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Log axis with custom range #145

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Log axis with custom range #145

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29 changes: 21 additions & 8 deletions chart/Graphics/Rendering/Chart/Axis/Floating.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@ module Graphics.Rendering.Chart.Axis.Floating(
LogAxisParams(..),
scaledAxis,
autoScaledAxis,
scaledLogAxis,
autoScaledLogAxis,
autoSteps,

Expand Down Expand Up @@ -185,7 +186,7 @@ data LinearAxisParams a = LinearAxisParams {
}

instance (Show a, RealFloat a) => Default (LinearAxisParams a) where
def = LinearAxisParams
def = LinearAxisParams
{ _la_labelf = showDs
, _la_nLabels = 5
, _la_nTicks = 50
Expand Down Expand Up @@ -248,10 +249,22 @@ autoSteps nSteps vs = map fromRational $ steps (fromIntegral nSteps) r
----------------------------------------------------------------------

instance (Show a, RealFloat a) => Default (LogAxisParams a) where
def = LogAxisParams
def = LogAxisParams
{ _loga_labelf = showDs
}

-- | Generate a log axis with the specified bounds.
scaledLogAxis :: RealFloat a => LogAxisParams a -> (a,a) -> AxisFn a
scaledLogAxis lap (lower,upper) ps0 =
makeAxis' (realToFrac . log) (realToFrac . exp)
(_loga_labelf lap) (wrap rlabelvs, wrap rtickvs, wrap rgridvs)
where
minV = if isValidNumber lower && 0 < lower then lower else 3
maxV = if isValidNumber upper && minV < upper then upper else 10 * minV
wrap = map fromRational
(rlabelvs, rtickvs, rgridvs) =
logTicks (realToFrac minV, realToFrac maxV)

-- | Generate a log axis automatically, scaled appropriate for the
-- input data.
autoScaledLogAxis :: RealFloat a => LogAxisParams a -> AxisFn a
Expand Down Expand Up @@ -298,17 +311,17 @@ logTicks (low,high) = (major,minor,major)
maximum (1:filter (\x -> log10 (fromRational x) <= r) l)*10^^i
upper a l = let (i,r) = pf (log10 a) in
minimum (10:filter (\x -> r <= log10 (fromRational x)) l)*10^^i

powers :: (Double,Double) -> [Rational] -> [Rational]
powers (x,y) l = [ a*10^^p | p <- [(floor (log10 x))..(ceiling (log10 y))] :: [Integer]
, a <- l ]
midselection r l = filter (inRange r l) (powers r l)
inRange (a,b) l x = (lower a l <= x) && (x <= upper b l)

logRange = (log10 low, log10 high)

roundPow x = 10^^(round x :: Integer)

major | 17.5 < log10 ratio = map roundPow $
steps (min 5 (log10 ratio)) logRange
| 12 < log10 ratio = map roundPow $
Expand All @@ -325,8 +338,8 @@ logTicks (low,high) = (major,minor,major)
(dl',dh') = (fromRational l', fromRational h')
ratio' :: Double
ratio' = fromRational (h'/l')
filterX = filter (\x -> l'<=x && x <=h') . powers (dl',dh')
filterX = filter (\x -> l'<=x && x <=h') . powers (dl',dh')

minor | 50 < log10 ratio' = map roundPow $
steps 50 (log10 dl', log10 dh')
| 6 < log10 ratio' = filterX [1,10]
Expand Down