/**
* Returns the transformation matrix to apply to initalize a viewport or null if the specified
* viewBox disables the rendering of the element.
*
* @param e the element with a viewbox
* @param vb the viewBox definition as float
* @param w the width of the effective viewport
* @param h The height of the effective viewport
*/
public static AffineTransform getPreserveAspectRatioTransform(
Element e, float[] vb, float w, float h) {
String aspectRatio = e.getAttributeNS(null, SVG_PRESERVE_ASPECT_RATIO_ATTRIBUTE);
// 'preserveAspectRatio' attribute
PreserveAspectRatioParser p = new PreserveAspectRatioParser();
ViewHandler ph = new ViewHandler();
p.setPreserveAspectRatioHandler(ph);
try {
p.parse(aspectRatio);
} catch (ParseException ex) {
throw new BridgeException(
e,
ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_PRESERVE_ASPECT_RATIO_ATTRIBUTE, aspectRatio, ex});
}
return getPreserveAspectRatioTransform(vb, ph.align, ph.meet, w, h);
}
/**
* Returns the transformation matrix to apply to initalize a viewport or null if the specified
* viewBox disables the rendering of the element.
*
* @param e the element with a viewbox
* @param viewBox the viewBox definition
* @param w the width of the effective viewport
* @param h The height of the effective viewport
*/
public static AffineTransform getPreserveAspectRatioTransform(
Element e, String viewBox, String aspectRatio, float w, float h) {
// no viewBox specified
if (viewBox.length() == 0) {
return new AffineTransform();
}
float[] vb = parseViewBoxAttribute(e, viewBox);
// 'preserveAspectRatio' attribute
PreserveAspectRatioParser p = new PreserveAspectRatioParser();
ViewHandler ph = new ViewHandler();
p.setPreserveAspectRatioHandler(ph);
try {
p.parse(aspectRatio);
} catch (ParseException ex) {
throw new BridgeException(
e,
ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_PRESERVE_ASPECT_RATIO_ATTRIBUTE, aspectRatio, ex});
}
return getPreserveAspectRatioTransform(vb, ph.align, ph.meet, w, h);
}
/**
* Parses the specified reference (from a URI) and returns the appropriate transform.
*
* @param ref the reference of the URI that may specify additional attribute values such as the
* viewBox, preserveAspectRatio or a transform
* @param e the element interested in its view transform
* @param w the width of the effective viewport
* @param h The height of the effective viewport
* @exception BridgeException if an error occured while computing the preserveAspectRatio
* transform
*/
public static AffineTransform getViewTransform(String ref, Element e, float w, float h) {
// no reference has been specified, no extra viewBox is defined
if (ref == null || ref.length() == 0) {
return getPreserveAspectRatioTransform(e, w, h);
}
ViewHandler vh = new ViewHandler();
FragmentIdentifierParser p = new FragmentIdentifierParser();
p.setFragmentIdentifierHandler(vh);
p.parse(ref);
Element attrDefElement = e; // the element that defines the attributes
if (vh.hasId) {
Document document = e.getOwnerDocument();
attrDefElement = document.getElementById(vh.id);
}
if (attrDefElement == null) {
throw new BridgeException(e, ERR_URI_MALFORMED, new Object[] {ref});
}
// if the referenced element is not a view, the attribute
// values to use are those defined on the enclosed svg element
if (!(attrDefElement.getNamespaceURI().equals(SVG_NAMESPACE_URI)
&& attrDefElement.getLocalName().equals(SVG_VIEW_TAG))) {
attrDefElement = getClosestAncestorSVGElement(e);
}
// 'viewBox'
float[] vb;
if (vh.hasViewBox) {
vb = vh.viewBox;
} else {
String viewBoxStr = attrDefElement.getAttributeNS(null, SVG_VIEW_BOX_ATTRIBUTE);
vb = parseViewBoxAttribute(attrDefElement, viewBoxStr);
}
// 'preserveAspectRatio'
short align;
boolean meet;
if (vh.hasPreserveAspectRatio) {
align = vh.align;
meet = vh.meet;
} else {
String aspectRatio = attrDefElement.getAttributeNS(null, SVG_PRESERVE_ASPECT_RATIO_ATTRIBUTE);
PreserveAspectRatioParser pp = new PreserveAspectRatioParser();
ViewHandler ph = new ViewHandler();
pp.setPreserveAspectRatioHandler(ph);
try {
pp.parse(aspectRatio);
} catch (ParseException ex) {
throw new BridgeException(
attrDefElement,
ERR_ATTRIBUTE_VALUE_MALFORMED,
new Object[] {SVG_PRESERVE_ASPECT_RATIO_ATTRIBUTE, aspectRatio, ex});
}
align = ph.align;
meet = ph.meet;
}
// the additional transform that may appear on the URI
AffineTransform transform = getPreserveAspectRatioTransform(vb, align, meet, w, h);
if (vh.hasTransform) {
transform.concatenate(vh.getAffineTransform());
}
return transform;
}