Processing 1.0 - Processing Discourse - Setup runs more than once

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Index › Programming Questions & Help › Syntax Questions › Setup runs more than once

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Setup runs more than once (Read 297 times)

Dan_Olner

Setup runs more than once
Jul 25^th, 2008, 4:31pm

Hi

Setup is called more than once if (for instance) I set the size. i.e -

void setup () {

println("ping!");

size(500, 500);

}

void draw () {

}

- results in two pings. Without the size setting, there's just one. This can be a problem e.g. if initialising sounds - I get them twice.

I've dealt with it by a boolean and my own 'setup' with the draw method, but shouldn't setup only run once? What's a-goin on? Not sure if this is bug or just something I'm missing....?

PhiLho

Re: Setup runs more than once
Reply #1 - Jul 25^th, 2008, 6:12pm

In size() reference page, I read: "The size() function must be the first line in setup()."
This is not enforced, and you can safely ignore this rule in some cases, ie. it can work as expected (eg. if I add just smooth() and noLoop() before size(), it is still run only once) but be prepared to some side effects (even if this one is quite surprising!).

In other words, I can reproduce the issue in v.0141, and if I move size() before println(), it prints only once.

fry

Re: Setup runs more than once
Reply #2 - Jul 27^th, 2008, 9:29pm

Dan_Olner wrote on Jul 25^th, 2008, 4:31pm:

results in two pings. Without the size setting, there's just one. This can be a problem e.g. if initialising sounds - I get them twice.

I've dealt with it by a boolean and my own 'setup' with the draw method, but shouldn't setup only run once What's a-goin on Not sure if this is bug or just something I'm missing....

from http://processing.org/reference/size_.html
Again, the size() method must be the first line of the code (or first item inside setup). Any code that appears before the size() command may run more than once, which can lead to confusing results.

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