// walk the visual tree of adornment elements
private void RenderHandles(FrameworkElement elt)
{
if (elt == null)
{
return;
}
Path path = elt as Path;
if (path != null) // if it's a Path
// and if NodePanel.Figure is specified and is None, it's a SelectionHandle equivalent
{
NodeFigure fig = NodePanel.GetFigure(elt);
if (fig == NodeFigure.None) // must explicitly set go:NodePanel.Figure="None", to distinguish this selection handle from random Path shapes
{
Shape adornedshape = this.AdornedElement as Shape; // hack: because GetSelectionGeometry doesn't always return a Geometry of the AdornedElement's size
if (adornedshape != null && this.AdornedPart is Node &&
((adornedshape is Path && NodePanel.GetFigure(adornedshape) != NodeFigure.None) || // when that Path is a NodeShape equivalent
adornedshape is Polygon || adornedshape is Polyline)) // or is a Polygon or Polyline
{
path.Stretch = Stretch.Fill;
Size sz = GetEffectiveSize(adornedshape); // can't just use ActualWidth/Height, because measuring has reset them to zero
path.Width = sz.Width;
path.Height = sz.Height;
}
path.Data = GetSelectionGeometry(path, this);
}
else // otherwise assume it's a ToolHandle equivalent
{
if (path.Data == null)
{
path.Stretch = Stretch.Fill;
path.Data = GetFigureGeometry(path); // returns a Geometry with points from 0,0 to 1,1
}
}
}
else
{
int count = VisualTreeHelper.GetChildrenCount(elt);
for (int i = 0; i < count; i++)
{
RenderHandles(VisualTreeHelper.GetChild(elt, i) as FrameworkElement);
}
}
}
private void RenderNodeShape(UIElement elt, Size sz)
{
if (elt == null)
{
return;
}
Path path = elt as Path;
if (path != null) // if it's a Path
// and if NodePanel.Figure is specified, it's a NodeShape equivalent
{
NodeFigure fig = NodePanel.GetFigure(elt);
if (fig != NodeFigure.None)
{
path.Stretch = Stretch.Fill;
path.Data = new NodeGeometry(path).GetGeometry(sz);
// this also has the side-effect of setting any default Spot1/Spot2 parameters
}
}
}
// return a Geometry that is unscaled (all points are from 0,0 to 1,1)
//?? need to use NodeShape some day; promote this stuff to NodePanel also, to implement NodeShape equivalent
internal static Geometry GetFigureGeometry(Shape elt)
{
switch (NodePanel.GetFigure(elt))
{
default:
case NodeFigure.Rectangle:
Geometry
_RectangleFigure = new RectangleGeometry()
{
Rect = new Rect(0, 0, 1, 1)
};
return(_RectangleFigure);
case NodeFigure.Ellipse:
Geometry
_EllipseFigure = new EllipseGeometry()
{
Center = new Point(0.5, 0.5),
RadiusX = 0.5,
RadiusY = 0.5
};
return(_EllipseFigure);
case NodeFigure.Diamond:
Geometry
_DiamondFigure = new PathGeometry()
{
Figures = new PathFigureCollection()
{
new PathFigure()
{
StartPoint = new Point(0.5, 0),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(1, 0.5)
},
new LineSegment()
{
Point = new Point(0.5, 1)
},
new LineSegment()
{
Point = new Point(0, 0.5)
}
},
IsClosed = true
}
}
};
return(_DiamondFigure);
case NodeFigure.TriangleRight:
Geometry
_TriangleRightFigure = new PathGeometry()
{
Figures = new PathFigureCollection()
{
new PathFigure()
{
StartPoint = new Point(0, 0),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(1, 0.5)
},
new LineSegment()
{
Point = new Point(0, 1)
}
},
IsClosed = true
}
}
};
return(_TriangleRightFigure);
case NodeFigure.TriangleDown:
Geometry
_TriangleDownFigure = new PathGeometry()
{
Figures = new PathFigureCollection()
{
new PathFigure()
{
StartPoint = new Point(0, 0),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(1, 0)
},
new LineSegment()
{
Point = new Point(0.5, 1)
}
},
IsClosed = true
}
}
};
return(_TriangleDownFigure);
case NodeFigure.TriangleLeft:
Geometry
_TriangleLeftFigure = new PathGeometry()
{
Figures = new PathFigureCollection()
{
new PathFigure()
{
StartPoint = new Point(1, 1),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(0, 0.5)
},
new LineSegment()
{
Point = new Point(1, 0)
}
},
IsClosed = true
}
}
};
return(_TriangleLeftFigure);
case NodeFigure.TriangleUp:
Geometry
_TriangleUpFigure = new PathGeometry()
{
Figures = new PathFigureCollection()
{
new PathFigure()
{
StartPoint = new Point(1, 1),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(0, 1)
},
new LineSegment()
{
Point = new Point(0.5, 0)
}
},
IsClosed = true
}
}
};
return(_TriangleUpFigure);
case NodeFigure.PlusLine:
Geometry
_PlusLineFigure = new PathGeometry()
{
Figures = new PathFigureCollection()
{
new PathFigure()
{
StartPoint = new Point(0.5, 0),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(0.5, 1)
}
},
IsClosed = false
},
new PathFigure()
{
StartPoint = new Point(0, 0.5),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(1, 0.5)
}
},
IsClosed = false
}
}
};
return(_PlusLineFigure);
case NodeFigure.XLine:
Geometry
_XLineFigure = new PathGeometry()
{
Figures = new PathFigureCollection()
{
new PathFigure()
{
StartPoint = new Point(0, 0),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(1, 1)
}
},
IsClosed = false
},
new PathFigure()
{
StartPoint = new Point(1, 0),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(0, 1)
}
},
IsClosed = false
}
}
};
return(_XLineFigure);
case NodeFigure.AsteriskLine:
Geometry
_AsteriskLineFigure = new PathGeometry()
{
Figures = new PathFigureCollection()
{
new PathFigure()
{
StartPoint = new Point(0.5, 0),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(0.5, 1)
}
},
IsClosed = false
},
new PathFigure()
{
StartPoint = new Point(0, 0.5),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(1, 0.5)
}
},
IsClosed = false
},
new PathFigure()
{
StartPoint = new Point(0, 0),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(1, 1)
}
},
IsClosed = false
},
new PathFigure()
{
StartPoint = new Point(1, 0),
Segments = new PathSegmentCollection()
{
new LineSegment()
{
Point = new Point(0, 1)
}
},
IsClosed = false
}
}
};
return(_AsteriskLineFigure);
}
}