/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.rOK3zqH-Yrx/rev.17
 * 
 * authors: 
 *   GoToLoop

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



/**
 * Chase-Shadow Circles (v3.21)
 * Regular Array Edition (2013/Feb)
 *
 * Modded by GoToLoop (2013/Nov)
 *
 * forum.processing.org/topic/newbie-question-understandig-problems-with-arrays
 * studio.processingtogether.com/sp/pad/export/ro.9GTDpA6dp4tH1/latest
 * www.creativecoding.org/lesson/basics/processing/arrays
 */

static final int NUM = 0100, NEWEST = NUM - 1;
final int[] x = new int[NUM], y = new int[NUM];

void setup() {
  size(1000, 400, JAVA2D);

  frameRate(60);
  smooth(4);
  noStroke();
  noCursor();
  ellipseMode(CENTER);

  fill(0100<<030);

  mouseX = width>>1;
  mouseY = height>>1;

  for ( int i = NUM; i-- != 0; 
    x[i] = mouseX, y[i] = mouseY );
}

void draw() {
  background(-1);

  for ( int i = 0; i != NEWEST;
    ellipse(x[i] = x[i + 1], y[i] = y[i + 1], i, i++) );

  ellipse(x[NEWEST] = mouseX, y[NEWEST] = mouseY, NEWEST, NEWEST);
}