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:[EMAIL PROTECTED]
Sent: Thursday, March 06, 2008 1:58 PM
To: [email protected]
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:[EMAIL PROTECTED] ▪ ICQ 26955922 ▪ MSN [EMAIL PROTECTED]
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