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Just another update

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Ingy döt Net 2015-02-20 00:35:01 -05:00
parent a25938f123
commit 00a190b0a6
6591 changed files with 94363 additions and 23227 deletions
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8
Task/Bitmap-Bresenhams-line-algorithm/Clojure/bitmap-bresenhams-line-algorithm.clj
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@ -1,20 +1,20 @@
(defn draw-line
"Draw a line from x1,y1 to x2,y2 using Bresenham's, to a java BufferedImage in the colour of pixel."
[buffer x1 y1 x2 y2 pixel]
(let [dist-x (abs (- x1 x2))
dist-y (abs (- y1 y2))
(let [dist-x (Math/abs (- x1 x2))
dist-y (Math/abs (- y1 y2))
steep (> dist-y dist-x)]
(let [[x1 y1 x2 y2] (if steep [y1 x1 y2 x2] [x1 y1 x2 y2])]
(let [[x1 y1 x2 y2] (if (> x1 x2) [x2 y2 x1 y1] [x1 y1 x2 y2])]
(let [delta-x (- x2 x1)
delta-y (abs (- y1 y2))
delta-y (Math/abs (- y1 y2))
y-step (if (< y1 y2) 1 -1)]
(let [plot (if steep
#(.setRGB buffer (int %1) (int %2) pixel)
#(.setRGB buffer (int %2) (int %1) pixel))]
(loop [x x1 y y1 error (floor delta-x 2) ]
(loop [x x1 y y1 error (Math/floor (/ delta-x 2)) ]
(plot x y)
(if (< x x2)
; Rather then rebind error, test that it is less than delta-y rather than zero