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Code to convert geometric circle to polygon using ruby
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| class ConvertCircleToPolygon | |
| EARTH_RADIUS = 6378137 | |
| def to_radians(angle_in_degrees) | |
| angle_in_degrees * Math::PI / 180 | |
| end | |
| def to_degrees(angle_in_radians) | |
| angle_in_radians * 180 / Math::PI | |
| end | |
| def calc_offset(c1, distance, bearing) | |
| lat1 = to_radians(c1[1]) | |
| lon1 = to_radians(c1[0]) | |
| dByR = distance.to_f / EARTH_RADIUS | |
| lat = Math.asin( | |
| Math.sin(lat1) * Math.cos(dByR) + | |
| Math.cos(lat1) * Math.sin(dByR) * Math.cos(bearing)) | |
| lon = lon1 + Math.atan2( | |
| Math.sin(bearing) * Math.sin(dByR) * Math.cos(lat1), | |
| Math.cos(dByR) - Math.sin(lat1) * Math.sin(lat)) | |
| [to_degrees(lon), to_degrees(lat)] | |
| end | |
| def circle_to_polygon(center, radius, vertices = 32) | |
| flatCoordinates = [] | |
| for i in 0..vertices | |
| flatCoordinates.push.concat([calc_offset(center, radius, 2 * Math::PI * i / vertices)]) | |
| end | |
| flatCoordinates.push.concat([flatCoordinates.first]) | |
| [flatCoordinates.reverse()] | |
| end | |
| end |
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