3

I have written an expression to get the distance between two points, but it does not work and I haven't a clue why. It's pretty simple:

function findDistance(xa, xb, ya, yb)
{
    return Math.sqrt( (xa - xb)^2 + (ya - yb)^2 );
}
findDistance(682, 617, 310, 342);

The error I get is, "Error at line 0... invalid numeric result (divide by zero?)."

I am so confused by this. It seems so straight forward, so I am not even sure what to ask. Can anyone see what is wrong with this?


EDIT: I am trying to narrow down the issue. Even using the following expression is not working:

Math.sqrt( (682-617)^2 + (310-342)^2 );

Narrowing down further, this finally worked:

Math.sqrt( 5249 );

I also isolated and confirmed that X^2 is the correct way to square something, so what gives?

6

Hate to spoil all your good work, but it's a lot easier to use the built-in length() function:

length(pointa, pointb)

e.g.

length(thisComp.layer(1).position, thisComp.layer(2).position)

or

length([682, 617], [310, 342]); //raw vector values as an array
length(thisComp.layer("foo").anchorPoint, [310, 342]); //a spatial property and an array
length([123,456,789], [10,9,8]); //works in 3D too. 

It's in vector math in the expressions drop-down panel. enter image description here

3

I figured it out. The syntax and/or order of operation could not handle squaring two numbers before adding them, so I added parenthesis to isolate each number and square them BEFORE adding them together.

function findDistance(xa, xb, ya, yb)
{
    return Math.sqrt( ((xa - xb)^2) + ((ya - yb)^2) );
}
findDistance(682, 617, 310, 342);

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.