Center normal node

[whelena]

Description

Added a correction term to make sure normal node is centered when plotting.direction is left or right

Closes #176

Results

Checklist

• This PR does NOT contain Protected Health Information (PHI). A repo may need to be deleted if such data is uploaded.
  Disclosing PHI is a major problem¹ - Even a small leak can be costly².

• This PR does NOT contain germline genetic data³, RNA-Seq, DNA methylation, microbiome or other molecular data⁴.

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  To automatically exclude such files using a .gitignore file, see here for example.

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• The name of the branch is meaningful and well formatted following the standards, using [AD_username (or 5 letters of AD if AD is too long)]-[brief_description_of_branch].

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Footnotes

1. UCLA Health reaches $7.5m settlement over 2015 breach of 4.5m patient records ↩

2. The average healthcare data breach costs $2.2 million, despite the majority of breaches releasing fewer than 500 records. ↩

3. Genetic information is considered PHI.
   Forensic assays can identify patients with as few as 21 SNPs ↩

4. RNA-Seq, DNA methylation, microbiome, or other molecular data can be used to predict genotypes (PHI) and reveal a patient's identity. ↩

[dan-knight]

Positioning looks good. I wonder if we should also rotate it? This is more of a scientific question than a software one. My thinking is to rotate the box, and the "N" as close to upright as possible? Or only rotate the box?

[whelena]

I think it makes the most sense for the "N" to remain upright, so its consistent with the orientation of the other node labels. As for the box, I'm not entirely sure—it could stay upright as well. Having an upright "N" inside a slightly rotated box (when plotting.direction = pi/8) might look disturbing.

These look ok I think, with the N + box upright