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libarea: improve arc fit

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Zheng, Lei
2017-11-30 12:02:34 +08:00
parent 7249365823
commit b640b9865b
1 changed files with 5 additions and 1 deletions
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6
src/Mod/Path/libarea/Curve.cpp
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@@ -88,7 +88,11 @@ bool CCurve::CheckForArc(const CVertex& prev_vt, std::list<const CVertex*>& migh
Circle c(p0, p1, p2);
const CVertex* current_vt = &prev_vt;
double accuracy = CArea::m_accuracy * 1.4 / CArea::m_units;
// It seems that ClipperLib's offset ArcTolerance (same as m_accuracy here)
// is not exactly what's documented at https://goo.gl/4odfQh. Test shows the
// maximum arc distance deviate at about 2.2*ArcTolerance units. The maximum
// deviance seems to always occur at the end of arc.
double accuracy = CArea::m_accuracy * 2.3 / CArea::m_units;
for(std::list<const CVertex*>::iterator It = might_be_an_arc.begin(); It != might_be_an_arc.end(); It++)
{
const CVertex* vt = *It;