https://bugs.documentfoundation.org/show_bug.cgi?id=99102
--- Comment #6 from Regina Henschel <rb.hensc...@t-online.de> ---
One error is in case basegfx::B2DLineJoin::Miter in
WinSalGraphicsImpl::drawPolyLine, in /core/vcl/win/gdi/gdiimpl.cxx
Currently it is
case basegfx::B2DLineJoin::Miter :
{
const Gdiplus::REAL aMiterLimit(15.0);
aPen.SetMiterLimit(aMiterLimit);
aPen.SetLineJoin(Gdiplus::LineJoinMiter);
break;
}
But the type "Gdiplus::LineJoinMiter" acts different than LO. The correct type
is "Gdiplus::LineJoinMiterClipped" see
https://msdn.microsoft.com/en-us/library/windows/desktop/ms534148%28v=vs.85%29.aspx
Therefore it should be in content
case basegfx::B2DLineJoin::Miter :
{
const Gdiplus::REAL aMiterLimit(1/sin(7.5*F_PI180));
aPen.SetMiterLimit(aMiterLimit);
aPen.SetLineJoin(Gdiplus::LineJoinMiterClipped);
break;
}
There exist the general formula
miter length = 1 / sin (phi/2 )
where phi is the angle between the lines. As Gdi+ expects a miter limit and LO
uses a minimum angle, you have to convert it. Currently LO has only default 15°
as minimum angle. Making the angle variable is work in progress.
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