First map obtains subelement, for according to each intermediate point apart from described Current central point order from the close-by examples to those far off, according to the coordinate of each intermediate point and the screen size of navigator, from the map datum of buffer memory, copy using each intermediate point central point that is electronic chart and cover image corresponding to geographic range and described navigator screen size as the electronic chart put centered by corresponding intermediate point, and this electronic chart of buffer memory;
Second map obtains subelement, for obtaining the map datum centered by described target's center's point, and generates the electronic chart centered by target's center's point according to the map datum obtained, and this electronic chart of buffer memory;
Buffer memory display subelement, for according to each intermediate point and target's center's point apart from described Current central point order from the close-by examples to those far off, the corresponding electronic chart of buffer memory is presented on the screen of described navigator.
10. device according to claim 9, is characterized in that, described buffer memory display subelement, specifically for:
According to intermediate point and target's center apart from described Current central point order from the close-by examples to those far off, be presented on the screen of described navigator every the corresponding electronic chart of a prefixed time interval by a buffer memory.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310653026.1A CN104700709A (en) | 2013-12-05 | 2013-12-05 | Map display method and device |
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| CN201310653026.1A CN104700709A (en) | 2013-12-05 | 2013-12-05 | Map display method and device |
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| CN104700709A true CN104700709A (en) | 2015-06-10 |
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