public LineSeg(Point2D a, Point2D b)
{
p[0] = a;
p[1] = b;
}
public Extent2D(double minx, double miny, double maxx, double maxy)
{
min = new Point2D(minx, miny);
max = new Point2D(maxx, maxy);
IsNull = false;
}
public bool IsPointIn(Point2D point)
{
return(point.X >= min.X && point.X <= max.X && point.Y >= min.Y && point.Y <= max.Y);
}
public Extent2D(Point2D p1, Point2D p2)
{
min = new Point2D(Math.Min(p1.X, p2.X), Math.Min(p1.Y, p2.Y));
max = new Point2D(Math.Max(p1.X, p2.X), Math.Max(p1.Y, p2.Y));
IsNull = false;
}
public Extent2D(IEnumerable <Point2D> pts)
{
min = new Point2D(pts.Min(p => p.X), pts.Min(p => p.Y));
max = new Point2D(pts.Max(p => p.X), pts.Max(p => p.Y));
IsNull = false;
}
public double DistToPoint(Point2D p)
{
Point2D foot;
return(DistToPoint(p, out foot));
}
public double GetDistAtPoint(Point2D p)
{
double distance = 0;
bool isOnLine = false;
if (points.Count == 0)
{
return(-1);
}
else if (points.Count == 1)
{
return(Math.Sqrt((p.X - points[0].X) * (p.X - points[0].X) + (p.Y - points[0].Y) * (p.Y - points[0].Y)));
}
else
{
int count = points.Count;
for (int i = 0; i < count - 1; i++)
{
if (points[i].X == points[i + 1].X && p.X == points[i].X)
{
if ((p.Y - points[i].Y) * (p.Y - points[i + 1].Y) <= 0)
{
distance = distance + Math.Sqrt((p.X - points[i].X) * (p.X - points[i].X) + (p.Y - points[i].Y) * (p.Y - points[i].Y));
isOnLine = true;
break;
}
else
{
isOnLine = false;
break;
}
}
else if (points[i].Y == points[i + 1].Y && p.Y == points[i].Y)
{
if ((p.X - points[i].X) * (p.X - points[i + 1].X) <= 0)
{
distance = distance + Math.Sqrt((p.X - points[i].X) * (p.X - points[i].X) + (p.Y - points[i].Y) * (p.Y - points[i].Y));
isOnLine = true;
break;
}
else
{
isOnLine = false;
break;
}
}
else
{
if ((p.Y - points[i].Y) / (p.X - points[i].X) == (p.Y - points[i + 1].Y) / (p.X - points[i + 1].X) && (p.Y - points[i].Y != 0) && (points[i + 1].X - points[i].X) * (p.X - points[i].X) >= 0)
{
distance = distance + Math.Sqrt((p.X - points[i].X) * (p.X - points[i].X) + (p.Y - points[i].Y) * (p.Y - points[i].Y));
isOnLine = true;
break;
}
else
{
distance = distance + Math.Sqrt((points[i + 1].X - points[i].X) * (points[i + 1].X - points[i].X) + (points[i + 1].Y - points[i].Y) * (points[i + 1].Y - points[i].Y));
}
}
}
}
if (!isOnLine)
{
distance = -1;
}
return(distance);
}
public void Insert(int index, Point2D p)
{
points.Insert(index, p);
}
public Point2D TransformBack(Point2D p)
{
return(new Point2D(p.X / ScaleX21 + X21, p.Y / ScaleY21 + Y21));
}
public Point2D Transform(Point2D p)
{
return(new Point2D((p.X - X21) * ScaleX21, (p.Y - Y21) * ScaleY21));
}