protected override IList <object> Pick(MouseEventArgs e)
{
bool multiSelect = DragOverThreshold;
List <object> paths = new List <object>();
HitRecord[] hits;
if (multiSelect)
{// frustum pick
RectangleF rect = MakeRect(FirstMousePoint, CurrentMousePoint);
hits = GameEngine.FrustumPick(SurfaceId, Camera.ViewMatrix, Camera.ProjectionMatrix, rect);
}
else
{// ray pick
Ray3F rayW = GetWorldRay(CurrentMousePoint);
hits = GameEngine.RayPick(Camera.ViewMatrix, Camera.ProjectionMatrix, rayW, false);
}
// create unique list of hits
HashSet <ulong> instanceSet = new HashSet <ulong>();
List <HitRecord> uniqueHits = new List <HitRecord>();
// build 'path' objects for each hit record.
foreach (HitRecord hit in hits)
{
bool added = instanceSet.Add(hit.instanceId);
if (added)
{
uniqueHits.Add(hit);
}
}
HitRecord firstHit = new HitRecord();
// build 'path' objects for each hit record.
foreach (HitRecord hit in uniqueHits)
{
NativeObjectAdapter nobj = GameEngine.GetAdapterFromId(hit.instanceId);
DomNode dom = nobj.DomNode;
object hitPath = Util.AdaptDomPath(dom);
object obj = DesignView.PickFilter.Filter(hitPath, e);
if (obj != null)
{
if (paths.Count == 0)
{
firstHit = hit;
}
var newPath = obj as AdaptablePath <object> ?? Util.AdaptDomPath((DomNode)obj);
paths.Add(newPath);
}
}
if (multiSelect == false && paths.Count > 0)
{
var path = paths[0];
ISelectionContext selection = DesignView.Context.As <ISelectionContext>();
ILinear linear = path.As <ILinear>();
if (linear != null &&
Control.ModifierKeys == System.Windows.Forms.Keys.Shift &&
selection.SelectionContains(path))
{
ITransactionContext trans = DesignView.Context.As <ITransactionContext>();
trans.DoTransaction(
delegate
{
linear.InsertPoint(firstHit.index, firstHit.hitPt.X, firstHit.hitPt.Y, firstHit.hitPt.Z);
}, "insert control point".Localize()
);
}
}
return(paths);
}