src/RMCA/GUI/Shapes.hs

   1 module RMCA.GUI.Shapes where
   2
   3 import Graphics.Rendering.Cairo
   4
   5 -- Draws a regular hexagon
   6 --
   7 -- Colors are given in RGB format, coefficient goes from 0 to 1
   8 hexagon :: (Double, Double, Double) -- Background color
   9         -> (Double, Double, Double) -- Frame color
  10         -> (Double, Double) -- Center
  11         -> Double -- Width
  12         -> Render ()
  13 hexagon (backR, backG, backB) (frameR, frameG, frameB) (x,y) w = do
  14   setSourceRGB frameR frameG frameB
  15   setLineWidth (0.01 * w)
  16
  17   let a = 0.5*w
  18       b = 0.87*w
  19
  20   moveTo (x+a) (y-b)
  21   lineTo (x-a) (y-b)
  22   lineTo (x-w) y
  23   lineTo (x-a) (y+b)
  24   lineTo (x+a) (y+b)
  25   lineTo (x+w) y
  26   closePath
  27   strokePreserve
  28   setSourceRGB backR backG backB
  29   fill
  30   return ()
  31
  32 pnw = 200
  33 pnh = 200
  34
  35 main = withImageSurface FormatARGB32 pnw pnh
  36   (\srf -> do renderWith srf (hexagon (1,1,1) (0,0,0)
  37                               (fromIntegral pnw/2,fromIntegral pnh/ 2) (fromIntegral (pnw `quot` 2)))
  38               surfaceWriteToPNG srf "myDraw.png")