Maintainer | gtk2hs-users@lists.sourceforge.net |
---|---|
Stability | provisional |
Portability | portable (depends on GHC) |
Safe Haskell | None |
Language | Haskell98 |
Graphics contexts - objects to encapsulate drawing properties
Synopsis
- data GC
- class GObjectClass o => GCClass o
- castToGC :: GObjectClass obj => obj -> GC
- gTypeGC :: GType
- gcNew :: DrawableClass d => d -> IO GC
- data GCValues = GCValues Color Color Function Fill (Maybe Pixmap) (Maybe Pixmap) (Maybe Pixmap) SubwindowMode Int Int Int Int Bool Int LineStyle CapStyle JoinStyle
- newGCValues :: GCValues
- data Color = Color Word16 Word16 Word16
- foreground :: GCValues -> Color
- background :: GCValues -> Color
- data Function
- function :: GCValues -> Function
- data Fill
- = Solid
- | Tiled
- | Stippled
- | OpaqueStippled
- fill :: GCValues -> Fill
- tile :: GCValues -> Maybe Pixmap
- stipple :: GCValues -> Maybe Pixmap
- clipMask :: GCValues -> Maybe Pixmap
- data SubwindowMode
- subwindowMode :: GCValues -> SubwindowMode
- tsXOrigin :: GCValues -> Int
- tsYOrigin :: GCValues -> Int
- clipXOrigin :: GCValues -> Int
- clipYOrigin :: GCValues -> Int
- graphicsExposure :: GCValues -> Bool
- lineWidth :: GCValues -> Int
- data LineStyle
- lineStyle :: GCValues -> LineStyle
- data CapStyle
- capStyle :: GCValues -> CapStyle
- data JoinStyle
- joinStyle :: GCValues -> JoinStyle
- gcNewWithValues :: DrawableClass d => d -> GCValues -> IO GC
- gcSetValues :: GC -> GCValues -> IO ()
- gcGetValues :: GC -> IO GCValues
- gcSetClipRectangle :: GC -> Rectangle -> IO ()
- gcSetClipRegion :: GC -> Region -> IO ()
- gcSetDashes :: GC -> Int -> [(Int, Int)] -> IO ()
Detail
All drawing operations in Gdk take a graphics context (GC) argument. A graphics context encapsulates information about the way things are drawn, such as the foreground color or line width. By using graphics contexts, the number of arguments to each drawing call is greatly reduced, and communication overhead is minimized, since identical arguments do not need to be passed repeatedly.
Most values of a graphics context can be set at creation time by using
gcNewWithValues
. A few of the values in the GC, such as the dash
pattern, can only be set by the latter method.
Graphics Contexts are removed in Gtk3, so this module is empty.
class GObjectClass o => GCClass o Source #
Instances
GCClass GC Source # | |
Defined in Graphics.UI.Gtk.Types |
castToGC :: GObjectClass obj => obj -> GC Source #
Intermediate data structure for GC
s.
- If
graphicsExposure
is set then copying portions into a drawable will generate an"exposure"
event, even if the destination area is not currently visible.
Removed in Gtk3.
GCValues Color Color Function Fill (Maybe Pixmap) (Maybe Pixmap) (Maybe Pixmap) SubwindowMode Int Int Int Int Bool Int LineStyle CapStyle JoinStyle |
Instances
Storable GCValues Source # | |
Defined in Graphics.UI.Gtk.General.Structs |
Color
- Specifies a color with three integer values for red, green and blue. All values range from 0 (least intense) to 65535 (highest intensity).
Instances
Eq Color | |
Show Color | |
Storable Color # | |
foreground :: GCValues -> Color Source #
background :: GCValues -> Color Source #
Determine how bitmap operations are carried out.
Removed in Gtk3.
Copy | |
Invert | |
Xor | |
Clear | |
And | |
AndReverse | |
AndInvert | |
Noop | |
Or | |
Equiv | |
OrReverse | |
CopyInvert | |
OrInvert | |
Nand | |
Nor | |
Set |
Instances
Enum Function Source # | |
Defined in Graphics.UI.Gtk.Gdk.Enums | |
Eq Function Source # | |
Show Function Source # | |
How objects are filled.
