What problem does it solve? Construction drawings contain three visually identical line types—wall surfaces, column faces, and symbols—that must be treated differently when tracing room boundaries. Treating them as one produces silently wrong area measurements: flood fill leaks through door openings, symbols inflate or distort boundaries, and numbers that look plausible hide geometrically wrong shapes. ## Core Features & Use Cases - Line classification before tracing: Separates wall surfaces (long parallel pairs), column faces (short structural segments), and symbols (labels, door swings, level triangles, fixtures) so only structural lines act as barriers. - Rectilinear outline tracing: Traces pixel-boundary outlines with horizontal and vertical segments only, snapping edges to the inner face of wall ink and collapsing staircase artifacts into right-angle corners. - Deterministic measurement: Forbids language models in the click-to-number path so the same room always yields the same area, with coordinates stored in page points independent of zoom level. - Use Case: A user clicks a hospital floor plan room in the ESTIMETR app; the skill guides tracing the boundary along inner wall faces, detouring around columns, ignoring tile grids and fixtures, and converting pixels to metres for a reliable area figure. ## Quick Start Use the drawing-geometry skill to trace the boundary of the room I click on this floor plan and compute its area in square metres.
