PicMisc - misc. picture operators

The PicMisc module defines various operators that come in handy once in a while:

 {- A ResizeablePicture is a function that may produce
    a different picture depending on the size it should
    be displayed at.
 -}
type ResizeablePicture = Size -> Picture

 {-
   create a pie given the radius and a list of samples
   giving the sizes of the slices
 -}
pie		:: Unit -> [Unit] -> Picture

 {- translate a picture using polar coordinates -}
translatePolar	:: (Unit,Rotation) -> Picture -> Picture
 {- fill the picture or not -}
fillPicture	:: Picture -> Picture	
noFillPicture	:: Picture -> Picture

 {- filled circles and rectangles -}
fcircle	        :: Unit -> Picture
frectangle      :: Unit -> Picture

 {- return picture of an arrowed line with a filled triangle arrow -}
leftArrow       :: Unit -> Picture
rightArrow      :: Unit -> Picture
upArrow         :: Unit -> Picture
downArrow       :: Unit -> Picture

 {- pictures of triangles (not filled), argument gives length of sides. -}
leftTriangle    :: Unit -> Picture
rightTriangle   :: Unit -> Picture
downTriangle    :: Unit -> Picture
upTriangle      :: Unit -> Picture

 {- combinators for emedding a picture inside
    an oval or rectangular box 
 -}
ovalBox         :: Picture -> Picture
rectBox         :: String  -> Picture

 {- arrange a label within a `frame' picture. -}
overlayAnchor   :: Picture  -- the frame
                -> Size     -- internal padding/border width
                -> Picture  -- label
                -> CompassDirection  --anchor point for label
                -> Picture  -- label overlaid at anchor point within frame