Add better line smoothing

[GoogleCodeExporter]

What steps will reproduce the problem?
1.
2.
3.

What is the expected output? What do you see instead?
The current line smoothing produces a lot of sharp corners.  Especially when 
drawing fast.  I would love to see a way to set some higher smoothing options.

What version of the product are you using? On what operating system?
v.7.3 on HC3.2.1 HTC Flyer.

Please provide any additional information below.

Original issue reported on code.google.com by cmen...@gmail.com on 9 Dec 2011 at 12:34

[GoogleCodeExporter]

Yeah, i agree. I used to work with flash,and I remember that we could choose an 
option that would automatically smooth the lines.  Its because of the smoother 
lines and image support that  I use writepad. ..

Original comment by joxn...@gmail.com on 7 Feb 2012 at 3:02

[GoogleCodeExporter]

I've noticed the same thing. I love the vector lines but for drawing quality 
artwork the jaggedness of the lines makes it frustrating

Original comment by orangef...@gmail.com on 11 Jan 2013 at 1:10

[GoogleCodeExporter]

I have added a gaussian smoothing procedure that seems to work very well (see 
topic in the Quill development group)

Original comment by m...@danik.tk on 10 Mar 2013 at 1:50