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Add enumerator for box2i edges (#3834)

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Will write a test later don't @ me.
This commit is contained in:
metalgearsloth
2023-03-10 09:03:29 +11:00
committed by GitHub
parent 460b7c9804
commit 8a827b37e6
1 changed files with 60 additions and 0 deletions
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60
Robust.Shared.Maths/Box2i.cs
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@@ -167,4 +167,64 @@ namespace Robust.Shared.Maths
Top * scalar);
}
}
/// <summary>
/// Iterates neighbouring tiles to a box2i.
/// </summary>
public struct Box2iEdgeEnumerator
{
private readonly bool _corners;
private readonly Box2i _box;
private readonly int _offset;
private int _x;
private int _y;
public Box2iEdgeEnumerator(Box2i box, bool corners, int offset = 1)
{
_box = box;
_corners = corners;
_x = _box.Left - offset;
_y = _box.Bottom - offset;
_offset = offset;
}
public bool MoveNext(out Vector2i index)
{
for (var x = _x; x < _box.Right + _offset; x++)
{
for (var y = _y; y < _box.Top + _offset; y++)
{
if (x != _box.Left - _offset &&
x != _box.Right + (_offset - 1) &&
y != _box.Bottom - _offset &&
y != _box.Top + (_offset - 1))
{
continue;
}
if (!_corners &&
(x == _box.Left - _offset && (y == _box.Bottom - _offset || y == _box.Top + (_offset - 1)) ||
x == _box.Right && (y == _box.Bottom - _offset || y == _box.Top + (_offset - 1))))
{
continue;
}
_x = x;
_y = y + 1;
if (_y == _box.Top + _offset)
{
_x++;
_y = _box.Bottom - _offset;
}
index = new Vector2i(x, y);
return true;
}
}
index = default;
return false;
}
}
}