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Topic: please explain (Read 591 times) |
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r_gaberz
  
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please explain
« on: Jan 9th, 2004, 11:03pm » |
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// Warning newbie
could someone explain this code to me?
i can't understand why the bars move!
There is no if or while function.
everything seems to be static
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// Seconds Minutes Hours
// By mescobosa
int LNhour = 18;
int LNmin = 11;
int LNsec = 4;
int Hhour = 120;
int Hmin = 60;
int Hsec = 20;
int Yhour = 0;
int Ymin = Hhour;
int Ysec = Hhour + Hmin;
void setup()
{
size(200, 200);
noStroke();
}
void loop()
{
background(0);
int hr = hour();
int min = minute();
int sec = second();
float xposHour = hr * width/23.0;
float xposMin = min * width/59.0;
float xposSec = sec * width/59.0;
fill(255);
rect(xposHour - LNhour, Yhour, LNhour, Hhour);
rect(xposMin - LNmin, Ymin, LNmin, Hmin);
rect(xposSec - LNsec, Ysec, LNsec, Hsec);
rect(xposHour/2 - LNhour, Yhour, LNhour, Hhour);
rect(xposMin/2 - LNmin, Ymin, LNmin, Hmin);
rect(xposSec/2 - LNsec, Ysec, LNsec, Hsec);
rect(xposHour/4 - LNhour, Yhour, LNhour, Hhour);
rect(xposMin/4 - LNmin, Ymin, LNmin, Hmin);
rect(xposSec/4 - LNsec, Ysec, LNsec, Hsec);
rect(xposHour/8 - LNhour, Yhour, LNhour, Hhour);
rect(xposMin/8 - LNmin, Ymin, LNmin, Hmin);
rect(xposSec/8 - LNsec, Ysec, LNsec, Hsec);
rect(xposHour/16 - LNhour, Yhour, LNhour, Hhour);
rect(xposMin/16 - LNmin, Ymin, LNmin, Hmin);
rect(xposSec/16 - LNsec, Ysec, LNsec, Hsec);
}
----------------------------------------------------
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arielm
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Re: please explain
« Reply #1 on: Jan 10th, 2004, 9:36pm » |
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the answer is blowing in the following 3 lines:
Code:int hr = hour();
int min = minute();
int sec = second();
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where hour(), minute() and second() are 3 processing predefined functions returning values based on your computer's clock...
one receipe that works well when reading pieces of code:
- start to read from the top.
- stop when something is not clear and try to gather more info about it...
so for instance, when you fall on the hour() statement:
- it's a function that you don't know.
- you can see in the code that this function is not declared anywhere.
- then you can go in the "reference" and search for this function (what is does and most importantly: what kind of value it returns...)
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| « Last Edit: Jan 11th, 2004, 12:01am by arielm » |
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Ariel Malka | www.chronotext.org
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fry
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Re: please explain
« Reply #2 on: Jan 10th, 2004, 11:25pm » |
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hopefully you don't even have to search in the reference for the function, but can select the function name (just the name, no parens), then right-click and select 'find in reference' and it'll show you the reference directly.
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