Thanks a lot Vincent. I was reading throught the code but this makes it much clearer, I think I can take it from here :)
Ernie ----- Original Message ----- From: "Vincent Hardy" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, January 06, 2003 3:06 AM Subject: Re: Adding attributes to elements. > Hello Ernie, > > Ernie wrote: > > Ok, I'm not a Swing or SVG Guru, I'm just trying to get some answers to my > > people. I see what SVGGraphics2D is doing and I've read your article on Suns > > site as well as various responses you've made to people. What I'm confused > > about is; > > > > Are you saying I need to modify SVGgraphics2D or do I just manipulte the > > DOM tree after SVGGraphics2D renders the SVG? > > I think you could do what you want by manipulating the DOM tree after > SVGGraphics2D creates the SVG corresponding to the various drawing > methods. Subclassing SVGGraphics2D is also possible. > > > I've gone through the Javadocs > > several times and what you're expecting me to find is not obvious to me, > > there are hundreds of variables which I have no clue as to what they're > > doing. I've also looked at the javadocs for DOMTreeManager and the > > DOMGroupManager and still nothing is popping out at me. I just need a hint > > as to what I need to be looking for and what I'm expected to do with respect > > to the code. Should I be looking for an add_attribute method, should I be > > looking at SVGgraphics2D source code to see how the SVG is being rendered > > I'm completely in the dark at the moment. > > The SVGGraphics2D grows a DOM tree. When you call a method on > SVGGraphics2D, SVGGraphics2D adds to the DOM tree it manages. As far as > I understand, you want to add information to the bits of SVG > corresponding to some specific drawing calls. For example, you'd like to > add an id to the <rect> corresponding to a drawRect call on SVGGraphics2D. > > In order to do that, you need to: > > a. Understand the structure of the DOM that the SVGGraphics2D manipulates. > > b. Understand how to get access to the DOM information manipulated by > the SVGGraphics2D. > > For a., you can have a look at the class documentation for DOMTreeManager: > > /** > * This class is used by the SVGGraphics2D SVG Generator to manage > * addition of new Nodes to the SVG DOM Tree. This class handles > * a set of DOMGroupManager objects that can all append to the > * top level group managed by this class. This allows multiple > * SVGGraphics2D instances, created from the same SVGGraphics2D > * through the various create methods, to append to the same > * SVG document and keep the rendering order correct. > * > * The root node managed by this DOMTreeManager contains two children: > * a top level group node and a top level defs node. The top level > * defs node contains the definition of common SVG entities such as > * the various AlphaComposite rules. Note that other defs can also be > * created under the top level group, for example to represent > * gradient or pattern paints. > * <br> > * [svg] > * | > * +-- [defs] Contain generic definitions > * +-- [g] Top level group > * | > * +-- [defs] Contains definitions specific to rendering > * +-- [g] Group 1 > * +-- ... > * +-- [g] Group n > * > */ > > and DOMGroupManager: > > /** > * This class is used by the Graphics2D SVG Generator to manage > * a group of Nodes that can later be added to the SVG DOM Tree > * managed by the DOMTreeManager. > * > * There are two rules that control how children nodes are > * added to the group managed by this class: > * > * + Children node are added to the group as long as > * there is no more than n graphic context overrides needed to > * describe the children style. A graphic context override > * happens when style attributes need to be added to a child > * node to reflect the state of the graphic context at the > * time the child was added. Note that the opacity is never > * reflected in a group node and therefore, is not accounted > * for in the number of overrides. The number of overrides can > * be configured and defaults to 2. > * + Children nodes are added to the current group as long as > * the associated GraphicContext's transform stack is valid. > * > * When children nodes can no longer be added, the group is considered > * complete and the associated DOMTreeManager is notified of the > * availability of a completed group. Then, a new group is started. > * <br> > * The DOMTreeManager is also notified every thime a new element > * is added to the current group. This is needed to let the > * DOMTreeManager handle group managers that would be used concurrently. > */ > > To see how things work, you can look into SVGGraphics2D.draw(Shape). > > For b., the SwingSVGPrettyPrint class uses some the key methods: > (getRoot(), getTopLevelGroup()) to access the generated DOM structure. > So, to set ids on a <rect> you