Description

Closes #159. There's an aesthetic issue with node spacing in the example with more than three siblings, but I don't think this is a bug per-se (and probably not the same bug that this change fixes). Let me know if this behaviour makes sense for now. If so, we can merge this fix before addressing polygon angles more generally.

Examples

Three Siblings

phy.dt <- data.frame(
    parent = c(NA, 1, 1, 2, 1),
    label = c(1:5),
    CP = c(1.2, 0.5, 0.4, 0.2, 0.3)
    );
grid.draw(SRCGrob(phy.dt));

Four Siblings

phy.dt <- data.frame(
    parent = c(NA, 1, 1, 1, 2, 1),
    label = c(1:6),
    CP = c(1.2, 0.5, 0.4, 0.2, 0.3, 0.15)
    );
grid.draw(SRCGrob(phy.dt));

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].

• I have added the major changes included in this pull request to the CHANGELOG.md under the next release version or unreleased, and updated the date.