CN101859554A - Method and device for determining screen display mode - Google Patents
Method and device for determining screen display mode Download PDFInfo
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- CN101859554A CN101859554A CN200910131260A CN200910131260A CN101859554A CN 101859554 A CN101859554 A CN 101859554A CN 200910131260 A CN200910131260 A CN 200910131260A CN 200910131260 A CN200910131260 A CN 200910131260A CN 101859554 A CN101859554 A CN 101859554A
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Abstract
The embodiment of the invention provides a method and a device for determining a screen display mode, and solves the problems of an inconvenient manual switching mode and an automatic switching mode in the prior art. The method comprises the following steps of: determining local longitude and latitude and current date; determining a sunrise time and a sunset time according to the local longitude and latitude and the current date; and then determining the screen display mode according to the sunrise time, the sunset time and the present time. According to the embodiment of the invention, the screen display mode is determined by determining the sunrise time and the sunset time according to the local longitude and latitude and the present date, so that the screen display mode basically accords with the actual situation.
Description
Technical field
The present invention relates to a kind of handoff technique, relate in particular to a kind of screen display mode and determine method and apparatus.
Background technology
In order to protect people's eyesight, promote visual effect, there is the screen pattern handoff functionality in the navigating instrument of present use at map picture.Described screen pattern comprises day mode and Night.Switching mode is the manual switchover and the two kinds of forms that automatically switch.
The manual switchover pattern is according to extraneous circumstance screen pattern to be set manually.For example, when night, be set to Night by manual screen pattern; In the time of by day, be set to day mode by manual screen pattern.
When selecting automatic switching mode, system will switch automatically according to GPS (Global Positioning System, the GPS) time.For example, the current time between at sunrise before, and after the sunset time time, automatically screen display mode is set at Night; Current time between at sunrise after, and before sunset time the time, automatically screen display mode is set at day mode.
From the above, the manual switchover mode is relatively more inconvenient, needs image switching, enters the map display interface and operates.If travel on the road of road surface situation complexity or in the process of running at high speed, will produce danger when carrying out manual operation.
For automatic switching mode, because the unified employing of China is Beijing standard time, promptly the Dong Ba district constantly.And China is vast in territory, across 5 time zones of Dong Wu district to the Dong Jiu district.Each time zone enters the hours of darkness and differed successively 1 hour.Unified to adopt a time be separation round the clock, will occur and the contrary situation of external environment.Such as: when navigating instrument is to judge when demarcating standard round the clock with Beijing time, if the Beijing area enters night in 18:00, then 18 the time, navigating instrument automatically switches to the pattern at night.If but this moment, the user was positioned at the Urumqi City, Xinjiang, and there is the time difference about 2 hours in this city and Beijing, thus really enter the time at night can be than Beijing time late about 2 hours, promptly just begin about Beijing time 20:00 to enter night.So just cause under the also very bright situation of external environment, navigating instrument has but automatically switched to the pattern at night.
In addition, along with replacing of season, the day and night variation of length, it is also respectively different that identical area begins to enter the time at night in the different times.
In automatic switching mode, also have another technical scheme at present, promptly system according to the illumination sign of current vehicle judge show daytime or night pattern.Car light is opened and then is shown as the pattern at night, and car light cuts out and then is shown as day mode.Yet this scheme has solved with certain time point and has been the marginal weak point of mode switch round the clock, but needs the support of external hardware.Precondition is to possess such hardware device.This hardware device feeds back to the on off state of car light on the navigating instrument, and navigating instrument is judged and the pattern round the clock that automaticallyes switch according to the information that receives again.This scheme certainly will increase the cost that adds of navigating instrument, and can't go up realization at hand-held PND (Portable Navigation Devices, Portable Automatic navigational system) and cell phone map navigation.
Summary of the invention
Embodiments of the invention provide a kind of screen display mode to determine method and apparatus, can solve the problem that exists in manual switchover mode inconvenience in the prior art and the automatic switching mode.
Embodiments of the invention provide a kind of screen display mode to determine method, comprising:
Determine local longitude, latitude and date on the same day;
Between determining at sunrise according to longitude, latitude and date on the same day and sunset time;
According between at sunrise, sunset time and current time determine screen display mode.
