[OpenLayers-Users] RegularPolygon as a search polygon
Brad Spencer
bradspencer at ozemail.com.au
Tue Jul 13 02:11:20 EDT 2010
Tino,
Thanks for that it really helped. This should be an example in OL as it
could help people like me.
Anyway, I have one small issue which is most likely associated with my
application. I overlay a thematic WMS layer on top of my basemap and I use
this control to create a polygon to do a getFeature request against the
CubeWerx database. So I take the geometry returned in this control and turn
it into my own vector polygon to which I bind a drag control so the user can
drag it around and reuse it. I also make sure that the thematic map overlay
is set to a ZIndex that makes sure its lower than markers, other layers,
popups and this temporary vector layer etc. However, in the process of
dragging the polygon out, the display polygon appears below my thematic
overlay. Once I release the mouse it pops to the top. So is there a way of
manipulating (resetting) a control's stretching graphic?
Cheers,
Brad....
-----Original Message-----
From: tino.desjardins at arcor.de [mailto:tino.desjardins at arcor.de]
Sent: Monday, July 12, 2010 11:07 PM
To: bradspencer at ozemail.com.au; brad at numaps.com.au; users at openlayers.org
Subject: Aw: Re: [OpenLayers-Users] RegularPolygon as a search polygon
Hello Brad,
I think the problem is your own separate EventHandler and the wrong handler
"draw". The DrawFeature-Control has an eventhandler "featureAdded". Take
this instead.
e.g.
OpenLayers.Control.NoticeControl =
OpenLayers.Class(OpenLayers.Control.DrawFeature,
{
initialize: function(layer, handler, options) {
OpenLayers.Control.DrawFeature.prototype.initialize.apply(this,
[layer, handler, options]);
},
setMap: function(map) {
this.handler.setMap(map);
OpenLayers.Control.prototype.setMap.apply(this, arguments);
},
featureAdded: function(feature) {
alert(feature.geometry.toString());
this.deleteFeature(feature);
},
deleteFeature: function(feature) {
feature.state = OpenLayers.State.DELETE;
this.layer.events.triggerEvent("afterfeaturemodified",
{feature: feature});
this.layer.drawFeature(feature);
},
CLASS_NAME: "OpenLayers.Control.NoticeControl"
});
how to use:
var polyOptions = {sides: 4};
var noticeControl = new OpenLayers.Control.NoticeControl(polygonLayer,
OpenLayers.Handler.RegularPolygon,
{handlerOptions: polyOptions});
map.addControl(noticeControl);
hope that works
Tino
----- Original Nachricht ----
Von: Brad Spencer <bradspencer at ozemail.com.au>
An: brad at numaps.com.au, users at openlayers.org
Datum: 11.07.2010 15:23
Betreff: Re: [OpenLayers-Users] RegularPolygon as a search polygon
> Guys,
>
>
>
> Still need some help on this.
>
>
>
> I have taken the simple app from examples and edited it to see if I can
> make
> this work. It works but not the way I expect it to work?
>
>
>
> See : http://staging.demos.numaps.com.au/shape_tester.html
>
>
>
> I have extended the DrawFeature control to echo out the coordinates of the
> vector generated polygon. When the control is deactivated (controlled by
> the
> 'navigate' radio) the notice function is triggered - not sure why?
>
> I am trying to trigger this function only when the control is activated.
>
>
>
> Its just not doing what I would have expected so I must be doing something
> really stupid.
>
>
>
> Can someone have a quick look at this for me?
>
>
>
> Cheers.
>
>
>
> Brad..
>
>
>
> From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
On
> Behalf Of Brad Spencer
> Sent: Friday, July 09, 2010 9:12 PM
> To: openlayers users
> Subject: [OpenLayers-Users] RegularPolygon as a search polygon
>
>
>
> Guys,
>
>
>
> I have been able to build a control to freehand digitize a polygon and
then
> launch a function to use the polygon as a search polygon in a WFS request.
>
>
>
> This works for me:
>
>
>
> drawControls = new OpenLayers.Control.DrawFeature(vectorLayer,
> OpenLayers.Handler.Polygon) ;
>
> // extend the drawcontrol with its behavior
>
> OpenLayers.Util.extend(drawControls,
>
> { draw: function (){
>
> this.polygon = new OpenLayers.Handler.Polygon(drawControls,{"done":
> this.notice}); this.polygon.activate();},
>
> notice: function (polygon)
>
> {
>
> // get vertices of polygon
> into and array of coordinate pairs
>
> var polyString =
> polygon.toString() ;
>
>
>
> // do whatever with
polygon
> linestring here
>
> .
>
> }
>
> });
>
> map.addControl(drawControls);
>
>
>
>
>
> I wanted to use the RegularPolygon feature to do the same but it does not
> launch the function in the same way after the vector geometry is
> successfully created.
>
>
>
> var polyType = 6;
>
> var rad = '';
>
> polyOptions = {sides: polyType, radius: rad, angle: 0}
>
> shapeControl = new OpenLayers.Control.DrawFeature(vectorLayer,
> OpenLayers.Handler.RegularPolygon, {handlerOptions: polyOptions});
>
> // extend the shapeControl with its behavior
>
> OpenLayers.Util.extend(shapeControl,
>
> { draw: function (){
>
> this.polygon = new
> OpenLayers.Handler.RegularPolygon(shapeControl, {"done": this.notice});
> this.polygon.activate();},
>
> notice: function (polygon)
>
> {
>
> // get vertices of polygon
> into and array of coordinate pairs
>
> var polyString =
> polygon.toString() ;
>
> // do whatever with
polygon
> linestring here
>
> .
>
>
> }
>
> });
>
>
>
> In both cases the polygon is created and drawn to the vectorLayer.
>
>
>
> Can anyone see anything obviously wrong with the second piece of code?
>
>
>
> Cheers,
>
>
>
> Brad Spencer
>
> General Manager
>
> NuMaps
>
> "DemographicDrapes"
>
> www.numaps.com.au
>
> brad at numaps.com.au
>
> 0404 841 131
>
> (02)9481 7024
>
>
>
> "DemographicDrapes
>
<http://www.numaps.com.au/numaps/index.cfm/resources/resources/apps4nsw-comp
>
> etition-winner/> wins NSW award"
>
>
>
>
>
> --------------------------------
>
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>
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