gtk-0.12.4: Binding to the Gtk+ graphical user interface library.

Portability	portable (depends on GHC)
Stability	provisional
Maintainer	gtk2hs-users@lists.sourceforge.net
Safe Haskell	None

Graphics.UI.Gtk.Gdk.Region

Description

A set of rectangles describing areas to be redrawn.

Regions consist of a set of non-overlapping rectangles. They are used to specify the area of a window which needs updating.

Synopsis

Documentation

makeNewRegion :: Ptr Region -> IO Region Source

newtype Region Source

Constructors

Region (ForeignPtr Region)

Instances

regionNew :: IO Region Source

Create an empty region.

data FillRule Source

Specify how to interpret a polygon.

The flag determines what happens if a polygon has overlapping areas.

Constructors

EvenOddRule
WindingRule

Instances

regionPolygon :: [Point] -> FillRule -> IO Region Source

Convert a polygon into a Region.

regionCopy :: Region -> IO Region Source

Copy a Region.

regionRectangle :: Rectangle -> IO Region Source

Convert a rectangle to a Region.

regionGetClipbox :: Region -> IO Rectangle Source

Smallest rectangle including the Region.

regionGetRectangles :: Region -> IO [Rectangle]Source

Turn the Region into its rectangles.

A Region is a set of horizontal bands. Each band consists of one or more rectangles of the same height. No rectangles in a band touch.

regionEmpty :: Region -> IO Bool Source

Test if a Region is empty.

regionEqual :: Region -> Region -> IO Bool Source

Compares two Regions for equality.

regionPointIn :: Region -> Point -> IO Bool Source

Checks if a point it is within a region.

data OverlapType Source

How a rectangle is contained in a Region.

Constructors

OverlapRectangleIn
OverlapRectangleOut
OverlapRectanglePart

Instances

Enum OverlapType

regionRectIn :: Region -> Rectangle -> IO OverlapType Source

Check if a rectangle is within a region.

regionOffset :: Region -> Int -> Int -> IO ()Source

Move a region.

regionShrink :: Region -> Int -> Int -> IO ()Source

Move a region.

Positive values shrink the region, negative values expand it.

regionUnionWithRect :: Region -> Rectangle -> IO ()Source

Updates the region to include the rectangle.

regionIntersect :: Region -> Region -> IO ()Source

Intersects one region with another.

Changes reg1 to include the common areas of reg1 and reg2.

regionUnion :: Region -> Region -> IO ()Source

Unions one region with another.

Changes reg1 to include reg1 and reg2.

regionSubtract :: Region -> Region -> IO ()Source

Removes pars of a Region.

Reduces the region reg1 so that is does not include any areas of reg2.

regionXor :: Region -> Region -> IO ()Source

XORs two Regions.

The exclusive or of two regions contains all areas which were not overlapping. In other words, it is the union of the regions minus their intersections.