Create a color generating function from a vector of colors
makeColorscheme(col)
a vector of colors
a function that generates a vector of colors interpolated among the colors in col
cs <- makeColorscheme( c('red','white','blue') )
cs(10)
#> [1] "#FF0000FF" "#FF0000FF" "#FF0000FF" "#FFFFFFFF" "#FFFFFFFF" "#FFFFFFFF"
#> [7] "#0000FFFF" "#0000FFFF" "#0000FFFF" "#0000FFFF"
cs(10, alpha=.5)
#> [1] "#FF000080" "#FF000080" "#FF000080" "#FFFFFF80" "#FFFFFF80" "#FFFFFF80"
#> [7] "#0000FF80" "#0000FF80" "#0000FF80" "#0000FF80"