/// <summary>
/// Return the ARGB value for the color object that uses the Indexed or Tint property
/// </summary>
/// <param name="theColor">The color object</param>
/// <param name="schemeColors">The list of colors for the current color scheme</param>
/// <returns>The ARGB color starting with a "#". Or, if the color is not set: null.</returns>
public static string LookupColor(ExcelColor theColor, ICollection <SchemeColor> schemeColors = null)
{
string rawColorString;
if (!string.IsNullOrEmpty(theColor.Rgb))
{
rawColorString = PrefixColorString(theColor.Rgb);
}
else if (!string.IsNullOrEmpty(theColor.Theme) && Regex.IsMatch(theColor.Theme, @"^\d+$"))
{
var index = int.Parse(theColor.Theme);
rawColorString = Enum.IsDefined(typeof(ThemeColorName), index)
? PrefixColorString(schemeColors?.FirstOrDefault(x => x.ThemeColorName == (ThemeColorName)index)?.Value)
: null;
}
else if (theColor.Indexed == null)
{
rawColorString = null;
}
else
{
switch (theColor.Indexed.Value)
{
case 64:
// System Foreground, get from theme color scheme, otherwise assume black
rawColorString = PrefixColorString(schemeColors?.FirstOrDefault(x => x.ThemeColorName == ThemeColorName.Dark1)?.Value ?? "000000");
break;
case 65:
// System Background, get from theme color scheme, otherwise assume white
rawColorString = PrefixColorString(schemeColors?.FirstOrDefault(x => x.ThemeColorName == ThemeColorName.Light1)?.Value ?? "FFFFFF");
break;
default:
rawColorString = RgbLookup.ElementAtOrDefault(theColor.Indexed.Value);
break;
}
}
return(ApplyTint(rawColorString, theColor.Tint ?? 0));
}
/// <summary>
/// Return the RGB value for the color object that uses the Indexed or Tint property
/// </summary>
/// <param name="theColor">The color object</param>
/// <returns>The RGB color starting with a #</returns>
public string LookupColor(ExcelColor theColor)
{
//Thanks to neaves for contributing this method.
int iTint = 0;
string translatedRGB = "";
// reference extracted from ECMA-376, Part 4, Section 3.8.26 or 18.8.27 SE Part 1
string[] rgbLookup =
{
"#FF000000", // 0
"#FFFFFFFF",
"#FFFF0000",
"#FF00FF00",
"#FF0000FF",
"#FFFFFF00",
"#FFFF00FF",
"#FF00FFFF",
"#FF000000", // 8
"#FFFFFFFF",
"#FFFF0000",
"#FF00FF00",
"#FF0000FF",
"#FFFFFF00",
"#FFFF00FF",
"#FF00FFFF",
"#FF800000",
"#FF008000",
"#FF000080",
"#FF808000",
"#FF800080",
"#FF008080",
"#FFC0C0C0",
"#FF808080",
"#FF9999FF",
"#FF993366",
"#FFFFFFCC",
"#FFCCFFFF",
"#FF660066",
"#FFFF8080",
"#FF0066CC",
"#FFCCCCFF",
"#FF000080",
"#FFFF00FF",
"#FFFFFF00",
"#FF00FFFF",
"#FF800080",
"#FF800000",
"#FF008080",
"#FF0000FF",
"#FF00CCFF",
"#FFCCFFFF",
"#FFCCFFCC",
"#FFFFFF99",
"#FF99CCFF",
"#FFFF99CC",
"#FFCC99FF",
"#FFFFCC99",
"#FF3366FF",
"#FF33CCCC",
"#FF99CC00",
"#FFFFCC00",
"#FFFF9900",
"#FFFF6600",
"#FF666699",
"#FF969696",
"#FF003366",
"#FF339966",
"#FF003300",
"#FF333300",
"#FF993300",
"#FF993366",
"#FF333399",
"#FF333333", // 63
};
if ((0 <= theColor.Indexed) && (rgbLookup.Length > theColor.Indexed))
{
// coloring by pre-set color codes
translatedRGB = rgbLookup[theColor.Indexed];
}
else if (null != theColor.Rgb && 0 < theColor.Rgb.Length)
{
// coloring by RGB value ("FFRRGGBB")
translatedRGB = "#" + theColor.Rgb;
}
else
{
// coloring by shades of grey (-1 -> 0)
iTint = ((int)(theColor.Tint * 160) + 0x80);
translatedRGB = ((int)(decimal.Round(theColor.Tint * -512))).ToString("X");
translatedRGB = "#FF" + translatedRGB + translatedRGB + translatedRGB;
}
return(translatedRGB);
}
/// <summary>
/// Return the RGB value for the color object that uses the Indexed or Tint property
/// </summary>
/// <param name="theColor">The color object</param>
/// <returns>The RGB color starting with a #</returns>
public string LookupColor(ExcelColor theColor)
{
//Thanks to neaves for contributing this method.
