public PDFResource GetLinearShadingPattern(PDFGraphics g, string key, PDFGradientLinearDescriptor descriptor, PDFRect bounds)
{
PDFLinearShadingPattern pattern = new PDFLinearShadingPattern(g.Container.Document, key, descriptor, bounds);
return(pattern);
}
/// <summary>
/// Parses a linear gradient from a string without decorations e.g. "to top right, red, green
/// </summary>
/// <param name="value"></param>
/// <param name="linear"></param>
/// <returns></returns>
public static bool TryParseLinear(string value, out PDFGradientLinearDescriptor linear)
{
linear = null;
string[] all = _splitter.Split(value);
if (all.Length == 0)
{
return(false);
}
int colorStopIndex = 0;
double angle;
if (all[0].StartsWith("to "))
{
var ga = all[0].Substring(3).Trim().Replace(" ", "_");
GradientAngle parsed;
if (Enum.TryParse(ga, true, out parsed))
{
angle = (double)parsed;
}
else
{
return(false);
}
colorStopIndex = 1;
}
else if (char.IsNumber(all[0], 0))
{
var deg = all[0];
if (deg.EndsWith("deg"))
{
deg = deg.Substring(0, deg.Length - 3);
}
if (!double.TryParse(deg, out angle))
{
return(false);
}
colorStopIndex = 1;
}
else
{
angle = (double)GradientAngle.Bottom;
}
PDFGradientColor[] colors = new PDFGradientColor[all.Length - colorStopIndex];
for (int i = 0; i < colors.Length; i++)
{
PDFGradientColor parsed;
if (PDFGradientColor.TryParse(all[i + colorStopIndex], out parsed))
{
colors[i] = parsed;
}
else
{
return(false);
}
}
linear = new PDFGradientLinearDescriptor()
{
Angle = angle, Colors = new List <PDFGradientColor>(colors)
};
return(true);
}
/// <summary>
/// Attempts to parse a css style gradient string into a specific gradient descriptor
/// </summary>
/// <param name="value">The string to parse e.g. radial-gradient(red, green)</param>
/// <param name="descriptor">Set to the parsed descriptor value</param>
/// <returns>True if the gradient was parsed correctly</returns>
public static bool TryParse(string value, out PDFGradientDescriptor descriptor)
{
descriptor = null;
if (null == value)
{
return(false);
}
value = value.Trim();
if (string.IsNullOrEmpty(value))
{
return(false);
}
else if (value.StartsWith("linear-gradient"))
{
value = value.Substring("linear-gradient".Length).Trim();
PDFGradientLinearDescriptor linear;
if (value.StartsWith("(") && value.EndsWith(")") && PDFGradientLinearDescriptor.TryParseLinear(value.Substring(1, value.Length - 2), out linear))
{
linear.Repeating = false;
descriptor = linear;
return(true);
}
}
else if (value.StartsWith("repeating-linear-gradient"))
{
value = value.Substring("repeating-linear-gradient".Length).Trim();
PDFGradientLinearDescriptor linear;
if (value.StartsWith("(") && value.EndsWith(")") && PDFGradientLinearDescriptor.TryParseLinear(value.Substring(1, value.Length - 2), out linear))
{
linear.Repeating = true;
descriptor = linear;
return(true);
}
}
else if (value.StartsWith("radial-gradient"))
{
value = value.Substring("radial-gradient".Length).Trim();
PDFGradientRadialDescriptor radial;
if (value.StartsWith("(") && value.EndsWith(")") && PDFGradientRadialDescriptor.TryParseRadial(value.Substring(1, value.Length - 2), out radial))
{
radial.Repeating = false;
descriptor = radial;
return(true);
}
}
else if (value.StartsWith("repeating-radial-gradient"))
{
value = value.Substring("repeating-radial-gradient".Length).Trim();
PDFGradientRadialDescriptor radial;
if (value.StartsWith("(") && value.EndsWith(")") && PDFGradientRadialDescriptor.TryParseRadial(value.Substring(1, value.Length - 2), out radial))
{
radial.Repeating = true;
descriptor = radial;
return(true);
}
}
return(false);
}
public PDFGradientLinearBrush(PDFGradientLinearDescriptor descriptor) : base(descriptor)
{
this._descriptor = descriptor;
}