OOP Need help getting methods to return objects.

Question

I am working on a class of vectors in JSL.  I would like to have a method that would return a normalized version of the vector.  Below is my script and error message.  Thanks!

Clear Log();
Clear Globals();

Define Class(
	"vector",
	x = 0;
	y = 0;
	z = 0;
	_init_ = Method( {a, b, c = 0},
		x = a;
		y = b;
		z = c;
	);
	_show_ = Method( {},
		Return( x, y, z )
	);
	mag = Method( {},
		magnitude = Sqrt( x ^ 2 + y ^ 2 + z ^ 2 )
	);
	normalize = Method( {},
		nv = vector(0,0,0);
		length = Sqrt( x ^ 2 + y ^ 2 + z ^ 2 );
		show(length);
		nv:x = x / length;
		nv:y = y / length;
		nv:z = z / length;
		nv;
	);
);

bob = New Object( vector( 4, 2 ) );
Show( bob );
bob<<normalize();

Name Unresolved: vector in access or evaluation of 'vector' , vector( 0, 0, 0 )

johnmoore · Answer

Georgia,

Thanks for your reply.  I found the "clone" message for objects that I can use to create a copy of the object and then normalize it.  I will keep looking around and see if I can find anything on how to return objects from methods directly like they do in the "complex" class example.

John

gzmorgan0 · Answer

I am a novice when it comes to classes in general and JMP Classes.  This works:

Clear Log();
Clear Globals();

Define Class(
	"vector",
	x = 0;
	y = 0;
	z = 0;
	_init_ = Method( {a, b, c = 0},
		x = a;
		y = b;
		z = c;
	);
	_show_ = Method( {},
		Return( x, y, z )
	);
	mag = Method( {},
		magnitude = Sqrt( x ^ 2 + y ^ 2 + z ^ 2 )
	);
	normalize = Method( {},
		nv = [0,0,0];
		length = Sqrt( x ^ 2 + y ^ 2 + z ^ 2 );
		show(length);
		nv[1] = x / length;
		nv[2] = y / length;
		nv[3] = z / length;
		Print(char(nv));
		nv;
	);
);

bob = New Object( vector( 4, 2 ) );
Show( bob );
bob = bob:normalize();
show(bob);

Ther is a method to pass self.  I suggest the JMP Scripting Guide and searching this website for Classes.