pass variable from setup to draw

Programming Questions

nathan.wa..

pass variable from setup to draw

in Programming Questions • 8 months ago

I'm trying to get rid of the global variables in my code but how do I do that for variables I use in both my setup() and draw() functions?

Replies(2)

return_tr..

Re: pass variable from setup to draw

8 months ago

perhaps pass the value to a function, store it static inside the function and re-get it again from the function,

function like this

int StoreInt(int _theValue, int _op){

static int storage;
if ( _op == 1 ) { // =set
    storage = _theValue;
    return 0;
    } else { // = get
      return storage;
    }
}

GoToLoop

Re: pass variable from setup to draw

8 months ago

"Global" variables are actually Java field variables of the main sketch.
The sketch itself is a Java class!

The opposite of a field variable is a local variable. Big problems are:

they exist at maximum within the scope of the method they were declared.
They are destroyed after it, and any previous value stored in them are obliterated.

Imagine you wanna load an image and save its reference inside a PImage local variable @ setup().
How can you pass that reference value to draw()???
You tell me! I have no idea myself!!!

The other "attempt" would be to keep loading the image file over and over again within draw().
And that happening @ 60 FPS!
I don't think it's wise to do so just to avoid a "global" field variable!

Top Reply