Esempio n. 1
0
Coordinate LengthIndexedLine::extractPoint(double index, double offsetDistance) const
{
	LinearLocation loc = LengthLocationMap::getLocation(linearGeom, index);
	Coordinate ret;
	loc.getSegment(linearGeom)->pointAlongOffset(loc.getSegmentFraction(), offsetDistance, ret);
	return ret;
}
Esempio n. 2
0
/* public static */
LinearLocation
LinearLocation::getEndLocation(const Geometry* linear)
{
	// assert: linear is LineString or MultiLineString
	LinearLocation loc;
	loc.setToEnd(linear);
	return loc;
}
Esempio n. 3
0
LinearIterator::LinearIterator(const Geometry* linear, const LinearLocation& start):
		vertexIndex(segmentEndVertexIndex(start)),
		componentIndex(start.getComponentIndex()),
		linear(linear),
		numLines(static_cast<unsigned int>(linear->getNumGeometries()))
{
	loadCurrentLine();
}
Esempio n. 4
0
/* private */
LinearLocation
LengthLocationMap::resolveHigher(const LinearLocation& loc) const
{
    if (! loc.isEndpoint(*linearGeom)) return loc;

    unsigned int compIndex = loc.getComponentIndex();
    // if last component can't resolve any higher
    if (compIndex >= linearGeom->getNumGeometries() - 1) return loc;

    do {
        compIndex++;
    } while (compIndex < linearGeom->getNumGeometries() - 1
             && linearGeom->getGeometryN(compIndex)->getLength() == 0);

    // resolve to next higher location
    return LinearLocation(compIndex, 0, 0.0);
}
Esempio n. 5
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double LengthLocationMap::getLength(const LinearLocation& loc) const
{
	double totalLength = 0.0;

	LinearIterator it(linearGeom);
	while (it.hasNext())
	{
		if (! it.isEndOfLine())
		{
			Coordinate p0 = it.getSegmentStart();
			Coordinate p1 = it.getSegmentEnd();
			double segLen = p1.distance(p0);
			// length falls in this segment
			if (loc.getComponentIndex() == it.getComponentIndex()
					&& loc.getSegmentIndex() == it.getVertexIndex())
			{
				return totalLength + segLen * loc.getSegmentFraction();
			}
			totalLength += segLen;
		}
		it.next();
	}
	return totalLength;
}
Esempio n. 6
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unsigned int LinearIterator::segmentEndVertexIndex(const LinearLocation& loc)
{
	if (loc.getSegmentFraction() > 0.0)
		return loc.getSegmentIndex() + 1;
	return loc.getSegmentIndex();
}
Esempio n. 7
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Coordinate LengthIndexedLine::extractPoint(double index) const
{
	LinearLocation loc = LengthLocationMap::getLocation(linearGeom, index);
	Coordinate coord = loc.getCoordinate(linearGeom);
	return coord;
}