[etoys-dev] [etoys-notify] [JIRA] Created: (SQ-1141) Sector does not always display straight lines when heading is not 0.

[Steve Thomas]

My problem was it was more than 1 pixel from straight.  See image below:

[image: Inline image 2]

So I guess I don't understand why the X value for pts A and B can't be
equal (same for the Y value of A and C).

Below is a 180 degree angle that is a pixel off.
[image: Inline image 3]

WARNING - I am about to make a comment on code I do NOT fully understand
(let alone the vagueries of sin/cos or floating point arithmetic is Squeak,
but that never stopped me before :D)

Perhaps if we started with 3 vertices instead of two and calculated only
the points on the Circle.

Cheers,
Stephen

On Sat, Dec 8, 2012 at 12:22 PM, David Corking <lists at dcorking.com> wrote:

> > To re-create:
> > 1) Set a sector to angle=90
> > 2) increase angle by 90
> >
> > When heading is not 0 the straight lines in the sector, are not straight.
>
> I played with sectors for a while and I could not reproduce this. For
> me, it was never more than one or two pixels from straight.
>
> Could you provide more detail please?
>
> David
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> etoys-dev at squeakland.org
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