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using System;
using Microsoft.Xna.Framework;
using Xunit;
namespace MonoGame.Extended.Collisions.Tests
{
using MonoGame.Extended.Collisions.Layers;
/// <summary>
/// Test collision of actors with various shapes.
/// </summary>
/// <remarks>
/// Uses the fact that <see cref="BasicActor"/> moves itself away from
/// <see cref="BasicWall"/> on collision.
/// </remarks>
public class CollisionComponentTests
{
private readonly CollisionComponent _collisionComponent;
private readonly GameTime _gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromMilliseconds(16));
public CollisionComponentTests()
{
_collisionComponent = new CollisionComponent(new RectangleF(Point2.Zero, new Point2(10, 10)));
}
#region Circle Circle
[Fact]
public void PenetrationVectorSameCircleTest()
{
Point2 pos1 = Point2.Zero;
Point2 pos2 = Point2.Zero;
IShapeF shape1 = new CircleF(pos1, 2.0f);
IShapeF shape2 = new CircleF(pos2, 2.0f);
var actor1 = new BasicActor()
{
Position = pos1,
Bounds = shape1
};
var actor2 = new BasicWall()
{
Position = pos2,
Bounds = shape2
};
Assert.True(shape1.Intersects(shape2));
_collisionComponent.Insert(actor1);
_collisionComponent.Insert(actor2);
_collisionComponent.Update(_gameTime);
Assert.True(Math.Abs(actor1.Position.Y - -4f) < float.Epsilon);
}
[Fact]
public void PenetrationVectorSlightlyOverlappingCircleTest()
{
Point2 pos1 = new Point2(0, 1.5f);
Point2 pos2 = Point2.Zero;
IShapeF shape1 = new CircleF(pos1, 2.0f);
IShapeF shape2 = new CircleF(pos2, 2.0f);
var actor1 = new BasicActor()
{
Position = pos1,
Bounds = shape1
};
var actor2 = new BasicWall()
{
Position = pos2,
Bounds = shape2
};
Assert.True(shape1.Intersects(shape2));
_collisionComponent.Insert(actor1);
_collisionComponent.Insert(actor2);
_collisionComponent.Update(_gameTime);
// Actor should have moved up because the distance is shorter.
Assert.True(actor1.Position.Y > actor2.Position.Y);
// The circle centers should be about 4 units away after moving
Assert.True(Math.Abs(actor1.Position.Y - 4.0f) < float.Epsilon);
}
[Fact]
public void PenetrationVectorSlightlyOverlappingOffAxisTest()
{
Point2 pos1 = new Point2(2, 2.5f);
Point2 pos2 = new Point2(2, 1);
IShapeF shape1 = new CircleF(pos1, 2.0f);
IShapeF shape2 = new CircleF(pos2, 2.0f);
var actor1 = new BasicActor()
{
Position = pos1,
Bounds = shape1
};
var actor2 = new BasicWall()
{
Position = pos2,
Bounds = shape2
};
Assert.True(shape1.Intersects(shape2));
_collisionComponent.Insert(actor1);
_collisionComponent.Insert(actor2);
_collisionComponent.Update(_gameTime);
// Actor should have moved up because the distance is shorter.
Assert.True(actor1.Position.Y > actor2.Position.Y);
// The circle centers should be about 4 units away after moving
Assert.True(Math.Abs(actor1.Position.Y - 5.0f) < float.Epsilon);
Assert.True(Math.Abs(actor1.Position.X - 2.0f) < float.Epsilon);
}
[Fact]
public void PenetrationZeroRadiusCircleCircleTest()
{
Point2 pos1 = new Point2(0, 1.5f);
Point2 pos2 = Point2.Zero;
IShapeF shape1 = new CircleF(pos1, 0);
IShapeF shape2 = new CircleF(pos2, 2.0f);
var actor1 = new BasicActor()
{
Position = pos1,
Bounds = shape1
};
var actor2 = new BasicWall()
{
Position = pos2,
Bounds = shape2
};
Assert.True(shape1.Intersects(shape2));
_collisionComponent.Insert(actor1);
_collisionComponent.Insert(actor2);
_collisionComponent.Update(_gameTime);
// Actor should have moved up because the distance is shorter.
