public static LineString removeRepeatedPoints(final LineString points) {
final int axisCount = points.getAxisCount();
final List<Double> coordinates = new ArrayList<>();
double x = points.getX(0);
double y = points.getY(0);
coordinates.add(x);
coordinates.add(y);
for (int axisIndex = 2; axisIndex < axisCount; axisIndex++) {
coordinates.add(points.getCoordinate(0, axisIndex));
}
for (int i = 0; i < points.getVertexCount(); i++) {
final double x1 = points.getX(i);
final double y1 = points.getY(i);
if (x != x1 || y != y1) {
coordinates.add(x1);
coordinates.add(y1);
for (int axisIndex = 2; axisIndex < axisCount; axisIndex++) {
coordinates.add(points.getCoordinate(i, axisIndex));
}
x = x1;
y = y1;
}
}
return new LineStringDouble(axisCount, coordinates);
}
public static void setCoordinates(
final double[] coordinates,
final int axisCount,
final int i,
final LineString line,
final int j) {
for (int axisIndex = 0; axisIndex < axisCount; axisIndex++) {
final double value = line.getCoordinate(j, axisIndex);
coordinates[i * axisCount + axisIndex] = value;
}
}
public static int appendReverse(
final int axisCount,
final LineString source,
final int sourceStartIndex,
final double[] targetCoordinates,
final int targetStartIndex,
final int vertexCount) {
int coordIndex = targetStartIndex;
final int sourceVertexCount = source.getVertexCount();
double previousX;
double previousY;
if (targetStartIndex == 0) {
previousX = Double.NaN;
previousY = Double.NaN;
} else {
previousX = targetCoordinates[(targetStartIndex - 1) * axisCount];
previousY = targetCoordinates[(targetStartIndex - 1) * axisCount + 1];
}
int coordinateIndex = coordIndex * axisCount;
int sourceIndex = sourceVertexCount - 1 - sourceStartIndex;
for (int i = 0; i < vertexCount; i++) {
final double x = source.getX(sourceIndex);
final double y = source.getY(sourceIndex);
if (x != previousX || y != previousY) {
targetCoordinates[coordinateIndex++] = x;
targetCoordinates[coordinateIndex++] = y;
for (int axisIndex = 2; axisIndex < axisCount; axisIndex++) {
final double coordinate = source.getCoordinate(sourceIndex, axisIndex);
targetCoordinates[coordinateIndex++] = coordinate;
}
coordIndex++;
}
sourceIndex--;
previousX = x;
previousY = y;
}
return coordIndex;
}
@Override
public double getCoordinate(final int vertexIndex, final int axisIndex) {
final LineString line = getLine();
return line.getCoordinate(vertexIndex, axisIndex);
}