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Posted to batik-users@xmlgraphics.apache.org by Eric Hamacher <er...@enetrix.com> on 2008/03/06 19:10:10 UTC
dynamic changes to svg not appearing
Hello again:
I am loading an existing SVG file into a Document and adding some nodes
to it.
When I take the resulting Document and transcode it to JPEG or PNG, the
additions (a new <path>) I made do not show up in the image. I printed
the dom to inspect it and my additions were present and formatted
correctly.
//Load dom
String parser = XMLResourceDescriptor.getXMLParserClassName();
SAXSVGDocumentFactory f = new SAXSVGDocumentFactory(parser);
String uri = new File(getServletContext().getRealPath("/") +
"svg\\polarity.svg").toURL().toString();
SVGDocument doc = (SVGDocument) f.createDocument(uri);
. . .
//perform addition of new <path> . . .
. . .
DOMUtil.printDOM(doc); //Print dom to console - everything is
fine
response.setContentType("image/png");
ServletOutputStream out = response.getOutputStream();
PNGTranscoder t = new PNGTranscoder();
t.addTranscodingHint(JPEGTranscoder.KEY_QUALITY, new Float(.8));
t.addTranscodingHint(JPEGTranscoder.KEY_HEIGHT, new
Float(1000));
t.addTranscodingHint(JPEGTranscoder.KEY_WIDTH, new Float(1000));
TranscoderInput input = new TranscoderInput(doc);
TranscoderOutput output = new TranscoderOutput(out);
try {
t.transcode(input, output);
}
catch (TranscoderException e) {
e.printStackTrace();
}
out.flush();
out.close();
The added node prints as:
<path
style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:10px;stro
ke-linecap:butt;strike-linejoin:miter;stroke-opacity:1" d="M -120,-300 C
-200,-300 -200,0 -200,0" id="curveA">
08/03/06 11:54:18 </path>
Other paths have the < and are not affected. Any suggestions?
Regards,
Eric Hamacher
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RE: dynamic changes to svg not appearing
Posted by Eric Hamacher <er...@enetrix.com>.
Here is the entire thing. Thanks:
double actionPositive = new Double(request.getParameter("actpos")).doubleValue() * 100.0;
double actionNegative = new Double(request.getParameter("actneg")).doubleValue() * 100.0;
double reflectionPositive = new Double(request.getParameter("refpos")).doubleValue() * 100.0;
double reflectionNegative = new Double(request.getParameter("refneg")).doubleValue() * 100.0;
String parser = XMLResourceDescriptor.getXMLParserClassName();
SAXSVGDocumentFactory f = new SAXSVGDocumentFactory(parser);
String uri = new File(getServletContext().getRealPath("/") + "svg\\polarity.svg").toURL().toString();
SVGDocument doc = (SVGDocument) f.createDocument(uri);
double a = 200;
double b = 120;
Element svg = doc.getDocumentElement();
//Set the viewBox attribute of svg element
Attr viewBoxAttr = doc.createAttribute("viewBox");
double upperlefty = 0;
double upperleftx = -(a + 100.0);
double lowerrightx = a + 100.0;
double lowerrighty = 0;
if (actionPositive >= reflectionPositive) {
upperlefty = -(actionPositive + 100.0);
}
else {
upperlefty = -(reflectionPositive + 100);
}
if (actionNegative >= reflectionNegative) {
lowerrighty = actionNegative + 100.0;
}
else {
lowerrighty = reflectionNegative + 100.0;
}
viewBoxAttr.setNodeValue(upperleftx + " " + upperlefty + " " + 2*lowerrightx + " " + (-upperlefty + lowerrighty));
svg.setAttributeNode(viewBoxAttr);
//Set the width and height attributes of svg element
Attr widthAttr = doc.createAttribute("width");
Attr heightAttr = doc.createAttribute("height");
widthAttr.setNodeValue("" + (-upperleftx + lowerrightx));
heightAttr.setNodeValue("" + (-upperlefty + lowerrighty));
svg.setAttributeNode(widthAttr);
svg.setAttributeNode(heightAttr);
//Get the g element and add a new <path> for a cubic Bezier
// curve (new <path> will have id,d and style attributes)
NodeList gList = svg.getElementsByTagName("g");
