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(EventDispatchThread.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
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