Why is my 'if' statement not executing in this code? (Processing)

Question

    void setup(){
  size(800,600);
  background(0);
  fill(255,40,40);
  noStroke();
  ellipse(400,80,20,20);
  ellipse(150,513,20,20);
  ellipse(650,513,20,20);
  fill(255);
  frameRate(10);
}

float traceX = 350;
float traceY = 350;
String vertexPick = "";
float rand = 0;

void draw(){

  point(traceX,traceY);
   rand = random(1);
  if (rand > 2/3) {
    vertexPick = "A";
  }
  else if (rand < 1/3) {
    vertexPick = "B";
  } else {
    vertexPick = "C";
  }

  if (vertexPick == "A") {
    traceX = (traceX+400)/2;
    traceY = (traceY+80)/2;
  }
  else if (vertexPick == "B") {
    traceX = (traceX+150)/2;
    traceY = (traceY+513)/2;
  }
  else 
  {
    traceX = (traceX+650)/2;
    traceY = (traceY+513)/2;
  }  
}

I've checked, and every time through the 'draw' function it is generating a new random number between 0 and 1. But instead of assigning vertexPick to a new letter based on the number, it gets stuck on one value of vertexPick and stays there forever. Can anyone tell me why? Why would it not execute the if statement again on every loop?

The draw function is a built-in loop in processing, it loops automatically. — Jack, Nov 08 '17 at 19:01

score 0 · Accepted Answer · edited May 23 '17 at 12:25

0

You have a problem with the division of integers, namely 2/3 is 0 and the condition rand > 2/3 is always true.

To have floating point division use 2.0/3 in place of 2/3.

(see this question Division of integers in Java)

edited May 23 '17 at 12:25

Community

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answered Apr 28 '17 at 12:20

user2314737

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That was it! Thanks for your help! – Jack Apr 28 '17 at 13:05

Why is my 'if' statement not executing in this code? (Processing)

1 Answers1