Gregg Williams <[email protected]> writes:
> Now I'm working on
> the "Graph Editor" program described at
> http://www.piccolo2d.org/learn/grapheditor.html
> .
>
> In this sample program (which you don't really need to look at) I need
> to subclass a Piccolo2D class to create a class named GraphEditor ,
> but unlike the last time (see "Java interop question: proxy or gen-
> class?" in this group), I can't subclass using proxy because *this*
> subclass, GraphEditor, adds a new method. This means I have to use gen-
> class.
Actually looking at the sample code, GraphEditor doesn't appear to
override any methods of PCanvas, so why does it need to be a subclass at
all? I'd just create a regular instance of PCanvas and work with that
instead:
(defn create-graph-editor [width height]
(let [canvas (doto (PCanvas.)
(.setPreferredSize width height))
node-layer (.getLayer canvas)
edge-layer (PLayer.)
random (Random.)]
(-> canvas (.getRoot) (.addChild edgeLayer))
(-> canvas (.getCamera) (.addLayer 0 edgeLayer))
;;
;; ... and so on. I'd actually probably break the
;; constructor up into multiple functions, it's
;; rather large.
;;
canvas))
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