Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <div class="instructions">
  Click and drag Sticky the marshmallow!<br>
  See how it was built <a href="https://codepen.io/MarioD/post/hot-and-sticky-the-process" target="_blank">here</a>.
</div>
  <div class="height-warning"></div>
              
            
!

CSS

              
                /* apply a natural box layout model to all elements, but allowing components to change */
html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

body {
  background: #fee096;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.height-warning {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background: #fee096 url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/49240/height.png) center no-repeat;
  background-size: auto 40%;
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
  z-index: 10;
}

@media(max-height: 499px) {
  .height-warning {
    opacity: 1;
  }
}

.instructions {
  display: none;
  line-height: 26px;
}

.instructions a {
  color: #7f6e4a;
}

@media(min-width: 768px) {
  .instructions {
    z-index: 5;
    position: absolute;
    top: 20px;
    left: 20px;
    color: #b79e6a;
    display: block;
    font-family: 'Open Sans', sans-serif;
    font-weight: 300;
    font-size: 13px;
    letter-spacing: 0.010em;
  }
}
              
            
!

JS

              
                // Module aliases
var Engine = Matter.Engine,
    World = Matter.World,
    Bodies = Matter.Bodies,
    Body = Matter.Body,
    Constraint = Matter.Constraint,
    Composite = Matter.Composite,
    Composites = Matter.Composites,
    MouseConstraint = Matter.MouseConstraint,
    Mouse = Matter.Mouse,
    Events = Matter.Events,
    Vertices = Matter.Vertices;

var engine = Engine.create();
var world = engine.world;

var floor;
var cup;
var cupLeft;
var cupRight;
var cupHandle;

var chain = null;
var heatLines = [];

var distanceToCup = 10000;
var distanceFromCup = {size: 500, towards: true};
var firstAnimation = {max: 241, min: 171, percent: 1};
var secondAnimation = {max: 170, min: 100, percent: 0};
var thirdAnimation = {max: 241, min: 100, percent: 0};



// ---------------
// Box Constructor
// ---------------

function Box(x, y, w, h, options) {
  this.w = w;
  this.h = h;
  this.body = Bodies.rectangle(x, y, w, h, options);

  World.add(world, this.body);
}



//
function calculateLinks() {
  // 77 is the offset from the bottom and the top
  // 200 is the amount of space we want between the marshmallow and cup when hanging
  var spaceLeft = window.innerHeight - (125 + 100 + 77 + 200);
  var links = spaceLeft / 26;

  if(links < 3) {
    return Math.ceil(3);
  } else if(links > 6) {
    return Math.ceil(6);
  } else {
    return Math.ceil(links);
  }
}



// ------------
// Create chain
// ------------

function CreateChain(x, y, chainLinks, linkLength) {
  this.x = x;
  this.y = y;
  this.hinges = [];
  this.constraints = [];
  this.chainLinks = chainLinks;
  this.linkLength = linkLength;
}

CreateChain.prototype.remove = function() {
  for(let i = 0; i < this.constraints.length; i++) {
    World.remove(world, this.constraints[i]);
  }

  chain = null;
};

CreateChain.prototype.init = function() {
  // Create hinges
  for(var i = 0; i < this.chainLinks; i++) {
    var staticCheck = (i === 0) ? true : false ;

    var anchor = new Box(this.x, this.y + (this.linkLength * i), 5, 5, {
      isStatic: staticCheck,
      collisionFilter: {
        category: 0x0001
      }
    });

    this.hinges.push(anchor);
  }

  // Create links between hinges
  for(let i = 0; i < this.hinges.length; i++) {
    var constraint;

    if(i === this.chainLinks - 1) {
      constraint = Constraint.create({
        bodyA: this.hinges[i].body,
        bodyB: marshmallow.body,
        pointB: { x: 0, y: (marshmallow.h/2 * -1) + 12 },
        length: this.linkLength,
        damping: 0.5,
        stiffness: 0.1,
        label: 'marshmallowAttachment'
      });
    } else {
      constraint = Constraint.create({
        bodyA: this.hinges[i].body,
        bodyB: this.hinges[i + 1].body,
        length: this.linkLength,
        damping: 0.5,
        stiffness: 0.1
      });
    }

    this.constraints.push(constraint);
    World.add(world, constraint);
  }
};

function createChain() {
  chain = new CreateChain(width/2, 50, calculateLinks(), 10);
  chain.init();
}



