diff options
Diffstat (limited to 'scene/resources/curve.cpp')
| -rw-r--r-- | scene/resources/curve.cpp | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/scene/resources/curve.cpp b/scene/resources/curve.cpp index 49b78a091d..eda9af9dde 100644 --- a/scene/resources/curve.cpp +++ b/scene/resources/curve.cpp @@ -936,6 +936,46 @@ Vector2 Curve2D::sample_baked(real_t p_offset, bool p_cubic) const { } } +Transform2D Curve2D::sample_baked_with_rotation(real_t p_offset, bool p_cubic, bool p_loop, real_t p_lookahead) const { + real_t path_length = get_baked_length(); // Ensure baked. + ERR_FAIL_COND_V_MSG(path_length == 0, Transform2D(), "Length of Curve2D is 0."); + + Vector2 pos = sample_baked(p_offset, p_cubic); + + real_t ahead = p_offset + p_lookahead; + + if (p_loop && ahead >= path_length) { + // If our lookahead will loop, we need to check if the path is closed. + int point_count = get_point_count(); + if (point_count > 0) { + Vector2 start_point = get_point_position(0); + Vector2 end_point = get_point_position(point_count - 1); + if (start_point == end_point) { + // Since the path is closed we want to 'smooth off' + // the corner at the start/end. + // So we wrap the lookahead back round. + ahead = Math::fmod(ahead, path_length); + } + } + } + + Vector2 ahead_pos = sample_baked(ahead, p_cubic); + + Vector2 tangent_to_curve; + if (ahead_pos == pos) { + // This will happen at the end of non-looping or non-closed paths. + // We'll try a look behind instead, in order to get a meaningful angle. + tangent_to_curve = + (pos - sample_baked(p_offset - p_lookahead, p_cubic)).normalized(); + } else { + tangent_to_curve = (ahead_pos - pos).normalized(); + } + + Vector2 normal_of_curve = -tangent_to_curve.orthogonal(); + + return Transform2D(normal_of_curve, tangent_to_curve, pos); +} + PackedVector2Array Curve2D::get_baked_points() const { if (baked_cache_dirty) { _bake(); @@ -1184,6 +1224,7 @@ void Curve2D::_bind_methods() { ClassDB::bind_method(D_METHOD("get_baked_length"), &Curve2D::get_baked_length); ClassDB::bind_method(D_METHOD("sample_baked", "offset", "cubic"), &Curve2D::sample_baked, DEFVAL(false)); + ClassDB::bind_method(D_METHOD("sample_baked_with_rotation", "offset", "cubic", "loop", "lookahead"), &Curve2D::sample_baked_with_rotation, DEFVAL(false), DEFVAL(true), DEFVAL(4.0)); ClassDB::bind_method(D_METHOD("get_baked_points"), &Curve2D::get_baked_points); ClassDB::bind_method(D_METHOD("get_closest_point", "to_point"), &Curve2D::get_closest_point); ClassDB::bind_method(D_METHOD("get_closest_offset", "to_point"), &Curve2D::get_closest_offset); |