/// <summary>
/// Returns true if the given Rectangle is colliding with the given axis.
/// </summary>
/// <param name="other"></param>
/// <param name="axis"></param>
/// <returns></returns>
private bool IsAxisCollision(RotatableRectangle other, Vector2 axis)
{
int thisMinScaler, otherMinScaler, thisMaxScaler, otherMaxScaler;
// this scalers
int scaler = GenerateScalar(this.topLeft, axis);
thisMinScaler = scaler;
thisMaxScaler = scaler;
scaler = GenerateScalar(this.topRight, axis);
if (scaler < thisMinScaler)
thisMinScaler = scaler;
if (scaler > thisMaxScaler)
thisMaxScaler = scaler;
scaler = GenerateScalar(this.bottomLeft, axis);
if (scaler < thisMinScaler)
thisMinScaler = scaler;
if (scaler > thisMaxScaler)
thisMaxScaler = scaler;
scaler = GenerateScalar(this.bottomRight, axis);
if (scaler < thisMinScaler)
thisMinScaler = scaler;
if (scaler > thisMaxScaler)
thisMaxScaler = scaler;
// other scalers
scaler = GenerateScalar(other.topLeft, axis);
otherMinScaler = scaler;
otherMaxScaler = scaler;
scaler = GenerateScalar(other.topRight, axis);
if (scaler < otherMinScaler)
otherMinScaler = scaler;
if (scaler > otherMaxScaler)
otherMaxScaler = scaler;
scaler = GenerateScalar(other.bottomLeft, axis);
if (scaler < otherMinScaler)
otherMinScaler = scaler;
if (scaler > otherMaxScaler)
otherMaxScaler = scaler;
scaler = GenerateScalar(other.bottomRight, axis);
if (scaler < otherMinScaler)
otherMinScaler = scaler;
if (scaler > otherMaxScaler)
otherMaxScaler = scaler;
if (thisMinScaler <= otherMaxScaler && thisMaxScaler >= otherMaxScaler)
return true;
else if (otherMinScaler <= thisMaxScaler && otherMaxScaler >= thisMaxScaler)
return true;
return false;
}
/// <summary>
/// Returns true if the Rectangle intersects with the other Rectangle.
/// </summary>
/// <param name="other"></param>
/// <returns></returns>
public bool Intersects(RotatableRectangle other)
{
if (this.recalculateCorners)
CalculateCorners();
if (other.recalculateCorners)
other.CalculateCorners();
Vector2 axis1 = this.topRight - this.topLeft;
Vector2 axis2 = this.topRight - this.bottomRight;
Vector2 axis3 = other.topLeft - other.bottomLeft;
Vector2 axis4 = other.topLeft - other.topRight;
if (!IsAxisCollision(other, axis1))
return false;
if (!IsAxisCollision(other, axis2))
return false;
if (!IsAxisCollision(other, axis3))
return false;
if (!IsAxisCollision(other, axis4))
return false;
return true;
}