Hi all, looking for a math wiz who can show me if it's possible to scale a number up and down using sin or cos.

The idea is to have a 1 line calculation for increasing and decreasing a whole number back and forth, like this:
1 2 3 4 5 6 7 8 9 10 9 8 7 6 5 4 3 2 1 2 3 4 5 6 7 8 9 10 etc.

I can do this with flags, here is the code:
Code:

---

var numCtr = 1;
function testIncrement()
{
	var flagCtr = 1; 	
	while(1)  
	{    
		numCtr += flagCtr;      
		if(numCtr == 10 && flagCtr == 1)      
		{        
			flagCtr = -1;      
		}
		if(numCtr == 1 && flagCtr == -1)
		{
			flagCtr = 1;
		}		            
		wait(-1);
	}
}on_t testIncrement;

---

Anyone have a calculation that does this in less code using sin or cos?

Thanks

-raiden

I'm no maths wiz, but I found this way works:

It will run up and down between 0 and 100 at 'speed' speed.
Code:

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int value = (int)(50 * abs(sinv(total_ticks * speed)));

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EDIT: It's Lite-C BTW.

sin/cos won't give you a linear result though. It would be exponentialy curved.

I use it to make my RTS buildings placement glow to show valid/invalid placement. I guess it will not cycle through each number... but it's still useful

Thank you sheefo, it is indeed useful. I haven't found a conversion to cscript for that, but I'll post it here if I do.

For now, the cscript I posted above will be fine, unless anyone knows of a cscript 1 liner that can do it.

Thanks again everyone for suggestions and comments.

-raiden

Code:

---

int value = (int)(50 * abs(sinv(total_ticks * speed)));

---

is in c-script
Code:

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var value;
value = int(50 * abs(sin(total_ticks * speed)));

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you can achieve better and smoother results with
Code:

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var value;
var speed = 4;
value = 50 + (50 * sin(total_ticks * speed));

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This will cycle between 0 and 100. The above code cycles between 0 and 50. An even faster variant would be
Code:

---

var value;
value = 50 + (50 * sin(total_ticks << 2));

---

For a real linear change use the function cycle(var x, var a, var b);