marks: Visual Marks

In glyph: A Grammar of Interactive Graphics

Visual Marks

Description

Marks are the layers that draw data: points, lines, bars, areas, text, rules, ribbons, links and polygons. Each ⁠mark_*()⁠ call adds one layer to the spec. mark_boxplot(), mark_violin(), mark_sina() and mark_histogram() summarise the distribution of a variable; their statistics are computed from the data when the plot is compiled.

Mappings are passed as bare column names or expressions, and are added to the global mappings set in glyph(). A mark can also take its own data, so one plot can draw from several data frames. Fixed visual properties that don't depend on the data, such as size, opacity or stroke_width, go in style. Interaction and animation are set for the whole plot with interact() and animate().

glyph documentation built on Oct. 21, 2026, 5:12 p.m.