All line axial map is a set of lines made up of all lines drawn tangent to vertices that can see each other.
All-line axial map
Sources
Hillier, B. (1996, 2007), Space is the Machine: A Configurational Theory of Architecture. Space Syntax: London, UK. pp.271
Penn, A., Conroy, R., Dalton, N., Dekker, L., Mottram, C.,Turner, A. (1997), Intelligent architecture: new tools for the three dimensional analysis of space and built form, in Proceedings of the 1st International Symposium on Space Syntax University College London, London, pp 30.1-30.19. pp. 30.3-4
Turner, A., Penn, A., & Hillier, B. (2005), An algorithmic definition of the axial map. Environment and Planning B: Planning and Design 32(3):425-444