Element g = (Element) gList.item(0);
Element path = doc.createElement("path");
Attr idAttr = doc.createAttribute("id");
idAttr.setNodeValue("curveA");
path.setAttributeNode(idAttr);
Attr dAttr = doc.createAttribute("d");
String ad = "M " + Math.round(-b) + "," + Math.round(-actionPositive) +
" C " + Math.round(-a) + "," + Math.round(-actionPositive) +
" " + Math.round(-a) + "," + (Math.round(actionPositive - actionNegative)/2) +
" " + Math.round(-a) + "," + (Math.round(actionPositive - actionNegative)/2);
dAttr.setNodeValue(ad);
path.setAttributeNode(dAttr);
Attr styleAttr = doc.createAttribute("style");
String style = "fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:10px;" +
"stroke-linecap:butt;strike-linejoin:miter;stroke-opacity:1";
styleAttr.setNodeValue(style);
path.setAttributeNode(styleAttr);
g.appendChild(path);
DOMUtil.printDOM(doc); //prints dom to console - no effect if //withheld
response.setContentType("image/png");
ServletOutputStream out = response.getOutputStream();
//JPEGTranscoder t = new JPEGTranscoder();
PNGTranscoder t = new PNGTranscoder();
t.addTranscodingHint(JPEGTranscoder.KEY_QUALITY, new Float(.8));
t.addTranscodingHint(JPEGTranscoder.KEY_HEIGHT, new Float(1000));
t.addTranscodingHint(JPEGTranscoder.KEY_WIDTH, new Float(1000));
TranscoderInput input = new TranscoderInput(doc);
TranscoderOutput output = new TranscoderOutput(out);
try {
t.transcode(input, output);
}
catch (TranscoderException e) {
e.printStackTrace();
}
out.flush();
out.close();
this yields:
<path style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:10px;stroke-linecap:butt;strike-linejoin:miter;stroke-opacity:1" d="M -120,-300 C -200,-300 -200,0 -200,0" id="curveA">
which is within <g> which is within <svg>
-----Original Message-----
From: Cameron McCormack [mailto:cam@mcc.id.au]
Sent: Thursday, March 06, 2008 1:58 PM
To: batik-users@xmlgraphics.apache.org
Subject: Re: dynamic changes to svg not appearing
Hi Eric.
Eric Hamacher:
> I am loading an existing SVG file into a Document and adding some nodes
> to it.
>
> When I take the resulting Document and transcode it to JPEG or PNG, the
> additions (a new <path>) I made do not show up in the image. I printed
> the dom to inspect it and my additions were present and formatted
> correctly.
…
> //perform addition of new <path> . . .
I think you’ll have to show us this part of your code to see if there’s
any problem with it. The rest of the code looks OK.
--
Cameron McCormack, http://mcc.id.au/
xmpp:heycam@jabber.org ▪ ICQ 26955922 ▪ MSN cam@mcc.id.au
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RE: dynamic changes to svg not appearing
Posted by Eric Hamacher <er...@enetrix.com>.
Hello all:
I finally got my curves to draw on the screen. The trick was to use namespace-aware methods some of the time. I had to mix and match. So I was very fortunate to strike the correct formula. Among the methods used:
doc.createElementNS
doc.createAttribute
doc.createAttributeNS
path.setAttributeNodeNS
Well, once again I thank all of your input. I’d be dead in the water without this mailing list!
Thanks,
Eric
________________________________
From: Abraham Rodriguez Mota [mailto:abraham.rdgz@gmail.com]
Sent: Friday, March 07, 2008 4:41 AM
To: batik-users@xmlgraphics.apache.org
Subject: Re: dynamic changes to svg not appearing
By the way, I am sorry if I miss lead you in my last email
addAttributesNS<-- doesn't exist on the specification. A real example should be:
anyElement.setAttributeNS(null,"color","red");
All the best
Abraham
On Fri, Mar 7, 2008 at 2:18 AM, G. Wade Johnson <gw...@anomaly.org> wrote:
On Thu, 6 Mar 2008 21:05:27 +0000
"Abraham Rodriguez Mota" <ab...@gmail.com> wrote:
> Hi Eric,
>
> I think the problem is that you are not using the name space aware
> methods of batik.
