How to concatenate static methods from a Java class object?

Question

I'm trying to call the randomVector method from the Vec2D class found here http://toxiclibs.org/docs/core/

Here is my code:

(def particles (new ArrayList))


(defn add-particle []
  (dotimes [i 100]
    (doto particles
      ;(.add (new Vec2D (random (width)) (random (height))))
      (.add (Vec2D/randomVector))))

So far so good but I need to call other methods like scale and add from the same class, I have not idea how to do that in Clojure

Here is how I do it in Java:

Vec2D position = Vec2D.randomVector().scale( 60 ).add( canvasCenter );

Any help will be much appreciated

possible duplicate of How can I call a java static method in clojure? — Jon Skeet
– Jon Skeet, Commented Mar 13, 2013 at 16:05
Regarding your edit about chaining methods: use .. or -> with .. This is a duplicate question: stackoverflow.com/questions/8821751/… — A. Webb
– A. Webb, Commented Mar 13, 2013 at 16:39

Abimaran Kugathasan · Accepted Answer · 2013-03-13 16:45:30Z

2

Try the following code, java static methods should be called like (ClassName/methodName arguments)

(defn add-particle []
  (dotimes [i 100]
    (doto particles
      (.add (Vec2D/randomVector)))))

For your second question, any way you need to define canvasCenter some where.

(defn add-particle []
      (dotimes [i 100]
        (doto particles
          (.add (.scale (Vec2D/randomVector) (float 60)) canvasCenter)))

edited Mar 13, 2013 at 16:45

answered Mar 13, 2013 at 16:20

Abimaran Kugathasan

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8 Comments

Ricardo Sanchez Over a year ago

Oh thanks Kugathasan I found the answer on the other post someone point me as duplicate, but I edited the question wonder if you can help me

Abimaran Kugathasan Over a year ago

@RicardoSancher: Can you please check the answer now?

Ricardo Sanchez Over a year ago

Not yet as I'm getting the following error "No matching method found: scale for class toxi.geom.Vec2D" ;)

Abimaran Kugathasan Over a year ago

@RicardoSanchez, just check, scale method accept float value.

Ankur Over a year ago

@RicardoSanchez: use (float 60.0)

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