Google earth doesn't provide polygon primitives, leaving you to generate them as a series of points.
Given only a center-point (longitude/latitude) and radius, this Gem makes it easy to create (n) sided polygons (sufficient sides giving a circle) or stars, for inclusion in a KML file.
All credit to Nick Galbreath for the original code, and for providing it in a portable format. Thanks! (http://blog.client9.com/2007/09/drawing-circles-and-stars-on-google.html)
Add this line to your application's Gemfile:
gem 'kml_polygon'
And then execute:
$ bundle
Or install it yourself as:
$ gem install kml_polygon
kml_regular_polygon(longitude, latitude, radius, [sides=20, rotate=0])
kml_star(longitude, latitude, radius, inner_radius, [sides=10, rotate=0])
Returns a string suitable for adding into a KML file.
kml_regular_polygon(longitude, latitude, radius, [sides=0, rotate=0])
Regular polygon
longitude, latitude - center point in decimal degrees
radius - radius in meters
segments - number of sides, > 20 looks like a circle (optional, default: 20)
rotate - rotate polygon <rotate> degrees (optional, default: 0)
kml_star(longitude, latitude, radius, inner_radius, [sides=10, rotate=0])
Make a "star" or "burst" pattern
longitude, latitude - center point in decimal degrees
radius - radius in meters
inner_radius - radius in meters, typically < outer_radius
segments - number of "points" on the star (optional, default: 10)
rotate - rotate polygon by <rotate> degrees (optional, default: 0)
# kml_polygon_example.rb
include kml_polygon
circle = kml_regular_polygon(-95, 50, 70000)
star = kml_star(-95,45, 70000, 50000)
puts "<kml><Document>
<Style id='polygon1'><PolyStyle><color>7fff0000</color></PolyStyle></Style>
<Style id='polygon2'><PolyStyle><color>7f0000ff</color></PolyStyle></Style>
<Placemark><styleUrl>polygon1</styleUrl><Polygon>" << circle << "</Polygon></Placemark>
<Placemark><styleUrl>polygon2</styleUrl><Polygon>" << star << "</Polygon></Placemark>
</Document></kml>"
Outputs a minimal but funtional KML file with one circle and one star in semi-transparent colors.
- Fork it (
git clone git://github.com/mbrookes/kml_polygon.git) - Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create new Pull Request
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