PdfColor.fromHex constructor

PdfColor.fromHex(String color)

Can parse colors in the form:

• #RRGGBBAA
• #RRGGBB
• #RGB
• RRGGBBAA
• RRGGBB
• RGB

Implementation

factory PdfColor.fromHex(String color) {
  if (color.startsWith('#')) {
    color = color.substring(1);
  }

  double red;
  double green;
  double blue;
  var alpha = 1.0;

  if (color.length == 3) {
    red = int.parse(color.substring(0, 1) * 2, radix: 16) / 255;
    green = int.parse(color.substring(1, 2) * 2, radix: 16) / 255;
    blue = int.parse(color.substring(2, 3) * 2, radix: 16) / 255;
    return PdfColor(red, green, blue, alpha);
  }

  assert(color.length == 3 || color.length == 6 || color.length == 8);

  red = int.parse(color.substring(0, 2), radix: 16) / 255;
  green = int.parse(color.substring(2, 4), radix: 16) / 255;
  blue = int.parse(color.substring(4, 6), radix: 16) / 255;

  if (color.length == 8) {
    alpha = int.parse(color.substring(6, 8), radix: 16) / 255;
  }

  return PdfColor(red, green, blue, alpha);
}