Assert.True(actor1.Position.Y > actor2.Position.Y);
// The circle centers should be about 4 units away after moving
// Assert.True(Math.Abs(actor1.Position.Y - 2.0f) < float.Epsilon);
}
#endregion
#region Circle Rectangle
[Fact]
public void PenetrationVectorCircleRectangleTest()
{
Point2 pos1 = new Point2(0, 1);
Point2 pos2 = new Point2(-2, -1);
IShapeF shape1 = new CircleF(pos1, 2.0f);
IShapeF shape2 = new RectangleF(pos2, new Size2(4, 2));
var actor1 = new BasicActor()
{
Position = pos1,
Bounds = shape1
};
var actor2 = new BasicWall()
{
Position = pos2,
Bounds = shape2
};
Assert.True(shape1.Intersects(shape2));
_collisionComponent.Insert(actor1);
_collisionComponent.Insert(actor2);
_collisionComponent.Update(_gameTime);
Assert.True(Math.Abs(actor1.Position.X - 0.0f) < float.Epsilon);
Assert.True(Math.Abs(actor1.Position.Y - 3.0f) < float.Epsilon);
}
[Fact]
public void PenetrationVectorCircleContainedInRectangleTest()
{
Point2 pos1 = new Point2(0, 0);
Point2 pos2 = new Point2(-2, -1);
IShapeF shape1 = new CircleF(pos1, 1.0f);
IShapeF shape2 = new RectangleF(pos2, new Size2(4, 2));
var actor1 = new BasicActor()
{
Position = pos1,
Bounds = shape1
};
var actor2 = new BasicWall()
{
Position = pos2,
Bounds = shape2
};
Assert.True(shape1.Intersects(shape2));
_collisionComponent.Insert(actor1);
_collisionComponent.Insert(actor2);
_collisionComponent.Update(_gameTime);
Assert.True(Math.Abs(actor1.Position.X - 0.0f) < float.Epsilon);
Assert.True(Math.Abs(actor1.Position.Y - -2.0f) < float.Epsilon);
}
[Fact]
public void PenetrationVectorCircleOffAxisRectangleTest()
{
Point2 pos1 = new Point2(2, 1);
Point2 pos2 = new Point2(-2, -1);
IShapeF shape1 = new CircleF(pos1, 2.0f);
IShapeF shape2 = new RectangleF(pos2, new Size2(4, 2));
var actor1 = new BasicActor()
{
Position = pos1,
Bounds = shape1
};
var actor2 = new BasicWall()
{
Position = pos2,
Bounds = shape2
};
Assert.True(shape1.Intersects(shape2));
_collisionComponent.Insert(actor1);
_collisionComponent.Insert(actor2);
_collisionComponent.Update(_gameTime);
Assert.True(Math.Abs(actor1.Position.X - 2.0f) < float.Epsilon);
Assert.True(Math.Abs(actor1.Position.Y - 3.0f) < float.Epsilon);
}
#endregion
#region Rectangle Rectangle
[Fact]
public void PenetrationVectorRectangleRectangleTest()
{
Point2 pos1 = new Point2(0, 0);
Point2 pos2 = new Point2(-2, -1);
IShapeF shape1 = new RectangleF(pos1, new Size2(4, 2));
IShapeF shape2 = new RectangleF(pos2, new Size2(4, 2));
var actor1 = new BasicActor()
{
Position = pos1,
Bounds = shape1
};
var actor2 = new BasicWall()
{
Position = pos2,
Bounds = shape2
};
Assert.True(shape1.Intersects(shape2));
_collisionComponent.Insert(actor1);
_collisionComponent.Insert(actor2);
_collisionComponent.Update(_gameTime);
Assert.True(Math.Abs(actor1.Position.X - 0.0f) < float.Epsilon);
Assert.True(Math.Abs(actor1.Position.Y - 1.0f) < float.Epsilon);
}
[Fact]
public void PenetrationVectorRectangleRectangleOffAxisTest()
{
Point2 pos1 = new Point2(4, 2);
Point2 pos2 = new Point2(3, 1);
IShapeF shape1 = new RectangleF(pos1, new Size2(4, 2));
IShapeF shape2 = new RectangleF(pos2, new Size2(4, 2));
var actor1 = new BasicActor()
{
Position = pos1,
Bounds = shape1
};
var actor2 = new BasicWall()
{
Position = pos2,
Bounds = shape2
};
Assert.True(shape1.Intersects(shape2));
_collisionComponent.Insert(actor1);
_collisionComponent.Insert(actor2);
_collisionComponent.Update(_gameTime);
Assert.True(Math.Abs(actor1.Position.X - 4.0f) < float.Epsilon);
