Implement the GfxText request.

This stops using the Gtk.Color datatype, and adds a setSoureColor to
wrap setSourceRGB and which can be called with our own Color datatype.

diff --git a/FPPrac.hs b/FPPrac.hs
index d8fd94f5c1cf7b6271277c9c2e29dafdb1e029c5..fcbf33e15c00def5e1ada934f01a03d24b340cdc 100644 (file)
--- a/FPPrac.hs
+++ b/FPPrac.hs
@@ -30,13 +30,14 @@ data Rect = Rect
 
 data Point = Point !Int !Int deriving (Show, Eq)
 
-type Color = Gtk.Color
+-- A color, with RGB values from 0 to 1
+data Color = Color Double Double Double deriving (Show, Eq)
 
 -- Create a Color from Red, Green and Blue values. The inputs should be
 -- between 0 and 255 (inclusive).
 rgb :: Int -> Int -> Int -> Color
-rgb r g b = Gtk.Color (conv r) (conv g) (conv b)
-       where conv = fromInteger . toInteger . (*256)
+rgb r g b = Color (conv r) (conv g) (conv b)
+       where conv = (/256) . fromIntegral
 
 -- | Some predefined colours
 red = rgb 0xff 0 0
@@ -277,9 +278,18 @@ gfxHandler IS {..} (GfxDisc      col rt)    = Just $ ellipse buffer rt [penColor
 gfxHandler IS {..} (GfxFont      st  sz)    = Just $ buffer `set` [ fontSize := sz, fontFace := st ]
 gfxHandler IS {..} (GfxPicture   fd  pt)    = Just $ bitmapCreateFromFile fd >>= \bm -> drawBitmap buffer bm pt False [] >> bitmapGetSize bm >>= dirtyRect' sPanel pt
 -}
+gfxHandler' IS {..} (GfxText      col (Point x y) st) = Just $ do
+       setSourceColor col
+       Cairo.moveTo (fromIntegral x) (fromIntegral y)
+       Cairo.showText st 
 gfxHandler' IS {..}  GfxClear                = Just $ Cairo.setSourceRGB 1 1 1 >> Cairo.paint
 gfxHandler' _        _                       = Nothing
 
+-- | Sets the source to a pattern fill of the given color
+setSourceColor :: Color -> Cairo.Render ()
+setSourceColor (Color r g b) =
+       Cairo.setSourceRGB r g b
+
 {-
 dirtyPts :: Window a -> [Point] -> IO ()
 dirtyPts dc ps = dirtyRect' dc (pt x y) Size {..}