public void Match(GePoint point, PositionIntent itent)
{
Debug.Assert(point != null && itent != null && m_SnapContext != null);
if (null == point || null == itent) return;
// Point match
m_SnapContext.Accept(new GePointVisitor(m_SnapContext, point));
if(m_SnapContext.HasResult())
{
itent.SetGeometryConstraint(m_SnapContext.SnappedGeometryConstraint);
itent.SetPoint(m_SnapContext.SnappedPoint);
return;
}
// Line match
return;
}
public override void StartDrag(EventContext Ctx)
{
Debug.Assert(Ctx != null);
if (null == Ctx) return;
m_DragStartPoint = (GePoint)Ctx.MouseWorldPoint.Clone();
m_DragLastPoint = (GePoint)Ctx.MouseWorldPoint.Clone();
m_Node.CanBeSelected = false;
m_Intent = null;
}
public override void Drag(EventContext Ctx)
{
Debug.Assert(Ctx != null && m_DragLastPoint != null);
if (null == Ctx || null == m_DragLastPoint) return;
GePoint CurrentPoint = Ctx.MouseWorldPoint;
SnapContext snapCtx = SnapContext.InitalizeSnapContextFromPreSelection(CurrentPoint);
SnapMatcher macher = new SnapMatcher(snapCtx);
m_Intent = new PositionIntent();
m_Intent.SetPoint(CurrentPoint);
macher.Match(CurrentPoint, m_Intent);
GePoint NewCenter = null;
if (m_Intent.IsValid())
{
m_CursorShape = m_Intent.GetCursorShape();
NewCenter = m_Intent.GetPoint();
}
else
{
m_CursorShape = "Move.cur";
GePoint OldCenter = m_Instance.CenterPoint;
NewCenter = OldCenter
+ (CurrentPoint - m_DragLastPoint);
}
m_Instance.SetCenter(NewCenter);
m_DragLastPoint = (GePoint)CurrentPoint.Clone();
m_Instance.Compute();
UpdateView();
}