>
> anyElement.addAttributesNS(svgNS,"color","red");
Although we do need to use the namespace-aware methods, most SVG
attributes are in the null namespace.
anyElement.addAttributesNS(null,"color","red");
> However, If you want a simple but raw solution, and if you don't have
> problems saving and loading files, you can try just to save the file
> after changes and reload it from the file system . Batik will read
> it properly, I guess.
>
> All the best
> Abraham.
>
>
>
> On Thu, Mar 6, 2008 at 7:57 PM, Cameron McCormack <ca...@mcc.id.au>
> wrote:
>
> > Hi Eric.
> >
> > Eric Hamacher:
> > > I am loading an existing SVG file into a Document and adding some
> > > nodes to it.
> > >
> > > When I take the resulting Document and transcode it to JPEG or
> > > PNG, the additions (a new <path>) I made do not show up in the
> > > image. I printed the dom to inspect it and my additions were
> > > present and formatted correctly.
> > …
> > > //perform addition of new <path> . . .
> >
> > I think you'll have to show us this part of your code to see if
> > there's any problem with it. The rest of the code looks OK.
> >
> > --
> > Cameron McCormack, http://mcc.id.au/
> > xmpp:heycam@jabber.org ▪ ICQ 26955922 ▪ MSN cam@mcc.id.au
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail:
> > batik-users-unsubscribe@xmlgraphics.apache.org For additional
> > commands, e-mail: batik-users-help@xmlgraphics.apache.org
> >
> >
--
"Half of being clever is making certain you are not being stupid."
-- "Owlflight", Mercedes Lackey
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Re: dynamic changes to svg not appearing
Posted by Abraham Rodriguez Mota <ab...@gmail.com>.
By the way, I am sorry if I miss lead you in my last email
addAttributesNS<-- doesn't exist on the specification. A real example should
be:
anyElement.setAttributeNS(null,"color","red");
All the best
Abraham
On Fri, Mar 7, 2008 at 2:18 AM, G. Wade Johnson <gw...@anomaly.org> wrote:
> On Thu, 6 Mar 2008 21:05:27 +0000
> "Abraham Rodriguez Mota" <ab...@gmail.com> wrote:
>
> > Hi Eric,
> >
> > I think the problem is that you are not using the name space aware
> > methods of batik.
> >
> > anyElement.addAttributesNS(svgNS,"color","red");
>
> Although we do need to use the namespace-aware methods, most SVG
> attributes are in the null namespace.
>
> anyElement.addAttributesNS(null,"color","red");
>
>
> > However, If you want a simple but raw solution, and if you don't have
> > problems saving and loading files, you can try just to save the file
> > after changes and reload it from the file system . Batik will read
> > it properly, I guess.
> >
> > All the best
> > Abraham.
> >
> >
> >
> > On Thu, Mar 6, 2008 at 7:57 PM, Cameron McCormack <ca...@mcc.id.au>
> > wrote:
> >
> > > Hi Eric.
> > >
> > > Eric Hamacher:
> > > > I am loading an existing SVG file into a Document and adding some
> > > > nodes to it.
> > > >
> > > > When I take the resulting Document and transcode it to JPEG or
> > > > PNG, the additions (a new <path>) I made do not show up in the
> > > > image. I printed the dom to inspect it and my additions were
> > > > present and formatted correctly.
> > > …
> > > > //perform addition of new <path> . . .
> > >
> > > I think you'll have to show us this part of your code to see if
> > > there's any problem with it. The rest of the code looks OK.
> > >
> > > --
> > > Cameron McCormack, http://mcc.id.au/
> > > xmpp:heycam@jabber.org ▪ ICQ 26955922 ▪ MSN cam@mcc.id.au
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail:
> > > batik-users-unsubscribe@xmlgraphics.apache.org For additional
> > > commands, e-mail: batik-users-help@xmlgraphics.apache.org
> > >
> > >
>
>
> --
> "Half of being clever is making certain you are not being stupid."
