Posted by Rallaz on Jan 28, 2014; 4:18pm
URL: https://forum.librecad.org/I-want-to-help-tp5709375p5709434.html

I Dongxu,

Sorry for the delay.

I use "info->list entities"

brief explanation:
pol1: 0,0; 100,0; 50,50; close
pol2 (fake closed): 0,0; 100,0; 50,50; 0,0

Round first & last segment by radius 5:
pol1:
    Closed: Yes
    Vertices:
    in point: X=12.0711 Y=0
    in point: X=100 Y=0
    in point: X=50 Y=50
    in point: X=8.5355 Y=8.5355
    curvature: 0.6682

pol2 (bad bug present):
    Closed: No
    Vertices:
    in point: X=12.0711 Y=0
    in point: X=100 Y=0
    curvature: 0.6682
    in point: X=12.0711 Y=0
    in point: X=50 Y=50
    in point: X=8.5355 Y=8.5355

pol2 (patch aplied & correct pol):
    Closed: No
    Vertices:
    in point: X=12.0711 Y=0
    in point: X=100 Y=0
    in point: X=50 Y=50
    in point: X=8.5355 Y=8.5355
    curvature: 0.6682
    in point: X=12.0711 Y=0

Or directly read in dxf:
10 => x code
20 => y code
42 => bulge code