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Add point-transform and multiply functions.

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This commit is contained in:
Andrey Antukh 2016-04-05 17:57:16 +03:00
parent 25d76d5b88
commit 4c5e847b11
1 changed files with 20 additions and 1 deletions
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21
src/uxbox/util/geom/point.cljs
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@ -76,10 +76,19 @@
(Point. (- (:x p) (:x other))
(- (:y p) (:y other)))))
(defn multiply
"Returns the subtraction of the supplied value to both
coordinates of the point as a new point."
[p other]
{:pre [(point? p)]}
(let [other (-point other)]
(Point. (* (:x p) (:x other))
(* (:y p) (:y other)))))
(defn distance
"Calculate the distance between two points."
[p other]
{:pre [(point? p)]}
(let [other (-point other)
dx (- (:x p) (:x other))
dy (- (:y p) (:y other))]
@ -135,3 +144,13 @@
(if (>= x 0)
(if (>= y 0) 1 4)
(if (>= y 0) 2 3)))
(defn transform-point
[pt mx]
(let [other (-point other)]
(Point. (+ (* (:x pt) (:a mx))
(* (:y pt) (:c mx))
(:tx mx))
(+ (* (:x pt) (:b mx))
(* (:y pt) (:d mx))
(:ty mx)))))