Grid index to x,y coordinate and vice-versa

DataVolley uses a grid to represent positions on court (values in columns "start_coordinate", "mid_coordinate", and "end_coordinate" in the play-by-play data frame). These functions convert grid index values to x, y coordinates suitable for plotting, and vice-versa. For a description of the court dimensons and coordinates see ggcourt.

Usage

dv_index2xy(index)

dv_xy2index(x, y)

Arguments

index

integer: vector of grid indices. If missing, the entire grid will be returned. The row numbers match the grid indices

x

numeric: x-coordinate. For dv_index2xy this can be a two-column matrix or data.frame containing x and y

y

numeric: y-coordinate

Value

for dv_index2xy, a data.frame with columns "x" and "y"; for dv_xy2index a vector of integer values

See also

ggcourt, dv_xy, dv_flip_xy, dv_xy2zone, dv_xy2subzone

Examples

## positions (zones) 1 and 3 are at x, y coordinates c(3, 1) and c(2, 3) respectively

## their grid indices:
dv_xy2index(c(3, 2), c(1, 3))
#> [1] 1677 4351