// --------------
// Heat particles
// --------------

function HeatParticle(x, y) {
  this.position = createVector(x, y);
  this.index = 0;
}

HeatParticle.prototype.render = function() {
  push();
  noStroke();
  fill('#f0d38d');
  ellipse(this.position.x, this.position.y, this.parent.particleSize);
  pop();
};

HeatParticle.prototype.updatePos = function() {
  this.position.y -= 0.5;
  this.position.x = Math.sin((frameCount + this.index/0.4) / 35) * 10 + this.parent.position.x;
};

HeatParticle.prototype.checkPos = function() {
  if(this.position.y < this.parent.position.y - this.parent.height) {
    this.reset();
  }
};

HeatParticle.prototype.reset = function() {
  this.parent.particleIndex += 1;
  this.index = this.parent.particleIndex;
  this.position.y = this.parent.position.y;
};



// ----------
// Heat lines
// ----------

function HeatLine(x, y, height, particleSize) {
  this.position = createVector(x, y);
  this.particles = [];
  this.particleIndex = 0;
  this.height = height;
  this.particleSize = particleSize;
}

HeatLine.prototype.render = function() {
  for(var i = 0; i < this.particles.length; i++) {
    this.particles[i].updatePos();
    this.particles[i].render();
    this.particles[i].checkPos();
  }
};

HeatLine.prototype.init = function() {
  var particleCount = this.height / (this.particleSize / 6);

  for(var i = 0; i < particleCount; i++) {
    this.particleIndex += 1;

    var particle = new HeatParticle(this.position.x, this.position.y + (i * this.particleSize / 6));
        particle.index = this.particleIndex;
        particle.parent = this;

    this.particles.push(particle);
  }
};

function populateHeatLines() {
  heatLines.push(new HeatLine(cup.body.position.x, cup.body.position.y - cup.h/2, 50, 5));
  heatLines.push(new HeatLine(cup.body.position.x - 60, cup.body.position.y - cup.h/2, 50, 5));
  heatLines.push(new HeatLine(cup.body.position.x + 60, cup.body.position.y - cup.h/2, 50, 5));

  for(var i = 0; i < heatLines.length; i++) {
    heatLines[i].init();
  }
}



// -----------
// Cup + Floor
// -----------
// Change this to an object since we don't need it to construct anything

function CupFloor() {}

CupFloor.prototype.destroy = function() {
  World.remove(world, [
    floor.body,
    cup.body,
    cupLeft.body,
    cupRight.body,
    cupHandle.body,
  ]);

  floor = null;
  cup = null;
  cupLeft = null;
  cupRight = null;
  cupHandle = null;
};

CupFloor.prototype.init = function() {
  // All of the magic numbers here are to position the elements relative to the marshmallow body
  floor = new Box(width/2, height - 31.75, 320, 3.5, {isStatic: true, collisionFilter: {category: 0x0002}});
  cup = new Box(width/2, height - 93, 259, 125.5, {isStatic: true, isSensor: true, label: 'cup', collisionFilter: {category: 0x0002}});
  cupLeft = new Box(width/2 - 134.5, height - 93, 10, 125.5, {isStatic: true, collisionFilter: {category: 0x0002}});
  cupRight = new Box(width/2 + 134.5, height - 93, 10, 125.5, {isStatic: true, collisionFilter: {category: 0x0002}});
  cupHandle = new Box(width/2 + 153, height - 114, 31, 60.5, {isStatic: true, collisionFilter: {category: 0x0002}});
};

var cupFloor = new CupFloor();



// ---------
// P5 Resize
// ---------

function windowResized() {
  resizeCanvas(windowWidth, windowHeight);

  cupFloor.destroy();
  cupFloor.init();

  heatLines = [];
  populateHeatLines();

  marshmallow.body.isStatic = true;
  marshmallow.body.angle = 0;

  if(chain) {
    chain.remove();
  }
  createChain();

  marshmallow.body.isStatic = false;

  Body.setVelocity(marshmallow.body, {
    x: 0,
    y: 0
  });

  marshmallow.angularVelocity = 0;
  marshmallow.angularSpeed = 0;

  firstAnimation.percent = 0;
  secondAnimation.percent = 0;
  thirdAnimation.percent = 0;
}



// --------
// P5 Setup
// --------

function setup() {

  // Setup the canvas
  var canvas = createCanvas(windowWidth, windowHeight);
  rectMode(CENTER);

