public SnapBase FindSnapPoint(Point hit)
{
List <SnapBase> candidates = new List <SnapBase>();
foreach (Layer la in LayerCollection.FindAll(la => la.visible))
{
SnapBase obj = la.GetHitObject(hit) as SnapBase;
if (obj != null)
{
candidates.Add(obj);
}
if (candidates.Count > 0)
{
return(candidates.OrderBy(p => p.Distance2(hit)).First());
}
}
return(null);
}
private bool isDraggingObject(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left && __selectedObject != null)
{
LineEdgePoint line = __selectedObject as LineEdgePoint;
SnapBase p = __selectedObject as SnapBase;
if (__selectedObject is LineEdgePoint)
{
Point diff = mouseLocation.current - new Size(mouseLocation.last);
line.__start.Location += new Size(diff);
line.__end.Location += new Size(diff);
}
else if (__selectedObject is SnapBase && (p.Type == PointType.start || p.Type == PointType.end || p.Type == PointType.center))
{
p.Location = mouseLocation.current;
}
return(true);
}
return(false);
}
protected bool isSnapChanged(Point e)
{
bool repaint = false;
SnapBase newsnap = __dataModel.FindSnapPoint(e);
if (__snap == null && newsnap == null) // not close to any snapPoint
{
repaint = false;
}
else if (newsnap != null && !newsnap.Equals(__snap) || // approach new snapPoint
(newsnap == null && __snap != null)) // away from old snapPoint need to clear
{
repaint = true;
}
//update
if ((__snap = newsnap) != null)
{
mouseLocation.current = Point.Round(__snap.Location);
}
return(repaint);
}
