RE: Apache Batik

Hello,
Is it best to never use include_package?

Yemi Bedu

P&R Fasteners
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-----Original Message-----
From: jruby-user-admin@xxxxxxxxxxxxxxxxxxxxx
[mailto:jruby-user-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Thomas E
Enebo
Sent: Tuesday, February 07, 2006 10:32 AM
To: jruby-user@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [Jruby-user] Apache Batik

  Or more specifically (windows/cygwin -- change export to set for CMD):

export
CLASSPATH="c:/opt/batik-1.6/lib/batik-swing.jar;c:/opt/batik-1.6/lib/bat
ik-svggen.jar;c:/opt/batik-1.6/lib/batik-dom.jar;c:/opt/batik-1.6/lib/ba
tik-gui-util.jar;c:/opt/batik-1.6/lib/batik-svg-dom.jar;c:/opt/batik-1.6
/lib/batik-gvt.jar;c:/opt/batik-1.6/lib/batik-ext.jar;c:/opt/batik-1.6/l
ib/batik-awt-util.jar;c:/opt/batik-1.6/lib/batik-util.jar;c:/opt/batik-1
.6/lib/batik-css.jar;c:/opt/batik-1.6/lib/batik-xml.jar;c:/opt/batik-1.6
/lib/batik-bridge.jar;c:/opt/batik-1.6/lib/batik-script.jar;c:/opt/batik
-1.6/lib/batik-parser.jar;c:/opt/postgresql/postgresql-8.1-404.jdbc3.jar
;."

  Assumming batik is install in c:/opt/batik-1.6.

  include_class is faster and more flexible than include_package:
1. include_class can be done in top-level of ruby (rather than only in a
non-toplevel namespace)
2. include_package does a class.for_name everytime ruby encounters an
unknown constant in the namespace it is included in.  This can really
degrade performance.

  I reiterate the tip to use include_class instead of include_package.

-Tom

PS - Here is some icky code I wrote using batik and Java2D.  It is
incomplete
but it shows some Java integration in it:

--dbrenderer.rb--
require 'java'

include_class 'java.awt.BasicStroke'
include_class 'java.awt.Color'
include_class 'java.awt.Font'
include_class 'java.awt.Rectangle'
include_class 'java.awt.font.TextLayout'
include_class 'java.awt.geom.Line2D'
include_class 'java.awt.geom.Point2D'
include_class 'java.awt.geom.RoundRectangle2D'
include_class 'javax.swing.JFrame'
include_class 'org.apache.batik.dom.svg.SVGDOMImplementation'
include_class 'org.apache.batik.svggen.SVGGraphics2D'
include_class 'org.apache.batik.swing.JSVGCanvas'

class TableRenderer
  PADDING = 5

  # returns bounds of item rendered
  def render(m, table, loc)
    bounds = m.render_string(table.name, loc)
    x, y = bounds.x + loc.x - PADDING, bounds.y + loc.y - PADDING
    width = bounds.width + 2 * PADDING
    line_height = bounds.height + 2 * PADDING
    r = m.render_round_rectangle(x, y, width, 2 * line_height + 2 *
PADDING)
    m.render_line(x, y + line_height, x + width, y + line_height)
    r
  end
end

class SchemaRenderer
  PADDING = 50
  def initialize
    @stored_bounds = {}
  end

  def render(m, schema, loc)
    schema.sort.each do |table| 
      b = m.render(table, loc)
      @stored_bounds[table.name] = b

      x, y = loc.x + b.width + PADDING, loc.y
      x, y = 20, loc.y + b.height + PADDING if x > m.width
      loc = Point2D::Double.new(x, y)
    end
    r = get_bounds
    m.width, m.height = r.width, m.height
    r
  end

  def get_bounds
    width, height = 0, 0
    @stored_bounds.values.each do |b|
      width = b.x + b.width if b.x + b.width > width
      height = b.y + b.height if b.y + b.height > height
    end
    Rectangle.new(0, 0, width + PADDING, height + PADDING)
  end
end

class RenderManager
  THIN_STROKE = BasicStroke.new(1, BasicStroke::CAP_ROUND,
                                 BasicStroke::JOIN_ROUND, 0)
  THICK_STROKE = BasicStroke.new(3, BasicStroke::CAP_ROUND,
                                  BasicStroke::JOIN_ROUND, 0)
  FONT = Font.decode("Courier-PLAIN-18")

  attr_reader :g
  attr_accessor :height, :width

  def initialize(frame_width=600, frame_height=600)
    impl = SVGDOMImplementation.getDOMImplementation
    @doc = impl.createDocument SVGDOMImplementation::SVG_NAMESPACE_URI,
"svg", nil
    @width, @height = frame_width, frame_height
    @g = SVGGraphics2D.new @doc
    @g.setPaint(Color.black)
    @renderers = {}
  end

