gistfile1.pde

// by dave w

int[][] result;
float t, c;

float ease(float p) {
  return 3*p*p - 2*p*p*p;
}

float ease(float p, float g) {
  if (p < 0.5) 
    return 0.5 * pow(2*p, g);
  else
    return 1 - 0.5 * pow(2*(1 - p), g);
}

float mn = .5*sqrt(3);

void setup() {
  setup_();
  result = new int[width*height][3];
}

void draw() {

  if (!recording) {
    t = mouseX*1.0/width;
    c = mouseY*1.0/height;
    if (mousePressed)
      println(c);
    draw_();
  } else {
    for (int i=0; i<width*height; i++)
      for (int a=0; a<3; a++)
        result[i][a] = 0;

    c = 0;
    for (int sa=0; sa<samplesPerFrame; sa++) {
      t = map(frameCount-1 + sa*shutterAngle/samplesPerFrame, 0, numFrames, 0, 1);
      draw_();
      loadPixels();
      for (int i=0; i<pixels.length; i++) {
        result[i][0] += pixels[i] >> 16 & 0xff;
        result[i][1] += pixels[i] >> 8 & 0xff;
        result[i][2] += pixels[i] & 0xff;
      }
    }

    loadPixels();
    for (int i=0; i<pixels.length; i++)
      pixels[i] = 0xff << 24 | 
        int(result[i][0]*1.0/samplesPerFrame) << 16 | 
        int(result[i][1]*1.0/samplesPerFrame) << 8 | 
        int(result[i][2]*1.0/samplesPerFrame);
    updatePixels();

    saveFrame("f###.gif");
    if (frameCount==numFrames)
      exit();
  }
}

//////////////////////////////////////////////////////////////////////////////

int samplesPerFrame = 16;
int numFrames = 72;        
float shutterAngle = .65;

boolean recording = false;

void setup_() {
  size(540, 500,P2D);
  smooth(8);
  rectMode(CENTER);
  fill(32);
  noStroke();
}

float xx(int i, int j) {
  x = i*sp;
  y = (j+1/3.0)*mn*sp;
  if (j%2 == 0)
    x += .5*sp;
  r = dist(x, y, 0, 0);
  th = atan2(y, x);
  r *= pow(1.33, sin(TWO_PI*t-.000035*r*r)*exp(-.00001*r*r));
  return r*cos(th);
}

float yy(int i, int j) {
  x = i*sp;
  y = (j+1/3.0)*mn*sp;
  if (j%2 == 0)
    x += .5*sp;
  r = dist(x, y, 0, 0);
  th = atan2(y, x);
  r *= pow(1.4, sin(TWO_PI*t-.000035*r*r)*exp(-.00001*r*r));
  return r*sin(th);
}

float ans;
float x, y, tt;
float sp = 44;
int N = 8;
float r, th;
float x1, x2, y1, y2;
float ll = .25;

void lin(float x1, float y1, float x2, float y2){
  line(lerp(x1,x2,ll), lerp(y1,y2,ll), lerp(x2,x1,ll), lerp(y2,y1,ll));
}

void draw_() {
  background(28,25,24); 
  pushMatrix();
  translate(width/2, height/2);
  for (int i=-N; i<=N; i++) {
    for (int j=-N; j<=N; j++) {
      fill(255);
      noStroke();
      ellipse(xx(i, j), yy(i, j), 6, 6);
      stroke(255);
      strokeWeight(1.25);
      noFill();
      x1 = xx(i,j); y1 = yy(i,j);
      x2 = xx(i+1,j); y2 = yy(i+1,j);
      lin(x1, y1, x2, y2);
      x2 = xx(i,j+1); y2 = yy(i,j+1);
      lin(x1, y1, x2, y2);
      if (j%2 != 0){
        x2 = xx(i-1, j+1); y2 = yy(i-1, j+1); }
      else{
        x2 = xx(i+1, j+1); y2 = yy(i+1, j+1); }
      lin(x1, y1, x2, y2);
    }
  }
  popMatrix();
}