22 lines
882 B
C#
22 lines
882 B
C#
using Microsoft.Xna.Framework;
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namespace Barotrauma;
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readonly record struct Triangle2D(Vector2 A, Vector2 B, Vector2 C)
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{
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public bool Contains(Vector2 point)
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{
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// Get the half-plane that the point lands in, for each side of the triangle
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int halfPlaneAb = MathUtils.VectorOrientation(A, B, point);
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int halfPlaneBc = MathUtils.VectorOrientation(B, C, point);
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int halfPlaneCa = MathUtils.VectorOrientation(C, A, point);
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// The intersection of three half-planes derived from the three sides of the triangle
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// is the triangle itself, so check for the point being in those three half-planes
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bool allNonNegative = halfPlaneAb >= 0 && halfPlaneBc >= 0 && halfPlaneCa >= 0;
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bool allNonPositive = halfPlaneAb <= 0 && halfPlaneBc <= 0 && halfPlaneCa <= 0;
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return allNonNegative || allNonPositive;
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}
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}
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