v2.3.1

Improve support for region parameter.

v2.3.0

• region parameter plots a sub-region of the ternary space.
• Support ... in TernaryContour(Func = function(...)) (#81).

v2.2.1

• Polygon-Geometry now imported from 'PlotTools'. Aliases of these functions are provided but will be removed in a later version of this package.
• Use characters, not numerics, for version number checks (see https://bugs.r-project.org/show_bug.cgi?id=18548).

v2.2.0

• New function Annotate() annotates points on ternary plot.
• New option filled to produce filled contour lines in TernaryContour() (#69).
• Improve clarity of point size plotting example.
• Native colour bar support in ColourTernary() (#66).
• Require R 3.5 (due to dependency on "rlang").

v2.1.3

• New vignette with annotation example (#64).

v2.1.2

• Support independent labelling of axes.

v2.1.1

• Fix regression that caused col parameter to be ignored.
• Fix failure to plot grid when grid.lines is integer.
• Mention srt graphical parameter in TernaryText() documentation.

v2.1.0

• Colour sub-region of ternary plot with ColourTernary():
  • Add Polygon-Geometry functions for polygon manipulation.
  • Support NA values in ColourTernary().
• Tidy code formatting and catch typos.

v2.0.0

• Create Holdridge plots using HoldridgePlot() and related functions
  (#48).
• Add panel.first and panel.last parameters to TernaryPlot()
  (fixing #54).
• Support graphical parameters (e.g. xpd) in TernaryPlot().
• Add introductory vignette for new R users.
• Help diagnose non-installation of app.

v1.2.4

• Default to upward direction if TernaryPlot() not yet called.
• Improved input checking in TernaryPointValues() and TernaryContour(),
  (#53), and avoid unnecessary calculations.