public static GeoAPI.Geometries.ILinearRing CreateEllipse(GeoAPI.Geometries.IGeometryFactory factory,
GeoAPI.Geometries.Coordinate center, System.Drawing.SizeF size, int segmentsPerQuadrant)
{
const double piHalf = System.Math.PI * 0.5d;
var step = piHalf / segmentsPerQuadrant;
var pts = new GeoAPI.Geometries.Coordinate[4 * segmentsPerQuadrant + 1];
var angle = 0d;
for (var i = 0; i < 4 * segmentsPerQuadrant; i++)
{
pts[i] = new GeoAPI.Geometries.Coordinate(center.X + System.Math.Cos(angle) * size.Width,
center.Y + System.Math.Sin(angle) * size.Height);
angle += step;
}
pts[pts.Length - 1] = pts[0];
return factory.CreateLinearRing(pts);
}
public static GeoAPI.Geometries.ILinearRing CreateRectangle(GeoAPI.Geometries.IGeometryFactory factory,
GeoAPI.Geometries.Coordinate leftTop, GeoAPI.Geometries.Coordinate rightBottom)
{
var pts = new[]
{
leftTop,
new GeoAPI.Geometries.Coordinate(rightBottom.X, leftTop.Y),
rightBottom,
new GeoAPI.Geometries.Coordinate(leftTop.X, rightBottom.Y),
leftTop
};
return factory.CreateLinearRing(pts);
}