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

[Wally Atkins]

Or better yet: http://www.movable-type.co.uk/scripts/latlong.html

Look for: *Destination point given distance and bearing from start point*


On Fri, May 31, 2013 at 3:17 PM, Wally Atkins <wallyatkins at gmail.com> wrote:

> 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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