org.geomajas.internal.rendering.writer.svg.SvgLabelTileWriter Maven / Gradle / Ivy

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/*
 * This is part of Geomajas, a GIS framework, http://www.geomajas.org/.
 *
 * Copyright 2008-2016 Geosparc nv, http://www.geosparc.com/, Belgium.
 *
 * The program is available in open source according to the GNU Affero
 * General Public License. All contributions in this program are covered
 * by the Geomajas Contributors License Agreement. For full licensing
 * details, see LICENSE.txt in the project root.
 */

package org.geomajas.internal.rendering.writer.svg;

import java.awt.geom.Rectangle2D;

import org.geomajas.configuration.FeatureStyleInfo;
import org.geomajas.configuration.FontStyleInfo;
import org.geomajas.configuration.LabelStyleInfo;
import org.geomajas.internal.rendering.writer.GraphicsWriter;
import org.geomajas.layer.feature.InternalFeature;
import org.geomajas.layer.tile.InternalTile;
import org.geomajas.rendering.GraphicsDocument;
import org.geomajas.rendering.RenderException;
import org.geomajas.service.GeoService;
import org.geomajas.service.TextService;
import org.geotools.geometry.jts.GeometryCoordinateSequenceTransformer;
import org.opengis.referencing.operation.TransformException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.Point;

/**
 * Writer for tile labels.
 * 
 * @author Jan De Moerloose
 * @author Pieter De Graef
 */
public class SvgLabelTileWriter implements GraphicsWriter {

	private final Logger log = LoggerFactory.getLogger(SvgLabelTileWriter.class);

	private final GeometryFactory factory;

	private final GeometryCoordinateSequenceTransformer transformer;

	private final LabelStyleInfo labelStyle;

	private final GeoService geoService;

	private final TextService textService;

	public SvgLabelTileWriter(GeometryCoordinateSequenceTransformer transformer, LabelStyleInfo labelStyle,
			GeoService geoService, TextService textService) {
		this.transformer = transformer;
		this.labelStyle = labelStyle;
		this.geoService = geoService;
		this.textService = textService;
		this.factory = new GeometryFactory();
	}

	public void writeObject(Object object, GraphicsDocument document, boolean asChild) throws RenderException {
		InternalTile tile = (InternalTile) object;
		FeatureStyleInfo bgStyle = labelStyle.getBackgroundStyle();
		document.writeElement("g", asChild);
		document.writeId("labels." + tile.getCode().toString());
		for (InternalFeature feature : tile.getFeatures()) {
			Coordinate pos = geoService.calcDefaultLabelPosition(feature);
			if (null != pos) {
				Point p = factory.createPoint(pos);
				Point labelPos;
				try {
					String labelString = feature.getLabel();
					if (null != labelString && labelString.length() > 0) {
						labelPos = (Point) transformer.transform(p);
						boolean createChild = true;

						Rectangle2D textBox = textService.getStringBounds(labelString, labelStyle.getFontStyle());
						document.writeElement("rect", createChild);
						document.writeAttribute("id", feature.getId() + ".lblBG");
						document.writeAttribute("x", labelPos.getX() - Math.round(textBox.getWidth() / 2));
						document.writeAttribute("y", labelPos.getY() - Math.round(textBox.getHeight()));
						document.writeAttribute("width", Math.round(textBox.getWidth()));
						document.writeAttribute("height", Math.round(textBox.getHeight()));
						document.writeAttribute("style", getCssStyle(bgStyle));
						createChild = false;

						// Text:
						document.writeElement("text", createChild);
						document.writeAttribute("id", feature.getId() + ".lblTXT");
						document.writeAttribute("x", labelPos.getX());
						// pull up baseline position to accommodate for descent
						document.writeAttribute("y", labelPos.getY() - Math.round(textBox.getMaxY()));
						// TODO: config option, center label
						document.writeAttribute("text-anchor", "middle");
						document.writeAttribute("style", getCssStyle(labelStyle.getFontStyle()));
						document.writeTextNode(labelString);
					}
					document.closeElement();
				} catch (TransformException e) {
					log.warn("Label for " + feature.getId() + " could not be written!");
				}
			}
		}
		document.closeElement();
	}
	
	private String getCssStyle(FontStyleInfo style) {
		StringBuilder css = new StringBuilder();
		if (StringUtils.hasText(style.getColor())) {
			css.append("fill:");
			css.append(style.getColor());
			css.append(";");
		}
		if (StringUtils.hasText(style.getFamily())) {
			css.append("font-family:");
			css.append(style.getFamily());
			css.append(";");
		}
		if (StringUtils.hasText(style.getStyle())) {
			css.append("font-style:");
			css.append(style.getStyle());
			css.append(";");
		}
		if (StringUtils.hasText(style.getWeight())) {
			css.append("font-weight:");
			css.append(style.getWeight());
			css.append(";");
		}
		if (style.getSize() >= 0) {
			css.append("font-size:");
			css.append(style.getSize());
			css.append("px;");
		}
		return css.toString();
	}


	private String getCssStyle(FeatureStyleInfo style) {
		StringBuilder css = new StringBuilder();
		if (style.getFillColor() != null && !"".equals(style.getFillColor())) {
			css.append("fill:");
			css.append(style.getFillColor());
			css.append(";");
		}
		if (style.getFillOpacity() != -1) {
			css.append("fill-opacity:");
			css.append(style.getFillOpacity());
			css.append(";");
		}
		if (style.getStrokeColor() != null && !"".equals(style.getStrokeColor())) {
			css.append("stroke:");
			css.append(style.getStrokeColor());
			css.append(";");
		}
		if (style.getStrokeOpacity() != -1) {
			css.append("stroke-opacity:");
			css.append(style.getStrokeOpacity());
			css.append(";");
		}
		if (style.getStrokeWidth() >= 0) {
			css.append("stroke-width:");
			css.append(style.getStrokeWidth());
			css.append(";");
		}
		return css.toString();
	}
	
}