On 09/08/12 12:00, David Powell wrote:
You can try using the multi-input version of map to knit your data
together with some other, potentially infinite, sequence:
(map vector items (cycle [black white]))
It returns something like this:
([item1 black] [item2 white] [item3 black] [item4 white])
Then you can use doseq over that, using destructuring to pick apart
the items and colours and do something appropriate with each of them.
Thanks Dave that is pretty clever and looks very idiomatic! I managed to
get what I by using your suggestion:
(defn draw-grid2 [d g]
(let [w (width d)
h (height d)
tiles (map vector (for [x (range 0 w 50)
y (range 0 h 50)] [x y])
(cycle [java.awt.Color/WHITE
java.awt.Color/BLACK]))]
(doseq [[[x y] c] tiles]
(.setColor g c)
(.fillRect g x y 50 50)) ))
Thanks a lot! It looked impossible to achieve without mutation, indices
and counting pixels!!!
Jim
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