Level operators

setLevel :: Level a -> a -> IO a

change the Level value, causing the Picture representation to be altered, if needed.

getLevel :: Level a -> IO a

return current Level value.

setLevelCoord :: Level a -> Coord -> IO ()

convert a coordinate within the Level display into its corresponding value within the the Level's interval.

incLevel :: Enum a => Level a -> IO a

decLevel :: Enum a => Level a -> IO a

move the current level up or down by one.

setLevelInterval :: Enum a => Level a -> (a,a) -> IO ()

getLevelInterval :: Enum a => Level a -> IO (a,a)

query and change the current interval. If the interval changes such that the current value falls outside, the value will be set to the closest boundary value.

getLevelGauge :: Level a -> Gauge a

return a Gauge view of the Level.