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Made slide and reflect active verbs acting on itself in Vector2 and Vector3.

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This is in alignment with other functions in vector classes.
Also added checks for normalization, fixed the sign of reflect (which now corresponds to reflection along a plane mathematically), added bounce method and updated docs.

Fixes #8201.
This commit is contained in:
Ferenc Arn
2017-03-31 10:25:09 -05:00
parent 6731924dcf
commit 1a620bd5fa
6 changed files with 73 additions and 24 deletions
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24
core/math/math_2d.cpp
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@@ -61,6 +61,10 @@ Vector2 Vector2::normalized() const {
return v;
}
bool Vector2::is_normalized() const {
return Math::isequal_approx(length(), (real_t)1.0);
}
real_t Vector2::distance_to(const Vector2 &p_vector2) const {
return Math::sqrt((x - p_vector2.x) * (x - p_vector2.x) + (y - p_vector2.y) * (y - p_vector2.y));
@@ -274,13 +278,23 @@ Vector2 Vector2::cubic_interpolate(const Vector2 &p_b, const Vector2 &p_pre_a, c
*/
}
Vector2 Vector2::slide(const Vector2 &p_vec) const {
return p_vec - *this * this->dot(p_vec);
// slide returns the component of the vector along the given plane, specified by its normal vector.
Vector2 Vector2::slide(const Vector2 &p_n) const {
#ifdef DEBUG_ENABLED
ERR_FAIL_COND_V(p_n.is_normalized() == false, Vector2());
#endif
return *this - p_n * this->dot(p_n);
}
Vector2 Vector2::reflect(const Vector2 &p_vec) const {
return p_vec - *this * this->dot(p_vec) * 2.0;
Vector2 Vector2::bounce(const Vector2 &p_n) const {
return -reflect(p_n);
}
Vector2 Vector2::reflect(const Vector2 &p_n) const {
#ifdef DEBUG_ENABLED
ERR_FAIL_COND_V(p_n.is_normalized() == false, Vector2());
#endif
return 2.0 * p_n * this->dot(p_n) - *this;
}
bool Rect2::intersects_segment(const Point2 &p_from, const Point2 &p_to, Point2 *r_pos, Point2 *r_normal) const {