public void RotationMatrixTest()
{
RectanglePolygon testRect = new RectanglePolygon(new Point(100, 100), new Point(300, 100), new Point(300, 200), new Point(100, 200));
double expectedAngle = 0d;
Assert.Equal(expectedAngle, testRect.Angle);
Matrix matrix = MatrixFactory.CreateRotationMatrix(90, testRect.Center);
Point[] rectPoints = new[] { testRect.TopLeft, testRect.TopRight, testRect.BottomRight, testRect.BottomLeft };
matrix.Transform(rectPoints);
testRect = new RectanglePolygon(rectPoints[0], rectPoints[1], rectPoints[2], rectPoints[3]);
expectedAngle = 90d;
Assert.Equal(expectedAngle, testRect.Angle);
matrix = MatrixFactory.CreateRotationMatrix(-45, testRect.Center);
rectPoints = new[] { testRect.TopLeft, testRect.TopRight, testRect.BottomRight, testRect.BottomLeft };
matrix.Transform(rectPoints);
testRect = new RectanglePolygon(rectPoints[0], rectPoints[1], rectPoints[2], rectPoints[3]);
expectedAngle = 45d;
Assert.Equal(expectedAngle, testRect.Angle);
}