could, for example: > > SVGGraphics2D g = ...; > > // Get the Top Level Group managed by the DOMTreeManager. > // This also causes g to use a new Top Level Group internally. > Element tlg = g.getTopLevelGroup(); > > // Draw a rect (in a new Top Level Group) > g.drawRect(....); > > // Access the SVG corresponding to the rect and set whatever > // additional information. Here, we add an id. > Element rectGroup = g.getTopLevelGroup(); > rectGroup.setAttributeNS(null, "id", "myRect"); > > // Append rect to original Top Level Group and make that group > // the top level again. > tlg.appendChild(rectGroup); > g.setTopLevelGroup(tlg); > > If you want to avoid setting/resetting the Top you could also subclass > SVGGraphics2D drawing methods (e.g., draw(Shape)) and add your specific > information there (e.g., add some code to tag the content created by > shapeConverter before it is inserted into the domGroupManager. > > Regards, > Vincent. > > > > > Thanks > > Ernie > > ----- Original Message ----- > > From: "Vincent Hardy" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Friday, January 03, 2003 10:57 AM > > Subject: Re: Adding attributes to elements. > > > > > > > >>Hello Ernie, > >> > >>Ernie wrote: > >> > >>>I'm still not following what you are saying. > >>> > >>>You say "look into the code of the classes I was mentioning" > >>> what classes are you mentioning?? > >> > >>In an earlier email, I mentioned the classes to look at: > >> > >> > >>>If you are wondering how to do that for content generated from > >> > > SVGGraphics2D, > > > >> > you'll need to look into the structure of what SVGGraphics2D manages. > >> > This is documented in the DOMTreeManager and the DOMGroupManager > >> > classes. > With that information and your knowledge of what you draw > > > > in an SVGGraphics2D, > > > >>>you can then access the content generated by SVGGraphics2D and add > >> > > attributes to it > > > >>This is the best I can offer today. I understand that you'd like an > >>example but in the meantime, I think you could go a long way with > >>a little homework on the classes I mentioned. > >> > >>Regards, > >>Vincent. > >> > >> > >> > >>>The java docs documentation doesnt tell me anything about adding > >> > > elements. > > > >>>Like a said, an example would go a long way. > >>> > >>>Thanks > >>> > >>>Ernie > >>>----- Original Message ----- > >>>From: "Vincent Hardy" <[EMAIL PROTECTED]> > >>>To: <[EMAIL PROTECTED]> > >>>Sent: Friday, January 03, 2003 10:26 AM > >>>Subject: Re: Adding attributes to elements. > >>> > >>> > >>> > >>> > >>>>Hello Ernie, > >>>> > >>>>Ernest Martinez wrote: > >>>> > >>>> > >>>>>I need to do it for content created from SVGGraphics2D. I dont exactly > >>>>>follow what you mean by "you'll need to look into the structure of what > >>>>>SVGGraphics2D manages" A code snippet would tell a thousand pictures. > >>>> > >>>>What I meant was: look into the code of the classes I was mentioning. > >>>>The documentation in these classes explain the structure of the content > >>>>generated by SVG Graphics 2D. > >>>> > >>>>Vincent. > >>>> > >>>> > >>>> > >>>>>Ernie > >>>>> > >>>>>-----Original Message----- > >>>>>From: Vincent Hardy [mailto:[EMAIL PROTECTED]] > >>>>>Sent: Monday, December 30, 2002 12:22 PM > >>>>>To: [EMAIL PROTECTED] > >>>>>Subject: Re: Adding attributes to elements. > >>>>> > >>>>> > >>>>>Hello Ernie, > >>>>> > >>>>>Ernie wrote: > >>>>> > >>>>> > >>>>> > >>>>>>Hi I'm new to Batik and have a rather simple yet frustrating question. > >>>>>> > >>>>>>I just need to be able to add some other attributes to some SVG > >>>>> > > elements > > > >>>>>>eg I need to add "my_id" to a rect element. I saw a thread which > >>>>>>addressed this exact issue but the only answer was to look at > >>>>>>org.apache.batik.svggen.SwingSVGPrettyPrint. > >>>>>> > >>>>>>This told me absolutely nothing. Can someone be kind enough to show me > >>>>>>an example of how this is accomplished. > >>>>>> > >>>>> > >>>>> > >>>>>Are you asking how to do this for content generated by SVGGraphics2D or > >>>>>for SVG content in general? > >>>>> > >>>>>If you are creating content through the DOM, you would do: > >>>>> > >>>>>Element r = document.createElementNS(svgNS, "rect"); > >>>>>r.setAttribute("id", "my_id"); > >>>>> > >>>>>If you are wondering how to do that for content generated from > >>>>>SVGGraphics2D, you'll need t. This is documented in the DOMTreeManager > >>>> > >>>and > >>> > >>> > >>>>>the > >>>>>DOMGroupManager classes. With that information and your knowledge of > >>>>>what you draw in an SVGGraphics2D, you can then access the content > >>>>>generated by SVGGraphics2D and add attributes to it... > >>>>> > >>>>>If that is not answering your question, thanks for giving more details > >>>>>on what you want to accomplish. > >>>>> > >>>>>Vincent. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
