Function to fill a ternary plot with coloured tiles. Useful in combination with
`TernaryPointValues`

and `TernaryContour`

.

```
TernaryTiles(
x,
y,
down,
resolution,
col,
direction = getOption("ternDirection", 1L)
)
```

- x, y
Numeric vectors specifying

*x*and*y*coordinates of centres of each triangle.- down
Logical vector specifying

`TRUE`

if each triangle should point down (or right),`FALSE`

otherwise.- resolution
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.

- col
Vector specifying the colour with which to fill each triangle.

- direction
(optional) Integer specifying the direction that the current ternary plot should point: 1, up; 2, right; 3, down; 4, left.

Other functions for colouring and shading:
`ColourTernary()`

```
FunctionToContour <- function (a, b, c) {
a - c + (4 * a * b) + (27 * a * b * c)
}
TernaryPlot()
values <- TernaryPointValues(FunctionToContour, resolution = 24L)
ColourTernary(values)
TernaryContour(FunctionToContour, resolution=36L)
```