/// <summary>
/// Determines if the elementGridSpace occupies any of the same grid-space as this element.
/// </summary>
/// <param name="elementGridSpace">Element grid space to compare</param>
/// <returns>True if this and the input elements overlay each other</returns>
public bool intersects(ElementGridSpace elementGridSpace)
{
// For efficiency:
// This is an O(N^2) complexity operation
// Reduce complexity by iterating over smaller grid space
return(occupiedGridSpaces.Count >= elementGridSpace.occupiedGridSpaces.Count
? isOverlaid(elementGridSpace, this)
: isOverlaid(this, elementGridSpace));
}
/// <summary>
/// Determines if the two input elements occupy any of the same grid-space as each other.
/// For efficiency purposes, since this is an O(N^2) complexity operation,
/// The smaller element should be input first.
/// </summary>
/// <param name="smallerTestElement">Smaller grid element</param>
/// <param name="largerTestElement">Larger grid element</param>
/// <returns>True of the two elements overlay each other on the gird.</returns>
private static bool isOverlaid(ElementGridSpace smallerTestElement, ElementGridSpace largerTestElement)
{
// This will iterate through the smaller grid element's coordinates, and determines if
// it has any of the larger element's grid coordinates match them.
for (var i = smallerTestElement.leftColumn; i <= smallerTestElement.rightColumn; i++)
{
for (var j = smallerTestElement.topRow; j <= smallerTestElement.bottomRow; j++)
{
if (largerTestElement.hasCoordinates(i, j))
{
return(true);
}
}
}
return(false);
}