Returns the indexes of supplied points, x and y, ordered either clockwise or
anticlockwise about another point, which by default is taken to be the non-weighted midpoint
of the supplied data
Usage
orderPoints(x, y, ..., xm = mean(range(x)), ym = mean(range(y)),
clockwise = TRUE)
Arguments
x
numeric vector of x values
y
numeric vector of y values of same length as x
...
not used
xm
the x value of the reference point
ym
the y value of the reference point
clockwise
order in clockwise or anticlockwise manner
Examples
#Generate a random set of points and put them clockwise order
set.seed(1)
x = runif(100)
y = runif(100)
op = orderPoints(x,y)
#To demonstrate, Lets view the points in order
library(ggplot2)
df = data.frame(x,y)
df = df[op,];
df$id = 1:nrow(df)
ggplot(data=df,aes(x,y,colour=id)) +
geom_path() + geom_point() +
scale_colour_gradient(low="green",high="red")