Assert.True(Math.Abs(actor1.Position.Y - 3.0f) < float.Epsilon);
}
#endregion
public class Behaviours : CollisionComponentTests
{
[Fact]
public void Actors_is_colliding()
{
var staticBounds = new RectangleF(new Point2(0, 0), new Size2(1, 1));
var anotherStaticBounds = new RectangleF(new Point2(0, 0), new Size2(1, 1));
var staticActor = new CollisionIndicatingActor(staticBounds);
var anotherStaticActor = new CollisionIndicatingActor(anotherStaticBounds);
_collisionComponent.Insert(staticActor);
_collisionComponent.Insert(anotherStaticActor);
_collisionComponent.Update(_gameTime);
Assert.True(staticActor.IsColliding);
Assert.True(anotherStaticActor.IsColliding);
}
[Fact]
public void Actors_is_not_colliding_when_dynamic_actor_is_moved_out_of_collision_bounds()
{
var staticBounds = new RectangleF(new Point2(0, 0), new Size2(1, 1));
var dynamicBounds = new RectangleF(new Point2(0, 0), new Size2(1, 1));
var staticActor = new CollisionIndicatingActor(staticBounds);
var dynamicActor = new CollisionIndicatingActor(dynamicBounds);
_collisionComponent.Insert(staticActor);
_collisionComponent.Insert(dynamicActor);
dynamicActor.MoveTo(new Point2(2, 2));
_collisionComponent.Update(_gameTime);
Assert.False(staticActor.IsColliding);
Assert.False(dynamicActor.IsColliding);
}
[Fact]
public void Actors_is_colliding_when_dynamic_actor_is_moved_after_update()
{
var staticBounds = new RectangleF(new Point2(0, 0), new Size2(1, 1));
var staticActor = new CollisionIndicatingActor(staticBounds);
_collisionComponent.Insert(staticActor);
for (int i = 0; i < QuadTree.QuadTree.DefaultMaxObjectsPerNode; i++)
{
var fillerBounds = new RectangleF(new Point2(0, 2), new Size2(.1f, .1f));
var fillerActor = new CollisionIndicatingActor(fillerBounds);
_collisionComponent.Insert(fillerActor);
}
var dynamicBounds = new RectangleF(new Point2(2, 2), new Size2(1, 1));
var dynamicActor = new CollisionIndicatingActor(dynamicBounds);
_collisionComponent.Insert(dynamicActor);
_collisionComponent.Update(_gameTime);
Assert.False(staticActor.IsColliding);
Assert.False(dynamicActor.IsColliding);
dynamicActor.MoveTo(new Point2(0, 0));
_collisionComponent.Update(_gameTime);
Assert.True(dynamicActor.IsColliding);
Assert.True(staticActor.IsColliding);
}
[Fact]
public void Actors_is_colliding_when_dynamic_actor_is_moved_into_collision_bounds()
{
var staticBounds = new RectangleF(new Point2(0, 0), new Size2(1, 1));
var dynamicBounds = new RectangleF(new Point2(2, 2), new Size2(1, 1));
var staticActor = new CollisionIndicatingActor(staticBounds);
var dynamicActor = new CollisionIndicatingActor(dynamicBounds);
_collisionComponent.Insert(staticActor);
_collisionComponent.Insert(dynamicActor);
dynamicActor.MoveTo(new Point2(0, 0));
_collisionComponent.Update(_gameTime);
Assert.True(staticActor.IsColliding);
Assert.True(dynamicActor.IsColliding);
}
[Fact]
public void InsertActor_ThrowsUndefinedLayerException_IfThereIsNoLayerDefined()
{
var sut = new CollisionComponent();
var act = () => sut.Insert(new CollisionIndicatingActor(RectangleF.Empty));
Assert.Throws<UndefinedLayerException>(act);
}
private class CollisionIndicatingActor : ICollisionActor
{
private RectangleF _bounds;
public CollisionIndicatingActor(RectangleF bounds)
{
_bounds = bounds;
}
public IShapeF Bounds => _bounds;
public void OnCollision(CollisionEventArgs collisionInfo)
{
IsColliding = true;
}
public bool IsColliding { get; private set; }
public void MoveTo(Point2 position)
{
_bounds = new RectangleF(position, _bounds.Size);
}
}
}
}
}
|
