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Convert a Newick tree to SVG format for visualization.

Input:

  • A Newick tree file.
  • If the file contains multiple trees, only the first tree is processed.

Notes:

  • Automatically draws a phylogram if branch lengths are present; otherwise draws a cladogram.
  • Underscores (_) in names are replaced with spaces.
  • Default styles match the LaTeX Forest template: grey branch lines (1 pt), black node dots (2.5 px), sans-serif font.
  • Node visual annotations stored in NHX comments are rendered: color (text color), label (extra label), dot, bar, rec (subtree background), tri (triangle), and comment (leaf note). comment, T, S, rank, and member are joined into a single leaf comment.
  • Underscores (_) in annotation values are replaced with spaces, matching to-tex behavior.
  • A scale bar is drawn in phylogram mode, using a 1×/2×/5× dynamic tick algorithm.
  • --width / -w: SVG canvas width in pixels (default: 750). Must be a positive finite number.
  • --vskip / -v: vertical spacing between leaf nodes in pixels (default: 30). Must be a positive finite number.

Examples:

  1. Convert to SVG necom nwk to-svg tree.nwk -o tree.svg

  2. Custom width and spacing necom nwk to-svg tree.nwk -w 1200 -v 30 -o tree.svg