Lose the .0 in label / value

[DanH]

I've asked this before ages ago but cannot for the life of me find it. If I display a value of a knob in a label I get (since develop) the decimal point included, even if the value is an integer, eg 1.0. 2.0 where I just want 1, 2 etc.

There's an simple line of code that's need to be in the callback if I remember correctly...

[Matt_SF]

@DanH

Engine.doubleToString(numDecimal, value)

If I remember correctly.

[ustk]

@DanH @Matt_SF doubleToString parameters are the other way round Engine.doubleToString(double value, int digits)
In this case a simple Math.round(value) will remove the last digit the other function can't

[DanH]

@ustk @Matt_SF thanks both, I've written it like this in the callback, is there an easier way?

local x = Math.round(value);
LabelValue.set("text", x);

[ustk]

@DanH you don't need to create a variable for this as it is simple to understand, you can directly put the round function inside the label set

[David Healey]

@DanH said in Lose the .0 in label / value:

even if the value is an integer, eg 1.0. 2.0

Those aren't integers ;)

You could also use parseInt()

[DanH]

@d-healey thanks, should have used a full stop rather than a comma

[Matt_SF]

@ustk said in Lose the .0 in label / value:

@DanH @Matt_SF doubleToString parameters are the other way round Engine.doubleToString(double value, int digits)
In this case a simple Math.round(value) will remove the last digit the other function can't

My mistake, sorry

[ustk]

@d-healey said in Lose the .0 in label / value:

You could also use parseInt()

I don't like the parseInt function, because, in some (rare) cases, it treats a leading zero as an octal number. I agree this is rarely the case (it happens for instance when dealing with dates).

example:

Console.print(parseInt("0500"));	// => 320
Console.print(Math.round("0500"));	// => 500

Though in this case, it is not a problem to use it, I just personally feel like wanting to stay away from it :)

EDIT:
I just discovered that when not using a string, both are converting octal to base10!
(this makes sense since they are written in an octal fashion...)

Console.print(parseInt(0500));		// => 320
Console.print(Math.round(0500));	// => 320

But I don't see a scenario where this could happen anyway...

[David Healey]

@ustk Is there an efficiency difference between the two functions?

[ustk]

@d-healey That is what I'm wondering... Making a benchmark to see...

[ustk]

@d-healey Another reason to stick with Math.round() !

reg a = 0;

inline function round(dec)
{
	return Math.round(dec);
}

Console.startBenchmark();

for (i=0;i<100000;i+=0.3333)
{
	a = parseInt(i);	// 130-135ms
	a = Math.round(i);	// 50-53ms
	a = round(i);		// 68-70ms
}
	
Console.stopBenchmark();

[David Healey]

@ustk Good test, I get similar results on my system. So Math.round() is the way to go!