public bool Intersects(RotatedRectangle theRectangle)
{
List<Vector2> aRectangleAxis = new List<Vector2>();
aRectangleAxis.Add(UpperRightCorner() - UpperLeftCorner());
aRectangleAxis.Add(UpperRightCorner() - LowerRightCorner());
aRectangleAxis.Add(theRectangle.UpperLeftCorner() - theRectangle.LowerLeftCorner());
aRectangleAxis.Add(theRectangle.UpperLeftCorner() - theRectangle.UpperRightCorner());
foreach (Vector2 aAxis in aRectangleAxis)
{
if (!IsAxisCollision(theRectangle, aAxis))
{
return false;
}
}
return true;
}
private bool IsAxisCollision(RotatedRectangle theRectangle, Vector2 aAxis)
{
//Project the corners of the Rectangle we are checking on to the Axis and
//get a scalar value of that project we can then use for comparison
List<int> aRectangleAScalars = new List<int>();
aRectangleAScalars.Add(GenerateScalar(theRectangle.UpperLeftCorner(), aAxis));
aRectangleAScalars.Add(GenerateScalar(theRectangle.UpperRightCorner(), aAxis));
aRectangleAScalars.Add(GenerateScalar(theRectangle.LowerLeftCorner(), aAxis));
aRectangleAScalars.Add(GenerateScalar(theRectangle.LowerRightCorner(), aAxis));
//Project the corners of the current Rectangle on to the Axis and
//get a scalar value of that project we can then use for comparison
List<int> aRectangleBScalars = new List<int>();
aRectangleBScalars.Add(GenerateScalar(UpperLeftCorner(), aAxis));
aRectangleBScalars.Add(GenerateScalar(UpperRightCorner(), aAxis));
aRectangleBScalars.Add(GenerateScalar(LowerLeftCorner(), aAxis));
aRectangleBScalars.Add(GenerateScalar(LowerRightCorner(), aAxis));
//Get the Maximum and Minium Scalar values for each of the Rectangles
int aRectangleAMinimum = aRectangleAScalars.Min();
int aRectangleAMaximum = aRectangleAScalars.Max();
int aRectangleBMinimum = aRectangleBScalars.Min();
int aRectangleBMaximum = aRectangleBScalars.Max();
//If we have overlaps between the Rectangles (i.e. Min of B is less than Max of A)
//then we are detecting a collision between the rectangles on this Axis
if (aRectangleBMinimum <= aRectangleAMaximum && aRectangleBMaximum >= aRectangleAMaximum)
{
return true;
}
else if (aRectangleAMinimum <= aRectangleBMaximum && aRectangleAMaximum >= aRectangleBMaximum)
{
return true;
}
return false;
}