public void PaintMarker(GdiGraphicsRenderer renderer, GdiGraphics gr,
SvgMarkerPosition markerPos, SvgStyleableElement refElement)
{
ISharpMarkerHost markerHostElm = (ISharpMarkerHost)refElement;
SvgMarkerElement markerElm = (SvgMarkerElement)_svgElement;
SvgPointF[] vertexPositions = markerHostElm.MarkerPositions;
if (vertexPositions == null)
{
return;
}
var comparer = StringComparison.OrdinalIgnoreCase;
bool mayHaveCurves = markerHostElm.MayHaveCurves;
int start;
int len;
// Choose which part of the position array to use
switch (markerPos)
{
case SvgMarkerPosition.Start:
start = 0;
len = 1;
break;
case SvgMarkerPosition.Mid:
start = 1;
len = vertexPositions.Length - 2;
break;
default:
// == MarkerPosition.End
start = vertexPositions.Length - 1;
len = 1;
break;
}
int end = start + len;
for (int i = start; i < end; i++)
{
SvgPointF point = vertexPositions[i];
GdiGraphicsContainer gc = gr.BeginContainer();
gr.TranslateTransform(point.X, point.Y);
if (markerElm.OrientType.AnimVal.Equals((ushort)SvgMarkerOrient.Angle))
{
double scaleValue = markerElm.OrientAngle.AnimVal.Value;
if (!scaleValue.Equals(0))
{
gr.RotateTransform((float)scaleValue);
}
}
else
{
double angle;
switch (markerPos)
{
case SvgMarkerPosition.Start:
angle = markerHostElm.GetStartAngle(i);
//angle = markerHostElm.GetStartAngle(i + 1);
if (vertexPositions.Length >= 2)
{
SvgPointF pMarkerPoint1 = vertexPositions[start];
SvgPointF pMarkerPoint2 = vertexPositions[end];
float xDiff = pMarkerPoint2.X - pMarkerPoint1.X;
float yDiff = pMarkerPoint2.Y - pMarkerPoint1.Y;
double angleMarker = (float)(Math.Atan2(yDiff, xDiff) * 180.0 / Math.PI);
if (!angleMarker.Equals(angle))
{
angle = angleMarker;
}
}
break;
case SvgMarkerPosition.Mid:
//angle = (markerHostElm.GetEndAngle(i) + markerHostElm.GetStartAngle(i + 1)) / 2;
angle = SvgNumber.CalcAngleBisection(markerHostElm.GetEndAngle(i), markerHostElm.GetStartAngle(i + 1));
break;
default:
angle = markerHostElm.GetEndAngle(i - 1);
//double angle2 = markerHostElm.GetEndAngle(i);
if (vertexPositions.Length >= 2)
{
SvgPointF pMarkerPoint1 = vertexPositions[start - 1];
SvgPointF pMarkerPoint2 = vertexPositions[start];
float xDiff = pMarkerPoint2.X - pMarkerPoint1.X;
float yDiff = pMarkerPoint2.Y - pMarkerPoint1.Y;
double angleMarker = (float)(Math.Atan2(yDiff, xDiff) * 180.0 / Math.PI);
if (!angleMarker.Equals(angle))
{
angle = angleMarker;
}
}
//if (mayHaveCurves)
//{
// angle = this.GetAngleAt(start - 1, angle, markerPos, markerHostElm);
//}
break;
}
gr.RotateTransform((float)angle);
}
// 'viewBox' and 'preserveAspectRatio' attributes
// viewBox -> viewport(0, 0, markerWidth, markerHeight)
var spar = (SvgPreserveAspectRatio)markerElm.PreserveAspectRatio.AnimVal;
double[] translateAndScale = spar.FitToViewBox((SvgRect)markerElm.ViewBox.AnimVal,
new SvgRect(0, 0, markerElm.MarkerWidth.AnimVal.Value, markerElm.MarkerHeight.AnimVal.Value));
//// Warning at this time, refX and refY are relative to the painted element's coordinate system.
