This tracery pattern is a detail that normally does not occur as a single design element but as part of a more complex composition that fulfills Gothic arches. Drawing Gothic tracery is not difficult, though basic knowledge of geometric drawing is still required (drawing plane figures). This Gothic tracery window pattern has been properly drawn using geometric drawing procedures, which is not difficult to do in 2D CAD software.
Based on this Gothic tracery pattern we have also drawn a 3D model that you can download here: 3D models of gothic window tracery