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1
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1 viridis <- function (n, alpha = 1, begin = 0, end = 1, direction = 1, option = "D")
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2 {
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3 if (begin < 0 | begin > 1 | end < 0 | end > 1) {
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4 stop("begin and end must be in [0,1]")
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5 }
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6 if (abs(direction) != 1) {
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7 stop("direction must be 1 or -1")
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8 }
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9 if (direction == -1) {
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10 tmp <- begin
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11 begin <- end
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12 end <- tmp
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13 }
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14 option <- switch(EXPR = option, A = "A", magma = "A",
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15 B = "B", inferno = "B", C = "C", plasma = "C",
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16 D = "D", viridis = "D", E = "E", cividis = "E",
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17 {
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18 warning(paste0("Option '", option, "' does not exist. Defaulting to 'viridis'."))
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19 "D"
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20 })
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21 map <- viridisLite::viridis.map[viridisLite::viridis.map$opt ==
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22 option, ]
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23 map_cols <- grDevices::rgb(map$R, map$G, map$B)
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24 fn_cols <- grDevices::colorRamp(map_cols, space = "Lab",
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25 interpolate = "spline")
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26 cols <- fn_cols(seq(begin, end, length.out = n))/255
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27 grDevices::rgb(cols[, 1], cols[, 2], cols[, 3], alpha = alpha)
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28 } |
