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Sketcher: Hyperbola: fix major radius formula

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DeepSOIC 2016-01-13 01:43:02 +03:00 committed by wmayer
parent 6fce841404
commit 180e01bcfc
1 changed files with 5 additions and 3 deletions
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8
src/Mod/Sketcher/App/planegcs/Geo.cpp
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@ -318,9 +318,11 @@ double Hyperbola::getRadMaj(const DeriVector2 &center, const DeriVector2 &f1, do
{
double cf, dcf;
cf = f1.subtr(center).length(dcf);
DeriVector2 hack (b, cf,
db, dcf);//hack = a nonsense vector to calculate major radius with derivatives, useful just because the calculation formula is the same as vector length formula
return hack.length(ret_dRadMaj);
double a, da;
a = sqrt(cf*cf - b*b);
da = (dcf*cf - db*b)/a;
ret_dRadMaj = da;
return a;
}
//returns major radius. The derivative by derivparam is returned into ret_dRadMaj argument.