Embodiments of the invention also provide a kind of screen display mode to determine device, comprising:
First determining unit is used for determining local longitude, latitude and date on the same day;
Second determining unit is between being used for determining at sunrise according to longitude, latitude and date on the same day and sunset time;
The 3rd determining unit, be used for according between at sunrise, sunset time and current time determine screen display mode.
According to the embodiment of the invention, by the longitude and latitude of locality, the date was determined sunrise and sunset time at that time, thereby determine screen display mode, make screen display mode conform to substantially with actual conditions.
Description of drawings
Fig. 1 shows the flow process of the apparent changing method of screen of the embodiment of the invention;
The screen that Fig. 2 shows the embodiment of the invention shows switching device shifter.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing in conjunction with the accompanying drawings for the ease of persons skilled in the art.
Embodiment one
As shown in Figure 1, present embodiment provides a kind of screen display mode to determine method, comprises the steps:
When screen display mode is first kind, be screen display mode when comprising day mode, Night, according between at sunrise, sunset time and current time determine that the method for screen display mode is as follows, the current time between at sunrise before, and in the time of after sunset time, screen display mode is set at Night; Current time between at sunrise after, and before sunset time the time, screen display mode is set day mode.
When screen display mode is second kind, be that screen display mode is when comprising day mode, Night and transition mode, according between at sunrise, sunset time and current time determine that the screen display mode method is as follows, current time adds before first schedule time between at sunrise, and when sunset time adds after second schedule time, screen display mode is set at Night; Within first schedule time of current time before between at sunrise, in the time of perhaps in second schedule time after sunset time, screen display mode is set at transition mode; Current time between at sunrise after, and before sunset time the time, screen display mode is set at day mode.Described first schedule time and second schedule time can be set at 30 minutes respectively, also transition mode can be further divided into two kinds of patterns:
Dusk pattern and dawn pattern, before sunrise, in first schedule time screen display mode is set at the pattern at dawn; In second schedule time screen display mode is set at the pattern at dusk at post sunset.Like this, by increasing transition mode, make the switching between day mode and the Night seem more level and smooth.Thereby help vision protection.
Describe below between determining at sunrise according to longitude, latitude and date on the same day and the method for sunset time.In the formula below, the date in the date is used year respectively, month, and day represents.Longitude, latitude represent local longitude and latitude (number of degrees value).Zenith is the zenith angle of the sun, and among the people is 90.83 degree, and official is 96 degree, and navigation is 102 degree, and uranology is 108 degree, and adopt 90.83 degree among the people here.In addition, in the formula east longitude be on the occasion of, west longitude is a negative value.
(1) at first calculates the fate N (that is, an annual control N days) on the same day
N1＝floor(275*month/9)
N2＝floor((month+9)/12)
N3＝(1+floor((year-4*floor(year/4)+2)/3))
N＝N1-(N2*N3)+day-30
(2) longitude is converted to one hour value IngHour, and calculate a rough time t
lngHour＝longitude/15
Between calculating at sunrise if desired:
t＝N+((6-lngHour)/24)
Calculate sunset time if desired:
t＝N+((18-lngHour)/24)
(3) the mean anomaly M of the calculating sun
M＝(0.9856*t)-3.289
(4) the true longitude L of the calculating sun
L＝M+(1.916*sin(M))+(0.020*sin(2*M))+282.634
Attention: need here by adding/deduct 360 the value of L to be adjusted to [0,360).
(5) the right ascension RA of the calculating sun
RA＝atan(0.91764*tan(L))
Attention: need here by adding/deduct 360 the value of RA to be adjusted to [0,360).
(6) value of right ascension RA must be positioned at same quadrant with L
Lquadrant＝(floor(L/90))*90
RAquadrant＝(floor(RA/90))*90
RA＝RA+(Lquadrant-RAquadrant)
(7) value of right ascension RA must convert to hour
RA＝RA/15
(8) declination of the calculating sun
sinDec＝0.39782*sin(L)
cosDec＝cos(asin(sinDec))
(9) local hour angle of the calculating sun
cosH＝(cos(zenith)-(sinDec*sin(latitude)))/(cosDec*cos(latitude))
If cosH＞1, then the locality does not have sunrise (in specific period).
