VgVisualElement CreatePolyline(VgVisualElement parentNode, SvgPolylineSpec polylineSpec)
{
VgVisualElement vgPolyline = new VgVisualElement(WellknownSvgElementName.Polyline, polylineSpec, _vgVisualDoc);
PointF[] points = polylineSpec.Points;
int j = points.Length;
if (j > 1)
{
using (Tools.BorrowVxs(out var v1))
{
PointF p = points[0];
v1.AddMoveTo(p.X, p.Y);
for (int i = 1; i < j; ++i)
{
p = points[i];
v1.AddLineTo(p.X, p.Y);
}
vgPolyline.VxsPath = v1.CreateTrim();
}
AssignAttributes(polylineSpec);
//--------------------------------------------------------------------
ResolveMarkers(vgPolyline, polylineSpec);
if (vgPolyline._pathMarkers != null)
{
//create primary instance plan for this polyline
VgPathVisualMarkers pathMarkers = vgPolyline._pathMarkers;
pathMarkers.AllPoints = points;
//start, mid, end
if (pathMarkers.StartMarker != null)
{
//turn marker to the start direction
PointF p0 = points[0];
PointF p1 = points[1];
//find rotation angle
double rotateRad = Math.Atan2(p0.Y - p1.Y, p0.X - p1.X);
SvgMarkerSpec markerSpec = (SvgMarkerSpec)pathMarkers.StartMarker._visualSpec;
//create local-transformation matrix
pathMarkers.StartMarkerPos = new PointF(p0.X, p0.Y);
AffineMat mat = AffineMat.Iden();
mat.Translate(-markerSpec.RefX.Number, -markerSpec.RefY.Number); //move to the ref point
mat.Rotate(rotateRad);
pathMarkers.StartMarkerAffine = new Affine(mat);
}
//-------------------------------
if (pathMarkers.MidMarker != null)
{
SvgMarkerSpec markerSpec = (SvgMarkerSpec)pathMarkers.StartMarker._visualSpec;
pathMarkers.MidMarkerAffine = Affine.NewTranslation(-markerSpec.RefX.Number, -markerSpec.RefY.Number);
}
//-------------------------------
if (pathMarkers.EndMarker != null)
{
//turn marker to the start direction
PointF p0 = points[j - 2]; //before the last one
PointF p1 = points[j - 1]; //the last one
//find rotation angle
double rotateRad = Math.Atan2(p1.Y - p0.Y, p1.X - p0.X);
SvgMarkerSpec markerSpec = (SvgMarkerSpec)pathMarkers.EndMarker._visualSpec;
//create local-transformation matrix
pathMarkers.EndMarkerPos = new PointF(p1.X, p1.Y);
AffineMat mat = AffineMat.Iden();
mat.Translate(-markerSpec.RefX.Number, -markerSpec.RefY.Number); //move to the ref point
mat.Rotate(rotateRad);
pathMarkers.EndMarkerAffine = new Affine(mat);
}
}
}
return(vgPolyline);
}