sketch/lines/lines.pde

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), ia = atan(sqrt(.5));

void push() {
  pushMatrix();
  pushStyle();
}

void pop() {
  popStyle();
  popMatrix();
}

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("fr###.png");
    println(frameCount,"/",numFrames);
    if (frameCount==numFrames)
      exit();
  }
}

int samplesPerFrame = 5;
int numFrames = 50;
float shutterAngle = 1.5;

boolean recording = true;

void setup(){
 size(500,500);
 result = new int[width*height][3];
}

void draw_(){
  background(0);

  float t = 1.0*(frameCount-1)/numFrames;

  stroke(20 + 225 * sin(TWO_PI*t), 20 + 255 * cos(TWO_PI*t), 170);
//  fill(color(50 * sin(TWO_PI*t), 0,0));
  strokeWeight(4 + 2 * sin(TWO_PI*t));



//  line(250,250+50*cos(TWO_PI*t),250,250+50*sin(TWO_PI*t));
//  line(250+50*cos(TWO_PI*t),250,250+50*sin(TWO_PI*t),250);
  for (int i = 230; i <= 250; i += 5) {
    //line(i+50*cos(TWO_PI*t),i+50*sin(TWO_PI*t),i-50*sin(TWO_PI*t),i+50*cos(TWO_PI*t));
    //line(i+50*sin(TWO_PI*t),i+50*cos(TWO_PI*t),i+50*cos(TWO_PI*t),i-50*cos(TWO_PI*t));
    //line(i+50*cos(TWO_PI*t),i-50*cos(TWO_PI*t),i+50*sin(TWO_PI*t),i-50*sin(TWO_PI*t));
    line(i-50*cos(TWO_PI*t),i+50*cos(TWO_PI*t),i+50*sin(TWO_PI*t),i+50*sin(TWO_PI*t));
    line(i+50*cos(TWO_PI*t),i-50*cos(TWO_PI*t),i-50*sin(TWO_PI*t),i-50*sin(TWO_PI*t));
    //line(i-50*cos(TWO_PI*t),i+50*cos(TWO_PI*t),i+50*sin(TWO_PI*t),i-50*sin(TWO_PI*t));
    line(i+50*sin(TWO_PI*t),i-50*sin(TWO_PI*t),i-50*cos(TWO_PI*t),i-50*cos(TWO_PI*t));
    line(i-50*sin(TWO_PI*t),i+50*sin(TWO_PI*t),i+50*cos(TWO_PI*t),i+50*cos(TWO_PI*t));
  }
  if(frameCount<=numFrames){
    saveFrame("fr###.png");
  }
}