[OpenLayers-Users] Drag+Line=Distance in KMs

[Steve Nelson]

Sweet. Glad I could help

Steve

2012/4/21 Imóveis Nacionais <imoveisnacionais at gmail.com>

> great, it works! just if(!firsttime) must be replaced by if(firsttime) ;-)
> thanks a lot
> alex
>
> On 4/21/12, Steve Nelson <snelson at webapper.com> wrote:
> > Dragging is a tiny bit more complex, but the logic is essentially the
> same.
> > This is totally untested, but maybe it'll get you going in the right
> > direction. I added some inline comments. Give it a whirl.
> >
> >
> > var firstClickMercator;
> > OpenLayers.Control.Click = OpenLayers.Class(OpenLayers.Control, {
> >
> > defaultHandlerOptions: {
> > 'single': true,
> > 'double': false,
> > 'pixelTolerance': 0,
> > 'stopSingle': false,
> > 'stopDouble': false
> > },
> > handleRightClicks:true,
> > initialize: function(options) {
> > this.handlerOptions = OpenLayers.Util.extend(
> > {}, this.defaultHandlerOptions
> > );
> > OpenLayers.Control.prototype.initialize.apply(
> > this, arguments
> > );
> > this.handler = new OpenLayers.Handler.Click(
> > this, {
> > 'click': this.singleClick
> > }, this.handlerOptions
> > );
> > },
> >  singleClick: function(e) {
> >   //You want to convert the xy coordinate in the e variable to a LonLat
> > var clickLonLat=map.getLonLatFromPixel(e.xy)
> >  //Projections confuse the hell out of me. But what I've learned is you
> > probably want to transform to a Mercator projection
> > var
> clickLonLatMercator=clickLonLat.transform(map.getProjectionObject(),new
> > OpenLayers.Projection("EPSG:4326"));
> >  if (!firstClick){
> >  //If this is the first store it into a global variable:
> > firstClickMercator=clickLonLatMercator
> > }else{
> >  //if the global variable firstClick already exists, calculate the
> distance
> > in KM
> > var
> >
> distanceInKM=OpenLayers.Util.distVincenty(firstClickMercator,clickLonLatMercator)
> >  //you'll have to output it where you want, this should display the value
> > in the google chrome console:
> > console.log(distanceInKM)
> >  //reset the global variable to null.
> > firstClick=null;
> > }
> > },
> >
> > });
> >
> >
> > //Define the global map:
> > var map = new OpenLayers.Map("map")
> >
> > //Add the click control to the map
> > var click = new OpenLayers.Control.Click();
> > map.addControl(click);
> > click.activate();
> >
> >
> >
> > On Fri, Apr 20, 2012 at 10:41 AM, alexe100
> > <imoveisnacionais at gmail.com>wrote:
> >
> >> Hi all , i am new here and in GEO* purposes...
> >> I am doing a web based application where i need to show some markers,
> that
> >> it aldready working.
> >> Now I need to give the oortunity to the user of drag a line on the map
> and
> >> while dragging see the distance in kms in a label box (html external
> obj)
> >> I saw already the openlayer example for distance but it has various
> >> options
> >> (and that make me confusing because i am a beginner). I did not found a
> >> (very) simple example doing this.
> >> Please, could you tell me how to do this. A littl example would be very
> >> appreciated.
> >>
> >> Thanks a lot
> >>
> >> Alex
> >>
> >> --
> >> View this message in context:
> >>
> http://osgeo-org.1560.n6.nabble.com/Drag-Line-Distance-in-KMs-tp4902194p4902194.html
> >> Sent from the OpenLayers Users mailing list archive at Nabble.com.
> >> _______________________________________________
> >> Users mailing list
> >> Users at lists.osgeo.org
> >> http://lists.osgeo.org/mailman/listinfo/openlayers-users
> >>
> >
>
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