void RGraphicsSceneQt::exportArcSegment(const RArc& arc, bool allowForZeroLength) {
Q_ASSERT(currentPainterPath.isValid());
if (arc.getRadius()<RS::PointTolerance) {
currentPainterPath.addPoint(arc.getCenter());
return;
}
// arc threshold is configurable (FS#1012):
if (arc.getAngleLength(allowForZeroLength)<=RSettings::getArcAngleLengthThreshold()) {
// Qt won't export a zero length line as point:
RVector startPoint = arc.getStartPoint() - RVector::createPolar(0.01, arc.getStartAngle()+M_PI_2);
RVector endPoint = arc.getEndPoint() + RVector::createPolar(0.01, arc.getStartAngle()+M_PI_2);
currentPainterPath.moveTo(startPoint);
currentPainterPath.lineTo(endPoint);
return;
}
// arc approximation with splines: faster but not precise enough:
// RPainterPath p;
// p.addArc(arc);
// currentPainterPath.addPath(p);
if (twoColorSelectedMode) {
// QPainterPath with pattern shown as solid when clipped bug workaround:
currentPainterPath.moveTo(arc.getStartPoint());
currentPainterPath.arcTo(
arc.getCenter().x-arc.getRadius(),
arc.getCenter().y-arc.getRadius(),
arc.getRadius()*2, arc.getRadius()*2,
RMath::rad2deg(-arc.getStartAngle()),
RMath::rad2deg(-arc.getSweep())
);
}
else {
currentPainterPath.setAutoRegen(true);
RGraphicsScene::exportArcSegment(arc, allowForZeroLength);
}
}
QList<RVector> RShape::getIntersectionPointsAT(const RArc& arc1,
const RTriangle& triangle2, bool limited) {
Q_UNUSED(limited)
RTriangle plane(arc1.getCenter(), arc1.getStartPoint(), arc1.getEndPoint());
QList<RVector> r = plane.getIntersectionPoints(RLine(triangle2.getCorner(0), triangle2.getCorner(1)));
r.append(plane.getIntersectionPoints(RLine(triangle2.getCorner(1), triangle2.getCorner(2))));
r.append(plane.getIntersectionPoints(RLine(triangle2.getCorner(2), triangle2.getCorner(0))));
if (r.size()<2) {
return QList<RVector>();
}
RLine l(r[0], r[1]);
return l.getIntersectionPoints(arc1);
}
void RExporter::exportArcSegment(const RArc& arc) {
double segmentLength;
if (pixelSizeHint>0.0) {
// approximate arc with segments with the length of 2 pixels:
segmentLength = pixelSizeHint * 2;
}
else {
segmentLength = arc.getRadius() / 40.0;
}
// avoid a segment length of 0:
if (segmentLength<1.0e-4) {
segmentLength = 1.0e-4;
}
double a1 = arc.getStartAngle();
double a2 = arc.getEndAngle();
RVector center = arc.getCenter();
double radius = arc.getRadius();
// avoid huge radius and slow down to almost stand-still:
if (radius>1.0e6) {
return;
}
double aStep;
if (radius<1.0e-3) {
aStep = 0.1;
}
else {
aStep = segmentLength / radius;
if (aStep>1.0) {
aStep = 1.0;
}
double minAStep = 2*M_PI/360.0;
if (!draftMode) {
minAStep /= 4;
}
if (aStep<minAStep) {
aStep = minAStep;
}
}
RVector prev = arc.getStartPoint();
RVector ci;
double a;
if(!arc.isReversed()) {
// Arc Counterclockwise:
if(a1>a2-RS::AngleTolerance) {
a2+=2*M_PI;
}
for(a=a1+aStep; a<=a2; a+=aStep) {
ci.x = center.x + cos(a) * radius;
ci.y = center.y + sin(a) * radius;
//path.lineTo(RVector(ci.x, ci.y));
this->exportLineSegment(RLine(prev, ci));
prev = ci;
}
} else {
// Arc Clockwise:
if(a1<a2+RS::AngleTolerance) {
a2-=2*M_PI;
}
for(a=a1-aStep; a>=a2; a-=aStep) {
ci.x = center.x + cos(a) * radius;
ci.y = center.y + sin(a) * radius;
this->exportLineSegment(RLine(prev, ci));
//path.lineTo(RVector(cix, ciy));
prev = ci;
}
}
this->exportLineSegment(RLine(prev, arc.getEndPoint()));
//path.lineTo(arc.getEndPoint());
}
void RExporter::exportArcSegment(const RArc& arc, bool allowForZeroLength) {
if (allowForZeroLength && arc.isFullCircle()) {
exportLineSegment(RLine(arc.getStartPoint(), arc.getEndPoint()), arc.getDirection1());
return;
}
double segmentLength;
if (pixelSizeHint>0.0) {
// approximate arc with segments with the length of 2 pixels:
segmentLength = pixelSizeHint * 2;
}
else {
segmentLength = arc.getRadius() / 40.0;
}
// avoid a segment length of 0:
if (segmentLength<1.0e-4) {
segmentLength = 1.0e-4;
}
double a1 = arc.getStartAngle();
double a2 = arc.getEndAngle();
RVector center = arc.getCenter();
double radius = arc.getRadius();
double aStep;
if (radius<1.0e-3) {
aStep = 0.1;
}
else {
aStep = segmentLength / radius;
if (aStep>1.0) {
aStep = 1.0;
}
double minAStep = RSettings::getMinArcAngleStep();
if (draftMode) {
minAStep *= 4;
}
if (aStep<minAStep) {
aStep = minAStep;
}
}
RVector prev = arc.getStartPoint();
RVector ci;
double a;
if (!arc.isReversed()) {
// Arc Counterclockwise:
if(a1>a2-RS::AngleTolerance) {
a2+=2*M_PI;
}
for (a=a1+aStep; a<=a2; a+=aStep) {
ci.x = center.x + cos(a) * radius;
ci.y = center.y + sin(a) * radius;
exportLineSegment(RLine(prev, ci), a+M_PI_2);
prev = ci;
}
} else {
// Arc Clockwise:
if (a1<a2+RS::AngleTolerance) {
a2-=2*M_PI;
}
for (a=a1-aStep; a>=a2; a-=aStep) {
ci.x = center.x + cos(a) * radius;
ci.y = center.y + sin(a) * radius;
exportLineSegment(RLine(prev, ci), a+M_PI_2);
prev = ci;
}
}
this->exportLineSegment(RLine(prev, arc.getEndPoint()), arc.getEndAngle()+M_PI_2);
}
