hi again!
I just finished a rough draft of a GDirections class for GMap2. this is
a standalone class, no modifications at the existing resources/classes
are necessary.
it seems to work in my simple setting - this can also be updated with ajax.
the implementation has to override getJSadd() , since it is not
constructed with a constructor.
please have a look at the correctness, as this is my first custom
component i've written for wicket.
open questions for me: is there a better way to access the core maps object?
final String markupId = getParent().get("map").getMarkupId();
String jsVar = "directions" + markupId;
sb.append("var ").append(jsVar).append(" = new
GDirections(Wicket.maps['").append(markupId).append("'].map");
i have two concerns here:
1) accessing the map id via getParent().get("map").getMarkupId() -
unfortunately the "map" variable in GMap2 is private without an
accessor. otherwise I could have written getParent().getMap().getMarkupId().
2) hardcoding the Wicket.maps[''].map javascript reference - is there a
better way to obtain this from the parent?
possible features missing:
*) changing of markers via GEvent.addListener(jsVar,"load"...
*) somehow obtain the results (length) of routes. - any idea on this?
*) change the type of route (don't use highways, by foot, by public
transport)
-----------------
import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import wicket.contrib.gmap.api.GEvent;
import wicket.contrib.gmap.api.GLatLng;
import wicket.contrib.gmap.api.GOverlay;
import wicket.contrib.gmap.js.Array;
public class GDirections extends GOverlay {
private Component writeOutPutTo;
private final GLatLng[] waypoints;
private final boolean writeOutput;
public GDirections(GLatLng... gLatLngs) {
this(null, gLatLngs);
}
public GDirections(Component writeOutPutTo, GLatLng... gLatLngs) {
this.writeOutPutTo = writeOutPutTo;
waypoints = gLatLngs;
writeOutput = writeOutPutTo != null;
}
@Override
protected String getJSconstructor() {
return null;
}
@Override
public String getJSadd() {
Array array = new Array();
for (GLatLng gLatLng : waypoints) {
array.add(gLatLng.getJSconstructor());
}
final StringBuffer sb = new StringBuffer();
final String markupId = getParent().get("map").getMarkupId();
String jsVar = "directions" + markupId;
sb.append("var ").append(jsVar).append(" = new
GDirections(Wicket.maps['").append(markupId).append("'].map");
if (writeOutput) {
sb.append(", document.getElementById('");
sb.append(writeOutPutTo.getMarkupId());
sb.append("')");
}
sb.append(");");
sb.append(jsVar + ".loadFromWaypoints(");
appendCoordArray(sb, waypoints);
sb.append(");");
sb.deleteCharAt(sb.length() - 1);
return sb.toString();
}
/**
* produces a string like
*
["37.600470,-122.384050","37.789010,-122.425420","38.029940,-122.255420","39.026450,-119.945700"]
*
* @param sb StringBuffer to write into
* @param array list of Waypoints
*/
private void appendCoordArray(final StringBuffer sb, GLatLng[] array) {
sb.append("[");
for (GLatLng coord : array) {
sb.append("\"").append(coord.getLat()).append(",").append(coord.getLng()).append("\"");
sb.append(",");
}
sb.deleteCharAt(sb.length() - 1);
sb.append("]");
}
@Override
protected void updateOnAjaxCall(AjaxRequestTarget target, GEvent
overlayEvent) {
//no clue
}
}
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