  // Setup the mouse events
  var mouse = Mouse.create(canvas.elt);
      mouse.pixelRatio = pixelDensity();

  var mouseConstraint = MouseConstraint.create(engine, {mouse: mouse, constraint: {stiffness: 0.2}});
      mouseConstraint.collisionFilter.category = 0x0002;

  World.add(world, mouseConstraint);

  // Load all of the image assets
  marshmallowBody = loadImage('https://s3-us-west-2.amazonaws.com/s.cdpn.io/49240/body.png');
  floorImg = loadImage('https://s3-us-west-2.amazonaws.com/s.cdpn.io/49240/ground.png');
  cupImg = loadImage('https://s3-us-west-2.amazonaws.com/s.cdpn.io/49240/cup.png');
  cupHandleImg = loadImage('https://s3-us-west-2.amazonaws.com/s.cdpn.io/49240/cupHandle.png');

  // Create the boundaries
  cupFloor.init();


  // -----------
  // Marshmallow
  // -----------
  // The marshmallow code below is very messy and should be refactored into a constructor

  marshmallow = new Box(width/2, 0, 80, 100, {
    density: 0.00001,
    label: 'marshmallow',
    collisionFilter: {
      category: 0x0001,
      mask: 0x0002
    }
  });

  createChain();

  armLeft = Bodies.circle(width/2 - 40, 300, 5, {
    collisionFilter: {
      category: 0x0001
    },
    density: 0.00001
  });

  armRight = Bodies.circle(width/2 + 40, 300, 5, {
    collisionFilter: {
      category: 0x0001
    },
    density: 0.00001
  });

  var legRight = Bodies.circle(width/2 + 20, 300 + 50, 0.1, {
    collisionFilter: {
      category: 0x0001
    },
    density: 0.00001
  });

  var legLeft = Bodies.circle(width/2 - 20, 300 + 50, 0.1, {
    collisionFilter: {
      category: 0x0001
    },
    density: 0.00001
  });

  constraintArmLeft = Constraint.create({
    bodyA: marshmallow.body,
    bodyB: armLeft,
    pointA: { x: -39, y: -20 },
    length: 40,
    damping: 0.5,
    stiffness: 1,
    label: 'limb'
  });

  constraintArmRight = Constraint.create({
    bodyA: marshmallow.body,
    bodyB: armRight,
    pointA: { x: 39, y: -20 },
    length: 40,
    damping: 0.5,
    stiffness: 1,
    label: 'limb'
  });

  constraintLegRight = Constraint.create({
    bodyA: marshmallow.body,
    bodyB: legRight,
    pointA: { x: 20, y: 49 },
    length: 30,
    damping: 0.5,
    stiffness: 1,
    label: 'limb'
  });

  constraintLegLeft = Constraint.create({
    bodyA: marshmallow.body,
    bodyB: legLeft,
    pointA: { x: -20, y: 49 },
    length: 30,
    damping: 0.5,
    stiffness: 1,
    label: 'limb'
  });

  World.add(world, [
    armLeft,
    armRight,
    legRight,
    legLeft,
    constraintArmLeft,
    constraintArmRight,
    constraintLegRight,
    constraintLegLeft
  ]);

  // Create and initialize the heat lines
  populateHeatLines();

  // Start the engine
  Engine.run(engine);
}



// -------
// P5 Draw
// -------

function draw() {
  clear();

  // ----------------------
  // Outline matter objects
  // ----------------------

  // push();
  // var bodies = Composite.allBodies(engine.world);
  //
  // drawingContext.beginPath();
  // for (var i = 0; i < bodies.length; i += 1) {
  //   var vertices = bodies[i].vertices;
  //   drawingContext.moveTo(vertices[0].x, vertices[0].y);
  //   for (var j = 1; j < vertices.length; j += 1) {
  //     drawingContext.lineTo(vertices[j].x, vertices[j].y);
  //   }
  //   drawingContext.lineTo(vertices[0].x, vertices[0].y);
  // }
  //
  // drawingContext.lineWidth = 1;
  // drawingContext.strokeStyle = '#9e9e9e';
  // drawingContext.stroke();
  // pop();


  if(cup) {
    // heatLines
    for(var i = 0; i < heatLines.length; i++) {
      heatLines[i].render();
    }
  }


  // --------------------
  // Draw the marshmallow
  // --------------------

  push();
  translate(marshmallow.body.position.x, marshmallow.body.position.y);
  rotate(marshmallow.body.angle);
  image(marshmallowBody, marshmallow.w/2 * -1, marshmallow.h/2 * -1, marshmallow.w, marshmallow.h);
  pop();



