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              <head>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>

  <canvas id=canvas></canvas>
<body>
  <button id=heat_button data-text-swap="COOL PARTICLE" class="h_heat_button">HEAT PARTICLE</button>
  <button id=reset_button class="h_reset_button">RESET</button>
  
  <img id=plus src="https://res.cloudinary.com/al-ro/image/upload/v1495830786/szl7IYf_fdgg0q.png" title="source: imgur.com" width="0" height="0"/>

  <img id=minus src="https://res.cloudinary.com/al-ro/image/upload/v1495830780/Fr6Morw_eanxki.png" title="source: imgur.com" width="0" height="0"/>
</body>
            
          
!
            
              body {
  background-color: #FFF;    
  margin: 0;
  overflow: hidden;
  background-repeat: no-repeat;
}

button {
  background-color: #459; 
  bottom: 0;
  left: 50%;
  position: absolute;
  border: none;
  color: white;
  padding: 15px 30px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  min-width: 195px
}

.h_heat_button {
  transform: translate(-101%, -20%);
}
.h_reset_button {
  transform: translate(1%, -20%);
}

.v_heat_button {
  transform: translate(-50%, -104%);
}
.v_reset_button {
  transform: translate(-50%, -2%);
}

button:hover {
  box-shadow: 3px 3px 1px 0 rgba(0,0,0,0.19);
}
button:focus {outline:0;}

canvas { display:block; }
            
          
!
            
               const mobile = ( navigator.userAgent.match(/Android/i)
      || navigator.userAgent.match(/webOS/i)
      || navigator.userAgent.match(/iPhone/i)
      || navigator.userAgent.match(/iPad/i)
      || navigator.userAgent.match(/iPod/i)
      || navigator.userAgent.match(/BlackBerry/i)
      || navigator.userAgent.match(/Windows Phone/i)
      );

var ctx = canvas.getContext("2d");
var discs = [];
var initialW = canvas.width = window.innerWidth;
var initialH = canvas.height = window.innerHeight;
var TWO_PI = 2 * Math.PI;

var heat = 0;
var op = 1;

var dx = 50;
var dy = 50;

var increase = false;
var decrease = false;

var disc = {
  x: canvas.width / 2,
  y: canvas.height / 2,
  radius: Math.min(canvas.height, canvas.width) / 4,
};

var degrees = [];
var plus = document.getElementById("plus");
var minus = document.getElementById("minus");

for(i = 0; i < ((canvas.width/dx)*(canvas.height/dy)); i++){
  degrees.push((0.5-Math.random())*TWO_PI);
}

var heat_button = document.getElementById("heat_button");
heat_button.addEventListener('click', toggle_heat);

var reset_button = document.getElementById("reset_button");
reset_button.addEventListener('click', reset_heat);

function reset_heat(){
  heat = 0;
  increase = false;
  decrease = false;
}

function swap_button_label(){
  if (heat_button.getAttribute("data-text-swap") == heat_button.innerHTML) {
    heat_button.innerHTML = heat_button.getAttribute("data-text-original");
    increase = false;
    decrease = true;
  } else {
    heat_button.setAttribute("data-text-original", heat_button.innerHTML);
    heat_button.innerHTML = heat_button.getAttribute("data-text-swap");
    increase = true;
    decrease = false;
  }
}
function toggle_heat(){
  swap_button_label();
}


var ellipse_width = dx/4;
var ellipse_height = dy/4;

var offset_start = Math.PI/2;
var offset_end = 1.5*Math.PI;

function setButtonPosition(){
  if(canvas.width < canvas.height){
    document.getElementById("heat_button").className = "v_heat_button";
    document.getElementById("reset_button").className = "v_reset_button";
  }else{
    document.getElementById("heat_button").className = "h_heat_button";
    document.getElementById("reset_button").className = "h_reset_button";
  }
}

window.addEventListener("deviceorientation", setButtonPosition, true);

window.addEventListener( 'resize', setButtonPosition, true);                   

function draw() {
  ctx.fillStyle = "#000";
  if (decrease && (heat > -250)) {
    heat -= 5;
  }
  if (increase && (heat < 250)) {
    heat += 5;
  }

  if(mobile){
    canvas.width = initialW;
    canvas.height = initialH;
  }else{
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
  }
  
