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start programming (Read 834 times)
neugi
start programming
Sep 22nd, 2005, 10:08am  
hi,

if've just startet reading about processing and i tried to make a test is wrote this code:

size (200,200);
background (255);
for (int i=0; i>=199; i=i+1)
{
 for (int e=0; e>=199; e=e+1)
 {
   point (i,e);
 }
}

but i only got a withe screen, why?

best
neugi
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icioula
Re: start programming
Reply #1 - Sep 22nd, 2005, 10:56am  
1 - The "for" loop is executed when the middle condition is true.
so you need to change >=  to <=

2 - If you write i = i+1 then you will draw a point on every single pixel of the drawing area so in the following example you will paint the whole area in black.


size (200,200);
background (255); //white background

for (int i=0; i<=199; i++) // a most common way of writing i = i+1 is i++
{
 for (int e=0; e<=199; e++)
 {
   point (i,e);
 }
}


You can then do things like this:

size (200,200);
background (255); //white background
stroke(255,0,0);  // draw the points in red

for (int i=0; i<=width; i+=2) // i+=2 will draw your points every 2 pixels.
{
 for (int e=0; e<=height; e+=2)
 {
   point (i,e);
 }
}

hope that helps.
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neugi
Re: start programming
Reply #2 - Sep 22nd, 2005, 11:52am  
thx helped a lot.

i've tried the i++ but it don't worked because of the <= />= mistake.

i'm currently reading the turorials but they are not completet now so is there any other source to lern processing?

thx
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mark hill
Re: start programming
Reply #3 - Sep 22nd, 2005, 12:58pm  
The exhibition page with links to folks projects is a good place. Most people include their source code.

I mostly started playing with other peoples stuff (still do!). Ask questions when you get stuck. You'll normally get a fairly quick response.

the daniel shiffman stuff is also worth taking a look at. I think the link is on the site some where. Do a search for procedural painting

***update***

http://www.shiffman.net/teaching.html

try here!
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icioula
Re: start programming
Reply #4 - Sep 22nd, 2005, 1:13pm  
There is no unique way to learn a programming language or how to use processing really. Learning by example is quite effective to understand how things work and a good way to develop your own interest in a specific field too.

http://processing.org/faq/index.html#learn

The forum search and the processing example sketches are
good starts to find examples.

have fun!
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neugi
Re: start programming
Reply #5 - Sep 22nd, 2005, 1:46pm  
i currently only can php & mysql and the standart java for homepage Wink

so java (or wathever the language is like) is new to me. but i'll have a look at what you've posted

thx
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