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Re: Looking for a simple

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  To: comp.lang.java.gui
Simo Melenius <simo.melenius@gmail.com> writes:
>What I seem to need most often is a simple API/library to open
>a window and draw some graphics to its bitmap. Aside from AWT
>and Java2D, are there any de facto libraries that Java
>programmers frequently use for such purpose?

  Because of the structure of Java, one would need a framework
  (not a library) for this. (You call a library, while a
  framework calls you.)

  The framework would open a window and pass the graphics
  context to your +hook method2 (aka call-back).

  An example of such a framework are web browsers, which
  execute Java applets. Your applet is called from the browser
  and is given a graphic context, so that you can start
  painting immediately, IIRC.

  Most Java-programmers do not use such a framework, because
  opening a window so that one can draw on it only takes a few
  lines of code. But you need to /know/ how to do it. You might
  start here:

http://java.sun.com/docs/books/tutorial/uiswing/painting/

  Also have a look at the example code for drawing and
  animation that comes with Java: +Java\jdk...\demo\jfc\Java2D2
  (source code included).

  There also are additional libraries for graphics:

http://schmidt.devlib.org/jiu/links.html

>I would hope to find something that is less complex and object
>oriented than AWT and more imperative, thus making it suitable for
>being run directly from Clojure REPL (where I would basically have one
>function which opens the window, loops reading events, doing
>something, and rendering, and then closes down everything upon
>exiting).

  Clojure wants to be +functional2 - not +procedural2.

  And +functional2 is close to +object oriented2, because
  in both cases you pass in call-backs (= first class functions
  or +blocks2).

  procedural (C) pseudocode:

if( canvas = opencanvas( 640, 480 ))
{ drawto( canvas );
  close( canvas ); }

  object-oriented (Smalltalk) pseudocode:

withcanvas( 640, 480,[ canvas: drawto( canvas )])

  Common-Lisp-like pseudocode:

( with-open-canvas 640 480
  ( lambda canvas ( drawto canvas )))

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Re: Looking for a simple "ram" <ram@THRWHITE.remove-dii-this> - 2011-04-27 15:50 +0000

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