> -- "Owlflight", Mercedes Lackey
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
> For additional commands, e-mail: batik-users-help@xmlgraphics.apache.org
>
>
Re: dynamic changes to svg not appearing
Posted by "G. Wade Johnson" <gw...@anomaly.org>.
On Thu, 6 Mar 2008 21:05:27 +0000
"Abraham Rodriguez Mota" <ab...@gmail.com> wrote:
> Hi Eric,
>
> I think the problem is that you are not using the name space aware
> methods of batik.
>
> anyElement.addAttributesNS(svgNS,"color","red");
Although we do need to use the namespace-aware methods, most SVG
attributes are in the null namespace.
anyElement.addAttributesNS(null,"color","red");
> However, If you want a simple but raw solution, and if you don't have
> problems saving and loading files, you can try just to save the file
> after changes and reload it from the file system . Batik will read
> it properly, I guess.
>
> All the best
> Abraham.
>
>
>
> On Thu, Mar 6, 2008 at 7:57 PM, Cameron McCormack <ca...@mcc.id.au>
> wrote:
>
> > Hi Eric.
> >
> > Eric Hamacher:
> > > I am loading an existing SVG file into a Document and adding some
> > > nodes to it.
> > >
> > > When I take the resulting Document and transcode it to JPEG or
> > > PNG, the additions (a new <path>) I made do not show up in the
> > > image. I printed the dom to inspect it and my additions were
> > > present and formatted correctly.
> > …
> > > //perform addition of new <path> . . .
> >
> > I think you'll have to show us this part of your code to see if
> > there's any problem with it. The rest of the code looks OK.
> >
> > --
> > Cameron McCormack, http://mcc.id.au/
> > xmpp:heycam@jabber.org ▪ ICQ 26955922 ▪ MSN cam@mcc.id.au
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail:
> > batik-users-unsubscribe@xmlgraphics.apache.org For additional
> > commands, e-mail: batik-users-help@xmlgraphics.apache.org
> >
> >
--
"Half of being clever is making certain you are not being stupid."
-- "Owlflight", Mercedes Lackey
---------------------------------------------------------------------
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Re: dynamic changes to svg not appearing
Posted by Abraham Rodriguez Mota <ab...@gmail.com>.
Hi Eric,
I think the problem is that you are not using the name space aware methods
of batik.
anyElement.addAttributesNS(svgNS,"color","red");
However, If you want a simple but raw solution, and if you don't have
problems saving and loading files, you can try just to save the file after
changes and reload it from the file system . Batik will read it properly, I
guess.
All the best
Abraham.
On Thu, Mar 6, 2008 at 7:57 PM, Cameron McCormack <ca...@mcc.id.au> wrote:
> Hi Eric.
>
> Eric Hamacher:
> > I am loading an existing SVG file into a Document and adding some nodes
> > to it.
> >
> > When I take the resulting Document and transcode it to JPEG or PNG, the
> > additions (a new <path>) I made do not show up in the image. I printed
> > the dom to inspect it and my additions were present and formatted
> > correctly.
> …
> > //perform addition of new <path> . . .
>
> I think you'll have to show us this part of your code to see if there's
> any problem with it. The rest of the code looks OK.
>
> --
> Cameron McCormack, http://mcc.id.au/
> xmpp:heycam@jabber.org ▪ ICQ 26955922 ▪ MSN cam@mcc.id.au
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
> For additional commands, e-mail: batik-users-help@xmlgraphics.apache.org
>
>
Re: dynamic changes to svg not appearing
Posted by Cameron McCormack <ca...@mcc.id.au>.
Hi Eric.
Eric Hamacher:
> I am loading an existing SVG file into a Document and adding some nodes
> to it.
>
> When I take the resulting Document and transcode it to JPEG or PNG, the
> additions (a new <path>) I made do not show up in the image. I printed
> the dom to inspect it and my additions were present and formatted
> correctly.
…
> //perform addition of new <path> . . .
I think you’ll have to show us this part of your code to see if there’s
any problem with it. The rest of the code looks OK.
--
Cameron McCormack, http://mcc.id.au/
xmpp:heycam@jabber.org ▪ ICQ 26955922 ▪ MSN cam@mcc.id.au
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