swimmer

swimmer.pde

// by david whyte >:)

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

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

int samplesPerFrame = 8;
int numFrames = 70;        
float shutterAngle = .5;

boolean recording = true;

void setup_() {
  size(800, 600);
  rectMode(CENTER);
  fill(32);
  noStroke();
}

float x, y, x_, y_, tt;
float d = 16, sp = 30;
float th;
float r = 15;

void draw_() {
  background(250); 
  pushMatrix();
  translate(width/2, height/2);
  rotate(QUARTER_PI);
  scale(1.0);
  background(20);
  fill(250);
  noStroke();
  for (int i=0; i<8; i++) {
    for (int j=0; j<8; j++) {
      x = (i-3.5)*sp;
      y = (j-3.5)*sp;

      x_ = x + r*cos(TWO_PI*t + PI - .011*y);
      y_ = y + r*cos(TWO_PI*t + PI - .011*x);
      pushMatrix();
      ellipse(x_, y_, d, d);
      popMatrix();
    }
  }

  popMatrix();
}