protected void Clip(GdiGraphicsWrapper gr)
{
if (element == null)
{
return;
}
SvgRenderingHint hint = element.RenderingHint;
// todo: should we correct the clipping to adjust to the off-one-pixel drawing?
gr.TranslateClip(1, 1);
#region Clip with clip
// see http://www.w3.org/TR/SVG/masking.html#OverflowAndClipProperties
if (element is ISvgSvgElement || element is ISvgMarkerElement ||
element is ISvgSymbolElement || element is ISvgPatternElement)
{
// check overflow property
CssValue overflow = ((SvgElement)element).GetComputedCssValue("overflow", String.Empty) as CssValue;
// TODO: clip can have "rect(10 10 auto 10)"
CssPrimitiveValue clip = ((SvgElement)element).GetComputedCssValue("clip", String.Empty) as CssPrimitiveValue;
string sOverflow = null;
if (overflow != null || overflow.CssText == "")
{
sOverflow = overflow.CssText;
}
else
{
if (this is ISvgSvgElement)
sOverflow = "hidden";
}
if (sOverflow != null)
{
// "If the 'overflow' property has a value other than hidden or scroll, the property has no effect (i.e., a clipping rectangle is not created)."
if (sOverflow == "hidden" || sOverflow == "scroll")
{
RectangleF clipRect = RectangleF.Empty;
if (clip != null && clip.PrimitiveType == CssPrimitiveType.Rect)
{
if (element is ISvgSvgElement)
{
ISvgSvgElement svgElement = (ISvgSvgElement)element;
SvgRect viewPort = svgElement.Viewport as SvgRect;
clipRect = GdiConverter.ToRectangle(viewPort);
ICssRect clipShape = (CssRect)clip.GetRectValue();
if (clipShape.Top.PrimitiveType != CssPrimitiveType.Ident)
clipRect.Y += (float)clipShape.Top.GetFloatValue(CssPrimitiveType.Number);
if (clipShape.Left.PrimitiveType != CssPrimitiveType.Ident)
clipRect.X += (float)clipShape.Left.GetFloatValue(CssPrimitiveType.Number);
if (clipShape.Right.PrimitiveType != CssPrimitiveType.Ident)
clipRect.Width = (clipRect.Right - clipRect.X) - (float)clipShape.Right.GetFloatValue(CssPrimitiveType.Number);
if (clipShape.Bottom.PrimitiveType != CssPrimitiveType.Ident)
clipRect.Height = (clipRect.Bottom - clipRect.Y) - (float)clipShape.Bottom.GetFloatValue(CssPrimitiveType.Number);
}
}
else if (clip == null || (clip.PrimitiveType == CssPrimitiveType.Ident && clip.GetStringValue() == "auto"))
{
if (element is ISvgSvgElement)
{
ISvgSvgElement svgElement = (ISvgSvgElement)element;
SvgRect viewPort = svgElement.Viewport as SvgRect;
clipRect = GdiConverter.ToRectangle(viewPort);
}
else if (element is ISvgMarkerElement ||
element is ISvgSymbolElement ||
element is ISvgPatternElement)
{
// TODO: what to do here?
}
}
if (clipRect != RectangleF.Empty)
{
gr.SetClip(clipRect);
}
}
}
}
#endregion
#region Clip with clip-path
// see: http://www.w3.org/TR/SVG/masking.html#EstablishingANewClippingPath
if (hint == SvgRenderingHint.Shape || hint == SvgRenderingHint.Text ||
hint == SvgRenderingHint.Clipping || hint == SvgRenderingHint.Masking ||
hint == SvgRenderingHint.Containment)
{
CssPrimitiveValue clipPath = ((SvgElement)element).GetComputedCssValue("clip-path", String.Empty) as CssPrimitiveValue;
if (clipPath != null && clipPath.PrimitiveType == CssPrimitiveType.Uri)
{
string absoluteUri = ((SvgElement)element).ResolveUri(clipPath.GetStringValue());
SvgClipPathElement eClipPath = element.OwnerDocument.GetNodeByUri(absoluteUri) as SvgClipPathElement;
if (eClipPath != null)
{
GraphicsPath gpClip = CreateClippingRegion(eClipPath);
RectangleF clipBounds = gpClip != null ? gpClip.GetBounds() : RectangleF.Empty;
if (clipBounds.Width == 0 || clipBounds.Height == 0)
{
return;
}
SvgUnitType pathUnits = (SvgUnitType)eClipPath.ClipPathUnits.AnimVal;
if (pathUnits == SvgUnitType.ObjectBoundingBox)
{
SvgTransformableElement transElement = element as SvgTransformableElement;
if (transElement != null)
{
ISvgRect bbox = transElement.GetBBox();
// scale clipping path
Matrix matrix = new Matrix();
matrix.Scale((float)bbox.Width, (float)bbox.Height);
gpClip.Transform(matrix);
gr.SetClip(gpClip);
// offset clip
gr.TranslateClip((float)bbox.X, (float)bbox.Y);
}
else
{
throw new NotImplementedException("clip-path with SvgUnitType.ObjectBoundingBox "
+ "not supported for this type of element: " + element.GetType());
}
}
else
{
gr.SetClip(gpClip);
}
gpClip.Dispose();
gpClip = null;
}
}
}
#endregion
}
protected void Clip(GdiGraphicsWrapper gr)
{
if (element == null)
{
return;
}
SvgRenderingHint hint = element.RenderingHint;
// todo: should we correct the clipping to adjust to the off-one-pixel drawing?