If cosH＜-1, then the locality does not have sunset (in specific period).
(10) finish the calculating of H, and convert to hour
Between calculating at sunrise if desired:
H＝360-acos(cosH)
Calculate sunset time if desired:
H＝acos(cosH)
Convert to hour:
H＝H/15
(11) calculate the mean time T of local sunrise/sunset
T＝H+RA-(0.06571*t)-6.622
(12) be adjusted to standard time UT
UT＝T-lngHour
Attention: need here the value of UT to be adjusted to [0,24] by adding/deduct 24.
(13) the UT value is converted to standard time of local time zone
LocalT=UT+localOffset (time zone difference)
Below, we lift Chengdu, Sichuan (E104.08 ° N30.66 °) and are example, and the time is on August 11st, 2008).As follows between calculating at sunrise according to above-mentioned formula with sunset time:
(1) at first calculates the fate N (that is, an annual control N days) on the same day
N1＝floor(275*month/9)
＝floor(275*8/9)
＝244
N2＝floor((month+9)/12)
＝floor((8+9)/12)
＝1
N3＝(1+floor((year-4*floor(year/4)+2)/3))
＝(1+floor((2008-4*floor(2008/4)+2)/3))
＝1
N＝N1-(N2*N3)+day-30
＝244-(1*1)+11-30
＝224
(2) longitude is converted to one hour value IngHour, and calculate a rough time t
lngHour＝longitude/15
＝104.08/15
＝6.987
In the time of between calculating at sunrise:
t＝N+((6-lngHour)/24)
＝224+((6-6.987)/24)
＝223.959
(3) the mean anomaly M of the calculating sun
M＝(0.9856*t)-3.289
＝(0.9856*223.959)-3.289
＝217.445
(4) the true longitude L of the calculating sun
L＝M+(1.916*sin(M))+(0.020*sin(2*M))+282.634
＝
217.445+(1.916*sin(217.445))+(0.020*sin(2*217.445))+282.634
＝498.933
For making the L value belong to [0,360], need deduct 360, then L=498.933-360=138.933.
(5) the right ascension RA of the calculating sun
RA＝atan(0.91764*tan(L))
＝atan(0.91764*tan(138.933))
＝-38.645
For making the L value belong to [0,360], need add 360, then RA=-38.645+360=321.355.
(6) value of right ascension RA must be positioned at same quadrant with L
Lquadrant＝(floor(L/90))*90
＝(floor(138.933/90))*90
＝90
RAquadrant＝(floor(RA/90))*90
＝(floor(321.355/90))*90
＝270＝-90
RA＝RA+(Lquadrant-RAquadrant)
＝-38.645+(90+90)
＝141.355
(7) value of right ascension RA must convert to hour
RA＝RA/15＝9.424
(8) declination of the calculating sun
sinDec＝0.39782*sin(L)
＝0.39782*sin(138.933)
＝0.261
cosDec＝cos(asin(sinDec))
＝cos(asin(0.261))
＝0.965
(9) local hour angle of the calculating sun
cosH＝(cos(zenith)-(sinDec*sin(latitude)))/(cosDec*cos(latitude))
＝(cos(90.83)-(0.261*sin(30.66)))/(0.965*cos(30.66))
＝-0.178
Relatively-0.178 fall within [1,1], then there is the sunrise phenomenon on this ground.
(10) finish the calculating of H, and convert to hour
Between calculating at sunrise:
H＝360-acos(cosH)
＝360-acos(-0.178)
＝259.750
Convert to hour:
H＝H/15＝17.317
(11) calculate the mean time T of local sunrise/sunset
T＝H+RA-(0.06571*t)-6.622
＝17.317+9.424-(0.06571*223.959)-6.622
＝5.402
(12) be adjusted to standard time UT
UT＝T-lngHour
＝5.402-6.987
＝-1.585
For making the UT value belong to [0,24], need add 24, then RA=-1.585+24=22.415.
(13) the UT value is converted to standard time of local time zone
LocalT=UT+localOffset (time zone difference, Beijing time is+8)
＝22.415+8
＝30.415
Promptly 6.415, the time of converting to is 6:25.Area, 11, Chengdu in promptly 2008 on August at sunrise between.
Next, in like manner calculate sunset time.
