private TopologyDropTargetCourseObj FindNearbyDropTarget(PointF location)
{
const float MAXDISTANCE = 9F;
const float MINDRAGDIST = 5F;
CourseLayout layout = selectionMgr.TopologyLayout;
TopologyDropTargetCourseObj nearest = null;
Id <CourseControl> courseControlDrag = courseObjectDrag.courseControlId;
float nearestDistance = float.MaxValue;
// Find nearest drop target that is within MAXDISTANCE of location, and not adjacent to the
// course control we are dragging.
foreach (CourseObj obj in layout)
{
TopologyDropTargetCourseObj dropTarget = obj as TopologyDropTargetCourseObj;
if (dropTarget != null &&
((dropTarget.courseControlId != courseControlDrag && dropTarget.courseControlId2 != courseControlDrag) ||
courseObjectStart.DistanceFromPoint(dropTarget.location) > MINDRAGDIST))
{
float distance = Geometry.DistanceF(location, dropTarget.location);
if (distance < nearestDistance && distance < MAXDISTANCE)
{
nearestDistance = distance;
nearest = dropTarget;
}
}
}
return(nearest);
}
