Sketchy callouts (boxed labels with a leader arrow)

Draws a handwriting label inside a roughened rounded box, optionally with a hand-drawn leader arrow pointing from the box to a target (xend, yend). The box auto-sizes to the label, and the leader leaves from the box edge nearest the target. The sketch take on a speech-bubble / callout annotation.

Usage

GeomSketchCallout

geom_sketch_callout(
  mapping = NULL,
  data = NULL,
  stat = "identity",
  position = "identity",
  ...,
  roughness = 1,
  bowing = 0.6,
  n_passes = 2L,
  seed = NULL,
  padding = 0.06,
  corner_radius = 0.3,
  arrow_length = NULL,
  arrow_angle = 25,
  arrow_head = NULL,
  leader = "straight",
  curvature = 0.3,
  family = NULL,
  na.rm = FALSE,
  show.legend = FALSE,
  inherit.aes = TRUE
)

Arguments

mapping: Aesthetic mappings created by ggplot2::aes(). Requires x, y, and label; map xend/yend to add a leader arrow to a target.
data: Data with one row per callout.
stat: Statistical transformation. Default "identity".
position: Position adjustment. Default "identity".
...: Other arguments passed on to the layer.
roughness: Non-negative roughness (0 = clean). Default 1.
bowing: Non-negative bowing multiplier. Default 0.6.
n_passes: Number of stroke passes. Default 2.
seed: Integer seed. NULL uses getOption("ggsketch.seed", 1L).
padding: Box padding around the label, in inches. Default 0.06.
corner_radius: Box corner rounding (fraction of half-side). Default 0.3.
arrow_length: Leader arrowhead length in inches. NULL (default) adapts it to the leader length.
arrow_angle: Half-angle of the leader arrowhead in degrees. Default 25.
arrow_head: Leader head style, one of sketch_arrowheads(). NULL (default) draws the open V.
leader: Leader routing: "straight" (default), "elbow" (horizontal then vertical, flowchart style) or "curved" (a bowed Bezier).
curvature: Bow size when leader = "curved". Default 0.3.
family: Font family for the label. Defaults to the same family as theme_sketch() (getOption("ggsketch.base_family", ""), i.e. the device default), so the label matches the plot's other text; set options(ggsketch.base_family = "auto") for a handwriting face, or pass an explicit family here.
na.rm: Remove missing values silently? Default FALSE.
show.legend: Logical; include in legend? Default FALSE.
inherit.aes: Inherit aesthetics from the plot? Default TRUE.

Value

A ggplot2 layer object.

Details

For one-off annotations, annotate_sketch_callout() is the easiest entry point.

Other sketch-geoms: GeomSketchAbline, GeomSketchArrow, GeomSketchBoxplot, GeomSketchBracket, GeomSketchChicklet, GeomSketchCol, GeomSketchContourFilled, GeomSketchCurve, GeomSketchDotplot, GeomSketchDumbbell, GeomSketchEdge, GeomSketchEllipse, GeomSketchEngrave, GeomSketchGantt, GeomSketchHex, GeomSketchLine, GeomSketchLinerange, GeomSketchLollipop, GeomSketchMarkCircle, GeomSketchMarkHull, GeomSketchPath, GeomSketchPoint, GeomSketchPolygon, GeomSketchRect, GeomSketchRibbon, GeomSketchRug, GeomSketchSegment, GeomSketchSfPolygon, GeomSketchSlope, GeomSketchSmooth, GeomSketchSpoke, GeomSketchTextRepel, GeomSketchViolin, StatSketchBeeswarm, StatSketchCalendar, StatSketchDensityRidges, StatSketchFunnel, StatSketchPie, StatSketchPyramid, StatSketchRadar, StatSketchStream, StatSketchTreemap, StatSketchWaffle, StatSketchWaterfall, annotate_sketch(), annotate_sketch_arrow(), annotate_sketch_callout(), annotate_sketch_highlight(), geom_sketch_alluvial(), geom_sketch_arc_diagram(), geom_sketch_bin2d(), geom_sketch_bump(), geom_sketch_chord(), geom_sketch_contour(), geom_sketch_count(), geom_sketch_dendrogram(), geom_sketch_density(), geom_sketch_density2d(), geom_sketch_ecdf(), geom_sketch_function(), geom_sketch_histogram(), geom_sketch_jitter(), geom_sketch_marimekko(), geom_sketch_mosaic(), geom_sketch_parallel(), geom_sketch_qq(), geom_sketch_quantile(), geom_sketch_rose(), geom_sketch_sunburst(), geom_sketch_text(), sketch_graph()

Examples

library(ggplot2)
ggplot(mtcars, aes(wt, mpg)) +
  geom_sketch_point(seed = 1L) +
  annotate_sketch_callout(x = 4, y = 32, label = "outlier?",
                          xend = 5.25, yend = 18, seed = 2L) +
  theme_sketch()