Removed in Gtk3.
data SubwindowMode Source #
Determine if child widget may be overdrawn.
Removed in Gtk3.
Instances
Enum SubwindowMode Source # | visibility of a window |
Defined in Graphics.UI.Gtk.Gdk.Enums succ :: SubwindowMode -> SubwindowMode # pred :: SubwindowMode -> SubwindowMode # toEnum :: Int -> SubwindowMode # fromEnum :: SubwindowMode -> Int # enumFrom :: SubwindowMode -> [SubwindowMode] # enumFromThen :: SubwindowMode -> SubwindowMode -> [SubwindowMode] # enumFromTo :: SubwindowMode -> SubwindowMode -> [SubwindowMode] # enumFromThenTo :: SubwindowMode -> SubwindowMode -> SubwindowMode -> [SubwindowMode] # | |
Eq SubwindowMode Source # | |
Defined in Graphics.UI.Gtk.Gdk.Enums (==) :: SubwindowMode -> SubwindowMode -> Bool # (/=) :: SubwindowMode -> SubwindowMode -> Bool # | |
Show SubwindowMode Source # | |
Defined in Graphics.UI.Gtk.Gdk.Enums showsPrec :: Int -> SubwindowMode -> ShowS # show :: SubwindowMode -> String # showList :: [SubwindowMode] -> ShowS # |
clipXOrigin :: GCValues -> Int Source #
clipYOrigin :: GCValues -> Int Source #
graphicsExposure :: GCValues -> Bool Source #
Determines if a line is solid or dashed.
Removed in Gtk3.
Instances
Enum LineStyle Source # | |
Defined in Graphics.UI.Gtk.Gdk.Enums succ :: LineStyle -> LineStyle # pred :: LineStyle -> LineStyle # fromEnum :: LineStyle -> Int # enumFrom :: LineStyle -> [LineStyle] # enumFromThen :: LineStyle -> LineStyle -> [LineStyle] # enumFromTo :: LineStyle -> LineStyle -> [LineStyle] # enumFromThenTo :: LineStyle -> LineStyle -> LineStyle -> [LineStyle] # | |
Eq LineStyle Source # | |
Show LineStyle Source # | |
Specify the how the ends of a line is drawn.
Removed in Gtk3.
Instances
Enum CapStyle Source # | |
Defined in Graphics.UI.Gtk.Gdk.Enums | |
Eq CapStyle Source # | |
Show CapStyle Source # | |
Instances
Enum JoinStyle Source # | |
Defined in Graphics.UI.Gtk.Gdk.Enums succ :: JoinStyle -> JoinStyle # pred :: JoinStyle -> JoinStyle # fromEnum :: JoinStyle -> Int # enumFrom :: JoinStyle -> [JoinStyle] # enumFromThen :: JoinStyle -> JoinStyle -> [JoinStyle] # enumFromTo :: JoinStyle -> JoinStyle -> [JoinStyle] # enumFromThenTo :: JoinStyle -> JoinStyle -> JoinStyle -> [JoinStyle] # | |
Eq JoinStyle Source # | |
Show JoinStyle Source # | |
gcNewWithValues :: DrawableClass d => d -> GCValues -> IO GC Source #
Creates a graphics context with specific values.
gcSetClipRectangle :: GC -> Rectangle -> IO () Source #
Set a clipping rectangle.
- All drawing operations are restricted to this rectangle. This rectangle is interpreted relative to the clip origin.
gcSetClipRegion :: GC -> Region -> IO () Source #
Set a clipping region.
- All drawing operations are restricted to this region. This region is interpreted relative to the clip origin.
gcSetDashes :: GC -> Int -> [(Int, Int)] -> IO () Source #
Specify the pattern with which lines are drawn.
- Every tuple in the list contains an even and an odd segment. Even
segments are drawn normally, whereby the
lineStyle
member of the graphics context defines if odd segements are drawn or not. Aphase
argument greater than 0 will dropphase
pixels before starting to draw.