diff options
| -rw-r--r-- | src/helper/geom-pathstroke.cpp | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/src/helper/geom-pathstroke.cpp b/src/helper/geom-pathstroke.cpp index aaafea98f..e7ee3b5f8 100644 --- a/src/helper/geom-pathstroke.cpp +++ b/src/helper/geom-pathstroke.cpp @@ -421,7 +421,14 @@ void join_inside(Geom::Path& res, Geom::Curve const& outgoing) } } -void outline_helper(Geom::Path& res, Geom::Path const& to_add, double width, double miter, Inkscape::LineJoinType join) +bool decide(Geom::Curve const& incoming, Geom::Curve const& outgoing) +{ + Geom::Point tang1 = Geom::unitTangentAt(reverse(incoming.toSBasis()), 0.); + Geom::Point tang2 = outgoing.unitTangentAt(0.); + return (Geom::cross(tang1, tang2) < 0); +} + +void outline_helper(Geom::Path& res, Geom::Path const& to_add, double width, bool on_outside, double miter, Inkscape::LineJoinType join) { if (res.size() == 0 || to_add.size() == 0) return; @@ -434,10 +441,6 @@ void outline_helper(Geom::Path& res, Geom::Path const& to_add, double width, dou return; } - Geom::Point tang1 = Geom::unitTangentAt(reverse(res.back().toSBasis()), 0.); - Geom::Point tang2 = Geom::unitTangentAt(to_add.front().toSBasis(), 0.); - bool on_outside = (Geom::cross(tang1, tang2) < 0); - if (on_outside) { join_func *jf; switch (join) { @@ -730,7 +733,8 @@ Geom::Path half_outline(Geom::Path const& input, double width, double miter, Lin if (u == 0) { res.append(temp); } else { - outline_helper(res, temp, width, miter, join); + bool on_outside = decide(input[u], input[u-1]); + outline_helper(res, temp, width, on_outside, miter, join); if (temp.size() > 0) res.insert(res.end(), ++temp.begin(), temp.end()); } @@ -739,7 +743,8 @@ Geom::Path half_outline(Geom::Path const& input, double width, double miter, Lin if (u < k - 1) { temp = Geom::Path(); offset_curve(temp, &input[u+1], width); - outline_helper(res, temp, width, miter, join); + bool on_outside = decide(input[u], input[u+1]); + outline_helper(res, temp, width, on_outside, miter, join); if (temp.size() > 0) res.insert(res.end(), ++temp.begin(), temp.end()); } @@ -752,7 +757,8 @@ Geom::Path half_outline(Geom::Path const& input, double width, double miter, Lin temp.append(c1); Geom::Path temp2; temp2.append(c2); - outline_helper(temp, temp2, width, miter, join); + bool on_outside = decide(input.back(), input.front()); + outline_helper(temp, temp2, width, on_outside, miter, join); res.erase(res.begin()); res.erase_last(); // |