openintro (version 2.4.0)

fadeColor: Fade colors

Description

Fade colors so they are transparent.

Usage

fadeColor(col, fade = "FF")

Arguments

col

An integer, color name, or RGB hexadecimal.

fade

The amount to fade col. This value should be a character in hexadecimal from '00' to 'FF'. The smaller the value, the greater the fading.

Author

David Diez

Examples

data(mariokart)
new <- mariokart$cond == "new"
used <- mariokart$cond == "used"

# ===> color numbers <===#
dotPlot(mariokart$total_pr[new],
  ylim = c(0, 3), xlim = c(25, 80), pch = 20,
  col = 2, cex = 2, main = "using regular colors"
)
dotPlot(mariokart$total_pr[used], at = 2, add = TRUE, col = 4, pch = 20, cex = 2)
dotPlot(mariokart$total_pr[new],
  ylim = c(0, 3), xlim = c(25, 80),
  col = fadeColor(2, "22"), pch = 20, cex = 2,
  main = "fading the colors first"
)
dotPlot(mariokart$total_pr[used],
  at = 2, add = TRUE,
  col = fadeColor(4, "22"), pch = 20, cex = 2
)

# ===> color names <===#
dotPlot(mariokart$total_pr[new],
  ylim = c(0, 3), xlim = c(25, 80), pch = 20,
  col = "red", cex = 2, main = "using regular colors"
)
dotPlot(mariokart$total_pr[used], at = 2, add = TRUE, col = "blue", pch = 20, cex = 2)
dotPlot(mariokart$total_pr[new],
  ylim = c(0, 3), xlim = c(25, 80),
  col = fadeColor("red", "22"), pch = 20, cex = 2,
  main = "fading the colors first"
)
dotPlot(mariokart$total_pr[used],
  at = 2, add = TRUE,
  col = fadeColor("blue", "22"), pch = 20, cex = 2
)

# ===> hexadecimal <===#
dotPlot(mariokart$total_pr[new],
  ylim = c(0, 3), xlim = c(25, 80), pch = 20,
  col = "#FF0000", cex = 2, main = "using regular colors"
)
dotPlot(mariokart$total_pr[used],
  at = 2, add = TRUE, col = "#0000FF", pch = 20,
  cex = 2
)
dotPlot(mariokart$total_pr[new],
  ylim = c(0, 3), xlim = c(25, 80),
  col = fadeColor("#FF0000", "22"), pch = 20, cex = 2,
  main = "fading the colors first"
)
dotPlot(mariokart$total_pr[used],
  at = 2, add = TRUE,
  col = fadeColor("#0000FF", "22"), pch = 20, cex = 2
)

# ===> alternative: rgb function <===#
dotPlot(mariokart$total_pr[new],
  ylim = c(0, 3), xlim = c(25, 80), pch = 20,
  col = rgb(1, 0, 0), cex = 2, main = "using regular colors"
)
dotPlot(mariokart$total_pr[used],
  at = 2, add = TRUE, col = rgb(0, 0, 1),
  pch = 20, cex = 2
)
dotPlot(mariokart$total_pr[new],
  ylim = c(0, 3), xlim = c(25, 80),
  col = rgb(1, 0, 0, 1 / 8), pch = 20, cex = 2,
  main = "fading the colors first"
)
dotPlot(mariokart$total_pr[used],
  at = 2, add = TRUE,
  col = rgb(0, 0, 1, 1 / 8), pch = 20, cex = 2
)