videoGlitch

// The Nature of Code
// Daniel Shiffman
// http://natureofcode.com

// Demonstration of Craig Reynolds' "Flocking" behavior
// See: http://www.red3d.com/cwr/
// Rules: Cohesion, Separation, Alignment

// Click mouse to add boids into the system

// video stuff added by Jerome Herr

import processing.video.*;
import com.hamoid.*;

VideoExport videoExport;
Movie movie;

Flock flock;

void setup() {
  size(1280, 720);
  background(238);
  //frameRate(30);
  movie = new Movie(this, "beyonce.mp4");
  movie.play();
  flock = new Flock();
  // Add an initial set of boids into the system
  for (int i = 0; i < 350; i++) {
    Boid b = new Boid(width/2, height/2);
    flock.addBoid(b);
  }
    videoExport = new VideoExport(this, "internetVideo" + random(9999) + ".mp4");
  //videoExport.setFrameRate(30);
  videoExport.startMovie();
}

void draw() {
  //background(255);
  flock.run();
  videoExport.saveFrame();
  // Instructions
  //fill(0);
  //text("Drag the mouse to generate new boids.", 10, height-16);
}

// Add a new boid into the System
void mouseDragged() {
  //flock.addBoid(new Boid(mouseX, mouseY));
}

void movieEvent(Movie movie) {
  movie.read();
}

void mouseReleased() {
  //save(random(99999)+".png");
}
void keyPressed() {
  if (key == 'q') {
    videoExport.endMovie();
    //exit();
  }
}

// The Nature of Code
// Daniel Shiffman
// http://natureofcode.com

// Boid class
// Methods for Separation, Cohesion, Alignment added

class Boid {

  PVector position;
  PVector velocity;
  PVector acceleration;
  float r;
  float maxforce;    // Maximum steering force
  float maxspeed;    // Maximum speed
  int sz;

  Boid(float x, float y) {
    acceleration = new PVector(0, 0);
    velocity = new PVector(random(-1, 1), random(-1, 1));
    position = new PVector(x, y);
    r = 3.0;
    maxspeed = 3;
    maxforce = 0.05;
  }

  void run(ArrayList<Boid> boids) {
    flock(boids);
    update();
    borders();
    render();
  }

  void applyForce(PVector force) {
    // We could add mass here if we want A = F / M
    acceleration.add(force);
  }

  // We accumulate a new acceleration each time based on three rules
  void flock(ArrayList<Boid> boids) {
    PVector sep = separate(boids);   // Separation
    PVector ali = align(boids);      // Alignment
    PVector coh = cohesion(boids);   // Cohesion
    // Arbitrarily weight these forces
    sep.mult(1.5);
    ali.mult(1.0);
    coh.mult(1.0);
    // Add the force vectors to acceleration
    applyForce(sep);
    applyForce(ali);
    applyForce(coh);
  }

  // Method to update position
  void update() {
    // Update velocity
    velocity.add(acceleration);
    // Limit speed
    velocity.limit(maxspeed);
    position.add(velocity);
    // Reset accelertion to 0 each cycle
    acceleration.mult(0);
  }

  // A method that calculates and applies a steering force towards a target
  // STEER = DESIRED MINUS VELOCITY
  PVector seek(PVector target) {
    PVector desired = PVector.sub(target, position);  // A vector pointing from the position to the target
    // Normalize desired and scale to maximum speed
    desired.normalize();
    desired.mult(maxspeed);
    // Steering = Desired minus Velocity
    PVector steer = PVector.sub(desired, velocity);
    steer.limit(maxforce);  // Limit to maximum steering force
    return steer;
  }

  void render() {
    sz = (int) random(20, 50);
    PImage tmp = movie.get(int(position.x), int(position.y), sz, sz);
    tint(255, 100);
    image(tmp, position.x, position.y);
  }

  void render_old() {
    // Draw a triangle rotated in the direction of velocity
    float theta = velocity.heading2D() + radians(90);
    fill(175);
    stroke(0);
    pushMatrix();
    translate(position.x, position.y);
    rotate(theta);
    beginShape(TRIANGLES);
    vertex(0, -r*2);
    vertex(-r, r*2);
    vertex(r, r*2);
    endShape();
    popMatrix();
  }

  // Wraparound
  void borders() {
    if (position.x < -r) position.x = width+r;
    if (position.y < -r) position.y = height+r;
    if (position.x > width+r) position.x = -r;
    if (position.y > height+r) position.y = -r;
  }

  // Separation
  // Method checks for nearby boids and steers away
  PVector separate (ArrayList<Boid> boids) {
    float desiredseparation = 25.0f;
    PVector steer = new PVector(0, 0, 0);
    int count = 0;
    // For every boid in the system, check if it's too close
    for (Boid other : boids) {
      float d = PVector.dist(position, other.position);
      // If the distance is greater than 0 and less than an arbitrary amount (0 when you are yourself)
      if ((d > 0) && (d < desiredseparation)) {
        // Calculate vector pointing away from neighbor
        PVector diff = PVector.sub(position, other.position);
        diff.normalize();
        diff.div(d);        // Weight by distance
        steer.add(diff);
        count++;            // Keep track of how many
      }
    }
    // Average -- divide by how many
    if (count > 0) {
      steer.div((float)count);
    }

    // As long as the vector is greater than 0
    if (steer.mag() > 0) {
      // Implement Reynolds: Steering = Desired - Velocity
      steer.normalize();
      steer.mult(maxspeed);
      steer.sub(velocity);
      steer.limit(maxforce);
    }
    return steer;
  }

  // Alignment
  // For every nearby boid in the system, calculate the average velocity
  PVector align (ArrayList<Boid> boids) {
    float neighbordist = 50;
    PVector sum = new PVector(0, 0);
    int count = 0;
    for (Boid other : boids) {
      float d = PVector.dist(position, other.position);
      if ((d > 0) && (d < neighbordist)) {
        sum.add(other.velocity);
        count++;
      }
    }
    if (count > 0) {
      sum.div((float)count);
      sum.normalize();
      sum.mult(maxspeed);
      PVector steer = PVector.sub(sum, velocity);
      steer.limit(maxforce);
      return steer;
    } else {
      return new PVector(0, 0);
    }
  }

  // Cohesion
  // For the average position (i.e. center) of all nearby boids, calculate steering vector towards that position
  PVector cohesion (ArrayList<Boid> boids) {
    float neighbordist = 50;
    PVector sum = new PVector(0, 0);   // Start with empty vector to accumulate all positions
    int count = 0;
    for (Boid other : boids) {
      float d = PVector.dist(position, other.position);
      if ((d > 0) && (d < neighbordist)) {
        sum.add(other.position); // Add position
        count++;
      }
    }
    if (count > 0) {
      sum.div(count);
      return seek(sum);  // Steer towards the position
    } else {
      return new PVector(0, 0);
    }
  }
}

// The Nature of Code
// Daniel Shiffman
// http://natureofcode.com

// Flock class
// Does very little, simply manages the ArrayList of all the boids

class Flock {
  ArrayList<Boid> boids; // An ArrayList for all the boids

  Flock() {
    boids = new ArrayList<Boid>(); // Initialize the ArrayList
  }

  void run() {
    for (Boid b : boids) {
      b.run(boids);  // Passing the entire list of boids to each boid individually
    }
  }

  void addBoid(Boid b) {
    boids.add(b);
  }

}