/// <summary>Gives an array of four floats that contain RGBA values, each value is between 0 and 1.</summary>
/// <param name="name">
/// a name such as black, violet, cornflowerblue or #RGB or
/// #RRGGBB or RGB or RRGGBB or rgb(R,G,B) or rgb(R,G,B,A)
/// </param>
/// <returns>the corresponding array of four floats, or <c>null</c> if parsing failed.</returns>
public static float[] GetRGBAColor(String name)
{
float[] color = null;
try {
String colorName = name.ToLowerInvariant();
bool colorStrWithoutHash = MissingHashColorFormat(colorName);
if (colorName.StartsWith("#") || colorStrWithoutHash)
{
if (!colorStrWithoutHash)
{
// lop off the # to unify hex parsing.
colorName = colorName.Substring(1);
}
if (colorName.Length == 3)
{
String red = colorName.JSubstring(0, 1);
color = new float[] { 0, 0, 0, 1 };
color[0] = (float)(Convert.ToInt32(red + red, 16) / RGB_MAX_VAL);
String green = colorName.JSubstring(1, 2);
color[1] = (float)(Convert.ToInt32(green + green, 16) / RGB_MAX_VAL);
String blue = colorName.Substring(2);
color[2] = (float)(Convert.ToInt32(blue + blue, 16) / RGB_MAX_VAL);
}
else
{
if (colorName.Length == 6)
{
color = new float[] { 0, 0, 0, 1 };
color[0] = (float)(Convert.ToInt32(colorName.JSubstring(0, 2), 16) / RGB_MAX_VAL);
color[1] = (float)(Convert.ToInt32(colorName.JSubstring(2, 4), 16) / RGB_MAX_VAL);
color[2] = (float)(Convert.ToInt32(colorName.Substring(4), 16) / RGB_MAX_VAL);
}
else
{
ILog logger = LogManager.GetLogger(typeof(WebColors));
logger.Error(iText.IO.LogMessageConstant.UNKNOWN_COLOR_FORMAT_MUST_BE_RGB_OR_RRGGBB);
}
}
}
else
{
if (colorName.StartsWith("rgb("))
{
String delim = "rgb(), \t\r\n\f";
StringTokenizer tok = new StringTokenizer(colorName, delim);
color = new float[] { 0, 0, 0, 1 };
ParseRGBColors(color, tok);
}
else
{
if (colorName.StartsWith("rgba("))
{
String delim = "rgba(), \t\r\n\f";
StringTokenizer tok = new StringTokenizer(colorName, delim);
color = new float[] { 0, 0, 0, 1 };
ParseRGBColors(color, tok);
if (tok.HasMoreTokens())
{
color[3] = GetAlphaChannelValue(tok.NextToken());
}
}
else
{
if (NAMES.Contains(colorName))
{
int[] intColor = NAMES.Get(colorName);
color = new float[] { 0, 0, 0, 1 };
color[0] = (float)(intColor[0] / RGB_MAX_VAL);
color[1] = (float)(intColor[1] / RGB_MAX_VAL);
color[2] = (float)(intColor[2] / RGB_MAX_VAL);
}
}
}
}
}
catch (Exception) {
// Will just return null in this case
color = null;
}
return(color);
}
/// <summary>Gives you a BaseColor based on a name.</summary>
/// <param name="name">
/// a name such as black, violet, cornflowerblue or #RGB or
/// #RRGGBB or RGB or RRGGBB or rgb(R,G,B)
/// </param>
/// <returns>the corresponding BaseColor object. Never returns null.</returns>
/// <exception cref="System.ArgumentException">if the String isn't a know representation of a color.</exception>
public static DeviceRgb GetRGBColor(String name)
{
int[] color = new int[] { 0, 0, 0, 255 };
String colorName = name.ToLower(System.Globalization.CultureInfo.InvariantCulture);
bool colorStrWithoutHash = MissingHashColorFormat(colorName);
if (colorName.StartsWith("#") || colorStrWithoutHash)
{
if (!colorStrWithoutHash)
{
// lop off the # to unify hex parsing.
colorName = colorName.Substring(1);
}
if (colorName.Length == 3)
{
String red = colorName.JSubstring(0, 1);
color[0] = System.Convert.ToInt32(red + red, 16);
String green = colorName.JSubstring(1, 2);
color[1] = System.Convert.ToInt32(green + green, 16);
String blue = colorName.Substring(2);
color[2] = System.Convert.ToInt32(blue + blue, 16);
return(new DeviceRgb(color[0], color[1], color[2]));
}
if (colorName.Length == 6)
{
color[0] = System.Convert.ToInt32(colorName.JSubstring(0, 2), 16);
color[1] = System.Convert.ToInt32(colorName.JSubstring(2, 4), 16);
color[2] = System.Convert.ToInt32(colorName.Substring(4), 16);
return(new DeviceRgb(color[0], color[1], color[2]));
}
throw new PdfException(PdfException.UnknownColorFormatMustBeRGBorRRGGBB);
}
if (colorName.StartsWith("rgb("))
{
String delim = "rgb(), \t\r\n\f";
StringTokenizer tok = new StringTokenizer(colorName, delim);
for (int k = 0; k < 3; ++k)
{
if (tok.HasMoreTokens())
{
color[k] = GetRGBChannelValue(tok.NextToken());
color[k] = Math.Max(0, color[k]);
color[k] = Math.Min(255, color[k]);
}
}
return(new DeviceRgb(color[0], color[1], color[2]));
}
if (colorName.StartsWith("rgba("))
{
String delim = "rgba(), \t\r\n\f";
StringTokenizer tok = new StringTokenizer(colorName, delim);
for (int k = 0; k < 3; ++k)
{
if (tok.HasMoreTokens())
{
color[k] = GetRGBChannelValue(tok.NextToken());
color[k] = Math.Max(0, color[k]);
color[k] = Math.Min(255, color[k]);
}
}
return(new DeviceRgb(color[0], color[1], color[2]));
}
if (!NAMES.Contains(colorName))
{
throw new PdfException(PdfException.ColorNotFound).SetMessageParams(colorName);
}
color = NAMES.Get(colorName);
return(new DeviceRgb(color[0], color[1], color[2]));
}