  disc.x = canvas.width / 2;
  disc.y = canvas.height / 2;
  ctx.strokeStyle = "rgb(0,0,0)";

  ratio = heat/250;

  for (i = 0; i < canvas.width/dx; i++) {
    for (j = 0; j < canvas.height/dy; j++) {

      theta = degrees[(j*Math.round(canvas.width/dx) + i)%degrees.length];

      target_x = -ratio*(i*dx+dx/2 - disc.x);
      target_y = -ratio*(j*dy+dy/2 - disc.y);

      target = Math.atan2(target_x, target_y);

      theta = (1-Math.abs(ratio)) * theta + Math.abs(ratio) * target;

      var centre_x = i*dx+dx/2;
      var centre_y = j*dy+dy/1.5;

      //DRAW LINES
      ctx.lineWidth = 2;
      ctx.beginPath();
      ctx.moveTo(centre_x - (ellipse_width * Math.cos(theta+offset_start)), centre_y + (ellipse_height * Math.sin(theta+offset_start)));

      ctx.lineTo(centre_x - (ellipse_width * Math.cos(theta+offset_end)), centre_y + (ellipse_height * Math.sin(theta+offset_end)));
      ctx.stroke();

      //DRAW ARROW HEADS
      ctx.lineWidth = 1;
      ctx.beginPath();
      ctx.moveTo(centre_x - ((ellipse_width+5) * Math.cos(theta+offset_end)), centre_y + ((ellipse_height+5) * Math.sin(theta+offset_end)));
      ctx.lineTo(centre_x - (ellipse_width/2 * Math.cos(theta+offset_end-0.8)), centre_y + (ellipse_height/2 * Math.sin(theta+offset_end-0.8)));
      ctx.lineTo(centre_x - (ellipse_width/2 * Math.cos(theta+offset_end+0.8)), centre_y + (ellipse_height/2 * Math.sin(theta+offset_end+0.8)));
      ctx.fill();
    }
  }
  ctx.strokeStyle = "rgba(250,250,0,"+(heat/250)+")";
  ctx.lineWidth = 2;

  var grd=ctx.createRadialGradient(disc.x,disc.y,disc.radius/10,disc.x,disc.y,disc.radius);

  var blue;
  var green;
  var green_2;
  if(heat > 0){
    blue = 0;
    green = Math.max(heat-50,0);
  }else{
    blue = -heat;
    green = -heat;
  }
  grd.addColorStop(0,"rgba(" + heat + ","+ green +","+blue+","+Math.abs(heat/250)+")");
  grd.addColorStop(1,"rgba(" + heat + ",0,"+blue+","+Math.abs(heat/250)+")");


  ctx.beginPath();
  ctx.arc(disc.x, disc.y, disc.radius, 0, TWO_PI);
  ctx.fill();

  ctx.fillStyle = grd;

  ctx.beginPath();
  ctx.arc(disc.x, disc.y, disc.radius, 0, TWO_PI);
  ctx.stroke();
  ctx.beginPath();
  ctx.arc(disc.x, disc.y, disc.radius, 0, TWO_PI);
  ctx.fill();
  /*
  ctx.fillStyle = "rgba(255,255,255,"+Math.abs(heat/250)+")";
  ctx.fillRect(Math.floor(disc.x-dx/2), Math.floor(disc.y-dy/10),Math.floor(dx/2),Math.floor(dy/5));
  ctx.fillRect(Math.floor(disc.x), Math.floor(disc.y-dy/10),Math.floor(dx/2),Math.floor(dy/5));
  ctx.fillRect(Math.floor(disc.x-dx/10), Math.floor(disc.y-dy/2), Math.floor(dx/5), Math.floor(dy/2.5));
  ctx.fillRect(Math.floor(disc.x-dx/10), Math.floor(disc.y+dy/10), Math.floor(dx/5), Math.floor(dy/2.5));
  */
  ctx.save();
  ctx.globalAlpha = Math.abs(heat/250);
  if(heat < 0){
    ctx.drawImage(plus, disc.x-dx, disc.y-dy, 2*dx, 2*dy);
  }else{
    ctx.drawImage(minus, disc.x-dx, disc.y-dy, 2*dx, 2*dy);
  }
  ctx.restore();
  window.requestAnimationFrame(draw);
}

window.requestAnimationFrame(draw);
            
          
!
999px
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