Research on Marking Methods for Opening and Closing Information of Building Doors, Windows, and Curtain Walls

The opening and closing of openable leaves constitute a key performance characteristic of door, window and curtain wall products, and the accurate extraction of opening and closing parameters is crucial for characterizing their operational capabilities. This study treats the opening and closing of openable leaves as spatial displacements of an object. Based on the theory of geometric transformations in computer graphics, it establishes a displacement transformation matrix for characteristic points representing maximum opening capacity, thereby extracting opening and closing information for different opening and closing modes. Analysis of existing opening and closing information for openable leaves in doors, windows and curtain walls demonstrates that this method can uniquely determine the displacement parameters characterizing the leaf’s opening capacity. It also helps to reduce the number of opening and closing information types and avoids the need to describe the leaf’s own deformation and displacement trajectory. A complete description of the leaf’s opening capacity can be achieved using just the following three parameters: displacement type, direction and magnitude.