Assigning int variable to part of a variable name

Programming Questions

Jesse Sco..

Assigning int variable to part of a variable name

in Programming Questions • 2 years ago

Hi all,

I have a series of colors defined eg:

color c_0 = color(255,255,255);

...

color c_5 = color(180,60,60);

Then I have an int which cycles through 0-6 based on some buttons...

What I want to do is assign the int "styleIndex" to the second part of the color variable (after the underscore)

ie.

fill(color(c_styleIndex));

but am obviously getting errors (cannot find symbol).

What is the proper syntax to achieve this?

Do I use brackets, ticks, $ sign ??/

I guess I could probably use an Array instead, but im kind of curious on this now...

thanks.

Replies(5)

PhiLho

Re: Assigning int variable to part of a variable name

2 years ago

Funny as people keep asking such thing. I don't know where this idea comes from. There are some languages allowing such trick, but not Java.
And, yes, you should use arrays instead.

Or, if you want to go explore this way, take a look at HashMap, but it is much slower.

Jesse Sco..

Re: Assigning int variable to part of a variable name

2 years ago

Ah, I didn't know it was a limitation of Java. But I guess I would have come across this by now if not...

It's always the first thing you learn in graphical/patching languages (not that I'm trying to compare them to Java...)

Arrays it is!

Thanks again phi.lho

PhiLho

Re: Assigning int variable to part of a variable name

2 years ago

I wouldn't define it as a limitation... Rather as a design choice, I am not sure if this feature is really useful.
Have you examples of " graphical/patching languages" allowing it? Out of curiosity.

Jesse Sco..

Re: Assigning int variable to part of a variable name

2 years ago

Fair enough. Limitation is a harsh word

Well, Pd and Max both have the $1 function as a pretty major element of their functionality, allowing you to wire in a float/int/symbol into anywhere. You can also 'send' a value (x) then call it anywhere by $x, by itself or addended to another variable/statement, as above.

Touch Designer is even easier - you can do the same by calling $arg1, $arg2, etc (each object or node their can have multiple values), or, because of the TScript scripting language for expressions, you can simply go c_`chop("count1/chan1")` in order to provide what I needed above...

I use it a lot in those two environments, maybe because it's easier than using arrays in them...

PhiLho

Re: Assigning int variable to part of a variable name

2 years ago

Thanks for the examples, I have never used these languages. Come to think of it, IIRC, PHP allows to do $x = $$v where $v variable contains a variable name.

Top Reply