/// <summary>
/// Set the clipping of the group
/// </summary>
public static void SetClipPath(GraphicGroup group,
Matrix currentTransformationMatrix,
CssStyleCascade cssStyleCascade,
Dictionary <string, XElement> globalDefinitions)
{
var clipPath = cssStyleCascade.GetPropertyFromTop("clip-path");
if (string.IsNullOrEmpty(clipPath))
{
return;
}
if (!clipPath.StartsWith("url(", StringComparison.OrdinalIgnoreCase))
{
return;
}
int endUri = clipPath.IndexOf(")", StringComparison.OrdinalIgnoreCase);
var uri = clipPath.Substring(4, endUri - 4);
uri = uri.Trim();
var id = uri.Substring(1);
if (!globalDefinitions.ContainsKey(id))
{
return;
}
var clipElem = globalDefinitions[id];
// richt now we support only a single path for the clip geometry
var shapeElement = clipElem.Elements().First();
if (shapeElement == null)
{
return;
}
var clipGeometry = GeometryParser.Parse(shapeElement, currentTransformationMatrix);
clipGeometry.FillRule = GraphicFillRule.NoneZero;
var clipRule = cssStyleCascade.GetProperty("clip-rule");
if (!string.IsNullOrEmpty(clipRule))
{
switch (clipRule)
{
case "evenodd":
clipGeometry.FillRule = GraphicFillRule.EvenOdd;
break;
case "nonzero":
clipGeometry.FillRule = GraphicFillRule.NoneZero;
break;
}
}
group.Clip = clipGeometry;
}
/// <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>
/// Tests whether a clip path is set
/// </summary>
public bool IsClipPathSet()
{
var clipPath = cssStyleCascade.GetPropertyFromTop("clip-path");
return(!string.IsNullOrEmpty(clipPath));
}