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MoonTools.Bonk
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Code Issues Pull Requests Releases 4 Wiki Activity

optimize rectangle support function

pull/4/head
Evan Hemsley 2019-12-29 22:54:21 -08:00
parent f9df547302
commit 9e7d16b0a9
1 changed files with 28 additions and 13 deletions
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41
Bonk/Shapes/Rectangle.cs
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@ -38,21 +38,36 @@ namespace MoonTools.Core.Bonk
AABB = new AABB(minX, minY, maxX, maxY);
}
private Vector2 Support(Vector2 direction)
{
if (direction.X >= 0 && direction.Y >= 0)
{
return new Vector2(MaxX, MaxY);
}
else if (direction.X >= 0 && direction.Y < 0)
{
return new Vector2(MaxX, MinY);
}
else if (direction.X < 0 && direction.Y >= 0)
{
return new Vector2(MinX, MaxY);
}
else if (direction.X < 0 && direction.Y < 0)
{
return new Vector2(MinX, MinY);
}
else
{
throw new ArgumentException("Support vector direction cannot be zero.");
}
}
public Vector2 Support(Vector2 direction, Transform2D transform)
{
var maxDotProduct = float.NegativeInfinity;
var maxVertex = new Vector2(MinX, MinY);
foreach (var vertex in Vertices)
{
var transformed = Vector2.Transform(vertex, transform.TransformMatrix);
var dot = Vector2.Dot(transformed, direction);
if (dot > maxDotProduct)
{
maxVertex = transformed;
maxDotProduct = dot;
}
}
return maxVertex;
Matrix4x4 inverseTransform;
Matrix4x4.Invert(transform.TransformMatrix, out inverseTransform);
var inverseDirection = Vector2.TransformNormal(direction, inverseTransform);
return Vector2.Transform(Support(inverseDirection), transform.TransformMatrix);
}
public AABB TransformedAABB(Transform2D transform)