SVG Generator - How to get the stream directly (w/out going

A discussion forum for JFreeChart (a 2D chart library for the Java platform).
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Tom Mazzotta

SVG Generator - How to get the stream directly (w/out going

Post by Tom Mazzotta » Thu Jan 30, 2003 1:54 am

I'm using the example outlined in the documentation on how to convert a JFreeChart into an SVG file. This is all working fine (excellent documentation!).

What I'd like to do is a slight variation on this... Instead of writing the SVG stream to a file, I'd like to simply return it as a a Java String (to be used directly). This string will then be added to a bigger XML document /etc. I know I can have the stream written to a file and then read this file back in, but I'd like to avoid this if possible..


//This works, but it writes the stream to a file
boolean useCSS = true; //we want to use CSS style attribute
Writer out = new OutputStreamWriter(new FileOutputStream(new File("NewFile.svg")),"UTF-8");
svgGenerator.stream(out,useCSS);


//This doesn't work right - all the text that is found in "NewFile.svg" is not in s
StringWriter strOut = new StringWriter();
svgGenerator.stream(strOut,useCSS);
String s = strOut.toString(); // this doesn't return all the text in the stream


Net Question: How can I get an SVG text stream from a JFreeChart withOUT going thru a file?

Thanks in advance!
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David Gilbert

Re: SVG Generator - How to get the stream directly (w/out go

Post by David Gilbert » Thu Jan 30, 2003 9:35 pm

At a glance, I would expect that to have worked. If I get a chance I'll try it out, but time is limited at present...

Regards,

Dave Gilbert
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garth braithwaite

Re: SVG Generator - How to get the stream directly (w/out go

Post by garth braithwaite » Fri Jan 31, 2003 7:31 am

Tom, here's the code that works for me:

DOMImplementation domImp = GenericDOMImplementation.getDOMImplementation();
Document document = domImp.createDocument(null, "svg", null);
SVGGraphics2D svgGraphicsEnvironment = new SVGGraphics2D(document);
chart.draw(svgGraphicsEnvironment, new Rectangle2D.Double(0,0,400,300), null);

java.io.ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream( 8192 );
java.io.Writer svgOutput = new java.io.OutputStreamWriter( baos, "UTF-8" );
svgGraphicsEnvironment.stream( svgOutput, true );
String myString = baos.toString();

Hope that helps...
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Tom Mazzotta

Re: SVG Generator - How to get the stream directly (w/out go

Post by Tom Mazzotta » Fri Jan 31, 2003 7:25 pm

Garthe - thanks... I'm still not getting the two to match though...

Below is what I get from doing it the 2 different ways... What I'm seeing is the 2 match up until the part that has 'id="genericDefs"' ... the direct stream just finishes there.. yet the file has a whole bunch of stuff in it (that actually has the information on how to render the graph - important stuff I presume :).

any thoughts?
----------------------
1. with the direct stream, myString has:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 1.0//EN' 'http://www.w3.org/TR/2001/REC-SVG-20010 ... /svg10.dtd'>
<svg xmlns:xlink="http://www.w3.org/1999/xlink" style="fill-opacity:1; color-interpolation:auto; color-rendering:auto; text-rendering:auto; stroke:black; stroke-linecap:square; stroke-miterlimit:10; stroke-opacity:1; shape-rendering:auto; fill:black; stroke-dasharray:none; font-weight:normal; stroke-width:1; font-family:&apos;Arial&apos;; font-style:normal; stroke-linejoin:miter; font-size:12; image-rendering:auto; stroke-dashoffset:0;" xmlns="http://www.w3.org/2000/svg">
<!--Generated by the Batik Graphics2D SVG Generator--> <defs id="genericDefs" /> <g /> </svg>

