Circle Becomes Arc When Reopened

freddig · 22 Jun 2009, 12:33

Hi All,

Has anyone had this strange occurance with Circles. If I "push" a Circle, when I save and reopen the file the Circles (either side of the hole) have become an Arcs (see right side of attached pictures). The circle on the left stays a circle. I've had no problem with this yet, and only noticed it after my "Select Circle Entities" plugin didn't work!

Gaieus · 22 Jun 2009, 12:55

Interesting. I still have them as circles:

thomthom · 22 Jun 2009, 12:57

I can verify this behaviour on XP Pro - SU7 Pro.

Gaieus · 22 Jun 2009, 13:00

How? See my screenshot; I don't have it. I tried to make the hole two different ways;

punching the hole on a flat face and then PP'ing the surrounding rectangle
first making the box then drawing the circle and PP'ing it back to the bottom
Had the same result both times.

thomthom · 22 Jun 2009, 13:10

@gaieus said:

How? See my screenshot; I don't have it. I tried to make the hole two different ways;

punching the hole on a flat face and then PP'ing the surrounding rectangle

first making the box then drawing the circle and PP'ing it back to the bottom
Had the same result both times.

I made a square.
Drew a circle on the square - deleted the circle face
Copied the square with hole in next to itself
Push-Pulled Up (Entity is Circle at this point)
Saved and closed the file
Reopened the file (Entity was now an Arc - The circle that wasn't push-pulled remained a Circle though.)

remus · 22 Jun 2009, 13:15

I can reproduce it as well, SU7 vista 64.

Gaieus · 22 Jun 2009, 13:23

Sorry guys,although it was written in the first post,I didn't save > close > reopen. True, I can also reproduce it this way (in fact,you don't even need to copy the whole thing just do the PP)

thomthom · 22 Jun 2009, 13:25

The copy was just to reference to see if it happened to all circles.

freddig · 22 Jun 2009, 14:26

So is this likely to cause any problems? My only issue so far is my "select circles" plugin (just got to remember to "select arcs" instead).

thomthom · 22 Jun 2009, 14:58

Well that's strange:

Poking around with the API:
While the .start_angle is 0 for both - but the .end_angle is different:
Original Circle


Sketchup.active_model.selection[0].curve.end_angle.radians
> 360.0

ArcCircle


Sketchup.active_model.selection[0].curve.end_angle.radians
> 720.0

For some reason it loops around itself twice! o_O

Jim · 22 Jun 2009, 15:12

Could be because an Arc is 12-sided by default and a circle is 24-sided?

thomthom · 22 Jun 2009, 16:16

Dunno. But it's odd that a Circle entity turns into an Arc. Or in reality according to the API - Circles are ArcCurves that's 360 degrees.

thomthom · 8 Jul 2009, 10:31

FYI: I added support for bugged circles in my Selection Toys plugin. http://forums.sketchucation.com/viewtopic.php?f=180&t=14975 If you select all entities and then Right-click->Select Only->Circles it'll select all the circles - even those that SU claims are arcs and incorrectly reports as 720 degrees.