SVGTextGenerator.java

/*******************************************************************************
 * 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.common.Style;
import org.kabeja.entities.Text;
import org.kabeja.math.Bounds;
import org.kabeja.math.Point3D;
import org.kabeja.math.TransformContext;
import org.kabeja.svg.SVGConstants;
import org.kabeja.svg.SVGContext;
import org.kabeja.svg.SVGUtils;
import org.kabeja.tools.FontManager;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

public class SVGTextGenerator extends AbstractSVGSAXGenerator {
	public void toSAX(ContentHandler handler, Map svgContext, DraftEntity entity,
			TransformContext transformContext) throws SAXException {
		Text text = (Text) entity;

		AttributesImpl attr = new AttributesImpl();
		Point3D alignmentPoint = text.calculateAlignmentPoint();

		double height = text.getHeight();

		if (height == 0.0) {
			height = ((Bounds) svgContext.get(SVGContext.DRAFT_BOUNDS))
					.getHeight() * 0.005;
		}

		SVGUtils.addAttribute(attr, SVGConstants.SVG_ATTRIBUTE_FONT_SIZE,
				SVGUtils.formatNumberAttribute(height));

		// if there is a SVG font, we will use it
		if (text.getDocument().getStyle(text.getTextStyle()) != null) {
			Style style = text.getDocument().getStyle(
					text.getTextStyle());
			FontManager manager = FontManager.getInstance();
			String fontID = null;

			if (manager.hasFontDescription(style.getBigFontFile())) {
				fontID = style.getBigFontFile();
			} else if (manager.hasFontDescription(style.getFontFile())) {
				fontID = style.getFontFile();
			}

			if (fontID != null) {
				fontID = fontID.toLowerCase();

				if (fontID.endsWith(".shx")) {
					fontID = fontID.substring(0, fontID.indexOf(".shx"));
				}

				SVGUtils.addAttribute(attr,
						SVGConstants.SVG_ATTRIBUTE_FONT_FAMILY, fontID);
			}
		} else {
			// Do we need to set a default?
			// SVGUtils.addAttribute(attr,SVGConstants.SVG_ATTRIBUTE_FONT_FAMILY,"simplex");
		}

		// set the alignment
		if (!text.isUpsideDown()) {
			switch (text.getAlign()) {
			case 0:
				SVGUtils.addAttribute(attr,
						SVGConstants.SVG_ATTRIBUTE_TEXT_ANCHOR, "start");

				break;

			case 1:
				SVGUtils.addAttribute(attr,
						SVGConstants.SVG_ATTRIBUTE_TEXT_ANCHOR, "middle");

				break;

			case 2:
				SVGUtils.addAttribute(attr,
						SVGConstants.SVG_ATTRIBUTE_TEXT_ANCHOR, "end");

				break;

			case 3:
				SVGUtils.addAttribute(attr,
						SVGConstants.SVG_ATTRIBUTE_TEXT_ANCHOR, "end");

				break;

			case 4:
				SVGUtils.addAttribute(attr,
						SVGConstants.SVG_ATTRIBUTE_TEXT_ANCHOR, "middle");

				break;

			case 5:
				SVGUtils.addAttribute(attr,
						SVGConstants.SVG_ATTRIBUTE_TEXT_ANCHOR, "end");

				break;

			default:
				SVGUtils.addAttribute(attr,
						SVGConstants.SVG_ATTRIBUTE_TEXT_ANCHOR, "start");

				break;
			}
		}

		// in order to get the right text-view
		StringBuffer transform = new StringBuffer();

		if (!text.isBackward()) {
			SVGUtils.addAttribute(attr, "writing-mode", "lr-tb");
		} else {
			// SVGUtils.addAttribute(attr, "writing-mode", "rl");
			transform.append("matrix(-1 0 0 1  ");
			transform.append(SVGUtils.formatNumberAttribute(2 * alignmentPoint
					.getX()));
			transform.append(" 0)");
		}

		if (!text.isUpsideDown()) {
			transform.append("matrix(1 0 0 -1 0 ");
			transform.append(SVGUtils.formatNumberAttribute(2 * alignmentPoint
					.getY()));
			transform.append(')');
		}

		// rotation
		if (text.getRotation() != 0.0) {
			transform.append(" rotate(");
			transform.append(SVGUtils.formatNumberAttribute((-1 * text
					.getRotation())));
			transform.append(' ');
			transform.append(SVGUtils.formatNumberAttribute(alignmentPoint
					.getX()));
			transform.append(' ');
			transform.append(SVGUtils.formatNumberAttribute(alignmentPoint
					.getY()));
			transform.append(' ');
			transform.append(')');
		}

		if (text.getObliqueAngle() != 0.0) {
			transform.append(" skewX(");
			transform.append((-1 * text.getObliqueAngle()));
			transform.append(" )");

			transform.append(" translate( ");
			transform.append(SVGUtils.formatNumberAttribute(alignmentPoint
					.getY()
					* Math.tan(Math.toRadians(1 * text.getObliqueAngle()))));
			transform.append(')');
		}

		if (text.getScaleX() != 1.0) {
			
			transform.append(" translate( ");
			transform.append(SVGUtils.formatNumberAttribute(alignmentPoint.getX()));
			transform.append(",0.0)");
			
			transform.append(" scale(");
			transform.append(SVGUtils.formatNumberAttribute(text.getScaleX()));
			transform.append(",1.0)");

			
			transform.append(" translate( ");
			transform.append(SVGUtils.formatNumberAttribute(-1*alignmentPoint.getX()));
			transform.append(",0.0)");
		}

		SVGUtils.addAttribute(attr, "transform", transform.toString());

		SVGUtils.addAttribute(attr, SVGConstants.SVG_ATTRIBUTE_X, SVGUtils
				.formatNumberAttribute(alignmentPoint.getX()));
		SVGUtils.addAttribute(attr, SVGConstants.SVG_ATTRIBUTE_Y, SVGUtils
				.formatNumberAttribute(alignmentPoint.getY()));

		super.setCommonTextAttributes(attr, svgContext, text);

		SVGUtils.startElement(handler, SVGConstants.SVG_TEXT, attr);
		SVGUtils.textDocumentToSAX(handler, text.getTextDocument());
		SVGUtils.endElement(handler, SVGConstants.SVG_TEXT);
	}
}