SwatchLegend

SwatchLegend[{col1, ...}, {lbl1, ...}] generates a legend that associates swatches of colors coli with labels lbli.

• SwatchLegend[{col1, ...}, Automatic] generates a legend with placeholder labels for the colors coli.
• SwatchLegend[{lbl1, ...}] represents a legend with inherited colors within visualization functions.

Styling options

SwatchLegend supports LegendFunction, LegendLayout, LegendMargins, LabelStyle, RoundingRadius, and Background.

• LegendFunction accepts the named functions "Panel", "Frame", "Framed", "DarkFrame", and "Frameless". Arbitrary functions are not currently supported.
• LegendLayout accepts "Row", "Column", "ReversedRow", and "ReversedColumn".
• LegendMargins accepts either one margin for every side or {{left, right}, {top, bottom}}.
• LabelStyle supports colors, FontFamily, and FontSize.
• RoundingRadius sets the corner radius of the legend container.
• Background sets the container background.

These options are also supported by LineLegend and PointLegend.

Examples

Create a color swatch legend:

SwatchLegend[{Red, Green, Blue}, {"Low", "Medium", "High"}]

Use with a plot:

BarChart[{1, 2, 3}, ChartLegends -> SwatchLegend[{"A", "B", "C"}]]

Combine layout and container styles:

Plot[{x, 2x}, {x, 0, 1},
 PlotLegends -> Placed[
  SwatchLegend[Automatic, {"x", "2x"},
   LegendFunction -> "DarkFrame",
   LegendLayout -> "Row",
   LegendMargins -> {{5, 9}, {5, 5}},
   LabelStyle -> Directive[FontSize -> 12],
   RoundingRadius -> 0,
   Background -> White
  ],
  {0.45, 0.5}
 ]
]

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