diff options
Diffstat (limited to 'scene/2d/line_builder.cpp')
| -rw-r--r-- | scene/2d/line_builder.cpp | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/scene/2d/line_builder.cpp b/scene/2d/line_builder.cpp index e898dc7fab..f8a8aa487c 100644 --- a/scene/2d/line_builder.cpp +++ b/scene/2d/line_builder.cpp @@ -353,7 +353,20 @@ void LineBuilder::build() { } else if (current_joint_mode == Line2D::LINE_JOINT_ROUND && !(wrap_around && i == segments_count)) { Vector2 vbegin = cbegin - pos1; Vector2 vend = cend - pos1; - strip_add_arc(pos1, vbegin.angle_to(vend), orientation); + // We want to use vbegin.angle_to(vend) below, which evaluates to + // Math::atan2(vbegin.cross(vend), vbegin.dot(vend)) but we need to + // calculate this ourselves as we need to check if the cross product + // in that calculation ends up being -0.f and flip it if so, effectively + // flipping the resulting angle_delta to not return -PI but +PI instead + float cross_product = vbegin.cross(vend); + float dot_product = vbegin.dot(vend); + // Note that we're comparing against -0.f for clarity but 0.f would + // match as well, therefore we need the explicit signbit check too. + if (cross_product == -0.f && signbit(cross_product)) { + cross_product = 0.f; + } + float angle_delta = Math::atan2(cross_product, dot_product); + strip_add_arc(pos1, angle_delta, orientation); } if (!is_intersecting) { |