diff options
| -rw-r--r-- | vcl/opengl/gdiimpl.cxx | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/vcl/opengl/gdiimpl.cxx b/vcl/opengl/gdiimpl.cxx index d3d6392bf96c..0c107da49abc 100644 --- a/vcl/opengl/gdiimpl.cxx +++ b/vcl/opengl/gdiimpl.cxx @@ -682,6 +682,8 @@ inline glm::vec2 normalize(const glm::vec2& vector) return vector; } +SAL_CONSTEXPR float constMiterMinimumAngle = 15.0f; + } // end anonymous namespace void OpenGLSalGraphicsImpl::DrawLineCap(float x1, float y1, float x2, float y2, css::drawing::LineCap eLineCap, float fLineWidth) @@ -864,6 +866,17 @@ void OpenGLSalGraphicsImpl::DrawPolyLine(const basegfx::B2DPolygon& rPolygon, fl if (eLineJoin == basegfx::B2DLineJoin::Miter) { + float angle = std::atan2(previousLineVector.x * nextLineVector.y - previousLineVector.y * nextLineVector.x, + previousLineVector.x * nextLineVector.x + previousLineVector.y * nextLineVector.y); + + angle = (F_PI - std::fabs(angle)) / F_PI180; + + if (angle < constMiterMinimumAngle) + eLineJoin = basegfx::B2DLineJoin::Bevel; + } + + if (eLineJoin == basegfx::B2DLineJoin::Miter) + { // With miter join we calculate the extrusion vector by adding normals of // previous and next line segment. The vector shows the way but we also // need the length (otherwise the line will be deformed). Length factor is |