//// We need to move the reference point to the marker's coordinate system
//float refX = (float)markerElm.RefX.AnimVal.Value;
//float refY = (float)markerElm.RefY.AnimVal.Value;
////if (!(refX.Equals(0) && refY.Equals(0)))
////{
//// var points = new PointF[] { new PointF(refX, refY) };
//// gr.Transform.TransformPoints(points);
//// refX = points[0].X;
//// refY = points[0].Y;
//// gr.TranslateTransform(-refX, -refY);
////}
//if (markerElm.MarkerUnits.AnimVal.Equals((ushort)SvgMarkerUnit.StrokeWidth))
//{
// SvgLength strokeWidthLength = new SvgLength(refElement,
// "stroke-width", SvgLengthSource.Css, SvgLengthDirection.Viewport, "1");
// float strokeWidth = (float)strokeWidthLength.Value;
// gr.ScaleTransform(strokeWidth, strokeWidth);
//}
//gr.TranslateTransform(-(float)(markerElm.RefX.AnimVal.Value * translateAndScale[2]),
// -(float)(markerElm.RefY.AnimVal.Value * translateAndScale[3]));
//gr.ScaleTransform((float)translateAndScale[2], (float)translateAndScale[3]);
// compute an additional transform for 'strokeWidth' coordinate system
ISvgAnimatedEnumeration markerUnits = markerElm.MarkerUnits;
if (markerUnits.AnimVal.Equals((ushort)SvgMarkerUnit.StrokeWidth))
{
SvgLength strokeWidthLength = new SvgLength(refElement,
"stroke-width", SvgLengthSource.Css, SvgLengthDirection.Viewport, SvgConstants.ValOne);
double strokeWidth = strokeWidthLength.Value;
if (!strokeWidth.Equals(1))
{
gr.ScaleTransform((float)strokeWidth, (float)strokeWidth);
}
}
gr.TranslateTransform(-(float)(markerElm.RefX.AnimVal.Value * translateAndScale[2]),
-(float)(markerElm.RefY.AnimVal.Value * translateAndScale[3]));
if (!(translateAndScale[2].Equals(1) && translateAndScale[3].Equals(1)))
{
gr.ScaleTransform((float)translateAndScale[2], (float)translateAndScale[3]);
}
// gr.TranslateTransform(point.X, point.Y);
RectangleF rectClip = RectangleF.Empty;
if (markerUnits.AnimVal.Equals((ushort)SvgMarkerUnit.StrokeWidth))
{
string overflowAttr = markerElm.GetAttribute("overflow");
if (string.IsNullOrWhiteSpace(overflowAttr) ||
overflowAttr.Equals("scroll", comparer) || overflowAttr.Equals(CssConstants.ValHidden, comparer))
{
var markerClip = RectangleF.Empty;
SvgRect clipRect = (SvgRect)markerElm.ViewBox.AnimVal;
if (clipRect != null && !clipRect.IsEmpty)
{
rectClip = new RectangleF((float)clipRect.X, (float)clipRect.Y,
(float)clipRect.Width, (float)clipRect.Height);
}
else if (markerElm.IsSizeDefined)
{
rectClip = new RectangleF(0, 0,
(float)markerElm.MarkerWidth.AnimVal.Value, (float)markerElm.MarkerHeight.AnimVal.Value);
}
}
}
if (rectClip.IsEmpty)
{
SetClip(gr);
}
else
{
gr.SetClip(rectClip);
}
renderer.RenderChildren(markerElm);
gr.EndContainer(gc);
}
}
protected void SetClip(GdiGraphics graphics)
{
if (_svgElement == null)
{
return;
}
SvgRenderingHint hint = _svgElement.RenderingHint;
// todo: should we correct the clipping to adjust to the off-one-pixel drawing?
graphics.TranslateClip(1, 1);
#region Clip with clip
// see http://www.w3.org/TR/SVG/masking.html#OverflowAndClipProperties
if (_svgElement is ISvgSvgElement || _svgElement is ISvgMarkerElement ||
_svgElement is ISvgSymbolElement || _svgElement is ISvgPatternElement)
{
// check overflow property
CssValue overflow = _svgElement.GetComputedCssValue("overflow", string.Empty) as CssValue;
// TODO: clip can have "rect(10 10 auto 10)"
CssPrimitiveValue clip = _svgElement.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 (_svgElement is ISvgSvgElement)
{
ISvgSvgElement svgElement = (ISvgSvgElement)_svgElement;
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 (_svgElement is ISvgSvgElement)
{
ISvgSvgElement svgElement = (ISvgSvgElement)_svgElement;
SvgRect viewPort = svgElement.Viewport as SvgRect;
clipRect = GdiConverter.ToRectangle(viewPort);
}
else if (_svgElement is ISvgMarkerElement || _svgElement is ISvgSymbolElement ||
_svgElement is ISvgPatternElement)
{
// TODO: what to do here?
