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Changelog

Source: NEWS.md

ggCheysson 1.1.0

CRAN release: 2026-10-01

Breaking changes

  • Fixed a palette-naming collision bug. Palette names were built from Album + Qty (e.g. "1880_07"), but Qty is not a unique plate identifier - it’s a colors/pattern-element count that happened to repeat across genuinely different plates. 4 such collisions silently overwrote 5 of the original 25 palettes during data extraction. Names are now built from the real, unique plate identifier (RumseyListNo’s decimal suffix) instead: 19 of the 20 previously-shipped palettes have a new name, and all 5 previously-missing palettes are now included - cheysson_palettes/cheysson_patterns now have 25 palettes (was 20), with 134 pattern specifications (was 83). See the new cheysson_labels dataset (below) to map an old name to its new one.

  • Migration aids for the rename: an old (1.0.1) palette name that no longer exists now errors with the palette’s new name, e.g. "1883_06" -> "1883_30", instead of just “not found”. Watch out for "1880_07": it is still a valid name, but now refers to a different palette (grouped, 1880 plate 7). The palette called "1880_07" in 1.0.1 is now "1880_21". Using "1880_07" gives a once-per-session message saying so. ("1906_06" is the only old name that still means the same palette.)

  • Palette order is now consistent: sequential palettes are stored from low to high (light to dark) and diverging palettes end to end, so reverse = TRUE means the same for every palette. Previously palettes kept RJ Andrews’ swatch order, so 1891_19, 1891_25 and 1900_28 ran dark to light, and 1883_31 put its hatched patterns at the extremes; these are now reordered. Category and grouped palettes are unchanged.

  • When a sequential or diverging palette has more elements than needed, cheysson_pal(n = ), cheysson_pattern(n = ) and all the scale_*_cheysson() scales now pick elements spread over the whole palette, keeping both ends, instead of the first n - which could drop one end of a diverging palette entirely (e.g. 1883_21 with 5 classes).

New features

  • New (experimental) scale_cheysson() applies a whole color-and-pattern palette - fill, hatch type, line colors and angle - with one +, in place of four or five separate scale_*_cheysson() calls; aes_cheysson(x) maps a variable to all of those aesthetics. See the new vignette “Combining Colors and Patterns”. The individual scales remain.

  • Two-color crosshatches: the crosshatches in 1883_30 and 1886_17 draw their two sets of lines in different colors (red and blue; orange and blue-grey). These are now stored as pattern_fill2, returned by cheysson_pattern_params(param = "pattern_fill2"), and applied by the new scale_pattern_fill2_cheysson(); map ggpattern’s pattern_fill2 aesthetic to use them.

  • Added cheysson_labels, a new dataset mapping every palette’s current name to its previous (pre-fix) name, RJ Andrews’ original Advent-calendar label, Tom Shanley’s Observable notebook ID, and the underlying David Rumsey catalog number - useful for looking up a palette by whichever naming scheme you encountered it in.

  • Added cheysson_name(), a lookup function that translates a palette label from any of the cheysson_labels naming schemes (Andrews’ label, Shanley’s ID, a Rumsey catalog number, the old pre-fix name, or an advent day) into the current palette name, for direct use in calls like scale_color_cheysson(cheysson_name("Dec.01-1883.21")). When a label is ambiguous (only possible via the old naming scheme, which had 4 real collisions), it warns and lists every match; pass advent_day to disambiguate without a warning, or to assert a specific palette.

Bug fixes

  • Vignettes now render figures with ragg. This fixes a segfault on CRAN’s Intel macOS check machines, where the Quartz png() device crashes drawing ggpattern’s masks. Also, set fig.showtext = TRUE, so showtext text is drawn at the device’s real dpi and figures look the same in the package vignettes and on the pkgdown site.

  • Missing values in a mapped pattern aesthetic no longer make ggpattern fail: the pattern scales now give missing data no hatching (pattern = "none") by default.

  • The 1883 category palette of Advent day 22 is named 1883_30: the source data’s Rumsey number for it (12512.013) was a typo for 12514.030, the 1883 album’s plate 30, as checked against the original plate. cheysson_labels keeps RJ Andrews’ and Tom Shanley’s labels for it (Dec.22-1881.13, category12512013), which were built from the bad number.

  • Fixed 15 missing pattern elements across 6 palettes (1882_04, 1883_07, 1886_04, 1886_07, 1887_06, 1900_06, in their old names): an SVG-parsing bug silently dropped hatch-line patterns whose coordinates relied on SVG’s implicit default of 0 for an omitted x1/y1/x2/y2 attribute.

  • Fixed two scale_pattern_*_cheysson() bugs: scale_pattern_type_cheysson() targeted the wrong ggpattern aesthetic (pattern_type instead of pattern) and so never actually varied the rendered pattern shape by category; scale_pattern_fill_cheysson() read the wrong parameter (fill instead of pattern_fill) and always returned "transparent" regardless of palette.

  • Fixed theme_cheysson()’s/theme_cheysson_map()’s plot.title (set in CheyssonTitle) rendering smaller than intended, the same underlying issue as the 1.0.1 axis/legend-title fix below but previously missed for the plot title itself. The correction is now generalized (cheysson_font_size_adjust()) to all four Cheysson display fonts instead of hardcoded to one.

Other changes

  • The help topic for scale_color_cheysson()/scale_fill_cheysson() is now ?scale_color_cheysson (the name scale_cheysson belongs to the new function).

  • Added real (rendered) pattern examples to the README’s Pattern Support section, which previously had none.

  • theme_cheysson_map() text sizing redesigned: plot.title, plot.subtitle, legend.title, and legend.text now scale from base_size using a deliberate poster-style hierarchy (a much larger title relative to the rest, in the spirit of Guerry’s own maps) instead of the modest ratios theme_cheysson() uses; plot.caption is now styled too (previously unstyled and tiny). base_size alone now controls this - no need for the theme(plot.title = element_text(size = ...)) overrides the guerry-maps vignette previously needed on every map. Sizes are calibrated at true scale (a ~40-character title just fits an 8in-wide figure), and titles are now centered on the whole plot rather than the panel, so a side legend no longer pushes a long title off the left edge.

ggCheysson 1.0.1

CRAN release: 2026-09-26

  • Fixed undersized axis and legend titles in theme_cheysson() (inherited by theme_cheysson_minimal()): CheyssonSansCaps renders visibly smaller than other package fonts at the same nominal size, so title text is now scaled up to match

  • Bumped roxygen2 to 8.1.0 (Config/roxygen2/version)

  • Removed unnecessary \dontrun{}/\donttest{} wrapping from examples that run cleanly (show_palette(), show_palettes(), the scale_*_cheysson() family); kept \donttest{} only where custom-font grid text rendering can crash on some devices

  • Added R-universe badge and installation instructions to README

  • Hardened cheysson_fonts_available(), cheysson_pal(), and cheysson_pattern() against non-length-1 arguments (method, n) that could otherwise trigger opaque errors

ggCheysson 1.0.0

  • Initial version, implementing Cheysson color palettes, patterns and fonts
  • Fixed problem with fonts, requiring showtext::showtext_auto()
  • Added Getting started vignette
  • Added Guerry maps vignette
  • Added show_palette() functions
  • Fixed problems from the initial CRAN submission:
    • @return tags for all functions
    • list_cheysson_fonts() function converted to cheysson_fonts data object
    • \dontrun{} examples unwrapped, or changed to \donttest{} if they depend on system features