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Last change
on this file since 4558 was
2696,
checked in by kanani, 7 years ago
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Merge of branch palm4u into trunk
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File size:
469 bytes
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| 1 | void Update_SUN() |
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| 2 | { |
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| 3 | KPP_REAL SunRise, SunSet; |
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| 4 | KPP_REAL Thour, Tlocal, Ttmp; |
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| 5 | const KPP_REAL PI = 3.14159265358979; |
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| 6 | |
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| 7 | SunRise = 4.5; |
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| 8 | SunSet = 19.5; |
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| 9 | Thour = TIME/3600.0; |
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| 10 | Tlocal = Thour - ((int)Thour/24)*24; |
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| 11 | |
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| 12 | if ( (Tlocal >= SunRise) && (Tlocal <= SunSet) ) { |
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| 13 | Ttmp = (2.0*Tlocal-SunRise-SunSet)/(SunSet-SunRise); |
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| 14 | if (Ttmp > 0) Ttmp = Ttmp*Ttmp; |
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| 15 | else Ttmp = -Ttmp*Ttmp; |
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| 16 | SUN = ( 1.0 + cos(PI*Ttmp) )/2.0; |
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| 17 | } else { |
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| 18 | SUN=0.0; |
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| 19 | } |
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| 20 | } |
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