}
}
if (clipRect != RectangleF.Empty)
{
graphics.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 || hint == SvgRenderingHint.Image)
{
CssPrimitiveValue clipPath = _svgElement.GetComputedCssValue("clip-path", string.Empty) as CssPrimitiveValue;
if (clipPath != null && clipPath.PrimitiveType == CssPrimitiveType.Uri)
{
string absoluteUri = _svgElement.ResolveUri(clipPath.GetStringValue());
SvgClipPathElement eClipPath = _svgElement.OwnerDocument.GetNodeByUri(absoluteUri) as SvgClipPathElement;
if (eClipPath != null)
{
GraphicsPath gpClip = CreateClippingRegion(graphics, eClipPath);
RectangleF clipBounds = gpClip != null?gpClip.GetBounds() : RectangleF.Empty;
if (clipBounds.Width.Equals(0) || clipBounds.Height.Equals(0))
{
return;
}
SvgUnitType pathUnits = (SvgUnitType)eClipPath.ClipPathUnits.AnimVal;
if (pathUnits == SvgUnitType.ObjectBoundingBox)
{
SvgTransformableElement transElement = _svgElement 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);
graphics.SetClip(gpClip);
// offset clip
graphics.TranslateClip((float)bbox.X, (float)bbox.Y);
}
else
{
throw new NotImplementedException("clip-path with SvgUnitType.ObjectBoundingBox "
+ "not supported for this type of element: " + _svgElement.GetType());
}
}
else
{
graphics.SetClip(gpClip);
}
gpClip.Dispose();
gpClip = null;
}
}
}
#endregion
}
private void AddGraphicsPath(SvgTextContentElement element, ref PointF ctp, string text)
{
if (text.Length == 0)
{
return;
}
float emSize = GetComputedFontSize(element);
FontFamily family = GetFontFamily(element);
int style = GetFontStyle(element);
StringFormat sf = GetStringFormat(element);
GraphicsPath textGeometry = new GraphicsPath();
float xCorrection = 0;
if (sf.Alignment == StringAlignment.Near)
{
xCorrection = emSize * 1 / 6;
}
else if (sf.Alignment == StringAlignment.Far)
{
xCorrection = -emSize * 1 / 6;
}
float yCorrection = (float)(family.GetCellAscent(FontStyle.Regular)) / (float)(family.GetEmHeight(FontStyle.Regular)) * emSize;
// TODO: font property
PointF p = new PointF(ctp.X - xCorrection, ctp.Y - yCorrection);
textGeometry.AddString(text, family, style, emSize, p, sf);
if (!textGeometry.GetBounds().IsEmpty)
{
float bboxWidth = textGeometry.GetBounds().Width;
if (sf.Alignment == StringAlignment.Center)
{
bboxWidth /= 2;
}
else if (sf.Alignment == StringAlignment.Far)
{
bboxWidth = 0;
}
ctp.X += bboxWidth + emSize / 4;
}
if (_textMode == GdiTextMode.Outlining)
{
_graphicsPath.AddPath(textGeometry, false);
return;
}
GdiSvgPaint fillPaint = new GdiSvgPaint(element, "fill");
Brush brush = fillPaint.GetBrush(textGeometry);
GdiSvgPaint strokePaint = new GdiSvgPaint(element, "stroke");
Pen pen = strokePaint.GetPen(textGeometry);
if (brush != null)
{
if (brush is PathGradientBrush)
{
var gps = fillPaint.PaintFill as GdiRadialGradientFill;
_graphics.SetClip(gps.GetRadialRegion(textGeometry.GetBounds()), CombineMode.Exclude);
SolidBrush tempBrush = new SolidBrush(((PathGradientBrush)brush).InterpolationColors.Colors[0]);
_graphics.FillPath(this, tempBrush, textGeometry);
tempBrush.Dispose();
_graphics.ResetClip();
}
_graphics.FillPath(this, brush, textGeometry);
brush.Dispose();
}
if (pen != null)
{
if (pen.Brush is PathGradientBrush)
{
var gps = strokePaint.PaintFill as GdiRadialGradientFill;
GdiGraphicsContainer container = _graphics.BeginContainer();
_graphics.SetClip(gps.GetRadialRegion(textGeometry.GetBounds()), CombineMode.Exclude);
SolidBrush tempBrush = new SolidBrush(((PathGradientBrush)pen.Brush).InterpolationColors.Colors[0]);
Pen tempPen = new Pen(tempBrush, pen.Width);
_graphics.DrawPath(this, tempPen, textGeometry);
tempPen.Dispose();
tempBrush.Dispose();
_graphics.EndContainer(container);
}
_graphics.DrawPath(this, pen, textGeometry);
pen.Dispose();
}
textGeometry.Dispose();
}