gr.TranslateClip(1, 1);
#region Clip with clip
// see http://www.w3.org/TR/SVG/masking.html#OverflowAndClipProperties
if (element is ISvgSvgElement || element is ISvgMarkerElement ||
element is ISvgSymbolElement || element is ISvgPatternElement)
{
// check overflow property
CssValue overflow = ((SvgElement)element).GetComputedCssValue("overflow", String.Empty) as CssValue;
// TODO: clip can have "rect(10 10 auto 10)"
CssPrimitiveValue clip = ((SvgElement)element).GetComputedCssValue("clip", String.Empty) as CssPrimitiveValue;
string sOverflow = null;
if (overflow != null || overflow.CssText == "")
{
sOverflow = overflow.CssText;
}
else
{
if (this is ISvgSvgElement)
{
sOverflow = "hidden";
}
}
if (sOverflow != null)
{
// "If the 'overflow' property has a value other than hidden or scroll, the property has no effect (i.e., a clipping rectangle is not created)."
if (sOverflow == "hidden" || sOverflow == "scroll")
{
RectangleF clipRect = RectangleF.Empty;
if (clip != null && clip.PrimitiveType == CssPrimitiveType.Rect)
{
if (element is ISvgSvgElement)
{
ISvgSvgElement svgElement = (ISvgSvgElement)element;
SvgRect viewPort = svgElement.Viewport as SvgRect;
clipRect = GdiConverter.ToRectangle(viewPort);
ICssRect clipShape = (CssRect)clip.GetRectValue();
if (clipShape.Top.PrimitiveType != CssPrimitiveType.Ident)
{
clipRect.Y += (float)clipShape.Top.GetFloatValue(CssPrimitiveType.Number);
}
if (clipShape.Left.PrimitiveType != CssPrimitiveType.Ident)
{
clipRect.X += (float)clipShape.Left.GetFloatValue(CssPrimitiveType.Number);
}
if (clipShape.Right.PrimitiveType != CssPrimitiveType.Ident)
{
clipRect.Width = (clipRect.Right - clipRect.X) - (float)clipShape.Right.GetFloatValue(CssPrimitiveType.Number);
}
if (clipShape.Bottom.PrimitiveType != CssPrimitiveType.Ident)
{
clipRect.Height = (clipRect.Bottom - clipRect.Y) - (float)clipShape.Bottom.GetFloatValue(CssPrimitiveType.Number);
}
}
}
else if (clip == null || (clip.PrimitiveType == CssPrimitiveType.Ident && clip.GetStringValue() == "auto"))
{
if (element is ISvgSvgElement)
{
ISvgSvgElement svgElement = (ISvgSvgElement)element;
SvgRect viewPort = svgElement.Viewport as SvgRect;
clipRect = GdiConverter.ToRectangle(viewPort);
}
else if (element is ISvgMarkerElement ||
element is ISvgSymbolElement ||
element is ISvgPatternElement)
{
// TODO: what to do here?
}
}
if (clipRect != RectangleF.Empty)
{
gr.SetClip(clipRect);
}
}
}
}
#endregion
#region Clip with clip-path
// see: http://www.w3.org/TR/SVG/masking.html#EstablishingANewClippingPath
if (hint == SvgRenderingHint.Shape || hint == SvgRenderingHint.Text ||
hint == SvgRenderingHint.Clipping || hint == SvgRenderingHint.Masking ||
hint == SvgRenderingHint.Containment)
{
CssPrimitiveValue clipPath = ((SvgElement)element).GetComputedCssValue("clip-path", String.Empty) as CssPrimitiveValue;
if (clipPath != null && clipPath.PrimitiveType == CssPrimitiveType.Uri)
{
string absoluteUri = ((SvgElement)element).ResolveUri(clipPath.GetStringValue());
SvgClipPathElement eClipPath = element.OwnerDocument.GetNodeByUri(absoluteUri) as SvgClipPathElement;
if (eClipPath != null)
{
GraphicsPath gpClip = CreateClippingRegion(eClipPath);
RectangleF clipBounds = gpClip != null?gpClip.GetBounds() : RectangleF.Empty;
if (clipBounds.Width == 0 || clipBounds.Height == 0)
{
return;
}
SvgUnitType pathUnits = (SvgUnitType)eClipPath.ClipPathUnits.AnimVal;
if (pathUnits == SvgUnitType.ObjectBoundingBox)
{
SvgTransformableElement transElement = element as SvgTransformableElement;
if (transElement != null)
{
ISvgRect bbox = transElement.GetBBox();
// scale clipping path
Matrix matrix = new Matrix();
matrix.Scale((float)bbox.Width, (float)bbox.Height);
gpClip.Transform(matrix);
gr.SetClip(gpClip);
// offset clip
gr.TranslateClip((float)bbox.X, (float)bbox.Y);
}
else
{
throw new NotImplementedException("clip-path with SvgUnitType.ObjectBoundingBox "
+ "not supported for this type of element: " + element.GetType());
}
}
else
{
gr.SetClip(gpClip);
}
gpClip.Dispose();
gpClip = null;
}
}
}
#endregion
}