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Tableau Shape Palettes (discrete)

Source: R/tableau.R
tableau_shape_pal.Rd

Shape palettes used by Tableau.

Usage

tableau_shape_pal(
  palette = c("default", "filled", "proportions"),
  unicode = FALSE
)

Arguments

palette

Palette name.

unicode

If TRUE, return pch codes derived from Unicode glyphs, as this palette did before ggthemes 6.1.0. Glyph shapes are drawn by the device font, so they render as blank boxes in a font without coverage; the default returns base pch codes, which every font can draw.

Details

Not all shape palettes in Tableau are supported, and these palettes are not exact.

Shape palettes in Tableau are used to expose images for use as markers in charts, and thus are sometimes groupings of closely related symbols.

Note

Supported values by palette: "default" eight (ten with unicode = TRUE), "filled" six (ten), "proportions" two (five). Shapes with no base pch equivalent – the sideways triangles, the solid star, and the partially filled circles – are dropped rather than approximated by a different shape.

"proportions" encodes fill fraction, which base pch cannot express at all, so only its empty and full circles survive; they remain meaningful as a two-value scale. To encode a proportion, map alpha or fill instead, or use unicode = TRUE with a font covering Geometric Shapes, such as DejaVu Sans.

See also

Other shapes tableau: scale_shape_tableau()

Examples

# The eight shapes with a font-independent equivalent.
show_shapes(tableau_shape_pal()(8))


if (FALSE) { # \dontrun{
  # All ten, drawn from the device font. Needs a font covering Geometric
  # Shapes, such as DejaVu Sans.
  show_shapes(tableau_shape_pal(unicode = TRUE)(10))
} # }