// String art, Version 0
 // Start with a simple setup
 // to draw lines... 

// Version 1: Vary the stroke color

// Version 2: Vary the radius a little using noise

float angle;
   float radius;
   float cx, cy;
   float x1, y1, x2, y2;
   float strokeColor; 

float strokeDelta; // Define this (V1)
   float radiusNoise; // Add noise to radius (V2)
   void setup() {
   size(500, 500);
   smooth();
   background(255);

 // Initial settings
   cx = width/2;
   cy = height/2;
   radius = width/2;
   angle = 0; // degrees 
   strokeColor = 0;

 strokeDelta = 1; // stroke color will change by 1 (V1)
   radiusNoise = random(10); // Variation in radius (V2)
   } // setup

void draw() {

 angle = angle - 3;
   float theta = radians(angle);

 // vary the radius a little (V2)
   radiusNoise += 0.005;
   radius = noise(radiusNoise)*width/2;

 // compute the end points of line
   x1 = cx + radius * cos(theta);
   y1 = cy + radius * sin(theta);

 x2 = cx + radius * cos(theta+PI);
   y2 = cy + radius * sin(theta+PI);

 // Draw the line
   // Modify stroke color properties (V1)
   strokeColor = strokeColor + strokeDelta;
   if (strokeColor > 255 || strokeColor < 0) {
   strokeDelta = strokeDelta * -1;
   }

 stroke(strokeColor);
   strokeWeight(1);
   line(x1, y1, x2, y2);
   } // draw()