Unstable 1.2.4.0
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@@ -139,17 +139,17 @@ namespace Barotrauma
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return new Rectangle(rect.X - amount, rect.Y + amount, rect.Width + amount * 2, rect.Height + amount * 2);
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}
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public static int VectorOrientation(Vector2 p1, Vector2 p2, Vector2 p)
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/// <summary>
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/// Given three points A, B and C,
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/// returns 1 if AC is oriented clockwise relative to AB,
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/// -1 if AC is oriented counter-clockwise relative to AB,
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/// or 0 if A, B and C are collinear.
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/// </summary>
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public static int VectorOrientation(Vector2 pointA, Vector2 pointB, Vector2 pointC)
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{
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// Determinant
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float Orin = (p2.X - p1.X) * (p.Y - p1.Y) - (p.X - p1.X) * (p2.Y - p1.Y);
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float determinant = (pointB.X - pointA.X) * (pointC.Y - pointA.Y) - (pointC.X - pointA.X) * (pointB.Y - pointA.Y);
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if (Orin > 0)
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return -1; // (* Orientation is to the left-hand side *)
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if (Orin < 0)
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return 1; // (* Orientation is to the right-hand side *)
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return 0; // (* Orientation is neutral aka collinear *)
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return -Math.Sign(determinant);
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}
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@@ -1091,11 +1091,11 @@ namespace Barotrauma
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}
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}
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class CompareCCW : IComparer<Vector2>
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class CompareCW : IComparer<Vector2>
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{
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private Vector2 center;
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public CompareCCW(Vector2 center)
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public CompareCW(Vector2 center)
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{
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this.center = center;
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}
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@@ -1106,25 +1106,43 @@ namespace Barotrauma
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public static int Compare(Vector2 a, Vector2 b, Vector2 center)
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{
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if (a == b) return 0;
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if (a.X - center.X >= 0 && b.X - center.X < 0) return -1;
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if (a.X - center.X < 0 && b.X - center.X >= 0) return 1;
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if (a == b) { return 0; }
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if (a.X - center.X >= 0 && b.X - center.X < 0) { return 1; }
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if (a.X - center.X < 0 && b.X - center.X >= 0) { return -1; }
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if (a.X - center.X == 0 && b.X - center.X == 0)
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{
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if (a.Y - center.Y >= 0 || b.Y - center.Y >= 0) return Math.Sign(b.Y - a.Y);
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if (a.Y - center.Y >= 0 || b.Y - center.Y >= 0) { return Math.Sign(a.Y - b.Y); }
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return Math.Sign(a.Y - b.Y);
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}
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// compute the cross product of vectors (center -> a) x (center -> b)
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float det = (a.X - center.X) * (b.Y - center.Y) - (b.X - center.X) * (a.Y - center.Y);
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if (det < 0) return -1;
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if (det > 0) return 1;
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if (det < 0) { return 1; }
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if (det > 0) { return -1; }
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// points a and b are on the same line from the center
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// check which point is closer to the center
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float d1 = (a.X - center.X) * (a.X - center.X) + (a.Y - center.Y) * (a.Y - center.Y);
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float d2 = (b.X - center.X) * (b.X - center.X) + (b.Y - center.Y) * (b.Y - center.Y);
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return Math.Sign(d2 - d1);
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return Math.Sign(d1 - d2);
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}
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}
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class CompareCCW : IComparer<Vector2>
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{
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private Vector2 center;
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public CompareCCW(Vector2 center)
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{
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this.center = center;
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}
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public int Compare(Vector2 a, Vector2 b)
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{
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return -CompareCW.Compare(a, b, center);
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}
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public static int Compare(Vector2 a, Vector2 b, Vector2 center)
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{
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return -CompareCW.Compare(a, b, center);
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}
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}
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}
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