HGL-3.2.0.5: A simple graphics library based on X11 or Win32

Portabilitynon-portable (requires concurrency)
Stabilityprovisional
Maintainerlibraries@haskell.org
Safe HaskellNone

Graphics.HGL.Draw.Monad

Description

The Draw monad, with graphical objects as a special case.

Synopsis

Documentation

type Graphic = Draw ()Source

An abstract representation of an image.

data Draw a Source

Monad for sequential construction of images.

Instances

ioToDraw :: IO a -> Draw aSource

Embed an IO action in a drawing action.

bracketSource

Arguments

:: Draw a

a 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_Source

Arguments

:: Draw a

a 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 c

the 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.