/// <summary>
/// Attempts to parse the specified <paramref name="str"/> into an instance of <see cref="RgbColor"/>.
/// </summary>
/// <param name="str">The input string to be parsed.</param>
/// <param name="color">An instance of <see cref="RgbColor"/>.</param>
/// <returns><c>true</c> if <paramref name="str"/> was converted successfully; otherwise, <c>false</c>.</returns>
public static bool TryParse(string str, out RgbColor color)
{
color = null;
// Attempt to parse the input string
if (!ColorHelpers.TryParse(str, out IColor result))
{
return(false);
}
// Convert the color to RGB
color = result as RgbColor ?? result.ToRgb();
return(true);
}
/// <summary>
/// Attempts to parse the specified <paramref name="str"/> into an instance of <see cref="IColor"/>.
/// </summary>
/// <param name="str">The input string to be parsed.</param>
/// <param name="color">An instance of <see cref="IColor"/>.</param>
/// <returns><c>true</c> if <paramref name="str"/> was converted successfully; otherwise, <c>false</c>.</returns>
public static bool TryParse(string str, out IColor color)
{
color = null;
// Return "false" if the string is empty
if (String.IsNullOrWhiteSpace(str))
{
return(false);
}
// Strip a leading hashtag and convert to lowercase
str = str.TrimStart('#').ToLower();
// Time for some regex :D
Match m1 = Regex.Match(str, "^([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$");
Match m2 = Regex.Match(str, "^([0-9a-f]{1})([0-9a-f]{1})([0-9a-f]{1})$");
Match m3 = Regex.Match(str, "^hsl\\(([0-9]+), ([0-9]+)%, ([0-9]+)%\\)$");
if (m1.Success)
{
Byte.TryParse(m1.Groups[1].Value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out byte r);
Byte.TryParse(m1.Groups[2].Value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out byte g);
Byte.TryParse(m1.Groups[3].Value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out byte b);
color = new RgbColor(r, g, b);
return(true);
}
if (m2.Success)
{
Byte.TryParse(m2.Groups[1].Value + m2.Groups[1].Value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out byte r);
Byte.TryParse(m2.Groups[2].Value + m2.Groups[2].Value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out byte g);
Byte.TryParse(m2.Groups[3].Value + m2.Groups[3].Value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out byte b);
color = new RgbColor(r, g, b);
return(true);
}
if (m3.Success)
{
float h = Int32.Parse(m3.Groups[1].Value) / 360f;
float s = Int32.Parse(m3.Groups[2].Value) / 100f;
float l = Int32.Parse(m3.Groups[3].Value) / 100f;
color = new HslColor(h, s, l);
return(true);
}
return(false);
}
/// <summary>
/// Returns the inverted color.
/// </summary>
/// <param name="color">The input color.</param>
/// <returns>An instance of <see cref="IColor"/> representing the output color.</returns>
public static IColor Invert(this IColor color)
{
switch (color)
{
case IAlphaColor alpha:
RgbaColor rgba = alpha as RgbaColor ?? alpha.ToRgba();
return(new RgbaColor(~rgba.R, ~rgba.G, ~rgba.B, rgba.Alpha));
default:
RgbColor rgb = color as RgbColor ?? color.ToRgb();
return(new RgbColor(~rgb.Red, ~rgb.Green, ~rgb.Blue));
}
}
/// <summary>
/// Returns the inverted color.
/// </summary>
/// <param name="color">The input color.</param>
/// <returns>An instance of <see cref="IColor"/> representing the output color.</returns>
public static IColor Invert(this IColor color)
{
RgbColor rgb = color as RgbColor ?? color.ToRgb();
return(new RgbColor(~rgb.Red, ~rgb.Green, ~rgb.Blue, rgb.Alpha));
}
