IEnumerable <object> IPickingAdapter.Pick(Region region)
{
if (m_annotatedDiagram == null)
{
return(EmptyEnumerable <object> .Instance);
}
List <object> hit = new List <object>();
RectangleF bounds;
using (Graphics g = AdaptedControl.CreateGraphics())
bounds = region.GetBounds(g);
if (m_transformAdapter != null)
{
bounds = GdiUtil.InverseTransform(m_transformAdapter.Transform, bounds);
}
foreach (IAnnotation annotation in m_annotatedDiagram.Annotations)
{
Rectangle annotationBounds = GetBounds(annotation);
if (bounds.IntersectsWith(annotationBounds))
{
hit.Add(annotation);
}
}
return(hit);
}
/// <summary>
/// Gets the bounding rectangle of the nodes in client coordinates</summary>
/// <param name="nodes">Graph nodes</param>
/// <returns>Bounding rectangle of nodes</returns>
public Rectangle GetBounds(IEnumerable <TNode> nodes)
{
Rectangle bounds;
using (Graphics g = AdaptedControl.CreateGraphics())
{
g.Transform = m_transformAdapter.Transform;
bounds = m_renderer.GetBounds(nodes, g);
}
return(bounds);
}
/// <summary>
/// Performs a picking operation and returns enumeration of Nodes intersecting the region</summary>
/// <param name="pickRegion">Hit test region</param>
/// <typeparam name="T">Type of objects intersecting pick region</typeparam>
/// <returns>Objects of type T intersecting the pick region</returns>
/// <remarks>The default implementation only returns intersecting Nodes, but derived
/// classes can override this method to return Edges or EdgeRoutes as well.</remarks>
public virtual IEnumerable <T> Pick <T>(Region pickRegion) where T : class
{
List <TNode> pickedGraphNodes = new List <TNode>();
using (Graphics g = AdaptedControl.CreateGraphics())
{
RectangleF pickRect = pickRegion.GetBounds(g);
pickRect = GdiUtil.InverseTransform(m_transformAdapter.Transform, pickRect);
foreach (TNode node in m_graph.Nodes)
{
RectangleF nodeBounds = m_renderer.GetBounds(node, g);
if (nodeBounds.IntersectsWith(pickRect))
{
pickedGraphNodes.Add(node);
}
}
}
return(pickedGraphNodes.AsIEnumerable <T>());
}
/// <summary>
/// Performs a picking operation on the graph with the point</summary>
/// <param name="p">Hit test point</param>
/// <returns>Hit record resulting from picking operation</returns>
public GraphHitRecord <TNode, TEdge, TEdgeRoute> Pick(Point p)
{
// use cache to speed up multiple pick requests at the same point
if (m_cachedHitRecord == null || p != m_cachedHitPoint)
{
m_cachedHitPoint = p;
TEdge priorityEdge = null;
if (m_selectionContext != null)
{
priorityEdge = m_selectionContext.GetLastSelected <TEdge>();
}
p = GdiUtil.InverseTransform(m_transformAdapter.Transform, p);
using (Graphics g = AdaptedControl.CreateGraphics())
{
m_cachedHitRecord = m_renderer.Pick(m_graph, priorityEdge, p, g);
}
}
return(m_cachedHitRecord);
}
