CircularString support

[c-martinez]

As far as I can see, circularstring objects are not yet supported. Are there any plans to support this and other curve types?

[arthur-e]

I have no plans to add this feature but welcome any pull requests that include it.

[ffflabs]

Circular strings are not supported on GeoJSON spec. Therefore, any implementation would require to transform such curves to an approximated linear geometry of an arbitrary presicion (see the implementation for google.maps.Circle)

Wicket/wicket-gmap3.js

Lines 415 to 444 in ab38c17

	if (obj.constructor === google.maps.Circle) {
	var point = obj.getCenter();
	var radius = obj.getRadius();
	verts = [];
	var d2r = Math.PI / 180; // degrees to radians
	var r2d = 180 / Math.PI; // radians to degrees
	radius = radius / 1609; // meters to miles
	var earthsradius = 3963; // 3963 is the radius of the earth in miles
	var num_seg = 32; // number of segments used to approximate a circle
	var rlat = (radius / earthsradius) * r2d;
	var rlng = rlat / Math.cos(point.lat() * d2r);
	for (var n = 0; n <= num_seg; n++) {
	var theta = Math.PI * (n / (num_seg / 2));
	lng = point.lng() + (rlng * Math.cos(theta)); // center a + radius x * cos(theta)
	lat = point.lat() + (rlat * Math.sin(theta)); // center b + radius y * sin(theta)
	verts.push({
	x: lng,
	y: lat
	});
	}
	response = {
	type: 'polygon',
	components: [verts]
	};
	return response;
	}

it would be overkill to implement this processing in the frontend, as the conversion from circularstrings can be already done in the backend. For example in PostGIS:

SELECT ST_AsText(ST_CurveToLine(ST_GeomFromText('CIRCULARSTRING(-67 -40,-73 -40,-67 -40)')))