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polygons #92

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eed457e
calculate perimeter in clj
fabriciorby Sep 13, 2024
d400618
calculate area in clj
fabriciorby Sep 13, 2024
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9 changes: 9 additions & 0 deletions 1 - Introduction/24 - Compute the Perimeter of a Polygon/fabriciorby.clj
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Original file line number Diff line number Diff line change
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(defn euclidian-distance [[[x1 y1] [x2 y2]]]
(Math/sqrt (+ (Math/pow (- x1 x2) 2) (Math/pow (- y1 y2) 2))))

(def points (repeatedly (read-string (read-line))
#(map read-string (.split (read-line) " "))))

(println (->> (partition 2 1 points points)
(map euclidian-distance)
(reduce +)))
9 changes: 9 additions & 0 deletions 1 - Introduction/25 - Compute the Area of a Polygon/fabriciorby.clj
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
(defn quadrilateral-area [[[x1 y1] [x2 y2]]]
(* (- (* x1 y2) (* x2 y1)) 0.5))

(def points (repeatedly (read-string (read-line))
#(map read-string (.split (read-line) " "))))

(println (->> (partition 2 1 points points)
(map quadrilateral-area)
(reduce +)))