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From: "Lukasz Matuszczak" <l.matuszczak@atrem.pl>
To: "Batik Users" <batik-users@xml.apache.org>
Subject: Mix SVG with Swing - Swing GraphicsNode?
Date: Thu, 13 Jan 2005 16:18:56 +0100
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I'm using the batik toolkit to create dynamic and interactive diagrams in my 
Swing application. The diagrams should mix typical SVG content with swing 
components, like a JButton, ChartPanel (from JFreeChart project). I assume 
that my diagram consists of a SVG background (presented by JSVGCanvas or 
potentially one of its superclasses) and components, which locations and 
sizes are specified relative to coordinate system of the background. By the 
way, due to performance reasons, some of my components are simply 
transparent JSVGCanvases. For example when I want to change quickly some 
small part of my SVG document (for example to rotate fast a small arrow 
symbol in a big complicated document), using single JSVGCanvas turned out to 
be totally ineffective. Instead I'm cutting out DOM  fragment and creating 
separate SVG document out of it. It is a little tricky solution because i 
have to set <svg> tag viewbox attribute properly for the additional SVG 
Document, when i want my JSVGCanvas component to have a different location 
and size than my background JSVGCanvas.

I have already created my own tags such as  <oc:component id="btn1" 
type="JButton" x="100" y="170" width="200" height="20"><oc:param 
name="caption" value="My Button"></oc:component>

I can see different approaches to implement SVG and Swing mix.

1. Using JLayeredPane with custom layout manager. It is my current approach, 
with which i'm not satisfied. In layout container we can set components' 
bounds in layoutContainer method, based on viewboxtransform of background 
canvas. The layered pane revalidate method is called in 
gvtRenderingCompleted or updateCompleted when the viewbox transform has 
changed. Off course it's a simplification, because components' bounds should 
be calculated according to their parent tags coordinate system.
The shortcoming of this solution is that we can't put JLayeredPane in 
JSVGScrollPane, so we have to implement all zoom and scrolling stuff on our 
own.
2. Using JSVGCanvas as container (add method) - it is similar to first 
solution, but it's potentially easier to use JSVGScrollPane.
3. Using batik extension mechanism. It would be the best solution because 
all positioning, zooming, scrolling, painting, printing and so on, would be 
supported directly by batik. Also i could partially cover swing components 
by SVG shapes.
Thierry Kormann in 
http://koala.ilog.fr/batik/mlists/batik-users/archives/msg01001.html 
suggests that it is possible, but i got stuck in event dispatching and 
repainting.
I have made bridges and dom extensions and MyComponentNode extending 
AbstractGraphicsNode.
For example i call JButton's paint from MyComponentNode's primitivePaint(..) 
method to paint button at specific place:

public void primitivePaint(Graphics2D g2d) {
  ...
  Graphics gForComponent = g2d.create();
  gForComponent.translate(button.getX(), button.getY());
  button.paint(gForComponent);
  ...
}

At MyComponentNodeBridge' createGraphicsNode method I register listener on 
graphics nodes mouse events. The code is:

  UserAgent ua = ctx.getUserAgent();
  if (ua != null) {
  EventDispatcher dispatcher = ua.getEventDispatcher();
  if (dispatcher != null) {
    dispatcher.addGraphicsNodeMouseListener(node.getMouseListener());
  }

I wanted to implement all methods of my mouseListener similar to:
button.dispatchEvent(new MouseEvent(button,
  evt.getID(),
  evt.getWhen(),
  evt.getModifiers(),
  x,
  y,
  evt.getClickCount(),
  false));

Well, it nearly works but the problem is that the JButton doesn't belong to 
Swing hierarchy so it won't repaint itself (for example to show that it's 
pressed down).

Has anyone succeeded in making graphics node in GVT Tree based on Swing 
Component, making it interactive when showed in JSVGCanvas?

I would also be grateful for any thoughts about advantages and disadvantages 
of above approaches (espacially in the context of memory and processor 
usage).

Thanks in advance.
Lukasz Matuszczak 


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