//*************************************************************************
// Constructor: GraphDrawer()
//
/// <summary>
/// Initializes a new instance of the <see cref="GraphDrawer" /> class.
/// </summary>
///
/// <param name="parentVisual">
/// The parent of the contained <see
/// cref="GraphDrawer.VisualCollection" />. This is usually a
/// FrameworkElement that is hosting the collection.
/// </param>
//*************************************************************************
public GraphDrawer
(
Visual parentVisual
)
{
Debug.Assert(parentVisual != null);
m_oVisualCollection = new VisualCollection(parentVisual);
m_oAllVertexDrawingVisuals = null;
m_oUnselectedEdgeDrawingVisuals = null;
m_oSelectedEdgeDrawingVisuals = null;
m_oVertexDrawer = new VertexDrawer();
m_oEdgeDrawer = new EdgeDrawer();
m_oGroupDrawer = new GroupDrawer();
m_oBackColor = SystemColors.WindowColor;
m_oBackgroundImage = null;
AssertValid();
}
CreateVisual
(
Point currentMouseLocation,
Color backColor,
VertexDrawer vertexDrawer
)
{
Debug.Assert(vertexDrawer != null);
Debug.Assert(m_bDragIsInProgress);
AssertValid();
// This method redraws the dragged vertices at an offset location, and
// adds the resulting Visuals to a ContainerVisual.
//
// Figure out the offset.
Double dOffsetX = currentMouseLocation.X - m_oMouseDownLocation.X;
Double dOffsetY = currentMouseLocation.Y - m_oMouseDownLocation.Y;
GraphDrawingContext oGraphDrawingContext = new GraphDrawingContext(
m_oGraphRectangle, m_iMargin, backColor);
ContainerVisual oContainerVisual = new ContainerVisual();
foreach (IVertex oVertex in m_aoVertices)
{
System.Drawing.PointF oOriginalLocation =
GetOriginalVertexLocation(oVertex);
oVertex.Location = new System.Drawing.PointF(
oOriginalLocation.X + (Single)dOffsetX,
oOriginalLocation.Y + (Single)dOffsetY
);
VertexDrawingHistory oVertexDrawingHistory;
if ( vertexDrawer.TryDrawVertex(oVertex, oGraphDrawingContext,
out oVertexDrawingHistory) )
{
oContainerVisual.Children.Add(
oVertexDrawingHistory.DrawingVisual);
}
}
m_oVisual = oContainerVisual;
return (m_oVisual);
}