These functions doesn't exist, why?

Processing Coding Questions
1

Hi all! I am new here, specifically signed up to resolve this problem.

I have Processing 3. I am trying to make two “walkers”. I have all this code here but I keep getting the error message that the functions step(), render(), don’t exist. Any ideas why?

> Walker w1;
> Walker w2;
> 
> void setup()
> {
>   size( 800,600 );
>   background ( 255 );
>   
>   w1 = new Walker();
>   w2 = new Walker();
> }
> 
> void draw()
> { 
>   w1.step();
>   w1.render();
>   
>   w2.step();
>   w2.render();
> }
> 
> class Walker
> {
>   float x;
>   float y;
>   int stepSize;
>   
>   Walker()
>   {
>    x = width / 2;
>    y = height / 2;
>    stepSize = 8;
>   }
>   
>   void step()
>   {
>     int choice = int( random( 4 ) );
>     
>     if (choice == 0) // up
>     {
>      y = y - stepSize; 
>     }
>     else if (choice == 1) // down
>     {
>       y = y + stepSize;
>     }
>     else if (choice == 2) // left
>     {
>      x = x - stepSize; 
>     }
>     else if (choice == 3) // right
>     {
>      x = x + stepSize; 
>     } 
> }
>   
>   void render()
>   {
>     noStroke();
>     fill( random(256), random(256), random(256) );
>     ellipse(x,y,8,8);
>   }
> }

Any insight would be much appreciated. Thank you!

2

after deleting all the "> "
your code runs just fine here.

win7 / processing 3.4 / JAVA mode /

i noticed that actually there is no need for 2 different methods, one “display” can do both.

and clean pasted here using the

</>

formatter:

Walker w1;
Walker w2;

void setup() {
  size( 800, 600 );
  background ( 255 );
  noStroke();
  w1 = new Walker();
  w2 = new Walker();
}

void draw() { 
  w1.make();
  w2.make();
}

class Walker
{
  float x, y;
  int stepSize;

  Walker() {
    x = width / 2;
    y = height / 2;
    stepSize = 8;
  }

  void make() {
    int choice = int( random( 4 ) );
    // println(" choice: "+choice);
    if      (choice == 0) y = y - stepSize; // up
    else if (choice == 1) y = y + stepSize; // down
    else if (choice == 2) x = x - stepSize; // left
    else if (choice == 3) x = x + stepSize; // right
    fill( random(256), random(256), random(256) );
    ellipse(x, y, stepSize, stepSize);
  }
}

but you could need a check on if a walker hits the window border.