/// <summary>
/// Creates a circular Polygon.
/// </summary>
/// <returns> A circle. </returns>
public virtual Polygon CreateCircle()
{
Envelope env = dim.Envelope;
double xRadius = env.Width / 2.0;
double yRadius = env.Height / 2.0;
double centreX = env.MinX + xRadius;
double centreY = env.MinY + yRadius;
Coordinate[] pts = new Coordinate[nPts + 1];
int iPt = 0;
for (int i = 0; i < nPts; i++)
{
double ang = i * (2 * Math.PI / nPts);
double x = xRadius * Math.Cos(ang) + centreX;
double y = yRadius * Math.Sin(ang) + centreY;
Coordinate pt = new Coordinate(x, y);
pts[iPt++] = pt;
}
pts[iPt] = pts[0];
if (geomFact != null)
{
LinearRing ring = geomFact.CreateLinearRing(pts);
Polygon poly = geomFact.CreatePolygon(ring, null);
return(poly);
}
else
{
LinearRing ring = this.CreateLinearRing(pts);
Polygon poly = this.CreatePolygon(ring, null);
return(poly);
}
}
/// <summary>
/// Constructs a Polygon with the given exterior boundary and
/// interior boundaries.
///
/// </summary>
/// <param name="">shell
/// the outer boundary of the new Polygon, or
/// null or an empty LinearRing if
/// the empty geometry is to be created.
/// </param>
/// <param name="">holes
/// the inner boundaries of the new Polygon, or
/// null or empty LinearRing s if
/// the empty geometry is to be created.
/// </param>
public virtual Polygon CreatePolygon(LinearRing shell, LinearRing[] holes)
{
return(new Polygon(shell, holes, this));
}
/// <summary>
/// Creates a rectangular Polygon.
/// </summary>
/// <returns> A rectangular Polygon </returns>
public virtual Polygon CreateRectangle()
{
int i;
int ipt = 0;
int nSide = nPts / 4;
if (nSide < 1)
{
nSide = 1;
}
double XsegLen = dim.Envelope.Width / nSide;
double YsegLen = dim.Envelope.Height / nSide;
Coordinate[] pts = new Coordinate[4 * nSide + 1];
Envelope env = dim.Envelope;
// double maxx = env.MinX + nSide * XsegLen;
// double maxy = env.MinY + nSide * XsegLen;
for (i = 0; i < nSide; i++)
{
double x = env.MinX + i * XsegLen;
double y = env.MinY;
pts[ipt++] = new Coordinate(x, y);
}
for (i = 0; i < nSide; i++)
{
double x = env.MaxX;
double y = env.MinY + i * YsegLen;
pts[ipt++] = new Coordinate(x, y);
}
for (i = 0; i < nSide; i++)
{
double x = env.MaxX - i * XsegLen;
double y = env.MaxY;
pts[ipt++] = new Coordinate(x, y);
}
for (i = 0; i < nSide; i++)
{
double x = env.MinX;
double y = env.MaxY - i * YsegLen;
pts[ipt++] = new Coordinate(x, y);
}
pts[ipt++] = new Coordinate(pts[0]);
if (geomFact != null)
{
LinearRing ring = geomFact.CreateLinearRing(pts);
Polygon poly = geomFact.CreatePolygon(ring, null);
return(poly);
}
else
{
LinearRing ring = this.CreateLinearRing(pts);
Polygon poly = this.CreatePolygon(ring, null);
return(poly);
}
}
