protected override void OnMouseDown(Rhino.Input.Custom.GetPointMouseEventArgs e)
{
if (m_dc.PickResult.Mode != Rhino.UI.Gumball.GumballMode.None)
{
return;
}
m_dc.PickResult.SetToDefault();
Rhino.Input.Custom.PickContext pick_context = new Rhino.Input.Custom.PickContext();
pick_context.View = e.Viewport.ParentView;
pick_context.PickStyle = Rhino.Input.Custom.PickStyle.PointPick;
var xform = e.Viewport.GetPickTransform(e.WindowPoint);
pick_context.SetPickTransform(xform);
Rhino.Geometry.Line pick_line;
e.Viewport.GetFrustumLine(e.WindowPoint.X, e.WindowPoint.Y, out pick_line);
pick_context.PickLine = pick_line;
pick_context.UpdateClippingPlanes();
// pick gumball and, if hit, set getpoint dragging constraints.
m_dc.PickGumball(pick_context, this);
}
