double RExporter::exportLine(const RLine& line, double offset) {
double ret = RNANDOUBLE;
if (!line.isValid()) {
return ret;
}
double length = line.getLength();
if (length>1e100 || length<RS::PointTolerance) {
return ret;
}
double angle = line.getAngle();
// continuous line or
// we are in draft mode or
// QCAD is configured to show screen based line patterns
if (draftMode || screenBasedLinetypes || twoColorSelectedMode) {
exportLineSegment(line, angle);
return ret;
}
RLinetypePattern p = getLinetypePattern();
if (!p.isValid() || p.getNumDashes() <= 1) {
exportLineSegment(line, angle);
return ret;
}
p.scale(getLineTypePatternScale(p));
double patternLength = p.getPatternLength();
// avoid huge number of small segments due to very fine
// pattern or long lines:
if (patternLength<RS::PointTolerance || length / patternLength > RSettings::getDashThreshold()) {
exportLineSegment(line, angle);
return ret;
}
RVector* vp = NULL;
vp = new RVector[p.getNumDashes()];
for (int i = 0; i < p.getNumDashes(); ++i) {
vp[i] = RVector(cos(angle) * fabs(p.getDashLengthAt(i)),
sin(angle) * fabs(p.getDashLengthAt(i)));
}
if (RMath::isNaN(offset)) {
offset = p.getPatternOffset(length);
}
else {
double num = ceil(offset / patternLength);
offset -= num * patternLength;
}
bool done = false;
int i = 0;
RVector cursor(line.getStartPoint() + RVector::createPolar(offset, angle));
double total = offset;
double nextTotal;
bool isGap = false;
RLine dash;
do {
double dashLength = p.getDashLengthAt(i);
nextTotal = total + fabs(dashLength);
//qDebug() << "total: " << total;
//qDebug() << "nextTotal: " << nextTotal;
// dash, no gap. note that a dash can have a length of 0.0 (point):
if (dashLength > -RS::PointTolerance) {
isGap = false;
}
// gap:
else {
isGap = true;
}
// check if we're on the line already
// (since we might start before the line due to pattern offset):
if (nextTotal > 0.0) {
dash = RLine(cursor, cursor + vp[i]);
if (!isGap) {
// fist part is gap, then dash
ret = -nextTotal;
}
else {
// fist part is dash, then gap
ret = nextTotal;
}
// shorten at start of line:
if (total < 0.0 /*&& nextTotal > 0.0*/) {
dash.startPoint = line.startPoint;
ret = RNANDOUBLE;
}
// shorten at end of line:
if (/*total < length &&*/ nextTotal >= length - 1.0e-6) {
dash.endPoint = line.endPoint;
ret = RINFDOUBLE;
}
if (!isGap) {
exportLineSegment(dash, angle);
ret = nextTotal;
}
}
cursor += vp[i];
total = nextTotal;
done = total > length;
// export shape (zigzag, text, etc.) at end of dash / gap:
if (p.hasShapeAt(i)) {
QList<RPainterPath> pps = p.getShapeAt(i);
exportLinetypeShape(pps, line, total, length, angle, cursor);
}
++i;
if (i >= p.getNumDashes()) {
i = 0;
}
} while (!done);
delete[] vp;
return ret;
}
