/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
* (c) 2001 - 2013 OpenPlans
* This code is licensed under the GPL 2.0 license, available at the root
* application directory.
*/
package org.geoserver.web.istyle;
import java.io.StringWriter;
import java.util.Random;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.markup.html.IHeaderContributor;
import org.apache.wicket.markup.html.IHeaderResponse;
import org.apache.wicket.markup.html.panel.Panel;
import org.geoserver.catalog.LayerInfo;
import org.geoserver.catalog.StyleInfo;
import org.geotools.geometry.jts.ReferencedEnvelope;
import freemarker.template.Configuration;
import freemarker.template.SimpleHash;
import freemarker.template.Template;
public class OpenLayersMapPanel extends Panel implements IHeaderContributor {
/**
* freemarker template configuration
*/
final static Configuration config;
static {
config = new Configuration();
config.setClassForTemplateLoading(OpenLayersMapPanel.class, "");
}
final Random rand = new Random();
LayerInfo layer;
StyleInfo style;
public OpenLayersMapPanel(String id, LayerInfo layer) {
super(id);
setOutputMarkupId(true);
this.layer = layer;
this.style = layer.getDefaultStyle();
}
public LayerInfo getCurrentLayer() {
return layer;
}
public StyleInfo getCurrentStyle() {
return style;
}
public void renderHead(IHeaderResponse response) {
try {
//render css
SimpleHash model = new SimpleHash();
model.put("markupId", getMarkupId());
response.renderString( renderTemplate("OL-css.ftl", model) );
//TODO: point back to GeoServer
response.renderJavascriptReference("http://openlayers.org/api/OpenLayers.js");
model.put("layers", layer.getName());
model.put("styles", style.getName());
bbox(layer, model);
//render
model.put("ran", rand.nextInt());
response.renderOnLoadJavascript(renderTemplate("OL-onload.ftl", model));
}
catch( Exception e ) {
throw new RuntimeException(e);
}
}
public void update(LayerInfo layer, StyleInfo style, AjaxRequestTarget target) {
layer = layer != null ? layer : this.layer;
if (style == null) {
if (!layer.equals(this.layer)) {
//no style specified, and the layer was changed
style = layer.getDefaultStyle();
}
else {
//no style specified and layer did not change, do not change style
}
}
try {
SimpleHash model = new SimpleHash();
model.put("markupId", getMarkupId());
model.put("layers", layer.getName());
model.put("styles", style.getName());
bbox(layer, model);
model.put("ran", rand.nextInt());
model.put("layerChanged", !layer.equals(this.layer));
target.appendJavascript(renderTemplate("OL-update.ftl", model));
this.layer = layer;
this.style = style;
}
catch( Exception e ) {
throw new RuntimeException(e);
}
}
void bbox(LayerInfo layer, SimpleHash model) throws Exception {
ReferencedEnvelope bbox = layer.getResource().boundingBox();
String srs = layer.getResource().getSRS();
if ( bbox == null ) {
bbox = layer.getResource().getLatLonBoundingBox();
srs = "EPSG:4326";
}
if ( bbox == null ) {
bbox = new ReferencedEnvelope(-180,-90,180,90, null);
srs = "EPSG:4326";
}
model.put("minX", bbox.getMinX());
model.put("minY", bbox.getMinY());
model.put("maxX", bbox.getMaxX());
model.put("maxY", bbox.getMaxY());
model.put("srs", srs);
model.put("res", Math.max(bbox.getHeight(),bbox.getWidth())/256d);
}
String renderTemplate(String t, Object model) throws Exception {
Template template = config.getTemplate(t);
StringWriter writer = new StringWriter();
template.process(model, writer);
return writer.toString();
}
}