protected override VisualGroup UpdateVisual(IRenderContext context, VisualGroup faces, INode node)
{
// create faces
var nodeData = (NodeData)node.Tag;
var height = nodeData.Geometry.Height;
var layout = node.Layout;
var oldCache = faces.GetRenderDataCache <NodeRenderData>();
var newCache = new NodeRenderData(layout.X, layout.Y, layout.Width, layout.Height, height, nodeData.Color, context.Projection);
if (!newCache.Equals(oldCache))
{
faces.SetRenderDataCache(newCache);
var corners = CalculateCorners(context.Projection, layout.X, layout.Y, layout.Width, layout.Height, height);
SolidColorBrush topBrush = null;
SolidColorBrush leftBrush = null;
SolidColorBrush rightBrush = null;
var pen = nodeData.Pen;
var brush = nodeData.Brush;
if (brush != null)
{
topBrush = brush;
if (height > 0)
{
leftBrush = Darker(brush);
rightBrush = Darker(leftBrush);
}
}
if (height == 0 && faces.Children.Count > 1)
{
while (faces.Children.Count > 1)
{
faces.Children.RemoveAt(faces.Children.Count - 1);
}
}
else if (height > 0)
{
// check which of the left, right, back and front faces are visible using the current projection
var upVector = CalculateHeightVector(context.Projection);
var useLeft = upVector.X > 0;
var useBack = upVector.Y > 0;
var leftFacePath = useLeft ? GetLeftFacePath(corners) : GetRightFacePath(corners);
var rightFacePath = useBack ? GetBackFacePath(corners) : GetFrontFacePath(corners);
if (faces.Children.Count == 1)
{
var faceLeft = leftFacePath.CreatePath(leftBrush, pen, null, FillMode.Always);
faces.Children.Insert(0, faceLeft);
var faceRight = rightFacePath.CreatePath(rightBrush, pen, null, FillMode.Always);
faces.Children.Insert(1, faceRight);
}
else
{
var faceLeft = faces.Children[0] as Path;
leftFacePath.UpdatePath(faceLeft, leftBrush, pen, null, FillMode.Always);
var faceRight = faces.Children[1] as Path;
rightFacePath.UpdatePath(faceRight, rightBrush, pen, null, FillMode.Always);
}
}
var topFacePath = GetTopFacePath(corners);
var faceTop = faces.Children.Last() as Path;
topFacePath.UpdatePath(faceTop, topBrush, pen, null, FillMode.Always);
}
return(faces);
}
private bool Equals(NodeRenderData other)
{
return(other.X == X && other.Y == Y && other.Width == Width && other.Height == Height &&
other.Depth == Depth && other.Color == Color && other.Projection == Projection);
}
