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Index › Programming Questions & Help › Programs › help laying out object in grid
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help laying out object in grid (Read 279 times)
oompa_l
help laying out object in grid
Jan 3rd, 2009, 7:27am  
I have an array of objects constructed from entries in a text file, each one occupying the areaof a rectangle on the screen. I am trying to lay each one out from left to right, and upong reaching the end of the row, returning to for a new one.

I am having trouble figuring out a decent pattern for this. What I have been trying to do is use the ceil() function on a for loop integer divided by the number of columns in each row. My thought was that this integer wold control which row each object would sit on.

one problem i am having is that the ceil function returns a zero on a fraction such as 1/8. I was hoping it would return a 1. Is there a way to convert from a fraction to a float?

Another is how to return to 1 after reaching the 8th column. I was using modulo as in i%8+1, but I am getting a 2 for (i=1) or the first loop...things are just slightly off and I'm not sure why.

if anyone has any readymade solutions, I would happy to hear about those too...
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steven
Re: help laying out object in grid
Reply #1 - Jan 3rd, 2009, 9:21am  
Hey there,

a couple of things.
When you use modulo, the operation is done before the addition
so when you try i%8+1 it's the same thing as writing (i%8)+1.What you want is i%(8+1).

Below is an example of the for loop.
Notice how the variable columns is a float and not an interger. Why? because when you divide two integers, even though there should be floating numbers, these floating numbers are lost.
Writing 5/3 won't give you the same result as writing 5/3.0
Check it out for yourself

Code:

float columns = 5;
for (int i=1; i < 25; i++) {
  println("ROW: " + ceil(i/columns) + " --- COLUMN: " + i%columns);
}
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PhiLho 
Re: help laying out object in grid
Reply #2 - Jan 3rd, 2009, 4:53pm  
Sound a bit like Re: make a shape when the char is detected, no Smiley
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oompa_l
Re: help laying out object in grid
Reply #3 - Jan 3rd, 2009, 8:46pm  
Thanks to both of you...yes, that helps alot PhiLo...

so helpful
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