/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.oPjL5fdhrWr/rev.28
 * 
 * authors: 
 *   GoToLoop

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



/** 
 * Pulsating Boxes (v3.30)
 * by  Jam131 (2014/Jan)
 * mod GoToLoop
 *
 * forum.processing.org/two/discussion/2674/
 * changing-color-of-each-shape-in-an-iteration
 *
 * studio.processingtogether.com/sp/pad/export/ro.9A9O52aqsIjdx/latest
 */

static final int DIM = 050, RAD = DIM >> 1;
static final int STEP = 3, COLORS = 0100;

Pulse[] pulses;

void setup() {
  size(960, 480);
  frameRate(60);
  smooth(4);
  noCursor();
  strokeWeight(5);

  colorMode(HSB, COLORS, 1, 1);

  rectMode(CENTER);
  ellipseMode(CENTER);

  pulses = createPulses();
}

Pulse[] createPulses() { // for rectMode(CENTER)!!!
  final int cols = width/DIM, rows = height/DIM;
  final Pulse[] boxes = new Pulse[rows*cols];

  for (int y = 0; y != rows; ++y)  for (int x = 0; x != cols; ++x)
    boxes[y*cols + x] = new Pulse(x*DIM + RAD, y*DIM + RAD);

  return boxes;
}

void shuffleColors() {
  for (Pulse p: pulses)  p.randColor();
}

void draw() {
  //clear();       // Java
  background(0); // JS

  final float diam = DIM * abs(sin(radians(frameCount*STEP)));
  if (diam < 1e-2)  shuffleColors();

  //frame.setTitle("Diam: " + nf(diam, 2, 2)); // Java only!

  for (Pulse p: pulses)  p.display(diam);

  fill(0, 030);
  stroke(-1);
  ellipse(mouseX, mouseY, DIM + diam*20, DIM + diam*20);
  ellipse(pmouseX, pmouseY, DIM + diam*10, DIM + diam*10);

  fill(-1);
  noStroke();
  rect(mouseX, mouseY, DIM/1.3, DIM/1.3);
}

class Pulse {
  final short x, y;
  color c;

  Pulse(int px, int py) {
    x = (short) px;
    y = (short) py;

    randColor();
  }

  void randColor() { // for colorMode(HSB)!!!
    c = color(random(COLORS), 1, 1);
  }

  void display(float diam) {
    fill(c);
    rect(x, y, diam, diam);
  }

  String toString() {
    return "[ " + x + ", " + y + " ]";
  }
}