  // --------------
  // Draw the chain
  // --------------

  var allConstraints = Composite.allConstraints(engine.world);
  var marshmallowAttachment;

  // Rope hole at the top of the page
  if(chain) {
    push();
    noStroke();
    fill('black');
    ellipse(chain.x, chain.y, 25, 6);
    pop();
  }

  for(let i = 0; i < allConstraints.length; i++) {
    if(allConstraints[i].label === 'marshmallowAttachment') {
      marshmallowAttachment = allConstraints[i];
    }

    if(allConstraints[i].label !== 'Mouse Constraint') {
      push();
      strokeWeight(2.5);

      line(
        allConstraints[i].bodyA.position.x + allConstraints[i].pointA.x,
        allConstraints[i].bodyA.position.y + allConstraints[i].pointA.y,
        allConstraints[i].bodyB.position.x + allConstraints[i].pointB.x,
        allConstraints[i].bodyB.position.y + allConstraints[i].pointB.y
      );
      pop();
    }
  }

  // Rope attachment on top of head
  if(marshmallowAttachment) {
    push();
    noStroke();
    fill('black');
    translate(marshmallowAttachment.bodyB.position.x + marshmallowAttachment.pointB.x, marshmallowAttachment.bodyB.position.y + marshmallowAttachment.pointB.y);
    rotate(marshmallow.body.angle);
    ellipse(0, 0, 10, 3);
    pop();
  }

  // Draw arms
  push();
  strokeWeight(2.5);
  ellipse(armLeft.position.x, armLeft.position.y, 10);
  ellipse(armRight.position.x, armRight.position.y, 10);
  pop();

  // When the arms enter the cup, raise them
  if(cup) {
    if(marshmallow.body.position.y / height > 0.75 && marshmallow.body.position.x > cup.body.position.x - cup.w/2 && marshmallow.body.position.x < cup.body.position.x + cup.w/2) {
      Matter.Body.setVelocity(armLeft, { x: 0, y: -3 });
      Matter.Body.setVelocity(armRight, { x: 0, y: -3 });
    }
  }

  // Facial expression

  if(cup) {
    distanceToCup = Math.sqrt(Math.pow(marshmallow.body.position.x - cup.body.position.x, 2) + Math.pow(marshmallow.body.position.y - cup.body.position.y, 2));
  } else {
    distanceToCup = 1000;
  }

  if(distanceToCup <= firstAnimation.max && distanceToCup >= firstAnimation.min) {
    firstAnimation.percent = (distanceToCup - firstAnimation.min) / (firstAnimation.max - firstAnimation.min);
  }

  if(distanceToCup < secondAnimation.max && distanceToCup >= secondAnimation.min) {
    secondAnimation.percent = ((distanceToCup - secondAnimation.min) / (secondAnimation.max - secondAnimation.min) - 1) * -1;
  }

  if(distanceToCup < thirdAnimation.max && distanceToCup >= thirdAnimation.min) {
    thirdAnimation.percent = ((distanceToCup - thirdAnimation.min) / (thirdAnimation.max - thirdAnimation.min) - 1) * -1;
  }

  if(distanceToCup < secondAnimation.max) {
    firstAnimation.percent = 0;
  }

  if(distanceToCup > firstAnimation.max) {
    firstAnimation.percent = 1;
    secondAnimation.percent = 0;
  }

  // Marshmallow eye left
  push();
  translate(marshmallow.body.position.x, marshmallow.body.position.y);
  strokeWeight(3);
  noFill();
  rotate(marshmallow.body.angle);
  bezier(
    -20, -5 + (secondAnimation.percent * 5)  + (secondAnimation.percent * -4),
    -20, -5 + (firstAnimation.percent * -7) + (secondAnimation.percent * 5) + (secondAnimation.percent * -4),
    -10, -5 + (firstAnimation.percent * -7) + (secondAnimation.percent * -4),
    -10, -5 + (secondAnimation.percent * -4)
  );
  pop();

  // Marshmallow eye right
  // The second parameter, (secondAnimation.percent * -4), is to move the item up when the animation happens
  push();
  translate(marshmallow.body.position.x, marshmallow.body.position.y);
  strokeWeight(3);
  noFill();
  rotate(marshmallow.body.angle);
  bezier(
    20, -5 + (secondAnimation.percent * 5) + (secondAnimation.percent * -4),
    20, -5 + (firstAnimation.percent * -7) + (secondAnimation.percent * 5) + (secondAnimation.percent * -4),
    10, -5 + (firstAnimation.percent * -7) + (secondAnimation.percent * -4),
    10, -5 + (secondAnimation.percent * -4)
  );
  pop();

