Processing 1.0 - Processing Discourse - Want to return multiple items from a function

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Index › Programming Questions & Help › Syntax Questions › Want to return multiple items from a function

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Want to return multiple items from a function (Read 1182 times)

_brentonW

Want to return multiple items from a function
Nov 17^th, 2009, 1:53pm

Goal: Create a function that returns x & y coordinates based on the circumference of a circle.

Problem: Can't get the function to return more than one data point when I need two. Get error message. "Syntax error, maybe a missing semicolon?

Code:
void setup(){
//some code here
}

int placeOnCirc (int circWide, int angle){

int x = int( cos(radians(angle)) * (circWide/2));
int y = int( sin(radians(angle)) * (circWide/2));

return x, y;
}

Can someone tell me what I need to do to return an x AND y coordinate? I assume it involves an array but don't know how.

Thanks.

d.rifkin

Re: Want to return multiple items from a function
Reply #1 - Nov 17^th, 2009, 2:27pm

While you could use a two element array, it'd probably be clearer if you used an object. Processing has a class called PVector which is often used to describe locations (or velocities, accelerations, etc.).

What you should do is make your function return PVector rather than int, and then return a PVector that contains both the x and y values.

Your new function might look something like this:
Code:

PVector placeOnCirc (int circWide, int angle) {
  PVector location = new PVector();

  location.x = cos(radians(angle)) * (circWide/2);
  location.y = sin(radians(angle)) * (circWide/2);

  return location;
}

Note that the PVector class uses floats rather than ints for its values, though for this function that shouldn't be a problem.

For more information about the PVector class, see this reference page:

http://processing.org/reference/PVector.html

_brentonW YaBB Newbies Offline Posts: 2	Re: Want to return multiple items from a function Reply #2 - Nov 17^th, 2009, 4:51pm Thanks. Really appreciate it.

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