/// <summary>
/// Read the common properties and include the href chain recursively
/// </summary>
private void ReadGradientProperties(XElement gradientElem, double opacity, GraphicGradientBrush gradientBrush)
{
void ReadHrefGradientPropertiesRecurse(XElement gradientElemRecurse, double opacityRecurse, GraphicGradientBrush gradientBrushRecurse)
{
var hrefAttribute = gradientElemRecurse.Attribute(xlink + "href");
if (hrefAttribute == null)
{
hrefAttribute = gradientElemRecurse.Attribute("href");
}
if (hrefAttribute != null)
{
var id = hrefAttribute.Value.Substring(1);
if (globalDefinitions.ContainsKey(id))
{
var hrefElem = globalDefinitions[id];
ReadHrefGradientPropertiesRecurse(hrefElem, opacityRecurse, gradientBrushRecurse);
}
}
GetCommonGradientProperties(gradientElemRecurse, opacityRecurse, gradientBrushRecurse);
}
gradientBrush.GradientStops = new List <GraphicGradientStop>();
gradientBrush.MappingMode = GraphicBrushMappingMode.RelativeToBoundingBox;
ReadHrefGradientPropertiesRecurse(gradientElem, opacity, gradientBrush);
}
/// <summary>
/// Write a shading pattern definition
/// </summary>
private void WriteShadingPattern(string shadingType, GraphicGradientBrush gradientBrush, Rect boundingBox, string coords)
{
outputStream.WriteLine("[/Pattern] setcolorspace");
outputStream.WriteLine("<<");
outputStream.WriteLine("/PatternType 2");
outputStream.WriteLine("/Shading");
outputStream.WriteLine("<<");
outputStream.WriteLine($"/ShadingType {shadingType}");
outputStream.WriteLine("/ColorSpace [/DeviceRGB]");
outputStream.WriteLine(coords);
outputStream.WriteLine("/Domain [0 1]");
outputStream.WriteLine("/Extend [true true]");
outputStream.WriteLine("/Function");
if (gradientBrush.GradientStops.Count == 2)
{
WriteExponentialFunction(gradientBrush.GradientStops[0].Color, gradientBrush.GradientStops[1].Color);
}
else
{
WriteStitchingFunction(gradientBrush.GradientStops);
}
outputStream.WriteLine(">>");
outputStream.WriteLine(">>");
outputStream.WriteLine("matrix");
outputStream.WriteLine("makepattern");
outputStream.WriteLine("setcolor");
}
/// <summary>
/// Write a linear shading definition
/// </summary>
private void WriteLinearShading(GraphicGradientBrush gradientBrush, Rect boundingBox)
{
string startPointStr = FormatPoint(GetAbsolutePosition(boundingBox, gradientBrush.StartPoint));
string endPointStr = FormatPoint(GetAbsolutePosition(boundingBox, gradientBrush.EndPoint));
string coordsStr = $"/Coords [{startPointStr} {endPointStr}]";
WriteShadingPattern("2", gradientBrush, boundingBox, coordsStr);
}
/// <summary>
/// Get common gradient properties for linear and radial gradient
/// </summary>
private void GetCommonGradientProperties(XElement gradientElem, double opacity, GraphicGradientBrush gradientBrush)
{
var gradientUnitsAttribute = gradientElem.Attribute("gradientUnits");
if (gradientUnitsAttribute != null)
{
switch (gradientUnitsAttribute.Value)
{
case "userSpaceOnUse":
gradientBrush.MappingMode = GraphicBrushMappingMode.Absolute;
break;
case "objectBoundingBox":
gradientBrush.MappingMode = GraphicBrushMappingMode.RelativeToBoundingBox;
break;
}
}
foreach (var stopElem in gradientElem.Elements(svgNamespace + "stop"))
{
cssStyleCascade.PushStyles(stopElem);
var stop = new GraphicGradientStop();
gradientBrush.GradientStops.Add(stop);
double retVal;
(_, retVal) = doubleParser.GetNumberPercent(stopElem, "offset", 0);
stop.Position = retVal;
var stopOpacity = cssStyleCascade.GetNumberPercentFromTop("stop-opacity", 1);
var colorAttr = cssStyleCascade.GetPropertyFromTop("stop-color");
if (colorAttr != null &&
ColorParser.TryParseColor(colorAttr, opacity * stopOpacity, out Color color))
{
stop.Color = color;
}
else
{
stop.Color = Colors.Black;
}
cssStyleCascade.Pop();
}
}
/// <summary>
/// Get common gradient properties for linear and radial gradient
/// </summary>
private void GetCommonGradientProperties(XElement gradientElem, double opacity, GraphicGradientBrush gradientBrush)
{
var gradientUnitsAttribute = gradientElem.Attribute("gradientUnits");
if (gradientUnitsAttribute != null)
{
switch (gradientUnitsAttribute.Value)
{
case "userSpaceOnUse":
gradientBrush.MappingMode = GraphicBrushMappingMode.Absolute;
break;
case "objectBoundingBox":
gradientBrush.MappingMode = GraphicBrushMappingMode.RelativeToBoundingBox;
break;
}
}
foreach (var stopElem in gradientElem.Elements(svgNamespace + "stop"))
{
var stop = new GraphicGradientStop();
gradientBrush.GradientStops.Add(stop);
stop.Position = GetDoubleAttribute(stopElem, "offset", 0);
var stopOpacity = GetDoubleAttribute(stopElem, "stop-opacity", 1);
XAttribute colorAttr = stopElem.Attribute("stop-color");
Color color;
if (colorAttr != null)
{
color = (Color)ColorConverter.ConvertFromString(colorAttr.Value);
}
else
{
color = Colors.Black;
}
stop.Color = Color.FromArgb((byte)(opacity * stopOpacity * 255), color.R, color.G, color.B);
}
}