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gloss/gloss-examples/picture/Tree/Main.hs
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-- | Tree Fractal. | |
-- Based on ANUPlot code by Clem Baker-Finch. | |
-- | |
module Main where | |
import Graphics.Gloss | |
main :: IO () | |
main = animate (InWindow "Tree" (500, 650) (20, 20)) | |
black (picture 4) | |
-- The picture is a tree fractal, graded from brown to green | |
picture :: Int -> Float -> Picture | |
picture degree time | |
= Translate 0 (-300) | |
$ tree degree time (dim $ dim brown) | |
-- Basic stump shape | |
stump :: Color -> Picture | |
stump color | |
= Color color | |
$ Polygon [(30,0), (15,300), (-15,300), (-30,0)] | |
-- Make a tree fractal. | |
tree :: Int -- Fractal degree | |
-> Float -- time | |
-> Color -- Color for the stump | |
-> Picture | |
tree 0 time color = stump color | |
tree n time color | |
= let smallTree | |
= Rotate (sin time) | |
$ Scale 0.5 0.5 | |
$ tree (n-1) (- time) (greener color) | |
in Pictures | |
[ stump color | |
, Translate 0 300 $ smallTree | |
, Translate 0 240 $ Rotate 20 smallTree | |
, Translate 0 180 $ Rotate (-20) smallTree | |
, Translate 0 120 $ Rotate 40 smallTree | |
, Translate 0 60 $ Rotate (-40) smallTree ] | |
-- A starting colour for the stump | |
brown :: Color | |
brown = makeColorI 139 100 35 255 | |
-- Make this color a little greener | |
greener :: Color -> Color | |
greener c = mixColors 1 10 green c | |