  def set_renderer(type, renderer)
    @renderers[type] = renderer
  end

  def render(renderable, loc = Point2D::Double.new(20, 60))
    renderer = @renderers[renderable.class]
    if renderer.nil?
      puts "Unable to find renderer for renderable" 
      return
    end

    renderer.render(self, renderable, loc)
  end

  def render_round_rectangle(x, y, width, height)
    @g.setStroke(THICK_STROKE)
    r = RoundRectangle2D::Double.new(x, y, width, height, 10, 10)
    @g.draw(r)
    r
  end

  def render_string(string, loc)
    layout = TextLayout.new string, FONT, @g.getFontRenderContext
    layout.draw @g, loc.x, loc.y
    layout.bounds
  end

  def render_line(x1, y1, x2, y2)
    @g.setStroke(THIN_STROKE)
    @g.draw(Line2D::Double.new(x1, y1, x2, y2))
  end

  def finish
    @g.getRoot @doc.getDocumentElement
    canvas = JSVGCanvas.new
    f = JFrame.new
    f.getContentPane.add canvas
    canvas.setSVGDocument @doc
    canvas.setSize(@width, @height)
    f.setDefaultCloseOperation(JFrame::EXIT_ON_CLOSE)
    f.setSize @width, @height
    f.setVisible true
  end
end
--


On Tue, 07 Feb 2006, Charles O Nutter defenestrated me:

> What you probably need to do is actually put the Batik jar files in
> the CLASSPATH variable, as in:
> 
> set CLASSPATH=someJar1.jar;someJar2.jar .... etc
> 
> or on a UNIX environment:
> 
> export CLASSPATH=someJar1.jar:someJar2.jar ... etc
> 
> Pointing the classpath at the base directory containing the .java
> files does not help because the files have not been compiled. The
> compiled files, with a .class extension, are required to execute the
> code. Those files are generally contained in the jar files, and so you
> need to point your CLASSPATH at the jar files directly.
> 
> If you continue to have issues, please let us know. Sending your
> current CLASSPATH might also help. JRuby should be able to load
> classes and packages in your classpath sucessfully; it's just a matter
> of getting the classpath set right.
> 
> - Charlie
> 
> On 2/7/06, Mark Wong-VanHaren <markwvh@xxxxxxxxx> wrote:
> > Hi, folks-
> >
> > I am attempting to use JRuby to control Apache Batik.
> > (The Rasterizer, specifically.)
> >
> > I am utterly Java-ignorant.  The problem I'm encountering
> > may well be very simple, just due to my complete Java ignorance.
> > Maybe someone more clueful can steer me right?
> >
> > The JRE (1.5.0_06) works fine; I can run the Batik-rasterizer JAR
with it.
> > Also, JRuby (0.8.2) works fine; it successfully runs the JRuby
sample scripts.
> > No problems there.
> >
> > What I'm ignorant about is how to do is to make JRuby recognize
> > Java classes/projects which are *not* part of the standard Java
distro.
> >
> > My jruby script:
> > ======
> > require 'java'
> > module Foo
> >   include_package 'org.apache.batik.apps.rasterizer'
> >   converter = Main.new     # Main is a class in Rasterizer
> > end
> > ======
> >
> > Running this (using bin/jruby.rb) produces the following error:
> > =====
> > /home/enebo/release/jruby/src/builtin/javasupport.rb:409:in
> > `const_missing': uninitialized constant Main at Bobo (NameError)
> >        from
/home/enebo/release/jruby/src/builtin/javasupport.rb:409:in
> > `const_missing'
> >        from svg_rasterizer.rb:4
> >        from :0
> > =====
> >
> > I presume that means that JRuby doesn't know where to find
> > "org.apache.batik.apps.rasterizer"?
> >
> > For rasterizer, I have both the JAR file and all the .java files.
> >
> > For the .java files, I set the environment variable CLASSPATH
> > to the dir just above "org", hoping that would help it find it, but
no luck.
> >
> > For the .jar file, I've put it everywhere I could think of: in the
> > present working directory, in /usr/lib, and
I-don't-remember-where-else,
> > with the same results.
> >
> > I would be greatly indebted to anyone who might point me
> > in the right direction.
> >
> > Thanks!
> > -Mark
> >  mark wong-vanharen
> >  markwvh at gmail dot com
> >
> >
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> >
> 
> 
> --
> Charles Oliver Nutter @ headius.blogspot.com
> JRuby Developer @ jruby.sourceforge.net
> Application Architect @ www.ventera.com
> 
> 
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-- 
+ http://www.tc.umn.edu/~enebo +---- mailto:enebo@xxxxxxx ----+
| Thomas E Enebo, Protagonist  | "Luck favors the prepared    |
|                              |  mind." -Louis Pasteur       |


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