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MoonTools.Bonk
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fix issue where shape-transforms with same values clobber each other in spatial hash

generics
thatcosmonaut 2019-09-18 17:00:28 -07:00
parent ab79a60ab4
commit e292ad1875
2 changed files with 36 additions and 15 deletions
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30
Bonk/BroadPhase/SpatialHash.cs
View File

@ -8,22 +8,22 @@ namespace MoonTools.Core.Bonk
{
private readonly int cellSize;
private readonly Dictionary<int, Dictionary<int, HashSet<(IShape2D, Transform2D)>>> hashDictionary = new Dictionary<int, Dictionary<int, HashSet<(IShape2D, Transform2D)>>>();
private readonly Dictionary<(IShape2D, Transform2D), T> IDLookup = new Dictionary<(IShape2D, Transform2D), T>();
private readonly Dictionary<int, Dictionary<int, HashSet<T>>> hashDictionary = new Dictionary<int, Dictionary<int, HashSet<T>>>();
private readonly Dictionary<T, (IShape2D, Transform2D)> IDLookup = new Dictionary<T, (IShape2D, Transform2D)>();
public SpatialHash(int cellSize)
{
this.cellSize = cellSize;
}
private (int, int) Hash(int x, int y)
private (int, int) Hash(float x, float y)
{
return ((int)Math.Floor((float)x / cellSize), (int)Math.Floor((float)y / cellSize));
return ((int)Math.Floor(x / cellSize), (int)Math.Floor(y / cellSize));
}
public void Insert(T id, IShape2D shape, Transform2D Transform2D)
public void Insert(T id, IShape2D shape, Transform2D transform2D)
{
var box = shape.AABB(Transform2D);
var box = shape.AABB(transform2D);
var minHash = Hash(box.MinX, box.MinY);
var maxHash = Hash(box.MaxX, box.MaxY);
@ -33,23 +33,23 @@ namespace MoonTools.Core.Bonk
{
if (!hashDictionary.ContainsKey(i))
{
hashDictionary.Add(i, new Dictionary<int, HashSet<(IShape2D, Transform2D)>>());
hashDictionary.Add(i, new Dictionary<int, HashSet<T>>());
}
if (!hashDictionary[i].ContainsKey(j))
{
hashDictionary[i].Add(j, new HashSet<(IShape2D, Transform2D)>());
hashDictionary[i].Add(j, new HashSet<T>());
}
hashDictionary[i][j].Add((shape, Transform2D));
IDLookup[(shape, Transform2D)] = id;
hashDictionary[i][j].Add(id);
IDLookup[id] = (shape, transform2D);
}
}
}
public IEnumerable<(T, IShape2D, Transform2D)> Retrieve(T id, IShape2D shape, Transform2D Transform2D)
public IEnumerable<(T, IShape2D, Transform2D)> Retrieve(T id, IShape2D shape, Transform2D transform2D)
{
var box = shape.AABB(Transform2D);
var box = shape.AABB(transform2D);
var minHash = Hash(box.MinX, box.MinY);
var maxHash = Hash(box.MaxX, box.MaxY);
@ -59,10 +59,10 @@ namespace MoonTools.Core.Bonk
{
if (hashDictionary.ContainsKey(i) && hashDictionary[i].ContainsKey(j))
{
foreach (var (otherShape, otherTransform2D) in hashDictionary[i][j])
foreach (var t in hashDictionary[i][j])
{
var otherID = IDLookup[(otherShape, otherTransform2D)];
if (!id.Equals(otherID)) { yield return (otherID, otherShape, otherTransform2D); }
var (otherShape, otherTransform) = IDLookup[t];
if (!id.Equals(t)) { yield return (t, otherShape, otherTransform); }
}
}
}

21
Test/SpatialHashTest.cs
View File

@ -53,6 +53,27 @@ namespace Tests
spatialHash.Retrieve(6, line, lineTransform).Should().Contain((4, circleA, circleATransform)).And.Contain((2, rectC, rectCTransform));
}
[Test]
public void InsertAndRetrieveSameValues()
{
var spatialHash = new SpatialHash<int>(16);
var rectA = new MoonTools.Core.Bonk.Rectangle(-2, -2, 2, 2);
var rectATransform = new Transform2D(new Vector2(-8, -8));
var rectB = new MoonTools.Core.Bonk.Rectangle(-2, -2, 2, 2);
var rectBTransform = new Transform2D(new Vector2(-8, -8));
var rectC = new MoonTools.Core.Bonk.Rectangle(-1, -1, 1, 1);
var rectCTransform = new Transform2D(new Vector2(-8, -8));
spatialHash.Insert(0, rectA, rectATransform);
spatialHash.Insert(1, rectB, rectBTransform);
spatialHash.Insert(2, rectC, rectCTransform);
spatialHash.Retrieve(2, rectC, rectCTransform).Should().HaveCount(2);
}
[Test]
public void Clear()
{