//--------------------------------------------------------------------------------------------------
#endregion
#region Paths
protected void InitPathExport()
{
CurrentPath = new SvgPathElement();
_PathStart = new Pnt2d();
_PathPosition = new Pnt2d();
_SubPathStartIndex = 0;
}
//--------------------------------------------------------------------------------------------------
protected SvgPathElement FinalizePath()
{
ClosePath();
SvgPathElement path = CurrentPath;
if (path?.Segments.Count > 0)
{
CurrentGroup.Children.Add(path);
}
CurrentPath = null;
return(path);
}
//--------------------------------------------------------------------------------------------------
void _ImportPath(SvgPathElement path)
{
if (path.Segments.Count < 1)
{
return;
}
int startPoint = -1;
int firstPoint = -1;
foreach (var pathSegment in path.Segments)
{
switch (pathSegment)
{
case SvgPathSegMoveto moveToSegment:
startPoint = _AddPoint(pathSegment.Start);
if (firstPoint == -1)
{
firstPoint = startPoint;
}
break;
case SvgPathSegLineto lineSegment:
_ImportLineSegment(lineSegment, ref startPoint);
break;
case SvgPathSegClosePath closePathSegment:
_ImportClosePathSegment(closePathSegment, ref startPoint, ref firstPoint);
break;
case SvgPathSegArc arcSegment:
_ImportArcSegment(arcSegment, ref startPoint);
break;
case SvgPathSegCurvetoCubic cubicCurveSegment:
_ImportCubicCurveSegment(cubicCurveSegment, ref startPoint);
break;
case SvgPathSegCurvetoQuadratic quadraticCurveSegment:
_ImportQuadraticCurveSegment(quadraticCurveSegment, ref startPoint);
break;
default:
var endPoint = _AddPoint(pathSegment.End);
startPoint = endPoint;
Messages.Warning("Imported SVG shape does have an unsupported path segment type " + pathSegment.GetType().Name + ". [ " + path.ID + " ]");
break;
}
}
}
//--------------------------------------------------------------------------------------------------
protected void ClosePath()
{
SvgPathElement path = CurrentPath;
if (path?.Segments.Count > 0)
{
if (_PathPosition != Pnt2d.Origin && _AreEqual(_PathStart, _PathPosition))
{
path.Segments.Add(new SvgPathSegClosePath());
}
}
_PathPosition = new Pnt2d();
_PathStart = new Pnt2d();
}
internal virtual bool Read(XmlReader reader, SvgConverter conv)
{
var transformString = reader.GetAttribute("transform");
if (!transformString.IsNullOrEmpty())
{
Transforms.AddRange(SvgTransform.Create(transformString, conv));
}
conv.PushTransform(Transforms);
var depth = reader.Depth;
reader.Read();
while (!reader.EOF && reader.Depth > depth)
{
if (reader.NodeType != XmlNodeType.Element)
{
reader.Read();
continue;
}
SvgElement newElement = null;
switch (reader.LocalName.ToLower())
{
case "g":
newElement = new SvgGroupElement();
break;
case "circle":
newElement = new SvgCircleElement();
break;
case "ellipse":
newElement = new SvgEllipseElement();
break;
case "path":
newElement = new SvgPathElement();
break;
case "line":
newElement = new SvgLineElement();
break;
case "rect":
newElement = new SvgRectElement();
break;
}
if (newElement != null)
{
if (newElement.Read(reader, conv))
{
Children.Add(newElement);
}
}
else
{
reader.Skip();
}
}
return(true);
}
//--------------------------------------------------------------------------------------------------
MemoryStream _Export()
{
_Group = new SvgGroupElement
{
ID = _Sketch.Name,
Style = new SvgStyle {
StrokeWidth = 0.1f, StrokeColor = Color.Black, FillColor = null
}
};
var freeSegments = new Dictionary <int, SketchSegment>(_Sketch.Segments);
while (freeSegments.Any())
{
var currentSegmentKvp = freeSegments.First();
freeSegments.Remove(currentSegmentKvp.Key);
var currentSegment = currentSegmentKvp.Value;
if ((currentSegment.StartPoint == -1) || (currentSegment.EndPoint == -1))
{
// Unconnected segment
_AddUnconnectableSegment(currentSegment);
continue;
}
// Start path
_CurrentPath = new SvgPathElement();
_FirstPathEndPoint = -1;
_LastPathEndPoint = -1;
// search for connected
while (freeSegments.Any())
{
currentSegmentKvp = freeSegments.FirstOrDefault(kvp => kvp.Value.IsConnected(currentSegment));
if (currentSegmentKvp.Value == null)
{
// disconnected segment
break;
}
if (_FirstPathEndPoint == -1)
{
// First connection, get winding order and write the move to start position
if ((currentSegment.EndPoint == currentSegmentKvp.Value.StartPoint) ||
(currentSegment.EndPoint == currentSegmentKvp.Value.EndPoint))
{
var startPoint = _Sketch.Points[currentSegment.StartPoint];
_CurrentPath.Segments.Add(new SvgPathSegMoveto(startPoint));
_LastPathEndPoint = currentSegment.StartPoint;
_FirstPathEndPoint = currentSegment.StartPoint;
}
else
{
var startPoint = _Sketch.Points[currentSegment.EndPoint];
_CurrentPath.Segments.Add(new SvgPathSegMoveto(startPoint));
_LastPathEndPoint = currentSegment.EndPoint;
_FirstPathEndPoint = currentSegment.EndPoint;
}
// add first element
if (!_AddPathSegment(currentSegment))
{
break;
}
}
// Next connected, write
currentSegment = currentSegmentKvp.Value;
freeSegments.Remove(currentSegmentKvp.Key);
if (!_AddPathSegment(currentSegment))
{
break;
}
}
if (_LastPathEndPoint == -1)
{
// Standalone element, write as single segment
var startPoint = _Sketch.Points[currentSegment.StartPoint];
_CurrentPath.Segments.Add(new SvgPathSegMoveto(startPoint));
_AddPathSegment(currentSegment);
}
// Close segment, if needed
if (_FirstPathEndPoint == _LastPathEndPoint)
{
_CurrentPath.Segments.Add(new SvgPathSegClosePath());
}
// Add to group
_Group.Children.Add(_CurrentPath);
}
var doc = new SvgDocument
{
Width = 100,
Height = 100,
DotsPerInch = DotsPerInch
};
doc.Children.Add(_Group);
return(doc.WriteToStream());
}
