public ISnapPoint SnapPoint(ICanvas canvas, UnitPoint point, List <IDrawObject> otherobjs, Type[] runningsnaptypes, Type usersnaptype)
{
try
{
if (Type == LineType.Line || Type == LineType.Dote)
{
float thWidth = ThresholdWidth(canvas, Width);
if (runningsnaptypes != null)
{
foreach (Type snaptype in runningsnaptypes)
{
if (snaptype == typeof(VertextSnapPoint))
{
if (HitUtil.CircleHitPoint(m_p1, thWidth, point))
{
return(new VertextSnapPoint(canvas, this, m_p1));
}
if (HitUtil.CircleHitPoint(m_p2, thWidth, point))
{
return(new VertextSnapPoint(canvas, this, m_p2));
}
}
//if (snaptype == typeof(MidpointSnapPoint))
//{
// UnitPoint p = MidPoint(canvas, m_p1, m_p2, point);
// if (p != UnitPoint.Empty)
// return new MidpointSnapPoint(canvas, this, p);
//}
if (snaptype == typeof(IntersectSnapPoint))
{
LineTool otherline = Utiles.FindObjectTypeInList(this, otherobjs, typeof(LineTool)) as LineTool;
if (otherline == null)
{
continue;
}
UnitPoint p = HitUtil.LinesIntersectPoint(m_p1, m_p2, otherline.m_p1, otherline.m_p2);
if (p != UnitPoint.Empty)
{
return(new IntersectSnapPoint(canvas, this, p));
}
}
}
return(null);
}
//if (usersnaptype == typeof(MidpointSnapPoint))
// return new MidpointSnapPoint(canvas, this, HitUtil.LineMidpoint(m_p1, m_p2));
if (usersnaptype == typeof(IntersectSnapPoint))
{
LineTool otherline = Utiles.FindObjectTypeInList(this, otherobjs, typeof(LineTool)) as LineTool;
if (otherline == null)
{
return(null);
}
UnitPoint p = HitUtil.LinesIntersectPoint(m_p1, m_p2, otherline.m_p1, otherline.m_p2);
if (p != UnitPoint.Empty)
{
return(new IntersectSnapPoint(canvas, this, p));
}
}
if (usersnaptype == typeof(VertextSnapPoint))
{
double d1 = HitUtil.Distance(point, m_p1);
double d2 = HitUtil.Distance(point, m_p2);
if (d1 <= d2)
{
return(new VertextSnapPoint(canvas, this, m_p1));
}
return(new VertextSnapPoint(canvas, this, m_p2));
}
if (usersnaptype == typeof(NearestSnapPoint))
{
UnitPoint p = HitUtil.NearestPointOnLine(m_p1, m_p2, point);
if (p != UnitPoint.Empty)
{
return(new NearestSnapPoint(canvas, this, p));
}
}
if (usersnaptype == typeof(PerpendicularSnapPoint))
{
UnitPoint p = HitUtil.NearestPointOnLine(m_p1, m_p2, point);
if (p != UnitPoint.Empty)
{
return(new PerpendicularSnapPoint(canvas, this, p));
}
}
}
return(null);
}
catch (Exception ex)
{ throw ex; }
}
