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TWEET  # Untitled a guest Nov 20th, 2015 19 Never
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1. -- This function calculates the distance and bearing between two points - SAFE TO USE ON IPHONE
2. -- @param:
3. --      point1: ZonePoint
4. --      point2: ZonePoint
5. -- @return
6. --      dist: Wherigo.Distance
7. --      brg: bearing (degree)
8. function VectorToPointSafeToUseOniPhone(point1, point2)
9.
11.
12.     local lat1 = math.rad( point1.latitude )
13.     local lat2 = math.rad( point2.latitude )
14.
15.     local lon1 = math.rad( point1.longitude )
16.     local lon2 = math.rad( point2.longitude )
17.
18.     local p1 = math.cos(lat1) * math.cos(lon1) * math.cos(lat2) * math.cos(lon2)
19.     local p2 = math.cos(lat1) * math.sin(lon1) * math.cos(lat2) * math.sin(lon2)
20.     local p3 = math.sin(lat1) * math.sin(lat2)
22.     local dist = Wherigo.Distance(distance,'m')
23.
24.     local dLon = math.rad( point2.longitude-point1.longitude)
25.     local y = math.sin(dLon) * math.cos(lat2)
26.     local x = math.cos(lat1)* math.sin(lat2) - math.sin(lat1) * math.cos(lat2) * math.cos(dLon)
27.     local brg = math.deg(math.atan2(y, x))
28.
29.     if brg < 0 then
30.         brg = brg + 360
31.     end
32.
33.     return dist, brg
34. end
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