protected bool InCone(TPPLPoint p1, TPPLPoint p2, TPPLPoint p3, TPPLPoint p)
{
bool convex;
convex = IsConvex(p1, p2, p3);
if (convex)
{
if (!IsConvex(p1, p2, p))
{
return(false);
}
if (!IsConvex(p2, p3, p))
{
return(false);
}
return(true);
}
else
{
if (IsConvex(p1, p2, p))
{
return(true);
}
if (IsConvex(p2, p3, p))
{
return(true);
}
return(false);
}
}
public void Triangle(TPPLPoint a, TPPLPoint b, TPPLPoint c)
{
Clear();
Points = new List <TPPLPoint>(3)
{
a, b, c
};
}
protected tppl_float Distance(TPPLPoint p1, TPPLPoint p2)
{
tppl_float dx, dy;
dx = p2.X - p1.X;
dy = p2.Y - p1.Y;
return((tppl_float)Math.Sqrt(dx * dx + dy * dy));
}
protected bool InCone(PartitionVertex v, TPPLPoint p)
{
TPPLPoint p1, p2, p3;
p1 = v.previous.p;
p2 = v.p;
p3 = v.next.p;
return(InCone(p1, p2, p3, p));
}
public TPPLPoly(int numPoints)
{
Clear();
Points = new List <TPPLPoint>(numPoints);
for (int i = 0; i < numPoints; i++)
{
Points[i] = new TPPLPoint();
}
}
protected int Intersects(TPPLPoint p11, TPPLPoint p12, TPPLPoint p21, TPPLPoint p22)
{
if ((p11.X == p21.X) && (p11.Y == p21.Y))
{
return(0);
}
if ((p11.X == p22.X) && (p11.Y == p22.Y))
{
return(0);
}
if ((p12.X == p21.X) && (p12.Y == p21.Y))
{
return(0);
}
if ((p12.X == p22.X) && (p12.Y == p22.Y))
{
return(0);
}
TPPLPoint v1ort = new TPPLPoint(),
v2ort = new TPPLPoint(),
v = new TPPLPoint();
tppl_float dot11, dot12, dot21, dot22;
v1ort.X = p12.Y - p11.Y;
v1ort.Y = p11.X - p12.X;
v2ort.X = p22.Y - p21.Y;
v2ort.Y = p21.X - p22.X;
v = p21 - p11;
dot21 = v.X * v1ort.X + v.Y * v1ort.Y;
v = p22 - p11;
dot22 = v.X * v1ort.X + v.Y * v1ort.Y;
v = p11 - p21;
dot11 = v.X * v2ort.X + v.Y * v2ort.Y;
v = p12 - p21;
dot12 = v.X * v2ort.X + v.Y * v2ort.Y;
if (dot11 * dot12 > 0)
{
return(0);
}
if (dot21 * dot22 > 0)
{
return(0);
}
return(1);
}
protected bool IsReflex(TPPLPoint p1, TPPLPoint p2, TPPLPoint p3)
{
tppl_float tmp;
tmp = (p3.Y - p1.Y) * (p2.X - p1.X) - (p3.X - p1.X) * (p2.Y - p1.Y);
if (tmp < 0)
{
return(true);
}
else
{
return(false);
}
}
public static bool IsConvex(TPPLPoint p1, TPPLPoint p2, TPPLPoint p3)
{
tppl_float tmp;
tmp = (p3.Y - p1.Y) * (p2.X - p1.X) - (p3.X - p1.X) * (p2.Y - p1.Y);
if (tmp > 0)
{
return(true);
}
else
{
return(false);
}
}
public TPPLPoly(TPPLPoly src)
{
Clear();
Hole = src.Hole;
if (src.Points != null)
{
Points = new List <TPPLPoint>(src.Points.Count);
for (int i = 0; i < Points.Count; i++)
{
Points[i] = new TPPLPoint(src.Points[i]);
}
}
}
protected bool IsInside(TPPLPoint p1, TPPLPoint p2, TPPLPoint p3, TPPLPoint p)
{
if (IsConvex(p1, p, p2))
{
return(false);
}
if (IsConvex(p2, p, p3))
{
return(false);
}
if (IsConvex(p3, p, p1))
{
return(false);
}
return(true);
}
TPPLPoint Normalize(TPPLPoint p)
{
TPPLPoint r = new TPPLPoint();
tppl_float n = (tppl_float)Math.Sqrt(p.X * p.X + p.Y * p.Y);
if (n != (tppl_float)0)
{
r = p / n;
}
else
{
r.X = 0;
r.Y = 0;
}
return(r);
}
public TPPLPoly(TPPLPoint a, TPPLPoint b, TPPLPoint c)
{
Triangle(a, b, c);
}
public TPPLPoint(TPPLPoint src)
{
X = src.X;
Y = src.Y;
Id = src.Id;
}