QList<RVector> RSpline::getPointsWithDistanceToEnd(double distance, int from) const {
QList<RVector> ret;
if (splineProxy!=NULL) {
double t;
if (from&RS::FromStart) {
t = splineProxy->getTAtDistance(*this, distance);
ret << getPointAt(t);
}
if (from&RS::FromEnd) {
t = splineProxy->getTAtDistance(*this, getLength() - distance);
ret << getPointAt(t);
}
}
else {
// no spline proxy (not precise, but better than nothing in some cases):
double length = getLength();
if (length<=RS::PointTolerance) {
return ret;
}
if (from&RS::FromStart) {
RVector p = getPointAt(getTMin() + (distance/length*getTDelta()));
ret.append(p);
}
if (from&RS::FromEnd) {
RVector p = getPointAt(getTMin() + ((length-distance)/length*getTDelta()));
ret.append(p);
}
}
return ret;
}
/**
* \return List of RLines describing this spline.
*/
QList<QSharedPointer<RShape> > RSpline::getExploded(int segments) const {
if (!exploded.isEmpty() && segments==-1) {
return exploded;
}
//qDebug() << "RSpline::getExploded: segments: " << segments;
//RDebug::printBacktrace("getExploded: ");
//##boundingBox = RBox();
updateInternal();
exploded.clear();
if (!isValid()) {
//qWarning() << "RSpline::getExploded: invalid spline";
return exploded;
}
if (segments==-1) {
segments = 8;
}
double tMin = getTMin();
double tMax = getTMax();
double step = getTDelta() / (controlPoints.size() * segments);
RVector p1;
RVector prev = RVector::invalid;
for (double t = tMin; t<tMax+(step/2.0); t+=step) {
double tc = qMin(t, tMax);
p1 = getPointAt(tc);
if (RMath::isNaN(p1.x) || RMath::isNaN(p1.y)) {
continue;
}
if (prev.isValid()) {
RLine* line = new RLine(prev, p1);
exploded.append(QSharedPointer<RShape>(line));
}
prev = p1;
//##boundingBox.growToInclude(p1);
}
p1 = getEndPoint();
if (!RMath::isNaN(p1.x) && !RMath::isNaN(p1.y)) {
if (prev.isValid()) {
RLine* line = new RLine(prev, p1);
// prevent zero length line at the end:
if (line->getLength()>1.0e-4) {
exploded.append(QSharedPointer<RShape>(line));
}
}
}
return exploded;
}
QList<RVector> RSpline::getPointsWithDistanceToEnd(double distance, RS::From from) const {
QList<RVector> ret;
double length = getLength();
if (length<=RS::PointTolerance) {
return ret;
}
if (from==RS::FromStart || from==RS::FromAny) {
RVector p = getPointAt(getTMin() + (distance/length*getTDelta()));
ret.append(p);
}
if (from==RS::FromEnd || from==RS::FromAny) {
RVector p = getPointAt(getTMin() + ((length-distance)/length*getTDelta()));
ret.append(p);
}
return ret;
}
RVector RSpline::getMiddlePoint() const {
return getPointAt(getTMin() + (getTDelta()/2.0));
}