public static SideBorder Parse(String str)
{
if (str == null)
{
return(SideBorder.Empty);
}
// The properties of a border that can be set, are (in order): border-width, border-style, and border-color.
// It does not matter if one of the values above are missing, e.g. border:solid #ff0000; is allowed.
// The main problem for parsing this attribute is that the browsers allow any permutation of the values... meaning more coding :(
// http://www.w3schools.com/cssref/pr_border.asp
List <String> borderParts = new List <String>(str.Split(HttpUtility.WhiteSpaces, StringSplitOptions.RemoveEmptyEntries));
if (borderParts.Count == 0)
{
return(SideBorder.Empty);
}
// Initialize default values
Unit borderWidth = Unit.Empty;
HtmlColor borderColor = HtmlColor.Empty;
w.BorderValues borderStyle = w.BorderValues.Nil;
// Now try to guess the values with their permutation
// handle border style
for (int i = 0; i < borderParts.Count; i++)
{
borderStyle = Converter.ToBorderStyle(borderParts[i]);
if (borderStyle != w.BorderValues.Nil)
{
borderParts.RemoveAt(i); // no need to process this part anymore
break;
}
}
for (int i = 0; i < borderParts.Count; i++)
{
borderWidth = ParseWidth(borderParts[i]);
if (borderWidth.IsValid)
{
borderParts.RemoveAt(i); // no need to process this part anymore
break;
}
}
// find width
if (borderParts.Count > 0)
{
borderColor = HtmlColor.Parse(borderParts[0]);
}
// returns the instance with default value if needed.
// These value are the ones used by the browser, i.e: solid 3px black
return(new SideBorder(
borderStyle == w.BorderValues.Nil? w.BorderValues.Single : borderStyle,
borderColor.IsEmpty? HtmlColor.Black : borderColor,
borderWidth.IsFixed? borderWidth : new Unit(UnitMetric.Pixel, 4)));
}
/// <summary>
/// Tests whether the specified object is a HtmlColor structure and is equivalent to this color structure.
/// </summary>
public bool Equals(HtmlColor color)
{
return(color.A == A && color.R == R && color.G == G && color.B == B);
}
public SideBorder(w.BorderValues style, HtmlColor color, Unit size)
{
this.style = style;
this.color = color;
this.size = size;
}
/// <summary>
/// Convert a color using the HSL to RGB.
/// </summary>
/// <param name="alpha">The alpha component (0.0-1.0).</param>
/// <param name="hue">The Hue component (0.0 - 360.0).</param>
/// <param name="saturation">The saturation component (0.0 - 1.0).</param>
/// <param name="luminosity">The luminosity component (0.0 - 1.0).</param>
public static HtmlColor FromHsl(double alpha, double hue, double saturation, double luminosity)
{
if (alpha < 0.0 || alpha > 1.0)
{
throw new ArgumentOutOfRangeException(nameof(alpha), alpha, "Alpha should be comprised between 0.0 and 1.0");
}
if (hue < 0 || hue > 360)
{
throw new ArgumentOutOfRangeException(nameof(hue), hue, "Hue should be comprised between 0° and 360°");
}
if (saturation < 0 || saturation > 1)
{
throw new ArgumentOutOfRangeException(nameof(saturation), saturation, "Saturation should be comprised between 0.0 and 1.0");
}
if (luminosity < 0 || luminosity > 1)
{
throw new ArgumentOutOfRangeException(nameof(luminosity), luminosity, "Brightness should be comprised between 0.0 and 1.0");
}
if (0 == saturation)
{
return(HtmlColor.FromArgb(alpha, Convert.ToByte(luminosity * 255),
Convert.ToByte(luminosity * 255), Convert.ToByte(luminosity * 255)));
}
double fMax, fMid, fMin;
int iSextant;
if (0.5 < luminosity)
{
fMax = luminosity - (luminosity * saturation) + saturation;
fMin = luminosity + (luminosity * saturation) - saturation;
}
else
{
fMax = luminosity + (luminosity * saturation);
fMin = luminosity - (luminosity * saturation);
}
iSextant = (int)Math.Floor(hue / 60f);
if (300f <= hue)
{
hue -= 360f;
}
hue /= 60f;
hue -= 2f * (float)Math.Floor(((iSextant + 1f) % 6f) / 2f);
if (0 == iSextant % 2)
{
fMid = hue * (fMax - fMin) + fMin;
}
else
{
fMid = fMin - hue * (fMax - fMin);
}
byte iMax = Convert.ToByte(fMax * 255);
byte iMid = Convert.ToByte(fMid * 255);
byte iMin = Convert.ToByte(fMin * 255);
switch (iSextant)
{
case 1:
return(HtmlColor.FromArgb(alpha, iMid, iMax, iMin));
case 2:
return(HtmlColor.FromArgb(alpha, iMin, iMax, iMid));
case 3:
return(HtmlColor.FromArgb(alpha, iMin, iMid, iMax));
case 4:
return(HtmlColor.FromArgb(alpha, iMid, iMin, iMax));
case 5:
return(HtmlColor.FromArgb(alpha, iMax, iMin, iMid));
default:
return(HtmlColor.FromArgb(alpha, iMax, iMid, iMin));
}
}