Code used for A Perfect Circle

A_Perfect_Circle.pde

import processing.video.*; 
import processing.pdf.*;
Capture video; 
PGraphics topLayer; 
PGraphics topLayer2;
color trackColor;
float hue = 0;

int xorig=width/2, yorig=height/2;
int xprev=width/2, yprev=height/2;
int xprev2=width/2, yprev2=height/2;

void setup() { 
  size(1280, 720); 
  smooth();
  noStroke();
  String[] cameras = Capture.list();
  video = new Capture(this, 1280, 720, cameras[0]);
  video.start(); 
  trackColor = color(255, 25, 255);
  topLayer = createGraphics(width, height, g.getClass().getName());
  topLayer2 = createGraphics(width, height, PDF, "output.pdf");
  topLayer2.beginDraw();
  topLayer2.colorMode(HSB, 360, 100, 100);
} 


void draw() { 
  hue = (hue + 1) % 360;
  if (video.available()) { 
    video.read();
  }
  image(video, 0, 0);

  float worldRecord = 500; 
  int closestX = 0; 
  int closestY = 0; 
  int closestX2 = 0; 
  int closestY2 = 0; 
  
  for (int x = 0; x < video.width; x ++ ) { 
    for (int y = 0; y < video.height; y ++ ) { 
      int loc = x + y*video.width; 
      color currentColor = video.pixels[loc]; 
      float r1 = red(currentColor); 
      float g1 = green(currentColor); 
      float b1 = blue(currentColor); 
      float r2 = red(trackColor); 
      float g2 = green(trackColor); 
      float b2 = blue(trackColor); 
      float d = dist(r1, g1, b1, r2, g2, b2); 
      if (d < worldRecord) { 
        worldRecord = d; 
        closestX = x; 
        closestY = y;
        closestX2 = x; 
        closestY2 = y;
        
        
      }
    }
  }
    video.loadPixels();

  
  //topLayer2.stroke(trackColor);
  if (worldRecord < 10) { 
    topLayer2.strokeWeight(3);
    topLayer2.stroke(hue, 100, 100);
    if (xprev != xorig && yprev != yorig) topLayer2.line(xprev, yprev, closestX, closestY);
    xprev = closestX;
    yprev = closestY;
  }

  topLayer.beginDraw();
  topLayer.colorMode(HSB, 360, 100, 100);
  if (worldRecord < 10) { 
    topLayer.strokeWeight(3);
    topLayer.stroke(hue, 100, 100);
    if (xprev2 != xorig && yprev2 != yorig) topLayer.line(xprev2, yprev2, closestX2, closestY2);
    xprev2 = closestX2;
    yprev2 = closestY2;
  }
  
  topLayer.endDraw();
  image(topLayer, 0, 0);
  
} 


void mousePressed() { 
  int loc = mouseX + mouseY*video.width; 
  trackColor = video.pixels[loc];
  //trackColor = hue;
}

void keyPressed() {
  if (key == 'q') {
    topLayer2.dispose();
    topLayer2.endDraw();
  }
}