QCAD Bugtracker

  • Status Closed
  • Percent Complete
  • Task Type Feature Request
  • Category QCAD (main)
  • Assigned To
  • Operating System All
  • Severity Low
  • Priority Very Low
  • Reported Version 3.4.5
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: QCAD Bugtracker
Opened by Väinö Forss - 19.01.2014
Last edited by Andrew - 21.01.2014

FS#1012 - Make threshold from which arcs are approximated as lines configurable

Tried to draw a guitar and when drawing top arch (R=10600 mm), I noticed that when arc length is less than 5% (in ths case less than 530 mm) of arcs radius arc appears totally straight both in screen and print.
Data is stored right, details are right, reference points are right, snap on entity goes right, but the line appears totally straight.

I have iMac mid 2011 with Mavericks and latest Qcad.

Closed by  Andrew
21.01.2014 14:17
Reason for closing:  Implemented
Additional comments about closing:  

https://github.com/qcad/qcad/commit /3b4b9d9e6856d0156d173fdf4eabbe08f48e31b 2

Anonymous Submitter commented on 20.01.2014 11:55

This is expected geometric principle. Try manually using a compass and pencil you will get the same result with such short arc lengths.

To achieve what you need try using the spline tools, maybe the 'Fit to Points' option.

Andrew commented on 20.01.2014 15:19

This is indeed expected behavior.
There is a threshold below which QCAD approximates arcs as straight lines.
I will change this report into a feature request to make that threshold configurable.


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