/**
* Linearizes arcs and circles.
*
* @param arcOrdinates
* arc or circle coordinates
* @param dim
* coordinate dimension
* @param lrs
* whether this is an lrs geometry
* @param entireCirlce
* whether the whole arc should be linearized
* @return linearized interpolation of arcs or circle
*/
private ICoordinate[] Linearize(Double[] arcOrdinates, int dim, bool lrs,
bool entireCirlce)
{
ICoordinate[] linearizedCoords = new ICoordinate[0];
// CoordDim is the dimension that includes only non-measure (X,Y,Z)
// ordinates in its value
int coordDim = lrs ? dim - 1 : dim;
// this only works with 2-Dimensional geometries, since we use
// JGeometry linearization;
if (coordDim != 2)
{
throw new ArgumentException(
"Can only linearize 2D arc segments, but geometry is "
+ dim + "D.");
}
int numOrd = dim;
while (numOrd < arcOrdinates.Length)
{
numOrd = numOrd - dim;
double x1 = arcOrdinates[numOrd++];
double y1 = arcOrdinates[numOrd++];
double m1 = lrs ? arcOrdinates[numOrd++] : Double.NaN;
double x2 = arcOrdinates[numOrd++];
double y2 = arcOrdinates[numOrd++];
double m2 = lrs ? arcOrdinates[numOrd++] : Double.NaN;
double x3 = arcOrdinates[numOrd++];
double y3 = arcOrdinates[numOrd++];
double m3 = lrs ? arcOrdinates[numOrd++] : Double.NaN;
ICoordinate[] coords;
if (entireCirlce)
{
coords = Circle.LinearizeCircle(x1, y1, x2, y2, x3, y3);
}
else
{
coords = Circle.LinearizeArc(x1, y1, x2, y2, x3, y3);
}
// if this is an LRS geometry, fill the measure values into
// the linearized array
if (lrs)
{
ICoordinate[] mcoord = new ICoordinate[coords.Length];
int lastIndex = coords.Length - 1;
mcoord[0] = MCoordinate.Create2dWithMeasure(x1, y1, m1);
mcoord[lastIndex] = MCoordinate.Create2dWithMeasure(x3, y3, m3);
// convert the middle coordinates to MCoordinate
for (int i = 1; i < lastIndex; i++)
{
mcoord[i] = MCoordinate.ConvertCoordinate(coords[i]);
// if we happen to split on the middle measure, then
// assign it
if (mcoord[i].X == x2 &&
mcoord[i].Y == y2)
{
((MCoordinate)mcoord[i]).M = m2;
}
}
coords = mcoord;
}
// if this is not the first arcsegment, the first linearized
// point is already in linearizedArc, so disregard this.
int resultBegin = 1;
if (linearizedCoords.Length == 0)
{
resultBegin = 0;
}
int destPos = linearizedCoords.Length;
ICoordinate[] tmpCoords = new Coordinate[linearizedCoords.Length
+ coords.Length - resultBegin];
Array.Copy(linearizedCoords, 0, tmpCoords, 0, linearizedCoords.Length);
Array.Copy(coords, resultBegin, tmpCoords, destPos, coords.Length - resultBegin);
linearizedCoords = tmpCoords;
}
return(linearizedCoords);
}
