/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.VvOZn5eUiyZ/rev.8
 * 
 * authors: 
 *   GoToLoop

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



/** 
 * Follow My Lead Closely! (v3.03)
 * by  jordanorelli (2014/Feb)
 * mod GoToLoop
 *
 * forum.processing.org/two/discussion/2846/my-first-code
 *
 * studio.processingtogether.com/sp/pad/export/ro.90vdKMfkiO$zf/latest
 */

static final color LEADER_C = #B22222, CHASER_C = #1874CD;
static final int DIM = 050, GAP = 10;
final PVector[] hist = new PVector[GAP];
int idx;

void setup() {
  size(600, 600, JAVA2D);
  frameRate(60);
  smooth(4);
  noStroke();
  noCursor();
  ellipseMode(CENTER);

  mouseX = mouseY = width<<1;
  for (int i = GAP; i-- != 0; hist[i] = new PVector(mouseX, mouseY));
}

void draw() {
  background(-1);

  hist[idx].set(mouseX, mouseY);
  final PVector old = hist[idx = (idx + 1) % GAP];

  fill(CHASER_C);
  ellipse(old.x, old.y, DIM, DIM);

  fill(LEADER_C);
  ellipse(mouseX, mouseY, DIM, DIM);
}