Processing 1.0 - Processing Discourse - using variables in PApplet.size

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Index › Programming Questions & Help › Programs › using variables in PApplet.size

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using variables in PApplet.size (Read 428 times)

depth

using variables in PApplet.size
Jan 26^th, 2009, 3:11am

from PApplet.size docs:

"Do not use variables as the parameters to size() command, because it will cause problems when exporting your sketch. When variables are used, the dimensions of your sketch cannot be determined during export. Instead, employ numeric values in the size() statement, and then use the built-in width and height variables inside your program when you need the dimensions of the display window are needed."

why exactly is this? is there a way (hacky or not) to get around this?

my goal is to be able to set my application size via an xml file.

PhiLho

Re: using variables in PApplet.size
Reply #1 - Jan 26^th, 2009, 11:50am

I think the main reason is that Processing with use the numbers in the size() call to compute the size of the applet when exporting the sketch (mmm, reading the quoted doc, that's exactly what is stated...). There might be other reasons as well. Note also size() should be the first instruction of setup(), there can be side effects on code before it.

Note you can resize the sketch later, using frame.setSize(w, h);

depth Full Member Offline Posts: 114	Re: using variables in PApplet.size Reply #2 - Jan 26^th, 2009, 7:07pm from an in-the-know friend of mine: Quote: its b/c the exporter does a regular expression parse of that line to determine the height and width of the applet/app its is creating hm...

depth

Re: using variables in PApplet.size
Reply #3 - Jan 26^th, 2009, 7:09pm

oh, and resizing the sketch later isn't good for me, because a lot of my initialization code needs to know width/height up-front. i can rewrite that code, of course, to look at some other variable, so that's not the biggest issue.

another issue is that running in present mode centers the app in the screen based on its size as set in startup. another way around this problem would be to find out how to recenter the app after setup() (or main() or whatever does the centering...haven't had time to dig into PApplet to figure out where/how that happens yet).

PhiLho

Re: using variables in PApplet.size
Reply #4 - Jan 26^th, 2009, 11:59pm

There might be a workaround (untested): the not so known void init() function is called before setup(). Perhaps you can use it to load and parse your XML file and compute the size.
You will avoid the side effects (like double running of instructions between start of setup() and size() call) but will loose the computation of the size of the applet, which isn't much a problem if you don't use it as an applet (or know how to manually set it).

depth

Re: using variables in PApplet.size
Reply #5 - Jan 27^th, 2009, 8:26pm

actually, i'm not having any trouble parsing my XML before size() in setup, though it is possible that it's being called twice (haven't looked into that, and that would not affect my program). thanks for the init() tip, though.

still don't have a way to use my xml config to set the size of the applet tho. if i figure anything out, will post here.

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