Plot kanjivec objects

Usage

# S3 method for kanjivec
plot(
  x,
  type = c("kanji", "dend"),
  seg_depth = 0,
  palette = "Dark 3",
  pal.extra = 0,
  numbers = FALSE,
  offset = c(0.025, 0),
  family = NULL,
  lwd = 8,
  ...
)

Arguments

x: an object of class kanjivec
type: either "kanji" or "dend". Whether to plot the actual kanji, coloring strokes according to levels of segmentation, or to plot a representation of the tree structure underlying this segmentation. Among the following named parameters, only family is for use with type = "dend"; all others are for type = "dend".
seg_depth: an integer. How many steps down the segmentation hierarchy we use different colors for different groups. If zero (the default), only one color is used that can be specified with col passed via ... as usual
palette: a valid name of a hcl palette (one of hcl.pals()). Used for coloring the components if seg_depth is $>0$.
pal.extra: an integer. How many extra colors are picked in the specified palette. If this is 0 (the default), palette is used with as many colors as we have components. Since many hcl palettes run from dark to light colors, the last (few) components may be too light. Increasing pal.extra then makes the component colors somewhat more similar, but the last component darker.
numbers: logical. Shall the stroke numbers be displayed.
offset: the (x,y)-offset for the numbers relative to the positions from kanjivg saved in the kanjivec object. Either a vector of length 2 specifying some fixed offset for all numbers or a matrix of dimension kanjivec$nstrokes times 2.
family: the font-family for labeling the nodes if type = dend. See details.
lwd: the usual line width graphics parameter.
...: further parameters passed to lines if type = "kanji" and to plot.dendrogram if type = "dend".

Value

No return value, called for side effects.

Details

Setting up nice labels for the nodes if type = "dend" is not easy. For many font families it appears that some "kanji components" cannot be displayed in plots even with the help of package showtext and if the font contains glyphs for the corresponding codepoints that display correctly in text documents. This concerns in increasing severity of the problem Unicode blocks 2F00–2FDF (Kangxi Radicals), 2E80–2EFF (CJK Radicals Supplement) and 31C0–31EF (CJK Strokes). For the strokes it seems nearly impossible which is why leaves are simply annotated with the number of the strokes.

For the other it is up to the user to find a suitable font and pass it via the argument font family. The default family = NULL first tries to use default_font if this option has been set (via kanjistat_options) and otherwise uses wqy-microhei, the Chinese default font that comes with package showtext and cannot display any radicals from the supplement.

On a Mac the experience is that "hiragino_sans" works well. In addition there is the issue of font size which is currently not judiciously set and may be too large for some (especially on-screen) devices. The parameter cex (via ...) fixes this.

Examples

kanji <- fivebetas[[2]]
plot(kanji, type = "kanji", seg_depth = 2)

plot(kanji, type = "dend")  

  # gives a warning if get_kanjistat_option("default_font") is NULL