Scatter overlap check (WCAG Success Criterion 1.3.1)

Bins point coordinates from geom_point layers to a bins x bins grid in data space and reports the fraction of points that share a cell with another point. Treat as a render-resolution proxy for Success Criterion 1.3.1 (information must remain perceivable). When overlap is non-zero, alpha may be considered, but composited contrast must clear 3:1 per Success Criterion 1.4.11.

Usage

a11y_check_overlap(p, bins = 100)

Arguments

p

A ggplot object with at least one geom_point layer.

bins

Grid resolution per axis (default 100).

Value

List with total, obscured, fraction, recommendation.