Calculate x and y coordinates of the midpoints of triangles tiled to cover a ternary plot.
TriangleCentres(resolution = 48L, direction = getOption("ternDirection", 1L))
The number of triangles whose base should lie on the longest axis of the triangle. Higher numbers will result in smaller subdivisions and smoother colour gradients, but at a computational cost.
(optional) Integer specifying the direction that the current ternary plot should point: 1, up; 2, right; 3, down; 4, left.
TriangleCentres()
returns a matrix with three named rows:
x
x coordinates of triangle midpoints;
y
y coordinates of triangle midpoints;
triDown
0
for upwards-pointing triangles, 1
for downwards-pointing.
Add triangles to a plot: TernaryTiles()
Other coordinate translation functions:
ReflectedEquivalents()
,
TernaryCoords()
,
XYToTernary()
Other tiling functions:
Polygon-Geometry
,
TriangleInHull()
TernaryPlot(grid.lines = 4)
centres <- TriangleCentres(4)
text(centres["x", ], centres["y", ], ifelse(centres["triDown", ], "v", "^"))