/*
* This is part of Geomajas, a GIS framework, http://www.geomajas.org/.
*
* Copyright 2008-2011 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 GeometryFactory factory;
private GeometryCoordinateSequenceTransformer transformer;
private LabelStyleInfo labelStyle;
private GeoService geoService;
private 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();
}
}