Graphics Libraries (HGL package)Source codeContentsIndex
Graphics.HGL.Draw.Monad
Portabilitynon-portable (requires concurrency)
Stabilityprovisional
Maintainerlibraries@haskell.org
Description
The Draw monad, with graphical objects as a special case.
Synopsis
type Graphic = Draw ()
data Draw a
ioToDraw :: IO a -> Draw a
bracket :: Draw a -> (a -> Draw b) -> (a -> Draw c) -> Draw c
bracket_ :: Draw a -> (a -> Draw b) -> Draw c -> Draw c
Documentation
type Graphic = Draw ()
An abstract representation of an image.
data Draw a
Monad for sequential construction of images.
show/hide Instances
ioToDraw :: IO a -> Draw a
Embed an IO action in a drawing action.
bracket
:: Draw aa pre-operation, whose value is passed to the other two components.
-> (a -> Draw b)a post-operation, to be performed on exit from the bracket, whether normal or by an exception.
-> (a -> Draw c)the drawing action inside the bracket.
-> Draw c
Wrap a drawing action in initialization and finalization actions.
bracket_
:: Draw aa pre-operation, whose value is passed to the other two components.
-> (a -> Draw b)a post-operation, to be performed on exit from the bracket, whether normal or by an exception.
-> Draw cthe drawing action inside the bracket.
-> Draw c
A variant of bracket in which the inner drawing action does not use the result of the pre-operation.
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