HGL-3.2.0.2: A simple graphics library based on X11 or Win32 Source code Contents Index

Graphics.HGL.Draw.Monad Portability non-portable (requires concurrency) Stability provisional Maintainer libraries@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 () Source

An abstract representation of an image.

data Draw a Source

Monad for sequential construction of images.

ioToDraw :: IO a -> Draw a Source

Embed an IO action in a drawing action.

bracket Source

:: => Draw a a post-operation, to be performed on exit from the bracket, whether normal or by an exception. -> a -> Draw b the drawing action inside the bracket. -> a -> Draw c -> Draw c Wrap a drawing action in initialization and finalization actions.

bracket_ Source

:: => Draw a a post-operation, to be performed on exit from the bracket, whether normal or by an exception. -> a -> Draw b the drawing action inside the bracket. -> Draw c -> 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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