# [Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] Re: #5307 Skyline Refinements (Rounded Boxes and Rotated Ellipses)

```Hi David,

I'm not rotating any skylines.
It's just a problem of quantisation, i.e. intermediate points:```
```
Basically, ** the number of points** for drawing the ellipse is calculated from
the circumference by scaling the radii, but currently, we just multiply the
x-radius by the trans.xx value etc.. This does not work anymore as soon as
there is any rotation involved, because this is nothing but the projection on
the x-axis.
In a 90° rotation, currently the radii collapse to length 0, so does the
circumference of the ellipse and we get 0 quantisation points and,
consequently, the skyline collapes.

When using the full transformation matrix (i.e. yx and xy values as well) for
calculating the lenth of the transformed radii, everything will work fine.

All the best,
Torsten

---

** [issues:#5307] Skyline Refinements (Rounded Boxes and Rotated Ellipses)**

**Status:** Started
**Labels:** re
**Created:** Sun Apr 15, 2018 09:46 PM UTC by Torsten Hämmerle
**Last Updated:** Sun Apr 15, 2018 10:23 PM UTC
**Owner:** Torsten Hämmerle
**Attachments:**

-
[skylines-boxes-2-19-81.png](https://sourceforge.net/p/testlilyissues/issues/5307/attachment/skylines-boxes-2-19-81.png)
(82.3 kB; image/png)

Recently, there have been some discussions about mysterious spacing of
\rounded-box markup.

Harm identified skyline problems as the cause and submitted the following bug
report:
[Possible regression with box-markup/rounded-box-markup
](http:///lilypond.1069038.n5.nabble.com/Possible-regression-with-box-markup-rounded-box-markup-tt211212.html)
Before Mike Solomon's new skyline handling, there were no such uninteded extra
margins.

# Rounded Box Skylines
The skyline of boxes with rounded corners do not tightly wrap the boxes but
there's an unintentional margin (as wide as the corner radius).

Apart from that here are a few other shortcomings and so I have decided to
create a more general box-and-rotated-ellipses skyline issue.

#Other issues
When working on this case, I came across a few other things that call for
improvement and so I've included them into the test file. Most notably, there
is a general problem with rotation. And it would be nice to recreate the
At the same time, one should keep run-of-the-mill stuff like ledger lines as
simple and fast as possible.

# Test file
A file with 'debug-skylines switched on and TextScript padding values set to 0
in order to be able to check how the markup objects are fitted together.
I have tried to demonstrate about everything you cold do with boxes (including
scaling, rotating, cominations thereof).

~~~
#(ly:set-option 'debug-skylines #t)

{
\set Staff.instrumentName = \markup #(lilypond-version)
\override Staff.TextScript.self-alignment-X = #CENTER
\override Staff.TextScript.layer = 0
f'''4
c'' ^\markup \override #'(thickness . 4) \box \teeny 1
_\markup \with-color #grey \filled-box #'(-1 . 4) #'(1 . 4) #1
b'  ^\markup \rounded-box "2!" ^\markup \rounded-box "3"
d'' ^\markup \circle "*" ^\markup \rotate #90 \ellipse "Elli"
_\markup \with-color #grey \rotate #10 \filled-box #'(-2 . 5) #'(1 . 4)
#10
_ \markup \rotate #36 \override #'(corner-radius . 20) \scale #'(1 . 0.4)
\rotate #-68 \scale #'(1.6 . 1) \rounded-box "dop"
f'' _\markup \override #'(corner-radius . 0.5) \rounded-box "."
a'  ^\markup \rotate #30 \rounded-box "rotated a"
_\markup \scale #'(1 . 1.5) \rotate #45 \override #'(thickness . 5)
\rounded-box \rotate #-45 \scale #'(2 . 1) \bold "!"
d'' _\markup \override #'(corner-radius . 20) \rounded-box "4"
a'' ^\markup \rotate #-165 \box "rotated b"
_\markup \rotate #180 \override #'(corner-radius . 20) \rounded-box \teeny
\override #'(baseline-skip . 0) \center-column { "Upside" "Down"
}
}
~~~
(see attached PNG file)

* Ledger lines are filled rounded boxes, too (!)
* Corner radius is misinterpreted as line thickness and padded around the box.
* Ledger lines have rounded corners, but the blot diameter is so small that the
effect didn't disturb too much.
* When rotating boxes, the skylines still consist of one single non-rotated
rectangular box.
* Rounded corners are not replicated in the skylines, even if this may be
* Ellipse skylines gradually deteriorate when being rotated. In the example,
the skyline of ellipse "Elli" has completely collapsed because of the 90°
rotation.
* The rhombus "!" has been created by rotating and scaling that unfortunately
caused a collapse of the skyline.
* Rotations in general cause large skyline boxes that hamper object placement a
lot.

---

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