public double SlopeTo(GeometricPointType p)
{
if (this.x == p.X)
{
throw new ApplicationException("Cannot compute vertical slope from "
+ "(" + this.x.ToString() + this.y.ToString() + ") to "
+ "(" + p.X.ToString() + p.Y.ToString() + ") in GeometricGeometricPointType.SlopeTo");
}
return (p.Y - this.y) / (p.X - this.x);
}
public double SlopeTo(GeometricPointType p)
{
if (this.x == p.X)
{
throw new ApplicationException("Cannot compute vertical slope from "
+ "(" + this.x.ToString() + this.y.ToString() + ") to "
+ "(" + p.X.ToString() + p.Y.ToString() + ") in GeometricGeometricPointType.SlopeTo");
}
return((p.Y - this.y) / (p.X - this.x));
}
/// <summary>
/// Removes the middle of three collinear points from a polygon
/// </summary>
/// <param name="inLine">List of points</param>
/// <returns>reduced list of points</returns>
public static List <GeometricPointType> RemoveCollinear(List <GeometricPointType> inLine)
{
List <GeometricPointType> outLine = new List <GeometricPointType>();
int N = inLine.Count;
outLine.Add(inLine[0]);
int nextPoint = 1;
int first = 0; // represents the first of three successive points
while (nextPoint < N)
{
GeometricPointType start = inLine[first];
GeometricPointType middle = inLine[(nextPoint) % N];
GeometricPointType endpoint = inLine[(nextPoint + 1) % N];
if ((middle.X == endpoint.X) && (middle.X == start.X))
{
/* do nothing*/
;
}
else if (middle.X == endpoint.X || middle.X == start.X)
{
if (N != nextPoint)
{
outLine.Add(inLine[nextPoint]);
first = nextPoint;
}
}
else if (middle.SlopeTo(start) == middle.SlopeTo(endpoint))
{
/* do nothing*/
;
}
else
{
if (N != nextPoint)
{
outLine.Add(inLine[nextPoint]);
first = nextPoint;
}
}
nextPoint = nextPoint + 1;
}//end while
return(outLine);
}
public PointType(GeometricPointType g)
{
this.x = g.X;
this.y = g.Y;
}
