http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id: SVGElement.java 1664570 2015-03-06 09:41:07Z lbernardo $ */

package org.apache.fop.fo.extensions.svg;

// FOP
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.net.URI;

import org.w3c.dom.Element;

import org.apache.batik.anim.dom.SVGDOMImplementation;
import org.apache.batik.anim.dom.SVGOMDocument;
import org.apache.batik.anim.dom.SVGOMElement;
import org.apache.batik.bridge.UnitProcessor;
import org.apache.batik.dom.svg.SVGContext;
import org.apache.batik.dom.util.XMLSupport;
import org.apache.batik.util.SVGConstants;

import org.apache.fop.fo.FONode;
import org.apache.fop.util.ContentHandlerFactory;


Class representing the SVG root element
for constructing an SVG document.

/**
 * Class representing the SVG root element
 * for constructing an SVG document.
 */
public class SVGElement extends SVGObj {

    
Constructs an SVG object

Params:
  • parent – the parent formatting object
/**
     * Constructs an SVG object
     *
     * @param parent the parent formatting object
     */
    public SVGElement(FONode parent) {
        super(parent);
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    public ContentHandlerFactory getContentHandlerFactory() {
        return new SVGDOMContentHandlerFactory();
    }

    
Get the dimensions of this XML document.

Params:
  • view – the viewport dimensions
Returns:the dimensions of this SVG document
/**
     * Get the dimensions of this XML document.
     * @param view the viewport dimensions
     * @return the dimensions of this SVG document
     */
    public Point2D getDimension(final Point2D view) {

        // TODO change so doesn't hold onto fo, area tree
        Element svgRoot = element;
        /* create an SVG area */
        /* if width and height are zero, get the bounds of the content. */

        try {
            URI baseUri = getUserAgent().getResourceResolver().getBaseURI();
            if (baseUri != null) {
                SVGOMDocument svgdoc = (SVGOMDocument)doc;
                svgdoc.setURLObject(baseUri.toURL());
                //The following line should not be called to leave FOP compatible to Batik 1.6.
                //svgdoc.setDocumentURI(baseURL.toString());
            }
        } catch (Exception e) {
            log.error("Could not set base URL for svg", e);
        }

        final float ptmm = getUserAgent().getSourcePixelUnitToMillimeter();
        // temporary svg context
        SVGContext dc = new SVGContext() {
            public float getPixelToMM() {
                return ptmm;
            }
            public float getPixelUnitToMillimeter() {
                return ptmm;
            }

            public Rectangle2D getBBox() {
                return new Rectangle2D.Double(0, 0, view.getX(), view.getY());
            }

            
Returns the transform from the global transform space to pixels.

/**
             * Returns the transform from the global transform space to pixels.
             */
            public AffineTransform getScreenTransform() {
                throw new UnsupportedOperationException("NYI");
            }

            
Sets the transform to be used from the global transform space
to pixels.

/**
             * Sets the transform to be used from the global transform space
             * to pixels.
             */
            public void setScreenTransform(AffineTransform at) {
                throw new UnsupportedOperationException("NYI");
            }

            public AffineTransform getCTM() {
                return new AffineTransform();
            }

            public AffineTransform getGlobalTransform() {
                return new AffineTransform();
            }

            public float getViewportWidth() {
                return (float)view.getX();
            }

            public float getViewportHeight() {
                return (float)view.getY();
            }

            public float getFontSize() {
                return 12;
            }
        };
        SVGOMElement e = (SVGOMElement)svgRoot;
        e.setSVGContext(dc);

        //if (!e.hasAttributeNS(XMLSupport.XMLNS_NAMESPACE_URI, "xmlns")) {
            e.setAttributeNS(XMLSupport.XMLNS_NAMESPACE_URI, "xmlns",
                                SVGDOMImplementation.SVG_NAMESPACE_URI);
        //}
        int fontSize = 12;
        Point2D p2d = getSize(fontSize, svgRoot, getUserAgent().getSourcePixelUnitToMillimeter());
        e.setSVGContext(null);

        double pixelToPoint = 72d / getUserAgent().getSourceResolution();
        return new Point2D.Double(p2d.getX() * pixelToPoint, p2d.getY() * pixelToPoint);
    }

    
Get the size of the SVG root element.

