| public ConvertFrom ( System context, System culture, object value ) : object | ||
| context | System | A |
| culture | System | A |
| value | object | The object to convert. |
| return | object | |
public override object ConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
{
string colour = value as string;
if (colour != null)
{
var oldCulture = Thread.CurrentThread.CurrentCulture;
Thread.CurrentThread.CurrentCulture = System.Globalization.CultureInfo.InvariantCulture;
colour = colour.Trim();
if (colour.StartsWith("rgb"))
{
try
{
int start = colour.IndexOf("(") + 1;
//get the values from the RGB string
string[] values = colour.Substring(start, colour.IndexOf(")") - start).Split(new char[]{',', ' '}, StringSplitOptions.RemoveEmptyEntries);
//determine the alpha value if this is an RGBA (it will be the 4th value if there is one)
int alphaValue = 255;
if (values.Length > 3)
{
//the alpha portion of the rgba is not an int 0-255 it is a decimal between 0 and 1
//so we have to determine the corosponding byte value
var alphastring = values[3];
if(alphastring.StartsWith("."))
{
alphastring = "0" + alphastring;
}
var alphaDecimal = decimal.Parse(alphastring);
if(alphaDecimal <= 1)
{
alphaValue = (int)(alphaDecimal * 255);
}
else
{
alphaValue = (int)alphaDecimal;
}
}
Color colorpart = System.Drawing.Color.FromArgb(alphaValue, int.Parse(values[0]), int.Parse(values[1]), int.Parse(values[2]));
return colorpart;
}
catch
{
throw new SvgException("Colour is in an invalid format: '" + colour + "'");
}
}
else if (colour.StartsWith("#") && colour.Length == 4)
{
colour = string.Format(culture, "#{0}{0}{1}{1}{2}{2}", colour[1], colour[2], colour[3]);
return base.ConvertFrom(context, culture, colour);
}
Thread.CurrentThread.CurrentCulture = oldCulture;
}
return base.ConvertFrom(context, culture, value);
}
public static SvgPaintServer Create(string value, SvgDocument document)
{
// If it's pointing to a paint server
if (string.IsNullOrEmpty(value))
{
return(SvgColourServer.NotSet);
}
else if (value == "inherit")
{
return(SvgColourServer.Inherit);
}
else if (value == "currentColor")
{
return(new SvgDeferredPaintServer(document, value));
}
else
{
var servers = new List <SvgPaintServer>();
while (!string.IsNullOrEmpty(value))
{
if (value.StartsWith("url(#"))
{
var leftParen = value.IndexOf(')', 5);
Uri id = new Uri(value.Substring(5, leftParen - 5), UriKind.Relative);
value = value.Substring(leftParen + 1).Trim();
servers.Add((SvgPaintServer)document.IdManager.GetElementById(id));
}
// If referenced to to a different (linear or radial) gradient
else if (document.IdManager.GetElementById(value) != null && document.IdManager.GetElementById(value).GetType().BaseType == typeof(SvgGradientServer))
{
return((SvgPaintServer)document.IdManager.GetElementById(value));
}
else if (value.StartsWith("#")) // Otherwise try and parse as colour
{
switch (CountHexDigits(value, 1))
{
case 3:
servers.Add(new SvgColourServer((Color)_colourConverter.ConvertFrom(value.Substring(0, 4))));
value = value.Substring(4).Trim();
break;
case 6:
servers.Add(new SvgColourServer((Color)_colourConverter.ConvertFrom(value.Substring(0, 7))));
value = value.Substring(7).Trim();
break;
default:
return(new SvgDeferredPaintServer(document, value));
}
}
else
{
return(new SvgColourServer((Color)_colourConverter.ConvertFrom(value.Trim())));
}
}
if (servers.Count > 1)
{
return(new SvgFallbackPaintServer(servers[0], servers.Skip(1)));
}
return(servers[0]);
}
}