2. when I tell to write it directly to an SVG file, I see in the SVG File:
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 1.0//EN' 'http://www.w3.org/TR/2001/REC-SVG-20010 ... /svg10.dtd'>
<svg xmlns:xlink="http://www.w3.org/1999/xlink" style="fill-opacity:1; color-interpolation:auto; color-rendering:auto; text-rendering:auto; stroke:black; stroke-linecap:square; stroke-miterlimit:10; stroke-opacity:1; shape-rendering:auto; fill:black; stroke-dasharray:none; font-weight:normal; stroke-width:1; font-family:&apos;Arial&apos;; font-style:normal; stroke-linejoin:miter; font-size:12; image-rendering:auto; stroke-dashoffset:0;" xmlns="http://www.w3.org/2000/svg">
<!--Generated by the Batik Graphics2D SVG Generator-->
<defs id="genericDefs" />
<g>
<defs id="defs1">
<clipPath clipPathUnits="userSpaceOnUse" id="clipPath1">
<path d="M0 0 L400 0 L400 300 L0 300 L0 0 Z" />
</clipPath>
<clipPath clipPathUnits="userSpaceOnUse" id="clipPath2">
<path d="M-10.4736328125 -263.84375 L389.5263671875 -263.84375 L389.5263671875 36.15625 L-10.4736328125 36.15625 L-10.4736328125 -263.84375 Z" />
</clipPath>
<clipPath clipPathUnits="userSpaceOnUse" id="clipPath3">
<path d="M306.20123291015625 165.2987518310547 L306.20123291015625 565.2987670898438 L6.2012481689453125 565.2987670898438 L6.2012481689453125 165.2987518310547 L306.20123291015625 165.2987518310547 Z" />
</clipPath>
<clipPath clipPathUnits="userSpaceOnUse" id="clipPath4">
<path d="M380.07574462890625 91.42427062988281 L380.07574462890625 491.42425537109375 L80.07572937011719 491.42425537109375 L80.07572937011719 91.42427062988281 L380.07574462890625 91.42427062988281 Z" />
</clipPath>
<clipPath clipPathUnits="userSpaceOnUse" id="clipPath5">
<path d="M453.9501953125 17.5498046875 L453.9501953125 417.5498046875 L153.9501953125 417.5498046875 L153.9501953125 17.5498046875 L453.9501953125 17.5498046875 Z" />
</clipPath>
<clipPath clipPathUnits="userSpaceOnUse" id="clipPath6">
<path d="M512.81494140625 -71.33444213867188 L512.81494140625 328.6655578613281 L212.81491088867188 328.6655578613281 L212.81491088867188 -71.33444213867188 L512.81494140625 -71.33444213867188 Z" />
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<clipPath clipPathUnits="userSpaceOnUse" id="clipPath7">
<path d="M586.6893310546875 -145.20889282226562 L586.6893310546875 254.79110717773438 L286.6893615722656 254.79110717773438 L286.6893615722656 -145.20889282226562 L586.6893310546875 -145.20889282226562 Z" />
</clipPath>
<clipPath clipPathUnits="userSpaceOnUse" id="clipPath8">
<path d="M151.70449829101562 111.51699829101562 L151.70449829101562 511.5169982910156 L-148.29550170898438 511.5169982910156 L-148.29550170898438 111.51699829101562 L151.70449829101562 111.51699829101562 Z" />
</clipPath>
<clipPath clipPathUnits="userSpaceOnUse" id="clipPath9">
<path d="M38.216796875 34.82890701293945 L38.216796875 190.400390625 L390 190.400390625 L390 34.82890701293945 Z" />
</clipPath>
</defs>
<g style="fill:rgb(212,208,200); text-rendering:optimizeLegibility; shape-rendering:geometricPrecision; stroke:rgb(212,208,200);">
<rect x="0" y="0" width="400" style="clip-path:url(#clipPath1); stroke:none;" height="300" />
</g>
<g style="text-rendering:optimizeLegibility; font-size:18; shape-rendering:geometricPrecision; font-weight:bold; font-family:sans-serif;">
<text x="14.37060546875" y="24.888866424560547" style="clip-path:url(#clipPath1); stroke:none;" xml:space="preserve">All Items from Profit and Loss Statement</text>
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Tom Mazzotta

Re: SVG Generator - How to get the stream directly (w/out go

Post by Tom Mazzotta » Wed Feb 05, 2003 12:18 am

We figured out what I was doing wrong....

Here's some info so you don't do the same thing...

When you call the stream method from svgGenerator
(ie. svgGenerator.stream( svgOutput, true )), the 'stream' get's emptied. I guess this makes sense...

So if you need to call svgGenerator.stream again for any reason, you need to refill it first.

- I was defining the chart
- filling the svgGenerator with the JFreeChart object
- emptying the stream to a file
- then trying emptying the stream to a string ... and getting nothing in the svg section.
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