[OpenLayers-Users] Capture screen coordinates

[Ivan Grcic]

hi,
1)

register featureAdded function in your draw control;

new OpenLayers.Control.DrawFeature(
            polygon,
            OpenLayers.Handler.Polygon,
            {
                featureAdded: function(evt){
                    var geom = evt.geometry;
                    //do what ever you want to do with it
                }
            }
        ),

2)
http://dev.openlayers.org/docs/files/OpenLayers/Map-js.html#OpenLayers.Map.getCenter

cheers

On Thu, Sep 24, 2009 at 5:40 PM, Diego Roberto
<diegorrborges at yahoo.com.br> wrote:
> Hi,
>
> - I will generate a search space as follows: User draws a polygon
> (OpenLayers.Layer.Vector) on the screen and when to draw this polygon as the
> application will return all the points that are within this polygon.
> Currently the application works this way only when the User draw the polygon
> he has to click the search button or triggering event "onclick" and calling
> the function serialize () to capture the coordinates into a JSON object.
> What I want is to eliminate the need for the User clicks the search button,
> or just make a fence on the screen capture system has the coordinates to
> perform the search. How should I proceed in this case? As the caption event
> so he finished drawing without clicking any button or trigger an onclick
> event? If there is no better way to search through what you display or link
> so I can search?
> Solution to use: OpenLayers + JSON + Java + DWR + PostGIS.
>
> Here is the code below the layers of vectors that do get to catch the
> details after the User draw on the screen to generate the search.
>
>
>              / / Layer to design for polygon generation of space research
>              rectangle = new OpenLayers.Layer.Vector ( 'Simple Search',
>              / / Style applied to the blue rectangle
>
>    (
>                      Style: OpenLayers.StyleMap new ((
>                          fillColor: "# 333399"
>                          fillOpacity: 0.5
>                      ))
>                      )
>        );
>
>              / / Layer to design for polygon generation of space research
>              polygon = new OpenLayers.Layer.Vector ( 'Search Polygon',
>                                  / / Blue Style applied to the polygon
>                                  (
>                      Style: OpenLayers.StyleMap new ((
>                          fillColor: "# 333399"
>                          fillOpacity: 0.5
>                      ))
>                      )
>        );
>
>
>                  / / Layer to design a point for the generation of space
> research
>              point = new OpenLayers.Layer.Vector ( 'Search Point');
>
>                / / Search through the rectangle is inserted into a new layer
> of rectangle on the map
>                 retanguloOptions = (sides: 4);
>          retanguloControl = new OpenLayers.Control.DrawFeature (rectangle,
>
> OpenLayers.Handler.RegularPolygon,
>                                              (handlerOptions:
> retanguloOptions));
>
>           / / Search through polygon is inserted into a new layer of polygon
> on the map
>          poligonoControl = new OpenLayers.Control.DrawFeature (polygon,
>                                              OpenLayers.Handler.Polygon);
>
>            / / Search through point is inserted a new layer of point on the
> map
>          pontoControl = new OpenLayers.Control.DrawFeature (point,
>                                              OpenLayers.Handler.Point);
>
>
>
> - Another question also must generate a search in which I capture the
> coordinates of the center of the screen to generate a buffer. User will not
> make any drawing only a select category of hospitals and click search. The
> application then captures the coordinates of the center of the screen to
> generate a buffer of 2 km of the center point. I already have the running
> buffer to know what heading to use these coordinates of the center of the
> screen (map)?
>
>
>
> Regards,
> Diego Roberto
> Phone: + 55 62 96190902
> Msn: diego_roberto at live.com
> Skype: diego.rrborges
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>



-- 
Ivan Grcic