map() function

Emmos

Hello,

I am trying to figure out how this map() function works... but I just don't get it. Maybe you guys can help me out..

For example:

float a;

void setup(){
  size(300, 300);
}

void draw(){
  a= 50;
  a=map(a, -100, 100, 0, 2000);
}

How big wil "A" be after the mapping and why?

koogs

just println(a); to find out...

the input values go from -100 to 100. 50 is 3/4s of the way along that line so the output is 3/4s of the way along the line from 0 to 2000 (= 1500)

-100--------0000--------+100
                    ^50
0000--------1000--------2000
                    ^1500

Emmos

Thx allot!

so if A would be 0. The output would be 1000?

koogs

try it!

(yes)

Emmos

You sir, are my hero.. I will try it.

Thank you!