//*************************************************************************
// 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_oBackColor = SystemColors.WindowColor;
// Forward the events fired by the vertex and edge drawers.
m_oVertexDrawer.RedrawRequired +=
delegate { this.FireRedrawRequired(); };
m_oVertexDrawer.LayoutRequired +=
delegate { this.FireLayoutRequired(); };
m_oEdgeDrawer.RedrawRequired +=
delegate { this.FireRedrawRequired(); };
m_oEdgeDrawer.LayoutRequired +=
delegate { this.FireLayoutRequired(); };
AssertValid();
}
//*************************************************************************
// Method: CreateVisual()
//
/// <summary>
/// Creates the Visual that should be used to represent the dragged
/// vertices.
/// </summary>
///
/// <param name="currentMouseLocation">
/// The current mouse location.
/// </param>
///
/// <param name="backColor">
/// The graph's background color.
/// </param>
///
/// <param name="vertexDrawer">
/// The VertexDrawer that should be used to draw the dragged vertices.
/// </param>
///
/// <returns>
/// The Visual that should be used to represent the dragged vertices.
/// </returns>
///
/// <remarks>
/// The returned Visual can be retrieved later via the <see
/// cref="MouseDragWithVisual.Visual" /> property.
/// </remarks>
//*************************************************************************
public Visual 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);
}
