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Move rotation sampling from Path2D to Curve2D

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The rotation sampling code is moved from Path2D to a new method
`sample_baked_with_rotation` on Curve2D.
This commit is contained in:
Yaohua Xiong
2022-08-05 17:03:00 +08:00
parent c29fe310f1
commit 399c2a8dea
4 changed files with 64 additions and 39 deletions
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41
scene/resources/curve.cpp
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@@ -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);