/// <summary>
/// Creates a new instance of Segment
/// </summary>
public Segment(Vertex p1, Vertex p2)
{
P1 = p1;
P2 = p2;
}
/// <summary>
/// Tests to see if the specified segment contains the point within Epsilon tollerance.
/// </summary>
/// <returns></returns>
public bool IntersectsVertex(Vertex point)
{
double x1 = P1.X;
double y1 = P1.Y;
double x2 = P2.X;
double y2 = P2.Y;
double pX = point.X;
double pY = point.Y;
// COllinear
if (Math.Abs((x2 - x1) * (pY - y1) - (pX - x1) * (y2 - y1)) > Epsilon) return false;
// In the x is in bounds and it is colinear, it is on the segment
if (x1 < x2)
{
if (x1 <= pX && pX <= x2) return true;
}
else
{
if (x2 <= pX && pX <= x1) return true;
}
return false;
}
/// <summary>
/// Creates a segment from double valued ordinates.
/// </summary>
/// <param name="x1"></param>
/// <param name="y1"></param>
/// <param name="x2"></param>
/// <param name="y2"></param>
public Segment(double x1, double y1, double x2, double y2)
{
P1 = new Vertex(x1, y1);
P2 = new Vertex(x2, y2);
}
/// <summary>
/// Gets the first vertex from the first part.
/// </summary>
/// <returns></returns>
public Vertex First()
{
double[] verts = Parts[0].Vertices;
Vertex result = new Vertex(verts[StartIndex], verts[StartIndex+1]);
return result;
}
/// <summary>
/// Creates a new "point" shape that has only the one point.
/// </summary>
/// <param name="v"></param>
public ShapeRange(Vertex v)
{
FeatureType = FeatureTypes.Point;
Parts = new List<PartRange>();
_numParts = -1;
double[] coords = new double[2];
coords[0] = v.X;
coords[1] = v.Y;
PartRange prt = new PartRange(coords, 0,0, FeatureTypes.Point);
prt.NumVertices = 1;
Parts.Add(prt);
}
/// <summary>
/// Creates a point from a 2D vertex.
/// </summary>
/// <param name="v"></param>
public Point(Vertex v):this(new Coordinate(v.X, v.Y), DefaultFactory)
{
}
/// <summary>
///
/// </summary>
/// <param name="other"></param>
/// <returns></returns>
public bool Equals(Vertex other)
{
return other.X == X && other.Y == Y;
}
/// <summary>
/// Tests to see if the point is inside or on the boundary of this extent.
/// </summary>
/// <param name="vert"></param>
/// <returns></returns>
public bool Intersects(Vertex vert)
{
if (vert.X < XMin) return false;
if (vert.X > XMax) return false;
if (vert.Y < YMin) return false;
if (vert.Y > YMax) return false;
return true;
}
