Some useful Pen combinators

black,white :: Colour

red,blue :: Colour

green,yellow :: Colour

red :: Colour

rgbColour :: Int -> Int -> Int -> Colour

grey :: Int -> Colour

normalFont :: [FontAttr] -> Pen

xlfdFont :: String -> Pen

getPenFont :: Pen -> PenFont

combineFonts :: [PenFont] -> PenFont

setLineWidth :: Int -> Pen

getPenForeground :: Pen -> Maybe Colour

getPenBackground :: Pen -> Maybe Colour

getPenWidth :: Pen -> Int

getFontSize :: PenFont -> Maybe Int

getPenFontFamily :: PenFont -> Maybe FontFamily

getFontFamily :: PenFont -> FontFamily

getPenFontSlant :: PenFont -> Maybe FontSlant

getFontSlant :: PenFont -> FontSlant

getPenFontWeight :: PenFont -> Maybe FontWeight

getFontWeight :: PenFont -> FontWeight

isInvisible :: Pen -> Bool

isFillPen :: Pen -> Maybe Bool

combinePens :: [Pen] -> Pen

setForeground :: Colour -> Pen -> Pen

setBackground :: Colour -> Pen -> Pen

combinePen :: Pen -> Pen -> Pen

penDiff :: Pen -> Pen -> (Pen,Pen,Pen)