  // Marshmallow mouth
  push();
  stroke('#000');
  strokeJoin(ROUND);
  strokeWeight(2);
  fill('black');
  translate(marshmallow.body.position.x, marshmallow.body.position.y);
  rotate(marshmallow.body.angle);
  arc(0, 12 + (thirdAnimation.percent * 5), 16, firstAnimation.percent * 14, 0, 3.14, CHORD);
  arc(0, 12 + (thirdAnimation.percent * 5), 16, thirdAnimation.percent * 14, 3.14, 0, CHORD);
  pop();



  // ---
  // Cup
  // ---

  if(cup) {
    push();
    noStroke();
    fill('#fee096');
    translate(cup.body.position.x, cup.body.position.y);
    rect(0, 60, cup.w + 20, cup.h + 100);
    pop();

    push();
    translate(floor.body.position.x, floor.body.position.y);
    image(floorImg, floor.w/2 * -1, floor.h/2 * -1, floor.w, floor.h);
    pop();

    push();
    translate(cup.body.position.x, cup.body.position.y);
    image(cupImg, (cup.w/2 * -1) - 10, cup.h/2 * -1, cup.w + 20, cup.h);
    pop();

    push();
    noFill();
    noStroke();
    translate(cupHandle.body.position.x, cupHandle.body.position.y);
    image(cupHandleImg, cupHandle.w/2 * -1, cupHandle.h/2 * -1, cupHandle.w, cupHandle.h);
    pop();

    // Outer eye Left
    push();
    noStroke();
    fill('white');
    translate(cup.body.position.x - 76.5, cup.body.position.y - 5.5);
    ellipse(0, 0, 34);
    rotate(thirdAnimation.percent * 1.3);
    stroke('#812d29');
    strokeWeight(3.5);
    line(-24, 2, 2, -24);
    pop();

    // Outer eye right
    push();
    noStroke();
    fill('white');
    translate(cup.body.position.x + 76.5, cup.body.position.y - 5.5);
    ellipse(0, 0, 34);
    rotate(thirdAnimation.percent * -1.3);
    stroke('#812d29');
    strokeWeight(3.5);
    line(24, -2, -2, -24);
    pop();

    // Cheek right
    push();
    noStroke();
    fill('#f6554f');
    translate(cup.body.position.x + 76.5, cup.body.position.y);
    ellipse(0, 10 + thirdAnimation.percent * 3, 34, 10);
    pop();

    // Cheek left
    push();
    noStroke();
    fill('#ff635b');
    translate(cup.body.position.x - 76.5, cup.body.position.y);
    ellipse(0, 10 + thirdAnimation.percent * 3, 34, 10);
    pop();

    // Blush left
    push();
    noStroke();
    fill('#ff847e');
    translate(cup.body.position.x - 76.5, cup.body.position.y);
    ellipse(-20, 18.5, 18.5, 11);
    pop();

    // Blush right
    push();
    noStroke();
    fill('#ff635b');
    translate(cup.body.position.x + 76.5, cup.body.position.y);
    ellipse(20, 18.5, 18.5, 11);
    pop();

    // Inner eyes
    push();
    noStroke();
    fill('black');
    translate(cup.body.position.x, cup.body.position.y);
    ellipse(
      -76.5 + (marshmallow.body.position.x / width - 0.5) * 10,
      -7 + (marshmallow.body.position.y / height - 0.5) * 10,
      9.5
    );
    ellipse(
      76.5 + (marshmallow.body.position.x / width - 0.5) * 10,
      -7 + (marshmallow.body.position.y / height - 0.5) * 10,
      9.5
    );
    pop();

    // Cup mouth
    push();
    stroke('#812d29');
    strokeJoin(ROUND);
    strokeWeight(2);
    fill('#812d29');
    translate(cup.body.position.x, cup.body.position.y);
    rotate(cup.body.angle);
    arc(0, -10 + (thirdAnimation.percent * 18), 46, firstAnimation.percent * 44, 0, 3.14, CHORD);
    arc(0, -10 + (thirdAnimation.percent * 18), 46, thirdAnimation.percent * 44, 3.14, 0, CHORD);
    pop();
  }
}

              
            
!
999px

Console