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Topic: width & height not assigned default size values (Read 646 times) |
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kevinP
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width & height not assigned default size values
« on: Jan 27th, 2004, 11:12pm » |
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From ref page:
"If size() is not called, the default size of the window is 100x100 pixels. The system variables width and height are set based on the parameters passed to the size() function."
I expected that if I didn't explicitly call size(), that the default values of "100" and "100" would also be passed to width and height.
There's no error msg. just an unexpected result.
-K
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Kevin Pfeiffer
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benelek
 
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Re: width & height not assigned default size value
« Reply #1 on: Jan 27th, 2004, 11:54pm » |
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what's the unexpected result? are width and height given other values, or no values...?
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kevinP
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Re: width & height not assigned default size value
« Reply #2 on: Feb 2nd, 2004, 9:56am » |
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on Jan 27th, 2004, 11:54pm, benelek wrote:| what's the unexpected result are width and height given other values, or no values... |
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(Sorry, I didn't see your question.)
The variables width and height are left empty...
Actually, I'm not sure -- as I recall in my code they were treated as if they had values of 0. I think this was the case because otherwise I should have had a null pointer error (or); instead I was getting the wrong positioning of something that relied on these.
-K
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| « Last Edit: Feb 2nd, 2004, 9:58am by kevinP » |
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Kevin Pfeiffer
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fry
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Re: width & height not assigned default size value
« Reply #3 on: Feb 3rd, 2004, 12:12am » |
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if size() is not called, it gets called internally. so width & height should be set to 100 even if you don't use size() in your program. so if it's not doing that, then it'd be a bug. but it seems to be working ok, i just tried this program:
println(width);
and it printed 100 to the console, which is the expected behavior.
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kevinP
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Re: width & height not assigned default size value
« Reply #4 on: Feb 3rd, 2004, 12:40am » |
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yep... that seems to be "user error" as I, too, get "100". I'll see if I can figure out what was happening (in case I can figure out in which sketch that was).
-K
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Kevin Pfeiffer
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kevinP
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Re: width & height not assigned default size value
« Reply #5 on: Feb 3rd, 2004, 9:09pm » |
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Okay, here's what I think happened:
Code:
// Based on REAS's Setup and Loop
void setup()
{
size(200, 200);
stroke(255);
framerate(15);
}
float y;
void loop() {
background(0);
y = y - 1;
if (y < 0) { y = height; }
line(0, y, width, y);
}
// another block
{
println(width); // prints "0"
}
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Shouldn't the last println() statement have thrown an error (ince this is not laid back Perl)?
-K
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Kevin Pfeiffer
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