//Check to see if two Rotated Rectangles have collided
public bool Intersects(RotatedRectangle theRectangle)
{
//calculate the axis we will us to check collisions on
//make 4, one for each side
List<Vector2> rectangleAxis = new List<Vector2>();
rectangleAxis.Add(UpperRightCorner() - UpperLeftCorner());
rectangleAxis.Add(UpperRightCorner() - LowerRightCorner());
rectangleAxis.Add(theRectangle.UpperLeftCorner() - theRectangle.LowerLeftCorner());
rectangleAxis.Add(theRectangle.UpperLeftCorner() - theRectangle.UpperRightCorner());
//loop through each axis, if one of them does not collide then there is no collision
foreach (Vector2 axis in rectangleAxis)
{
if (!IsAxisCollision(theRectangle, axis))
{
return false;
}
}
return true;
}
//Check to see if two Rotated Rectangles have collided
public bool Intersects(RotatedRectangle theRectangle)
{
//calculate the axis we will us to check collisions on
//make 4, one for each side
List <Vector2> rectangleAxis = new List <Vector2>();
rectangleAxis.Add(UpperRightCorner() - UpperLeftCorner());
rectangleAxis.Add(UpperRightCorner() - LowerRightCorner());
rectangleAxis.Add(theRectangle.UpperLeftCorner() - theRectangle.LowerLeftCorner());
rectangleAxis.Add(theRectangle.UpperLeftCorner() - theRectangle.UpperRightCorner());
//loop through each axis, if one of them does not collide then there is no collision
foreach (Vector2 axis in rectangleAxis)
{
if (!IsAxisCollision(theRectangle, axis))
{
return(false);
}
}
return(true);
}
//Determines if a collision has occurred on an Axis of one of the planes parallel to the Rectangle
private bool IsAxisCollision(RotatedRectangle theRectangle, Vector2 axis)
{
//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> rectangleAScalars = new List <int>();
rectangleAScalars.Add(GenerateScalar(theRectangle.UpperLeftCorner(), axis));
rectangleAScalars.Add(GenerateScalar(theRectangle.UpperRightCorner(), axis));
rectangleAScalars.Add(GenerateScalar(theRectangle.LowerLeftCorner(), axis));
rectangleAScalars.Add(GenerateScalar(theRectangle.LowerRightCorner(), axis));
//Project the corners of the current Rectangle on to the Axis and
//get a scalar value of that projection we can then use for comparison
List <int> rectangleBScalars = new List <int>();
rectangleBScalars.Add(GenerateScalar(UpperLeftCorner(), axis));
rectangleBScalars.Add(GenerateScalar(UpperRightCorner(), axis));
rectangleBScalars.Add(GenerateScalar(LowerLeftCorner(), axis));
rectangleBScalars.Add(GenerateScalar(LowerRightCorner(), axis));
//Get the Maximum and Minium Scalar values for each of the Rectangles
int rectangleAMinimum = rectangleAScalars.Min();
int rectangleAMaximum = rectangleAScalars.Max();
int rectangleBMinimum = rectangleBScalars.Min();
int rectangleBMaximum = rectangleBScalars.Max();
//If we have overlaps between the Rectangles, then there is a collision between the rectangles on this Axis
if (rectangleBMinimum <= rectangleAMaximum && rectangleBMaximum >= rectangleAMaximum)
{
return(true);
}
else if (rectangleAMinimum <= rectangleBMaximum && rectangleAMaximum >= rectangleBMaximum)
{
return(true);
}
return(false);
}
//Determines if a collision has occurred on an Axis of one of the planes parallel to the Rectangle
private bool IsAxisCollision(RotatedRectangle theRectangle, Vector2 axis)
{
//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> rectangleAScalars = new List<int>();
rectangleAScalars.Add(GenerateScalar(theRectangle.UpperLeftCorner(), axis));
rectangleAScalars.Add(GenerateScalar(theRectangle.UpperRightCorner(), axis));
rectangleAScalars.Add(GenerateScalar(theRectangle.LowerLeftCorner(), axis));
rectangleAScalars.Add(GenerateScalar(theRectangle.LowerRightCorner(), axis));
//Project the corners of the current Rectangle on to the Axis and
//get a scalar value of that projection we can then use for comparison
List<int> rectangleBScalars = new List<int>();
rectangleBScalars.Add(GenerateScalar(UpperLeftCorner(), axis));
rectangleBScalars.Add(GenerateScalar(UpperRightCorner(), axis));
rectangleBScalars.Add(GenerateScalar(LowerLeftCorner(), axis));
rectangleBScalars.Add(GenerateScalar(LowerRightCorner(), axis));
//Get the Maximum and Minium Scalar values for each of the Rectangles
int rectangleAMinimum = rectangleAScalars.Min();
int rectangleAMaximum = rectangleAScalars.Max();
int rectangleBMinimum = rectangleBScalars.Min();
int rectangleBMaximum = rectangleBScalars.Max();
//If we have overlaps between the Rectangles, then there is a collision between the rectangles on this Axis
if (rectangleBMinimum <= rectangleAMaximum && rectangleBMaximum >= rectangleAMaximum)
{
return true;
}
else if (rectangleAMinimum <= rectangleBMaximum && rectangleAMaximum >= rectangleBMaximum)
{
return true;
}
return false;
}