Params:
  • size – the font size
  • svgRoot – the svg root element
  • ptmm – the pixel to millimeter conversion factor
Returns:the size of the SVG document
/**
     * Get the size of the SVG root element.
     * @param size the font size
     * @param svgRoot the svg root element
     * @param ptmm the pixel to millimeter conversion factor
     * @return the size of the SVG document
     */
    public static Point2D getSize(int size, Element svgRoot, float ptmm) {
        String str;
        UnitProcessor.Context ctx;
        ctx = new PDFUnitContext(size, svgRoot, ptmm);
        str = svgRoot.getAttributeNS(null, SVGConstants.SVG_WIDTH_ATTRIBUTE);
        if (str.length() == 0) {
            str = "100%";
        }
        float width = UnitProcessor.svgHorizontalLengthToUserSpace(
            str, SVGConstants.SVG_WIDTH_ATTRIBUTE, ctx);

        str = svgRoot.getAttributeNS(null, SVGConstants.SVG_HEIGHT_ATTRIBUTE);
        if (str.length() == 0) {
            str = "100%";
        }
        float height = UnitProcessor.svgVerticalLengthToUserSpace(
            str, SVGConstants.SVG_HEIGHT_ATTRIBUTE, ctx);
        return new Point2D.Float(width, height);
    }

    
This class is the default context for a particular
element. Information not available on the element are obtained from
the bridge context (such as the viewport or the pixel to
millimeter factor.

/**
     * This class is the default context for a particular
     * element. Information not available on the element are obtained from
     * the bridge context (such as the viewport or the pixel to
     * millimeter factor.
     */
    public static class PDFUnitContext implements UnitProcessor.Context {

        
The element. 
/** The element. */
        private Element e;
        private int fontSize;
        private float pixeltoMM;

        
Create a PDF unit context.

Params:
  • size – the font size.
  • e – the svg element
  • ptmm – the pixel to millimeter factor
/**
         * Create a PDF unit context.
         * @param size the font size.
         * @param e the svg element
         * @param ptmm the pixel to millimeter factor
         */
        public PDFUnitContext(int size, Element e, float ptmm) {
            this.e = e;
            this.fontSize = size;
            this.pixeltoMM = ptmm;
        }

        
Returns the element.

Returns:the element
/**
         * Returns the element.
         * @return the element
         */
        public Element getElement() {
            return e;
        }

        
Returns the context of the parent element of this context.
Since this is always for the root SVG element there never
should be one...

Returns:null
/**
         * Returns the context of the parent element of this context.
         * Since this is always for the root SVG element there never
         * should be one...
         * @return null
         */
        public UnitProcessor.Context getParentElementContext() {
            return null;
        }

        
Returns the pixel to mm factor. (this is deprecated)

Returns:the pixel to millimeter factor
/**
         * Returns the pixel to mm factor. (this is deprecated)
         * @return the pixel to millimeter factor
         */
        public float getPixelToMM() {
            return pixeltoMM;
        }

        
Returns the pixel to mm factor.

Returns:the pixel to millimeter factor
/**
         * Returns the pixel to mm factor.
         * @return the pixel to millimeter factor
         */
        public float getPixelUnitToMillimeter() {
            return pixeltoMM;
        }

        
Returns the font-size value.

Returns:the default font size
/**
         * Returns the font-size value.
         * @return the default font size
         */
        public float getFontSize() {
            return fontSize;
        }

        
Returns the x-height value.

Returns:the x-height value
/**
         * Returns the x-height value.
         * @return the x-height value
         */
        public float getXHeight() {
            return 0.5f;
        }

        
Returns the viewport width used to compute units.

Returns:the default viewport width of 100
/**
         * Returns the viewport width used to compute units.
         * @return the default viewport width of 100
         */
        public float getViewportWidth() {
            return 100;
        }

        
Returns the viewport height used to compute units.

Returns:the default viewport height of 100
/**
         * Returns the viewport height used to compute units.
         * @return the default viewport height of 100
         */
        public float getViewportHeight() {
            return 100;
        }
    }

}