Visual primitive

Gridlines `has_gridlines`

Reference lines across the plot area.

Light gridlines aid reading without dominating. Heavy or dense gridlines become chartjunk. The best practice is light major gridlines (every $50M, every 10%), no minor gridlines.

When critical

Dense data where the eye needs reference lines to read precise values (line charts with 30+ points, bar charts without data labels).

When optional

Sparse charts where data labels cover the precision need. Sparklines and small charts where gridlines crowd.

Failures when missing

reader has to estimate values without reference points

Failures when present (badly)

heavy gridlines (chartjunk) — the lines compete with the data
minor gridlines too dense (visual noise)

Critical for families

time-series
correlation
distribution

Aspose property bindings

MajorGridlines.visibility
MinorGridlines.visibility
CategoryAxis.tickMarks