Short description
Purpose: Automatically connect two open or parallel-like entities and merge them into one continuous polyline Supported objects: LWPOLYLINE, LINE, ARC, SPLINE Usage style: Cleanup or closing gaps between two aligned open objects
Command:
Command name: CloseParallelPolylines How to run: Type CLOSEPARALLELPOLYLINES and press Enter User prompt: Select two open polylines, arcs, splines, or lines Selection filter: Only accepts LWPOLYLINE, LINE, ARC, SPLINE
Description:
This routine takes exactly two valid open curve objects, forces polylines open if closed, connects their start points and end points using new LINE entities, then merges everything into one polyline using PEDIT join. System prompts are suppressed and restored afterward for clean automated processing.
Helper function: (if any)
• System variable handling Saves CMDECHO and PEDITACCEPT, forces silent and auto-accept mode, restores afterward • Entity type validator Converts each selection into a VLA object and verifies type (Polyline, Line, Arc, Spline) • Polyline opener Closed LWPOLYLINE objects are automatically set to open before processing • get-pts helper Returns start and end points of any supported object type • Selection set builder Collects both main entities and the two connector lines for a final PEDIT join
Functionalities:
• Entity filtering Skips unsupported types and informs the user • Count enforcement Ensures exactly two valid entities; warns if fewer or more • Automatic opening of polylines Closed LWPOLYLINE is forced open with a status message • Endpoint connection Creates LINE from start-to-start and end-to-end via ENTMAKEX • Automatic joining Uses PEDIT multiple and join to merge all entities into one polyline • Failure handling Gracefully aborts with a message if selection invalid or empty
Result:
• Geometric result Produces one polyline formed from the two originals plus two connectors • Drawing cleanup Converts parallel or open shapes into a single clean polyline ready for editing • Environment safety All system variables restored to previous values
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