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hs: implement "caijun", or "marstochina" #54

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hs: implement "caijun", or "marstochina" #54

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a685742
hs: implement "caijun"
Artoria2e5 Jan 4, 2018
8efb11c
gcj2WgsExactFix: remove "prev"
Artoria2e5 Apr 18, 2018
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51 changes: 20 additions & 31 deletions haskell/EvilTransform.lhs
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Original file line number Diff line number Diff line change
Expand Up @@ -26,8 +26,8 @@
> i3 = (20.0*sin(x*pi) + 40.0*sin(x/3.0*pi)) * 2.0 / 3.0
> i4 = (150.0*sin(x/12.0*pi) + 300.0*sin(x/30.0*pi)) * 2.0 / 3.0

> delte :: Coordinate -> Coordinate
> delte (lat, lng) = (dLat, dLng)
> delta :: Coordinate -> Coordinate
> delta (lat, lng) = (dLat, dLng)
> where a = 6378137.0
> ee = 0.00669342162296594323
> radLat = lat / 180.0 * pi
Expand All @@ -44,15 +44,15 @@
> | outOfChina wgscoor = wgscoor
> | otherwise = (wglat + dlat, wglng + dlng)
> where (wglat, wglng) = wgscoor
> (dlat, dlng) = delte wgscoor
> (dlat, dlng) = delta wgscoor


> gcj2Wgs :: Coordinate -> Coordinate
> gcj2Wgs gccoor
> | outOfChina gccoor = gccoor
> | otherwise = (gcjLat - dLat, gcjLng - dLng)
> where (gcjLat, gcjLng) = gccoor
> (dLat, dLng) = delte gccoor
> (dLat, dLng) = delta gccoor

> distance :: Coordinate -> Coordinate -> Double
> distance (latA,lngA) (latB, lngB)
Expand All @@ -67,33 +67,22 @@


> gcj2WgsExact :: Coordinate -> Coordinate
> gcj2WgsExact (gcjLat, gcjLng) = gainOn 0 gcjLat gcjLng mLat mLng pLat pLng
> where initDelta = 0.01
> mLat = gcjLat - initDelta
> mLng = gcjLng - initDelta
> pLat = gcjLat + initDelta
> pLng = gcjLng + initDelta
> gcj2WgsExact gcoords = gcj2WgsExactFix 0 gcoords wcoords
> where wcoords = gcj2Wgs gcoords

> gainOn :: Int -- times
> -> Double -- gcjLat
> -> Double -- gcjLng
> -> Double -- mLat
> -> Double -- mLng
> -> Double -- pLat
> -> Double -- pLng
> gcj2WgsExactFix :: Int -- times
> -> Coordinate -- shit
> -> Coordinate -- curr
> -> Coordinate
> gainOn i gcjLat gcjLng mLat mLng pLat pLng
> | i >= 29 = (wgsLat, wgsLng)
> | (lessThanThreshold dLat) && (lessThanThreshold dLng) = (wgsLat, wgsLng)
> | otherwise = let _pLat = if (dLat > 0) then wgsLat else pLat
> _mLat = if (dLat <= 0) then wgsLat else mLat
> _pLng = if (dLng > 0) then wgsLng else pLng
> _mLng = if (dLng <= 0) then wgsLng else mLng
> in gainOn (i+1) gcjLat gcjLng _mLat _mLng _pLat _pLng
> gcj2WgsExactFix i shit curr
> | i >= 29 = curr
> | lessThanThreshold diff = curr
> | otherwise = let curr = subtractCoord curr diff
> in gcj2WgsExactFix (i+1) shit curr
> where threshold = 0.000001
> wgsLat = (mLat + pLat) / 2
> wgsLng = (mLng + pLng) / 2
> (tmpLat, tmpLng) = wgs2Gcj (wgsLat, wgsLng)
> dLat = tmpLat - gcjLat
> dLng = tmpLng - gcjLng
> lessThanThreshold = (\x -> abs(x) < threshold)
> fwdt = wgs2Gcj curr
> diff = subtractCoord fwdt shit
> lessThanThreshold = (\x -> (abs (fst x) < threshold) && (abs (snd x) < threshold))

> subtractCoord :: Coordinate -> Coordinate -> Coordinate
> subtractCoord (a,b) (c,d) = (a-c,b-d)