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Merge pull request #16495 from Chaosus/is_point_in_triangle_fix

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Fix is_point_in_triangle function
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Juan Linietsky 2018-04-08 18:18:19 -03:00 committed by GitHub
commit cef01f1f49
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1 changed files with 6 additions and 7 deletions
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13
core/math/geometry.h
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@ -502,16 +502,15 @@ public:
}
static bool is_point_in_triangle(const Vector2 &s, const Vector2 &a, const Vector2 &b, const Vector2 &c) {
int as_x = s.x - a.x;
int as_y = s.y - a.y;
Vector2 an = a - s;
Vector2 bn = b - s;
Vector2 cn = c - s;
bool s_ab = (b.x - a.x) * as_y - (b.y - a.y) * as_x > 0;
bool orientation = an.cross(bn) > 0;
if (((c.x - a.x) * as_y - (c.y - a.y) * as_x > 0) == s_ab) return false;
if ((bn.cross(cn) > 0) != orientation) return false;
if (((c.x - b.x) * (s.y - b.y) - (c.y - b.y) * (s.x - b.x) > 0) != s_ab) return false;
return true;
return (cn.cross(an) > 0) == orientation;
}
static bool is_point_in_polygon(const Vector2 &p_point, const Vector<Vector2> &p_polygon);