// http://forum.processing.org/topic/pdf-export-shapes-misaligned

import processing.pdf.*;

final static boolean RECORD = true;

final static int DIAM = 300;
final static int STEP_X = 15, STEP_Y = 15;

final static float FRACT = 1.15;

final static color BG = #556270;

final color[] palette = {
  #4ECDC4, #C7F464, #FF6B6B, #C44D58
};

void setup() {
  size(960, 645);
  noLoop();

  initialize();   // initializes main canvas setup
}

void draw() {
  if (RECORD) {
    final String path = dataPath("frame-####.pdf");
    beginRecord(PDF, path);

    initialize(); // initializes PDF's own graphics setup
  }

  background (BG);

  final int xx = width;
  final int yy = height + DIAM;

  for (int y = STEP_Y; y < yy; y += DIAM + STEP_Y) {
    for (int x = STEP_X; x < xx; x += DIAM + STEP_X) {
      drawCircle(x, y, DIAM);
    }
  }

  if (RECORD) {
    endRecord();
    println("Frame: #" + frameCount);
  }
}

void mouseClicked() {
  redraw();
}

void drawCircle(int x, int y, float d) {
  fill(palette[(int) random(palette.length)]);
  ellipse(x, y, d, d);

  if (d > 2) {
    drawCircle(x, y, d/FRACT);
  }
}

void initialize() {
  smooth();
  noStroke();
  ellipseMode(CORNER);
}