Mono.TextEditor.TextViewMargin.RoundedRectangle C# (CSharp) Method

		public static void RoundedRectangle(Cairo.Context cr, double x, double y, double w, double h,
		                                    double r, CairoCorners corners, bool topBottomFallsThrough)
		{
			if(topBottomFallsThrough && corners == CairoCorners.None) {
				cr.MoveTo(x, y - r);
				cr.LineTo(x, y + h + r);
				cr.MoveTo(x + w, y - r);
				cr.LineTo(x + w, y + h + r);
				return;
			} else if(r < 0.0001 || corners == CairoCorners.None) {
				cr.Rectangle(x, y, w, h);
				return;
			}
			
			if((corners & (CairoCorners.TopLeft | CairoCorners.TopRight)) == 0 && topBottomFallsThrough) {
				y -= r;
				h += r;
				cr.MoveTo(x + w, y);
			} else {
				if((corners & CairoCorners.TopLeft) != 0) {
					cr.MoveTo(x + r, y);
				} else {
					cr.MoveTo(x, y);
				}
				if((corners & CairoCorners.TopRight) != 0) {
					cr.Arc(x + w - r, y + r, r, System.Math.PI * 1.5, System.Math.PI * 2);
				} else {
					cr.LineTo(x + w, y);
				}
			}
			
			if((corners & (CairoCorners.BottomLeft | CairoCorners.BottomRight)) == 0 && topBottomFallsThrough) {
				h += r;
				cr.LineTo(x + w, y + h);
				cr.MoveTo(x, y + h);
				cr.LineTo(x, y + r);
				cr.Arc(x + r, y + r, r, System.Math.PI, System.Math.PI * 1.5);
			} else {
				if((corners & CairoCorners.BottomRight) != 0) {
					cr.Arc(x + w - r, y + h - r, r, 0, System.Math.PI * 0.5);
				} else {
					cr.LineTo(x + w, y + h);
				}
				
				if((corners & CairoCorners.BottomLeft) != 0) {
					cr.Arc(x + r, y + h - r, r, System.Math.PI * 0.5, System.Math.PI);
				} else {
					cr.LineTo(x, y + h);
				}
				
				if((corners & CairoCorners.TopLeft) != 0) {
					cr.Arc(x + r, y + r, r, System.Math.PI, System.Math.PI * 1.5);
				} else {
					cr.LineTo(x, y);
				}
			}
		}