FarseerPhysics.Common.PolygonTools.createRoundedRectangle C# (CSharp) Method

		public static Vertices createRoundedRectangle( float width, float height, float xRadius, float yRadius,
													  int segments )
		{
			if( yRadius > height / 2 || xRadius > width / 2 )
				throw new Exception( "Rounding amount can't be more than half the height and width respectively." );
			if( segments < 0 )
				throw new Exception( "Segments must be zero or more." );

			//We need at least 8 vertices to create a rounded rectangle
			Debug.Assert( Settings.maxPolygonVertices >= 8 );

			var vertices = new Vertices();
			if( segments == 0 )
			{
				vertices.Add( new Vector2( width * .5f - xRadius, -height * .5f ) );
				vertices.Add( new Vector2( width * .5f, -height * .5f + yRadius ) );

				vertices.Add( new Vector2( width * .5f, height * .5f - yRadius ) );
				vertices.Add( new Vector2( width * .5f - xRadius, height * .5f ) );

				vertices.Add( new Vector2( -width * .5f + xRadius, height * .5f ) );
				vertices.Add( new Vector2( -width * .5f, height * .5f - yRadius ) );

				vertices.Add( new Vector2( -width * .5f, -height * .5f + yRadius ) );
				vertices.Add( new Vector2( -width * .5f + xRadius, -height * .5f ) );
			}
			else
			{
				int numberOfEdges = ( segments * 4 + 8 );

				float stepSize = MathHelper.TwoPi / ( numberOfEdges - 4 );
				int perPhase = numberOfEdges / 4;

				var posOffset = new Vector2( width / 2 - xRadius, height / 2 - yRadius );
				vertices.Add( posOffset + new Vector2( xRadius, -yRadius + yRadius ) );
				short phase = 0;
				for( int i = 1; i < numberOfEdges; i++ )
				{
					if( i - perPhase == 0 || i - perPhase * 3 == 0 )
					{
						posOffset.X *= -1;
						phase--;
					}
					else if( i - perPhase * 2 == 0 )
					{
						posOffset.Y *= -1;
						phase--;
					}

					vertices.Add( posOffset + new Vector2( xRadius * (float)Math.Cos( stepSize * -( i + phase ) ),
														 -yRadius * (float)Math.Sin( stepSize * -( i + phase ) ) ) );
				}
			}

			return vertices;
		}