[OpenLayers-Users] Draw a line knowing its length in meters e it's angle

[Wally Atkins]

Maybe this would do the trick for what you need?

function destination(lat, lng, dist, heading) {
      lat *= Math.PI / 180;
      lng *= Math.PI / 180;
      heading *= Math.PI / 180;

      var lat2 = Math.asin(Math.sin(lat) * Math.cos(dist) +
                           Math.cos(lat) * Math.sin(dist) *
Math.cos(heading));
      return [180 / Math.PI * lat2, 180 / Math.PI * (lng +
Math.atan2(Math.sin(heading) * Math.sin(dist) * Math.cos(lat2),
Math.cos(dist) - Math.sin(lat) * Math.sin(lat2)))];
    }

From:
https://groups.google.com/forum/?fromgroups#!topic/google-earth-browser-plugin/s1A_kizmolU


On Fri, May 31, 2013 at 2:02 PM, mail.roliveira at gmail.com <
mail.roliveira at gmail.com> wrote:

> Thanks, I will have a look.
>
>
> The move(x, y) method of OpenLayers.Geometry.Point may be helpful. But I
> don't understand the x, y arguments... What are the units of those values?
>
> this could help if I move a clone of pointA.
>
>
>
> Sent from Alto - altomail.com
>
>
>
> ------------------------------
> *From: *wallyatkins at gmail.com<wallyatkins at gmail.com>
> *To: *mail.roliveira at gmail.com<mail.roliveira at gmail.com>
> *cc: *openlayers-users at lists.osgeo.org<openlayers-users at lists.osgeo.org>
> *Sent: *Friday, May 31, 2013
> *Subject: *Re: [OpenLayers-Users] Draw a line knowing its length in
> meters e it's angle
>
>
> Maybe look into the JSTS?
>
> https://github.com/bjornharrtell/jsts
>
> On Friday, May 31, 2013, mail.roliveira at gmail.com wrote:
>
>> How do I draw a line, starting from a known point, and knowing only it's
>> length in meters and it's angle?
>>
>> Suppose I have a point at:
>>
>> PointA:
>> lat: -22.29417905166, lon: 19.022827148438
>> (EPSG:4326)
>>
>> Now I want to draw a line 500 meters long with an angle of 15 degrees (0
>> degrees is an horizontal line).
>>
>> OpenLayers.Geometry.LineString allows to draw only a point from two
>> points...
>>
>> Any ideas?
>>
>>
>> Sent from Alto - altomail.com
>>
>
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