Thanks for your reply, I had actually missed the existence of the Wiki so
thank you for the pointer. I am using a JSVGCanvas though, which is why I
had also assumed a CSS view would have been initialised.
Currently I do the following (am just playing at the moment!) to create my
rectangle:
DOMImplementation domImpl
=SVGDOMImplementation.getDOMImplementation();
// Create an instance of org.w3c.dom.Document.
String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
SVGDocument doc = (SVGDocument) domImpl.createDocument(svgNS,
"svg", null);
svgCanvas.setSVGDocument(doc); // set the document for the JSVGCanvas
object
// Get the root element (the 'svg' element).
Element svgRoot = doc.getDocumentElement();
// Set the width and height attributes on the root 'svg' element.
svgRoot.setAttributeNS(null, "width", "1000");
svgRoot.setAttributeNS(null, "height", "500");
// Create the rectangle.
Element rectangle = doc.createElementNS(svgNS,
SVGConstants.SVG_RECT_TAG );
rectangle.setAttributeNS(null, "x", "10");
rectangle.setAttributeNS(null, "y", "20");
rectangle.setAttributeNS(null, SVGConstants.SVG_WIDTH_ATTRIBUTE,
"100");
rectangle.setAttributeNS(null, SVGConstants.SVG_HEIGHT_ATTRIBUTE,
"50");
rectangle.setAttributeNS(null, "fill", "red");
svgRoot.appendChild(rectangle);
I then (sometime later) retrieve the color via:
String color = domElement.getAttributeNS(null,
SVGConstants.SVG_FILL_ATTRIBUTE);
which gives me back a string ("#FF0000").
Now I could assume that this would always be the hex representation as I
am building the tree in the first place, but I would rather know how to do
this more cleanly taking into account the four color representations:
// fill="cornflowerblue"
// fill="rgb(100, 149, 237)"
// fill="#6495ED"
// fill="aliceblue"
Any ideas?
Tom
On Mon, 09 Apr 2007 16:52:13 +0100, Bishop, Michael W. CONTR J9C880
<[EMAIL PROTECTED]> wrote:
Are you using a JSVGCanvas? You might want to check the wiki on the
Batik site about booting CSS and DOM. JSVGCanvas does this for you. If
you don't use one, you have to do it manually. Even though you're not
setting CSS values for color, a CSS is "computed" through the magic of
Batik (I'm sure someone can explain this much better) and you need these
pieces loaded to use that functionality:
http://wiki.apache.org/xmlgraphics-batik/BootSvgAndCssDom
Michael Bishop
-----Original Message-----
From: Tom McCallum [mailto:[EMAIL PROTECTED]
Sent: Monday, April 09, 2007 10:12 AM
To: [email protected]
Subject: Another Color Question
From a previous post I found I have a function to get the colour of an
element as follows:
public static Color getColor(Element element, String attribute) {
Color returnColor = null;
final Document document = element.getOwnerDocument();
if ( document != null ) {
//System.out.println("doc.getDocumentElement:
"+document.getDocumentElement().getClass().toString());
final ViewCSS viewCSS = (ViewCSS)
document.getDocumentElement();
if ( viewCSS != null ) {
final CSSStyleDeclaration computedStyle =
viewCSS.getComputedStyle(element, null);
if ( computedStyle != null ) {
System.out.println("CSS Text:
"+computedStyle.getCssText());
final SVGPaint svgPaint =
(SVGPaint)
computedStyle.getPropertyCSSValue(attribute);
if ( svgPaint != null ) {
if (svgPaint.getPaintType() ==
SVGPaint.SVG_PAINTTYPE_RGBCOLOR) {
final RGBColor rgb =
svgPaint.getRGBColor();
final float red =
rgb.getRed().getFloatValue(CSSValue.CSS_PRIMITIVE_VALUE);
final float green =
rgb.getGreen().getFloatValue(CSSValue.CSS_PRIMITIVE_VALUE);
final float blue =
rgb.getBlue().getFloatValue(CSSValue.CSS_PRIMITIVE_VALUE);
returnColor = new Color(red / 255, green /
255, blue / 255);
}
}
}
}
}
return returnColor;
}
I have a simple SVG which creates a coloured rectangle:
<?xml version="1.0" encoding="UTF-8"?><svg
xmlns:xlink="http://www.w3.org/1999/xlink";
xmlns="http://www.w3.org/2000/svg"; contentScriptType="text/ecmascript"
width="1000" zoomAndPan="magnify" contentStyleType="text/css"
height="500"
preserveAspectRatio="xMidYMid meet" version="1.0"><rect fill="#ff0000"
x="100" width="100" y="100" height="50"/></svg>
Unfortunately I cannot get the colour of the rectangle back to a
java.awt.Color object, as I get the following exception:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at
org.apache.batik.css.dom.CSSOMComputedStyle.getCssText(Unknown
Source)
at ataglancedemo.SVGUtils.getColor(SVGUtils.java:56)
at ataglancedemo.GlanceRect.getBackground(GlanceRect.java:93)
at ataglancedemo.MainFrame.test4(MainFrame.java:84)
at ataglancedemo.MainFrame.<init>(MainFrame.java:213)
at ataglancedemo.Main$1.run(Main.java:29)
at
java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThrea
d.java:242)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.
java:163)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at
java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Can anyone tell me how to get the background color in all circumstances,
i.e. when it is just an attribute or if as a CSS?
Many thanks
Tom
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
--
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
