Spiro

spiro.png
##Warning this code is a bit unstable, but nice ;)

    /*
    author: @fabiantheblind
    This script creates a graphic line in circles
    based on this processing sketch by PhiLho
    http://forum.processing.org/topic/how-can-i-draw-this#25080000000995029
    the size of the page
    */
    var ph= 150;
    var pw= 150;
    
        // we need a doc
      // use pw and phas size
      var doc = app.documents.add({
                  documentPreferences:{
                      pageHeight:ph,
                      pageWidth:pw
                  }
          }); 
      
      // the page is already there
      var page = doc.pages.item(0);
      // get the center of the page
      var cx = pw / 2;
      var cy = ph / 2;
      // define the initial radius
      var init_rad = 0.9 *(pw / 2);
      var radius = init_rad;
      //this is the amplitude fpr the disturb
      var  amplitude = radius / 1;
     
      // create a graphicLine
      var gl = page.graphicLines.add(); 
      var radians_angle; // this will hold the angle in radians
      var rounds = 75; // how many rounds
        
    //~   we need to count the path points.
    //~   the first an second always exist in  a graphic line
      var count = 0;
      var degree_step  = 4;
      
      // loop through the data.anchors
      
      for(var degrees = 0; degrees < 360 *rounds; degrees+= (360/degree_step)){
          
          // calculate the degree to radians
          radians_angle = ((degrees/360)%360) * 2 * Math.PI;
        // get the point
          var point = gl.paths[0].pathPoints[count];
         // set the disturb to 0 if you want straight lines
        // calc the position on the circle
        var x1 = cx + (radius  ) * Math.cos(radians_angle);
        var y1 = cy + (radius  ) * Math.sin(radians_angle);
        radius-= 0.2;
          /**
           * a graphicLine always has 2 path points
           * so we need to add points only from the third index
           * 
           */
          if(count < 2){
    
              point.anchor = [x1,y1];
    
            if(count%4 == 0 ) point.rightDirection = [x1, y1+radius];
            if(count%4 == 1 ) point.rightDirection = [x1 - radius,y1];
            if(count%4 == 2 ) point.rightDirection = [x1 , y1 - radius];
            if(count%4 == 3 ) point.rightDirection = [x1 + radius ,y1 ];
    
          }else{
              point = gl.paths[0].pathPoints.add();
              point.anchor =  [x1,y1];
            if(count%4 == 0 ) point.rightDirection = [x1, y1+radius];
            if(count%4 == 1 ) point.rightDirection = [x1 - radius,y1];
            if(count%4 == 2 ) point.rightDirection = [x1 , y1 - radius];
            if(count%4 == 3 ) point.rightDirection = [x1 + radius ,y1 ];
           }
            
            // now make the circle smaller by every round
            //if(degrees%360 == 0)radius-= ((init_rad)/rounds );
            count++;
          }