SVGImageGenerator.java example

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/*******************************************************************************
 * Copyright 2010 Simon Mieth
 * 
 * Licensed 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.
 ******************************************************************************/

package org.kabeja.svg.generators;

import java.util.Map;

import org.kabeja.common.DraftEntity;
import org.kabeja.entities.Image;
import org.kabeja.math.Point3D;
import org.kabeja.math.TransformContext;
import org.kabeja.objects.ImageDefObject;
import org.kabeja.svg.SVGConstants;
import org.kabeja.svg.SVGUtils;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;


public class SVGImageGenerator extends AbstractSVGSAXGenerator {
    public void toSAX(ContentHandler handler, Map svgContext, DraftEntity entity,
        TransformContext transformContext) throws SAXException {
        Image image = (Image) entity;

        // get the image path from the referenced IMAGEDEF object
        ImageDefObject imageDef = (ImageDefObject) image.getDocument()
                                                              .getObjectByID(image.getImageDefObjectID());

        if (imageDef != null) {
            // TODO add clipping here with clipPath
            AttributesImpl attr = new AttributesImpl();
            super.setCommonAttributes(attr, svgContext, image);

            Point3D insertPoint = image.getInsertPoint();

            double imageSizeAlongU = image.getImageSizeAlongU();
            double imageSizeAlongV = image.getImageSizeAlongV();

            SVGUtils.addAttribute(attr, "x",
                SVGUtils.formatNumberAttribute(insertPoint.getX()));
            SVGUtils.addAttribute(attr, "y",
                SVGUtils.formatNumberAttribute(insertPoint.getY()));
            SVGUtils.addAttribute(attr, SVGConstants.SVG_ATTRIBUTE_WIDTH,
                SVGUtils.formatNumberAttribute(+imageSizeAlongU));
            SVGUtils.addAttribute(attr, SVGConstants.SVG_ATTRIBUTE_HEIGHT,
                SVGUtils.formatNumberAttribute(+imageSizeAlongV));

            // convert the file to uri
            attr.addAttribute(SVGConstants.XMLNS_NAMESPACE, "xlink",
                "xmlns:xlink", "CDATA", SVGConstants.XLINK_NAMESPACE);
            attr.addAttribute(SVGConstants.XLINK_NAMESPACE, "href",
                "xlink:href", "CDATA",
                SVGUtils.pathToURI(imageDef.getImagePath()));

            // We have a main transformation on the complete draft.
            // So we need here the rotate of image to get the right
            // view back.
            StringBuffer transform = new StringBuffer();
            transform.append("rotate(180 ");
            transform.append(SVGUtils.formatNumberAttribute((insertPoint.getX() +
                    (imageSizeAlongU / 2))));
            transform.append(SVGConstants.SVG_ATTRIBUTE_PATH_PLACEHOLDER);
            transform.append(SVGUtils.formatNumberAttribute((insertPoint.getY() +
                    (imageSizeAlongV / 2))));
            transform.append(")");

            SVGUtils.addAttribute(attr, SVGConstants.SVG_ATTRIBUTE_TRANSFORM,
                transform.toString());
            SVGUtils.emptyElement(handler, SVGConstants.SVG_IMAGE, attr);
        }
    }
}