/*****************************************************************************
* Copyright (C) The Apache Software Foundation. All rights reserved. *
* ------------------------------------------------------------------------- *
* This software is published under the terms of the Apache Software License *
* version 1.1, a copy of which has been included with this distribution in *
* the LICENSE file. *
*****************************************************************************/
package org.apache.batik.bridge;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.util.Map;
import org.apache.batik.ext.awt.image.PadMode;
import org.apache.batik.ext.awt.image.renderable.AffineRable8Bit;
import org.apache.batik.ext.awt.image.renderable.Filter;
import org.apache.batik.ext.awt.image.renderable.PadRable;
import org.apache.batik.ext.awt.image.renderable.PadRable8Bit;
import org.apache.batik.gvt.GraphicsNode;
import org.w3c.dom.Element;
/**
* Bridge class for the <feOffset> element.
*
* @author <a href="mailto:tkormann@apache.org">Thierry Kormann</a>
* @version $Id: SVGFeOffsetElementBridge.java,v 1.13 2003/04/11 13:54:48 vhardy Exp $
*/
public class SVGFeOffsetElementBridge
extends AbstractSVGFilterPrimitiveElementBridge {
/**
* Constructs a new bridge for the <feOffset> element.
*/
public SVGFeOffsetElementBridge() {}
/**
* Returns 'feOffset'.
*/
public String getLocalName() {
return SVG_FE_OFFSET_TAG;
}
/**
* Creates a <tt>Filter</tt> primitive according to the specified
* parameters.
*
* @param ctx the bridge context to use
* @param filterElement the element that defines a filter
* @param filteredElement the element that references the filter
* @param filteredNode the graphics node to filter
*
* @param inputFilter the <tt>Filter</tt> that represents the current
* filter input if the filter chain.
* @param filterRegion the filter area defined for the filter chain
* the new node will be part of.
* @param filterMap a map where the mediator can map a name to the
* <tt>Filter</tt> it creates. Other <tt>FilterBridge</tt>s
* can then access a filter node from the filterMap if they
* know its name.
*/
public Filter createFilter(BridgeContext ctx,
Element filterElement,
Element filteredElement,
GraphicsNode filteredNode,
Filter inputFilter,
Rectangle2D filterRegion,
Map filterMap) {
// 'in' attribute
Filter in = getIn(filterElement,
filteredElement,
filteredNode,
inputFilter,
filterMap,
ctx);
if (in == null) {
return null; // disable the filter
}
// Default region is the size of in (if in is SourceGraphic or
// SourceAlpha it will already include a pad/crop to the
// proper filter region size).
Rectangle2D defaultRegion = in.getBounds2D();
Rectangle2D primitiveRegion
= SVGUtilities.convertFilterPrimitiveRegion(filterElement,
filteredElement,
filteredNode,
defaultRegion,
filterRegion,
ctx);
float dx = convertNumber(filterElement, SVG_DX_ATTRIBUTE, 0);
float dy = convertNumber(filterElement, SVG_DY_ATTRIBUTE, 0);
AffineTransform at = AffineTransform.getTranslateInstance(dx, dy);
// feOffset is a point operation. Therefore, to take the
// filter primitive region into account, only a pad operation
// on the input is required.
PadRable pad = new PadRable8Bit(in, primitiveRegion, PadMode.ZERO_PAD);
Filter filter = new AffineRable8Bit(pad, at);
filter = new PadRable8Bit(filter, primitiveRegion, PadMode.ZERO_PAD);
// handle the 'color-interpolation-filters' property
handleColorInterpolationFilters(filter, filterElement);
// update the filter Map
updateFilterMap(filterElement, filter, filterMap);
return filter;
}
}