Re: Apache Batik

  I don't.  I like seeing every java class I am directly referring to.
I also import every class I use when I write java...so it matches my
style.

  It's not that include_package doesn't work....It is just that it can
be slow and cannot be used in the top-level of a ruby program.  Aliasing
things like java.lang.String is also not so nice.

-Tom

On Tue, 07 Feb 2006, Yemi D. Bedu defenestrated me:

> Hello,
> Is it best to never use include_package?
> 
> Yemi Bedu
> 
> P&R Fasteners
> 325 Pierce St
> Somerset, NJ 08873
> 732-302-3600
> 
> -----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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-- 
+ http://www.tc.umn.edu/~enebo +---- mailto:enebo@xxxxxxx ----+
| Thomas E Enebo, Protagonist  | "Luck favors the prepared    |
|                              |  mind." -Louis Pasteur       |


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