Package org.geomajas.internal.rendering.writer.vml

Source Code of org.geomajas.internal.rendering.writer.vml.VmlFeatureWriter

/*
* 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.vml;

import org.geomajas.configuration.FeatureStyleInfo;
import org.geomajas.configuration.ImageInfo;
import org.geomajas.configuration.RectInfo;
import org.geomajas.configuration.SymbolInfo;
import org.geomajas.internal.rendering.writer.GraphicsWriter;
import org.geomajas.layer.LayerType;
import org.geomajas.layer.feature.InternalFeature;
import org.geomajas.rendering.GraphicsDocument;
import org.geomajas.rendering.RenderException;
import org.geotools.geometry.jts.GeometryCoordinateSequenceTransformer;
import org.opengis.referencing.operation.TransformException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;

/**
* Vml writer for features.
*
* @author Pieter De Graef
* @author Jan De Moerloose
*/
public class VmlFeatureWriter implements GraphicsWriter {

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

  private GeometryCoordinateSequenceTransformer transformer;

  private int coordWidth;

  private int coordHeight;

  public VmlFeatureWriter(GeometryCoordinateSequenceTransformer transformer, int coordWidth, int coordHeight) {
    this.transformer = transformer;
    this.coordWidth = coordWidth;
    this.coordHeight = coordHeight;
  }

  public void writeObject(Object object, GraphicsDocument document, boolean asChild) throws RenderException {
    try {
      InternalFeature feature = (InternalFeature) object;
      Geometry geom = feature.getGeometry();
      if (feature.isClipped()) {
        geom = feature.getClippedGeometry();
      }
      geom = transformer.transform(geom);
      if (isPointLike(feature)) {
        if (feature.getStyleInfo().getSymbol() != null) {
          SymbolInfo info = feature.getStyleInfo().getSymbol();
          for (Coordinate coordinate : geom.getCoordinates()) {
            if (info.getRect() != null) {
              writeRectangle(document, coordinate, feature, info.getRect());
            } else if (info.getCircle() != null) {
              RectInfo rectInfo = new RectInfo();
              rectInfo.setW(info.getCircle().getR() * 2);
              rectInfo.setH(info.getCircle().getR() * 2);
              writeRectangle(document, coordinate, feature, rectInfo);
            } else if (info.getImage() != null) {
              writeImage(document, coordinate, feature, info.getImage());
            }
          }
        }
      } else {
        document.writeObject(geom, asChild);
        document.writeAttribute("style", "WIDTH: 100%; HEIGHT: 100%");
        document.writeAttribute("coordsize", coordWidth + "," + coordHeight);
        document.writeAttribute("type", "#" + feature.getStyleInfo().getStyleId());
        document.writeAttribute("id", feature.getId());
      }
    } catch (TransformException e) {
      log.warn("could not render feature");
    }
  }
 
  private void writeImage(GraphicsDocument document, Coordinate coordinate, InternalFeature feature,
      ImageInfo imageInfo) throws RenderException {
    document.writeElement("vml:image", true);
    document.writeAttribute("id", feature.getId());
    int width = imageInfo.getWidth();
    int height = imageInfo.getHeight();
    int left = (int) coordinate.x - width / 2;
    int top = (int) coordinate.y - height / 2;
    document.writeAttribute("style", "WIDTH: " + width + "px; HEIGHT: " + height + "px;TOP: " + top + "px; LEFT: "
        + left + "px;");
    document.writeAttribute("src", imageInfo.getHref());
    document.closeElement();
  }

  private void writeRectangle(GraphicsDocument document, Coordinate coordinate, InternalFeature feature,
      RectInfo rectInfo) throws RenderException {
    document.writeElement("vml:rect", true);
    document.writeAttribute("id", feature.getId());
    int width = (int) rectInfo.getW();
    int height = (int) rectInfo.getH();
    int left = (int) coordinate.x - width / 2;
    int top = (int) coordinate.y - height / 2;
    document.writeAttribute("style", "WIDTH: " + width + "px; HEIGHT: " + height + "px;TOP: " + top + "px; LEFT: "
        + left + "px;");
    FeatureStyleInfo style = feature.getStyleInfo();
    document.writeAttribute("fillcolor", style.getFillColor());
    document.writeAttribute("strokecolor", style.getStrokeColor());
    document.writeAttribute("strokeweight", style.getStrokeWidth());

    // Rect-fill element:
    document.writeElement("vml:fill", true);
    document.writeAttribute("opacity", Float.toString(style.getFillOpacity()));
    document.closeElement();

    // Rect-stroke element:
    document.writeElement("vml:stroke", true);
    document.writeAttribute("opacity", Float.toString(style.getStrokeOpacity()));
    document.closeElement();

    // Rect element
    document.closeElement();
  }

  private boolean isPointLike(InternalFeature feature) {
    return feature.getLayer().getLayerInfo().getLayerType() == LayerType.POINT
        || feature.getLayer().getLayerInfo().getLayerType() == LayerType.MULTIPOINT;
  }
}
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