[LeeO86]

What

A new live setting, SCOPES_GRATICULE_WIDTH, for the thickness of the graticule lines. It takes 1 to 4 output pixels. The default is 1, which is the same picture as today.

Which lines the scopes draw

Only the graticule lines (makeRenderPlan in src/scope/render.cpp): the solid, thin and dotted scale lines in each panel of every mode. Each one is a single plot row today. The traces are not lines. They are counts per histogram cell (point density), so they stay as they are. Stage 1 has no vectorscope target, no audio lines and no overlay lines. The texts and labels have their own size, which follows the output height.

Why pixels, 1–4

Today a line is 1 px at every output size. So "times the default" and "pixels" mean the same thing, and a whole number of pixels stays sharp, with no half-covered rows. 4 px is already heavy at 1080. A wider line covers rows around its row: 2 means the row and the one below, 3 means one row above and one below. Lines are cut at the plot edge. Where wide lines overlap, each pixel is drawn once and the brighter line wins.

A size that grows with the output height (like the text scale) was the other option. I did not choose it: it would change the default picture at UHD, and a fixed pixel count is easier to understand.

Where it is set

• Env var or config file.
• PATCH /api/v1/scope with the field graticule_width, shown in GET /api/v1/scope.
• A slider in the Scope tab, and a description in the Settings tab.
• Live: the state picture is drawn again when it changes.

Tests

• Unit tests: 89/89 pass. The golden hashes of every mode are unchanged, so the default picture is pixel-equal to before.
• New test graticule width, for luma, the YCbCr parade and the RGB overlay:
  • Width 1 gives exactly the same graticule pixels as the default.
  • Widths 2–4 light exactly width rows at the 0 % line in the empty plot.
  • Every pixel stays inside the plot, with one entry per pixel.
• Config tests: default 1, and 0 and 5 are refused.
• API test: PATCH 3 applies, PATCH 5 gives 400.
• npm run build of the web UI passes.

Docs

README and SPECIFICATION (§4.5 and the settings table), CHANGELOG under Unreleased.

🤖 Generated with Claude Code

https://claude.ai/code/session_017ybuzgBaGxuB5UiaE8dRa4