(1) at first calculates the fate N (that is, an annual control N days) on the same day
N1＝floor(275*month/9)
＝floor(275*8/9)
＝244
N2＝floor((month+9)/12)
＝floor((8+9)/12)
＝1
N3＝(1+floor((year-4*floor(year/4)+2)/3))
＝(1+floor((2008-4*floor(2008/4)+2)/3))
＝1
N＝N1-(N2*N3)+day-30
＝244-(1*1)+11-30
＝224
(2) longitude is converted to one hour value IngHour, and calculate a rough time t
lngHour＝longitude/15
＝104.08/15
＝6.987
When calculating sunset time:
t＝N+((18-lngHour)/24)
＝224+((18-6.987)/24)
＝224.459
(3) the mean anomaly M of the calculating sun
M＝(0.9856*t)-3.289
＝(0.9856*224.459)-3.289
＝217.938
(4) the true longitude L of the calculating sun
L＝M+(1.916*sin(M))+(0.020*sin(2*M))+282.634
＝
217.938+(1.916*sin(217.938))+(0.020*sin(2*217.938))+282.634
＝499.413
For making the L value belong to [0,360], need deduct 360, then L=499.413-360=139.413.
(5) the right ascension RA of the calculating sun
RA＝atan(0.91764*tan(L))
＝atan(0.91764*tan(139.413))
＝-38.173
For making the RA value belong to [0,360], need add 360, then RA=-38.173+360=321.827.
(6) value of right ascension RA must be positioned at same quadrant with L
Lquadrant＝(floor(L/90))*90
＝(floor(139.413/90))*90
＝90
RAquadrant＝(floor(RA/90))*90
＝(floor(321.827/90))*90
＝270＝-90
RA＝RA+(Lquadrant-RAquadrant)
＝-38.173+(90+90)
＝141.827
(7) value of right ascension RA must convert to hour
RA＝RA/15＝9.455
(8) declination of the calculating sun
sinDec＝0.39782*sin(L)
＝0.39782*sin(139.413)
＝0.259
cosDec＝cos(asin(sinDec))
＝cos(asin(0.259))
＝0.966
(9) local hour angle of the calculating sun
cosH＝(cos(zenith)-(sinDec*sin(latitude)))/(cosDec*cos(latitude))
＝(cos(90.83)-(0.259*sin(30.66)))/(0.966*cos(30.66))
＝-0.176
Relatively-0.176 fall within [1,1], then there is setting sun phenomenon on this ground.
(10) finish the calculating of H, and convert to hour
Calculate sunset time:
H＝acos(cosH)
＝acos(-0.176)
＝100.153
Convert to hour:
H＝H/15＝6.677
(11) calculate the mean time T of local sunrise/sunset
T＝H+RA-(0.06571*t)-6.622
＝6.6777+9.455-(0.06571*224.459)-6.622
＝-5.239
(12) be adjusted to standard time UT
UT＝T-lngHour
＝-5.239-6.987
＝-12.226
For making the UT value belong to [0,24], need add 24, then RA=-12.226+24=11.774.
(13) the UT value is converted to standard time of local time zone
LocalT=UT+localOffset (time zone difference, Beijing time is+8)
＝11.774+8
＝19.774
The time of converting to is 19:46.The sunset time in area, 11, Chengdu in promptly 2008 on August.
Embodiment two
As shown in Figure 2, present embodiment provides a kind of screen display mode to determine device, comprising: first determining unit is used for determining local longitude, latitude and date on the same day; Second determining unit is between being used for determining at sunrise according to longitude, latitude and date on the same day and sunset time; The 3rd determining unit, be used for according between at sunrise, sunset time and current time determine screen display mode.
Described screen display mode comprises day mode, Night, and described the 3rd determining unit specifically comprises: the first condition selected cell, be used to judge that the current time is between at sunrise before, and after the sunset time time, start first setup unit; Current time between at sunrise after, and before sunset time the time, start second setup unit, second setup unit is used for screen display mode is set at day mode; First setup unit is used for screen display mode is set at Night; Second setup unit is used for screen display mode is set at day mode.
