Some useful picture combinators

Here are some derived picture combinators, see `PicLib.lhs' for the complete list provided:

line :: Coord -> Coord -> Picture

draw a line between point p1 and p2 using the current pen.

rline :: Size -> Picture

draw line segment with delta (dx,dy).

polyline :: [Coord] -> Picture

draw a polyline, connecting the points in the list ls.

rpolyline :: [Translation] -> Picture

draw a polyline, specified relatively.

ellipse :: Size -> Picture

circle :: Unit -> Picture

draw a circle with radius r.

placeAt :: Coord -> Picture -> Picture

translate Picture pic to position pos.

square :: Int -> Picture

return a Picture of a square.

overlayAt :: Coord -> Picture -> Picture -> Picture

translate Picture picA to position pos and overlay with picB.

noverlay :: [Picture] -> Picture

overlay n Pictures, preserving the ordering of the list.

coverlay :: Picture -> Picture -> Picture

centre both pictures before overlaying their (new) origins.

cnoverlay :: [Picture] -> Picture

n-ary version of the above operation.

beside :: Picture -> Picture -> Picture

construct new picture by horisontally aligning two pictures, centred vertically.

nbeside :: [Picture] -> Picture

horisontally arrange a collection of Pictures, left to right.

above :: Picture -> Picture -> Picture

nabove :: [Picture] -> Picture

same as for beside, this time vertical.

scale :: Scaling -> Picture -> Picture

rotate :: Degrees -> Picture -> Picture

rotate_rad :: Rotation -> Picture -> Picture

translate :: Translation -> Picture -> Picture

invisRect :: Size -> Picture

fillSolid :: Picture -> Picture

centre :: Picture -> Picture

centreH :: Picture -> Picture

centreV :: Picture -> Picture

moveAnchor :: CompassDirection -> Picture -> Picture

moveLeft :: Picture -> Picture

moveRight :: Picture -> Picture

moveTop :: Picture -> Picture

moveBottom :: Picture -> Picture

movePropH :: FUnit -> Picture -> Picture

movePropV :: FUnit -> Picture -> Picture

moveProp :: FSize -> Picture -> Picture

moveNorth,moveNorthEast :: Picture -> Picture

moveEast, moveSouthEast :: Picture -> Picture

moveSouth,moveSouthWest :: Picture -> Picture

moveWest, moveNorthWest :: Picture -> Picture

flipV,flipH :: Picture -> Picture

-- shortcuts to setting the foreground & bground colours.

withColour :: Colour -> Picture -> Picture

withBground :: Colour -> Picture -> Picture

-- font setting shortcuts

withFont :: [FontAttr] -> Picture -> Picture