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Rectangle extents are rotated correctly

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This commit is contained in:
Andreas Torebring
2022-08-26 13:40:31 +02:00
parent 423c80df5f
commit b2759175b6
2 changed files with 59 additions and 6 deletions
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src/cs/MonoGame.Extended/Math/PrimitivesHelper.cs
+6 -6
View File
@@ -65,10 +65,10 @@ namespace MonoGame.Extended
// Real-Time Collision Detection, Christer Ericson, 2005. Chapter 4.2; Bounding Volumes - Axis-aligned Bounding Boxes (AABBs). pg 86-87
center = transformMatrix.Transform(center);
halfExtents.X = halfExtents.X * Math.Abs(transformMatrix.M11) + halfExtents.X * Math.Abs(transformMatrix.M12) +
halfExtents.X * Math.Abs(transformMatrix.M31);
halfExtents.Y = halfExtents.Y * Math.Abs(transformMatrix.M21) + halfExtents.Y * Math.Abs(transformMatrix.M22) +
halfExtents.Y * Math.Abs(transformMatrix.M32);
var xRadius = halfExtents.X;
var yRadius = halfExtents.Y;
halfExtents.X = xRadius * Math.Abs(transformMatrix.M11) + yRadius * Math.Abs(transformMatrix.M12);
halfExtents.Y = xRadius * Math.Abs(transformMatrix.M21) + yRadius * Math.Abs(transformMatrix.M22);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -109,7 +109,7 @@ namespace MonoGame.Extended
internal static void ClosestPointToPointFromRectangle(Point2 minimum, Point2 maximum, Point2 point, out Point2 result)
{
// Real-Time Collision Detection, Christer Ericson, 2005. Chapter 5.1.2; Basic Primitive Tests - Closest-point Computations. pg 130-131
result = point;
// For each coordinate axis, if the point coordinate value is outside box, clamp it to the box, else keep it as is
@@ -125,4 +125,4 @@ namespace MonoGame.Extended
}
}
}
}
src/cs/Tests/MonoGame.Extended.Tests/Primitives/RectangleFTests.cs
+53
View File
@@ -77,6 +77,59 @@ namespace MonoGame.Extended.Tests.Primitives
Assert.Equal(new Size2(20, 30), result.Size);
}
[Fact]
public void Applies_rotation_and_translation()
{
/* Rectangle with center point aligned in coordinate system with origin 0.
*
* :
* :
* +-+
* | |
* |p|
* | |
* ...............0-+............
* :
* :
* :
*
* Rotate center point p, 90 degrees around origin 0.
*
* :
* :
* +---+
* | p |
* ...........+---0..............
* :
* :
* :
*
* Then translate rectangle by x=10 and y=20.
* :
* : +---+
* : | p |
* y=21 - - - - - - - -> +---+
* .
* :
* ...............0..............
* :
* :
* :
*/
var rectangle = new RectangleF(new Point2(0, 0), new Size2(2, 4));
var transform =
Matrix2.CreateRotationZ(MathHelper.PiOver2)
*
Matrix2.CreateTranslation(10, 20);
var result = RectangleF.Transform(rectangle, ref transform);
Assert.Equal(-2 + 10, result.Center.X, 6);
Assert.Equal(1 + 20, result.Center.Y, 6);
Assert.Equal(4, result.Size.Width, 6);
Assert.Equal(2, result.Size.Height, 6);
}
}
}
}