Described screen display mode comprises day mode, Night and transition mode, described the 3rd determining unit specifically comprises: the second condition selected cell, be used for two and judge that the current time adds before first schedule time between at sunrise, and when sunset time adds after second schedule time, start first setup unit; Within first schedule time of current time before between at sunrise, in the time of perhaps in second schedule time after sunset time, start the 3rd setup unit; Current time between at sunrise after, and before sunset time the time, start second setup unit; First setup unit is used for screen display mode is set at Night; Second setup unit is used for screen display mode is set at day mode; The 3rd setup unit is used for screen display mode is set at transition mode.Described first determining unit is a GPS.
The principle of work of each unit of present embodiment can be with reference to the related content among the embodiment one.
According to the embodiment of the invention, by the longitude and latitude of locality, the date was determined sunrise and sunset time at that time, thereby determine screen display mode, make screen display mode conform to substantially with actual conditions.In addition, the embodiment of the invention has also increased transition mode, and transition mode has dusk, dawn two kinds of patterns, and it is more level and smooth that screen display mode is switched, and more meets objective law.Therefore, the method for definite screen display mode of the embodiment of the invention makes that the present mode of screen display mode and external environment accordance are better, and does not need external other hardware devices.The method of the embodiment of the invention not only can realize on automatic navigator, also all is suitable in hand-held PND and cell phone map navigation.
Though described the present invention by embodiment, those of ordinary skills know, without departing from the spirit and substance in the present invention, just can make the present invention that many distortion and variation are arranged, and scope of the present invention is limited to the appended claims.
Claims (8)
1. a screen display mode is determined method, it is characterized in that, comprising:
Determine local longitude, latitude and date on the same day;
Between determining at sunrise according to longitude, latitude and date on the same day and sunset time;
According between at sunrise, sunset time and current time determine screen display mode.
2. method according to claim 1, it is characterized in that, described screen display mode comprises day mode, Night, described basis at sunrise between, sunset time and current time determine that screen display mode specifically comprises: the current time between at sunrise before, and in the time of after sunset time, screen display mode is set at Night; Current time between at sunrise after, and before sunset time the time, screen display mode is set day mode.
3. method according to claim 1, it is characterized in that, described screen display mode comprises day mode, Night and transition mode, described basis at sunrise between, sunset time and current time determine that screen display mode specifically comprises: the current time adds before first schedule time between at sunrise, and when sunset time adds after second schedule time, screen display mode is set at Night; Within first schedule time of current time before between at sunrise, in the time of perhaps in second schedule time after sunset time, screen display mode is set at transition mode; Current time between at sunrise after, and before sunset time the time, screen display mode is set at day mode.
4. according to one of them described method of claim 1 to 3, it is characterized in that the longitude of described definite locality, latitude are determined by GPS.
5. a screen display mode is determined device, it is characterized in that, comprising:
First determining unit is used for determining local longitude, latitude and date on the same day;
Second determining unit is between being used for determining at sunrise according to longitude, latitude and date on the same day and sunset time;
The 3rd determining unit, be used for according between at sunrise, sunset time and current time determine screen display mode.
6. device according to claim 5 is characterized in that described screen display mode comprises day mode, Night, and described the 3rd determining unit specifically comprises:
The first condition selected cell, be used to judge that the current time is between at sunrise before, and after the sunset time time, start first setup unit; Current time between at sunrise after, and before sunset time the time, start second setup unit, second setup unit is used for screen display mode is set at day mode;
First setup unit is used for screen display mode is set at Night;
Second setup unit is used for screen display mode is set at day mode.
7. device according to claim 5 is characterized in that described screen display mode comprises day mode, Night and transition mode, and described the 3rd determining unit specifically comprises:
The second condition selected cell is used for two and judges that the current time added before first schedule time between at sunrise, and when sunset time adds after second schedule time, starts first setup unit; Within first schedule time of current time before between at sunrise, in the time of perhaps in second schedule time after sunset time, start the 3rd setup unit; Current time between at sunrise after, and before sunset time the time, start second setup unit;
First setup unit is used for screen display mode is set at Night;
Second setup unit is used for screen display mode is set at day mode;
The 3rd setup unit is used for screen display mode is set at transition mode.
8. according to one of them described device of claim 5 to 7, it is characterized in that described first determining unit is a GPS.
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Application publication date: 20101013 |