/*public*/
void
OffsetCurveBuilder::getLineCurve(const CoordinateSequence *inputPts,
double nDistance, vector<CoordinateSequence*>& lineList)
{
distance = nDistance;
// a zero or (non-singlesided) negative width buffer of a line/point is empty
if (distance == 0.0) return;
if (distance < 0.0 && ! bufParams.isSingleSided()) return;
double posDistance = std::abs(distance);
std::auto_ptr<OffsetSegmentGenerator> segGen = getSegGen(posDistance);
if (inputPts->getSize() <= 1) {
computePointCurve(inputPts->getAt(0), *segGen);
} else {
if (bufParams.isSingleSided()) {
bool isRightSide = distance < 0.0;
computeSingleSidedBufferCurve(*inputPts, isRightSide, *segGen);
}
else {
computeLineBufferCurve(*inputPts, *segGen);
}
}
segGen->getCoordinates(lineList);
}
/*public*/
void
OffsetCurveBuilder::getLineCurve(const CoordinateSequence *inputPts,
double distance, vector<CoordinateSequence*>& lineList)
{
// a zero or negative width buffer of a line/point is empty
if (distance<= 0.0) return;
init(distance);
if (inputPts->getSize() <= 1) {
switch (bufParams.getEndCapStyle()) {
case BufferParameters::CAP_ROUND:
addCircle(inputPts->getAt(0), distance);
break;
case BufferParameters::CAP_SQUARE:
addSquare(inputPts->getAt(0), distance);
break;
default:
// default is for buffer to be empty
// (e.g. for a butt line cap);
break;
}
} else {
computeLineBufferCurve(*inputPts);
}
// NOTE: we take ownership of lineCoord here ...
CoordinateSequence *lineCoord=vertexList->getCoordinates();
// ... and we give it away here
lineList.push_back(lineCoord);
}
/*public*/
void
OffsetCurveBuilder::getLineCurve(const CoordinateSequence *inputPts,
double distance, vector<CoordinateSequence*>& lineList)
{
// a zero or negative width buffer of a line/point is empty
if (distance<= 0.0) return;
init(distance);
if (inputPts->getSize() < 2) {
switch (endCapStyle) {
case BufferOp::CAP_ROUND:
addCircle(inputPts->getAt(0), distance);
break;
case BufferOp::CAP_SQUARE:
addSquare(inputPts->getAt(0), distance);
break;
// default is for buffer to be empty (e.g. for a butt line cap);
}
} else {
computeLineBufferCurve(*inputPts);
}
CoordinateSequence *lineCoord=vertexList->getCoordinates();
lineList.push_back(lineCoord);
}
/*public*/
void
OffsetCurveBuilder::getSingleSidedLineCurve(const CoordinateSequence* inputPts,
double distance, vector<CoordinateSequence*>& lineList, bool leftSide,
bool rightSide)
{
// A zero or negative width buffer of a line/point is empty.
if ( distance <= 0.0 ) return ;
init( distance ) ;
if ( inputPts->getSize() < 2 )
{
// No cap, so just return.
return ;
}
else
{
computeLineBufferCurve( *inputPts ) ;
}
// NOTE: we take ownership of lineCoord here ...
std::auto_ptr<CoordinateSequence> lineCoord (vertexList->getCoordinates());
// [strk] Oct 1, 2009
// Left side: index [n-1] to [endCapIndex]
// Right side: index [endCapIndex+1] to [n-2]
// Where n is the last index (size-1).
int n = lineCoord->size() - 1 ;
// Add the left side curve to the line list.
if ( leftSide )
{
CoordinateArraySequence* coordSeq = new CoordinateArraySequence() ;
//coordSeq->add( ( *lineCoord )[n-2] ) ;
coordSeq->add( ( *lineCoord )[n-1] ) ;
for ( int i = 0 ; i <= endCapIndex ; ++i )
{
coordSeq->add( ( *lineCoord )[i] ) ;
}
lineList.push_back( coordSeq ) ;
}
// Add the right side curve to the line list.
if ( rightSide )
{
CoordinateArraySequence* coordSeq = new CoordinateArraySequence() ;
for ( int i = endCapIndex+1 ; i <= n-2 ; ++i )
{
coordSeq->add( ( *lineCoord )[i] ) ;
}
lineList.push_back( coordSeq ) ;
}
}