export function isDarkColor()

in src/lib/shared/colors/index.js [2:31]

• 21 lines of code
• 4 McCabe index (conditional complexity)

export function isDarkColor(color) {
  let r, g, b
  // Check the format of the color, HEX or RGB?
  if (color.match(/^rgb/)) {
    // If HEX --> store the red, green, blue values in separate variables
    color = color.match(
      /^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+(?:\.\d+)?))?\)$/,
    )

    r = color[1]
    g = color[2]
    b = color[3]
  } else {
    // If RGB --> Convert it to HEX: http://gist.github.com/983661
    color = +`0x${color.slice(1).replace(color.length < 5 && /./g, "$&$&")}`

    r = color >> 16
    g = (color >> 8) & 255
    b = color & 255
  }

  // HSP equation from http://alienryderflex.com/hsp.html
  const hsp = Math.sqrt(0.299 * (r * r) + 0.587 * (g * g) + 0.114 * (b * b))

  // Using the HSP value, determine whether the color is light or dark
  if (hsp > 140) {
    return false
  }
  return true
}