draw_penguin() now sizes the glyph in inches (new argument size, replacing base_size) rather than in the units of the axes. A glyph has the same shape and size in any plot, whatever the aspect ratio or the ranges of the axes, so asp = 1 is no longer needed.
New penguin_points() adds glyphs for the rows of a data frame to an existing plot, in the manner of points().
New penguin_legend() adds a species legend, and penguin_colors() gives the default species colors. Colors can be changed with the new col argument of the plotting functions.
The legend in penguin_glyphs() now matches colors to species by name. Previously, colors were assigned in the order the species appeared in the data, so the legend could disagree with the glyphs.
Measurements are now scaled relative to their ranges in the full datasets::penguins data, rather than in the rows being plotted, so a given penguin looks the same in any subset. The new ref argument of penguin_glyphs() and penguin_points() controls this; ref = data gives the old behavior.
Missing values are now visible: a missing measurement is drawn as an unfilled, dashed outline of that part of the glyph, and a penguin of unknown sex has pupils but no eye outlines (it was drawn as a male).
The legend in penguin_glyphs() no longer overlaps the glyphs. It is placed outside the grid, beside or above/below it, using the spare room around the grid where there is some.
normalize_var() gains a from argument giving the range to scale from, and returns NA rather than 1 for a variable that is entirely missing.
Data
New dataset crime, the rates of serious crimes in the US states that Nathan Yau used to illustrate Chernoff faces. The “How to Draw a Penguin” vignette now uses it, rather than downloading the file.
Glyph design
Body area, rather than body width and height, is now proportional to body mass, so the body no longer dominates.
The head is the same size in all glyphs, as a frame of reference for the bill and eyes.
The bill starts at the side of the head, clear of the eyes.
Flippers are angled downward, so those of neighboring glyphs no longer collide.
Pupils are drawn as part of the glyph and scale with it.
penguinglyphs 0.1.0
Initial release
Added draw_penguin() function for drawing individual penguin glyphs
