number of decimals in float value

Rouzbelious

Hey guys, I am new to processing so sorry about my basic question : I want to println a float value with four digits after the point but it only show 0.0 in bottom message box. what should I do?

kalkr

https://processing.org/reference/nf_.html

float num = 4;
float num2 = 4.25;

println( nf( num, 1, 4 ) );
println( nf( num2, 1, 4 ) );

4.0000 4.2500

Keep in mind that nf() returns a String, so you can assign it to a String variable.

Rouzbelious

Thank You kalkr, But as you see below the tg variable that I am trying to print with 4 digits is actually used in other lines and it can't be a string. it looks processing rounds the value so other equations wont return true value.

int   r  =  200;
float tg;

float xa;
float ya;
void setup(){
  size(1000,500);
  background(255);
smooth();
}
void draw(){
  translate(width/2,height/2);
}
void mousePressed() {  
  tg =(height/2 - mouseY)/mouseX;
  println(tg);
  strokeWeight(5);
  xa = r/(sqrt(sq((height/2 - mouseY)/mouseX)+1));
  ya = height/2 - ((r*((height/2 - mouseY)/mouseX))/(sqrt(sq((height/2 - mouseY)/mouseX)+1)));
}

kalkr

int r = 200; 
float tg;
float xa; 
float ya; 

void setup() { 
  size(1000, 500); 
  background(255); 
  smooth();
} 

void draw() { 
  translate(width/2, height/2);
} 

void mousePressed() {
  tg =(height/2 - mouseY)/mouseX; 

  /=========

  println(tg); //what you had

  println( nf(tg, 1, 4) ); //what you want

  /=========

  strokeWeight(5); 
  xa = r/(sqrt(sq((height/2 - mouseY)/mouseX)+1)); 
  ya = height/2 - ((r*((height/2 - mouseY)/mouseX))/(sqrt(sq((height/2 - mouseY)/mouseX)+1)));
}

nf() doesnt turn a float variable into a string variable (which isnt possible anyways), it simply formats a number the way you want it to look like and returns it as a string.