public GE_Point PerpendPoint(GE_Point pt)
{
GE_Point ptRet;
if (m_Kind == 1)
{
GE_Vector v = Geo.GetVector(m_CenterPoint, pt);
ptRet = m_CenterPoint + v * m_Radiu;
}
else
{
double dL = Length();
List <GE_Point> ayPoints = new List <GE_Point>();
ayPoints.Add(m_StartPoint);
ayPoints.Add(m_EndPoint);
ayPoints.Add(pt);
double dArea = Geo.AreaRange(ayPoints);
double dDist = dArea * 2 / dL;
GE_Vector vp = Vector();
if (Geo.AcGePosition(m_StartPoint, m_EndPoint, pt) > 0)
{
vp.RotateBy(Geo.PI2);
}
else
{
vp.RotateBy(-Geo.PI2);
}
ptRet = pt + vp * dDist;
}
return(ptRet);
}
static public bool GetArcByPoint(GE_Point pt1, GE_Point pt2, GE_Point pt3, out GE_Point ptCenter)
{
bool bRet = false;
ptCenter = new GE_Point();
GE_Line lin1 = new GE_Line();
GE_Line lin2 = new GE_Line();
GE_Point ptM1 = Geo.AcGeMidPoint(pt1, pt2);
GE_Point ptM2 = Geo.AcGeMidPoint(pt2, pt3);
GE_Vector vp = Geo.GetVector(pt1, pt2);
vp.RotateBy(PI2);
lin1.set(ptM1, ptM1 + vp * 100.0);
vp = Geo.GetVector(pt2, pt3);
vp.RotateBy(PI2);
lin2.set(ptM2, ptM2 + vp * 100.0);
GE_Point ptCen1, ptCen2;
int nRet = lin1.intersectWith(lin2, out ptCen1, out ptCen2);
if (nRet > 0)
{
ptCenter = ptCen1;
bRet = true;
}
return(bRet);
}
public GE_Vector Vector()
{
return(Geo.GetVector(m_StartPoint, m_EndPoint));
}