// Daniel Shiffman

// http://natureofcode.com

​

// Reference to physics world

var physics;

​

// Our "Chain" object

var chain;

// Our helicopter

let heli;

let boxy;

let isSteering = false;

let roll = 0;

let torque = 0;

let hook = false;

function setup() {

  createCanvas(600,400);

  angleMode(DEGREES);

  // Initialize the physics

  physics=new VerletPhysics2D();

  physics.addBehavior(new GravityBehavior(new Vec2D(0,0.5)));

​

  // Set the world's bounding box

  physics.setWorldBounds(new Rect(0,0,width,height));

  heli = new Helicopter(1,random(width), height-25);

  boxy = new Cargo(random(width), random(height));

  // Initialize the chain

  // chain = new Chain(180, 20, 16, 0.2);

}

​

function draw() {

​

  // Update the physics world

  physics.update();

​

  background(220);

​

  // Update physics

  physics.update();

  // Update chain's tail according to mouse position 

  // chain.updateHead(mouseX, mouseY);

  // Display chain

  //   let d = dist(heli.chain.head.x,heli.chain.head.y,heli.chain.tail.x,heli.chain.tail.y);

  //   if(d < 100 && (heli.chain.tail.y - heli.chain.head.y) < 100){

  //   hook = true;

  //   }

  // Helicopter and Chain

  heli.chain.display();

  heli.chain.tail.displayTail();

  heli.update();

  heli.display(isSteering); 

  gravity = createVector(0, 0.01);

  heli.applyForce(gravity);

  let collective = createVector(roll, -torque);

  heli.applyForce(collective);

  if (mouseIsPressed) {

  let wind = new Vec2D(10, 0);

  heli.chain.tail.addForce(wind);

  }

//   if (keyIsDown(LEFT_ARROW)) {

//   }

  //Cargo

  // boxy.display();

  if (keyIsPressed === true) {

​

    if (keyCode === LEFT_ARROW) {

      roll -= 0.001;

      torque -= 0.0005;

      isSteering = true;

      heli.rotorAngle -= 1;

    } else if (keyCode === RIGHT_ARROW) {

      roll += 0.001;

      torque -= 0.0005;

      isSteering = true;

      heli.rotorAngle += 1;

    }

    if (keyCode === UP_ARROW) {

      torque = 0.02;

    } else if (keyCode === DOWN_ARROW) {

      torque -= 0.001;

    }

  }

}

// function mousePressed() {

//   // Check to see if we're grabbing the chain

//   chain.contains(mouseX, mouseY);

// }

​

// function mouseReleased() {

//   // Release the chain

//   chain.release();

// }

​

​

// function keyReleased(){

//  isSteering = false;

// }

​

​

​