int iTint = 0;
string translatedRGB = "";
// reference extracted from ECMA-376, Part 4, Section 3.8.26
string[] rgbLookup =
{
"#FF000000", // 0
"#FFFFFFFF",
"#FFFF0000",
"#FF00FF00",
"#FF0000FF",
"#FFFFFF00",
"#FFFF00FF",
"#FF00FFFF",
"#FF000000", // 8
"#FFFFFFFF",
"#FFFF0000",
"#FF00FF00",
"#FF0000FF",
"#FFFFFF00",
"#FFFF00FF",
"#FF00FFFF",
"#FF800000",
"#FF008000",
"#FF000080",
"#FF808000",
"#FF800080",
"#FF008080",
"#FFC0C0C0",
"#FF808080",
"#FF9999FF",
"#FF993366",
"#FFFFFFCC",
"#FFCCFFFF",
"#FF660066",
"#FFFF8080",
"#FF0066CC",
"#FFCCCCFF",
"#FF000080",
"#FFFF00FF",
"#FFFFFF00",
"#FF00FFFF",
"#FF800080",
"#FF800000",
"#FF008080",
"#FF0000FF",
"#FF00CCFF",
"#FFCCFFFF",
"#FFCCFFCC",
"#FFFFFF99",
"#FF99CCFF",
"#FFFF99CC",
"#FFCC99FF",
"#FFFFCC99",
"#FF3366FF",
"#FF33CCCC",
"#FF99CC00",
"#FFFFCC00",
"#FFFF9900",
"#FFFF6600",
"#FF666699",
"#FF969696",
"#FF003366",
"#FF339966",
"#FF003300",
"#FF333300",
"#FF993300",
"#FF993366",
"#FF333399",
"#FF333333", // 63
};
if ((0 <= theColor.Indexed) && (rgbLookup.Length > theColor.Indexed))
{
// coloring by pre-set color codes
translatedRGB = rgbLookup[theColor.Indexed];
}
else if (null != theColor.Rgb && 0 < theColor.Rgb.Length)
{
// coloring by RGB value ("FFRRGGBB")
translatedRGB = "#" + theColor.Rgb;
}
else
{
// coloring by shades of grey (-1 -> 0)
iTint = ((int)(theColor.Tint * 160) + 0x80);
translatedRGB = ((int)(decimal.Round(theColor.Tint * -512))).ToString("X");
translatedRGB = "#FF" + translatedRGB + translatedRGB + translatedRGB;
}
return translatedRGB;
}
/// <summary>
/// Return the RGB value as a string for the color object that uses the Indexed or Tint property
/// </summary>
/// <param name="theColor">The color object</param>
/// <returns>The RGB color starting with a #FF (alpha)</returns>
public string LookupColor(ExcelColor theColor)
{
string[] argbColor =
{
"#FF000000", // 0
"#FFFFFFFF",
"#FFFF0000",
"#FF00FF00",
"#FF0000FF",
"#FFFFFF00",
"#FFFF00FF",
"#FF00FFFF",
"#FF000000", // 8
"#FFFFFFFF",
"#FFFF0000",
"#FF00FF00",
"#FF0000FF",
"#FFFFFF00",
"#FFFF00FF",
"#FF00FFFF",
"#FF800000",
"#FF008000",
"#FF000080",
"#FF808000",
"#FF800080",
"#FF008080",
"#FFC0C0C0",
"#FF808080",
"#FF9999FF",
"#FF993366",
"#FFFFFFCC",
"#FFCCFFFF",
"#FF660066",
"#FFFF8080",
"#FF0066CC",
"#FFCCCCFF",
"#FF000080",
"#FFFF00FF",
"#FFFFFF00",
"#FF00FFFF",
"#FF800080",
"#FF800000",
"#FF008080",
"#FF0000FF",
"#FF00CCFF",
"#FFCCFFFF",
"#FFCCFFCC",
"#FFFFFF99",
"#FF99CCFF",
"#FFFF99CC",
"#FFCC99FF",
"#FFFFCC99",
"#FF3366FF",
"#FF33CCCC",
"#FF99CC00",
"#FFFFCC00",
"#FFFF9900",
"#FFFF6600",
"#FF666699",
"#FF969696",
"#FF003366",
"#FF339966",
"#FF003300",
"#FF333300",
"#FF993300",
"#FF993366",
"#FF333399",
"#FF333333", // 63
};
if (theColor.Indexed >= 0 && theColor.Indexed < argbColor.Length)
{
return(argbColor[theColor.Indexed]);
}
else if (theColor.Rgb != null && theColor.Rgb.Length > 0)
{
return("#" + theColor.Rgb);
}
else
{
var c = ((int)(Math.Round((theColor.Tint + 1) * 128))).ToString("X");
return("#FF" + c + c + c);
}
}