MoonTools.Bonk/Test/EPA2DTest.cs

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using NUnit.Framework;
using FluentAssertions;
using Microsoft.Xna.Framework;
using System;
using MoonTools.Core.Structs;
using MoonTools.Core.Bonk;
namespace Tests
{
public class EPA2DTest
{
[Test]
public void RectangleOverlap()
{
var squareA = new MoonTools.Core.Bonk.Rectangle(-1, -1, 1, 1);
var transformA = Transform2D.DefaultTransform;
var squareB = new MoonTools.Core.Bonk.Rectangle(-1, -1, 1, 1);
var transformB = new Transform2D(new Vector2(1.5f, 0));
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var (result, simplex) = GJK2D.FindCollisionSimplex(squareA, transformA, squareB, transformB);
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result.Should().BeTrue();
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var intersection = EPA2D.Intersect(squareA, transformA, squareB, transformB, simplex);
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intersection.X.Should().Be(1f);
intersection.Y.Should().Be(0);
}
[Test]
public void CircleOverlap()
{
var circleA = new Circle(2);
var transformA = Transform2D.DefaultTransform;
var circleB = new Circle(1);
var transformB = new Transform2D(new Vector2(1, 1));
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var (result, simplex) = GJK2D.FindCollisionSimplex(circleA, transformA, circleB, transformB);
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result.Should().BeTrue();
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var intersection = EPA2D.Intersect(circleA, transformA, circleB, transformB, simplex);
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var ix = circleA.Radius * (float)Math.Cos(Math.PI / 4) - (circleB.Radius * (float)Math.Cos(5 * Math.PI / 4) + transformB.Position.X);
var iy = circleA.Radius * (float)Math.Sin(Math.PI / 4) - (circleB.Radius * (float)Math.Sin(5 * Math.PI / 4) + transformB.Position.Y);
intersection.X.Should().BeApproximately(ix, 0.01f);
intersection.Y.Should().BeApproximately(iy, 0.01f);
}
[Test]
public void LineRectangleOverlap()
{
var line = new Line(new Position2D(-4, -4), new Position2D(4, 4));
var transformA = Transform2D.DefaultTransform;
var square = new MoonTools.Core.Bonk.Rectangle(-1, -1, 1, 1);
var transformB = Transform2D.DefaultTransform;
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var (result, simplex) = GJK2D.FindCollisionSimplex(line, transformA, square, transformB);
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result.Should().BeTrue();
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var intersection = EPA2D.Intersect(line, transformA, square, transformB, simplex);
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intersection.X.Should().Be(-1);
intersection.Y.Should().Be(1);
}
}
}