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Of course this is no different with polylines, and you can of course use polylines to trim other geometry back to. NET API to add dynamic labels to polylines for segment length, azimuth.When using the trim command, you tend to specify geometry to trim lines back to. Labeling AutoCAD objects (line, arc polyline) Note labels Expressions. 2.AutoCAD will trim back to the next found vertices of the polyline: So there we go not exactly the most revolutionary tip in the world, but it could save you some time and gives a clearer instruction to AutoCAD, thereby reducing the calculation overhead and crash chance. 2) (if its a lot of lines) DXE the lines, get length property, use Excel to sum the column. Im sure someone will come up with better but heres what I would try: Trace a PLine over your lines, get length of PLine.

AutoCAD® has to compare the point you picked with all other objects in the drawing to detect places to trim back to. But on a more complex polyline, with more information in the drawing this will take longer. A lot of people would invoke the TRIM command, hit spacebar or enter to select trimming back to everything, and trim away the individual parts of the polyline (the coloured parts below):Ok, I admit that this gets the job done. For example, you may have a polyline that looks like below:Lets say you want to trim away the whole horizontal portion of the polyline.