int SCRIBBLE = 0;
  int HATCHING = 1;
  
  void setup(){
    size(640, 360);
    background(0);
  
    // Create arrays to hold x, y coords
    float[]x = new float[4];
    float[]y  = new float[4];
    // create a convenient 2-dimensional 
    // array to hold x, y arrays
    float[][]xy = {x, y};
  
    // Record points
    // X positions     
    xy[0][0] = 125;
    xy[0][1] = 475;
    xy[0][2] = 475;
    xy[0][3] = 125;
  
    // Y positions
    xy[1][0] = 100;
    xy[1][1] = 100;
    xy[1][2] = 260;
    xy[1][3] = 260;
  
    // Call plotting function
    makeRect(xy);
  }
  
  void makeRect(float[][]pts){
    stroke(255);
    smooth();
    
    // Scribble variables, that get passed as arguments to the scribble function
    int steps = 100;
    float scribVal = 3.0;
    for (int i = 0; i < pts[0].length; i++){
      // Plots vertices
      strokeWeight(5);
      point(pts[0][i], pts[1][i]);
  
      // Call scribble function
      strokeWeight(.5);
      if (i > 0){ 
        scribble(pts[0][i], pts[1][i], pts[0][i-1], pts[1][i-1], steps, scribVal, SCRIBBLE);
      } 
      if (i == pts[0].length-1){
      // Show some hatching between last 2 points
        scribble(pts[0][i], pts[1][i], pts[0][0], pts[1][0], steps, scribVal*2, HATCHING);
      }
    }
  }
  
  /* 
    Scribble function plots lines between end points, 
    determined by steps and scribVal arguments.
    two styles are available: SCRIBBLE and HATCHING, which
    are interestingly only dependent on parentheses
    placement in the line() function calls.
  */
  
  void scribble(float x1, float y1, float x2, float y2, int steps, float scribVal, int style){
  
    float xStep = (x2-x1)/steps;
    float yStep = (y2-y1)/steps;
    for (int i = 0; i < steps; i++){
      if(style == SCRIBBLE){
        if (i < steps-1){
          line(x1, y1, x1+=xStep+random(-scribVal, scribVal), y1+=yStep+random(-scribVal, scribVal));
        } 
        else {
          // extra line needed to attach line back to point- not necessary in HATCHING style
          line(x1, y1, x2, y2);
        }
      }
      else if (style == HATCHING){
         line(x1, y1, (x1+=xStep)+random(-scribVal, scribVal), (y1+=yStep)+random(-scribVal, scribVal));
      }
    }
  }