blobular droplets!!

_.md

[ Launch: blobular droplets!! ] 90bed79b74aaa9b97c1a by enjalot

config.json

{"editor_editor":{"coffee":false,"vim":true,"emacs":false,"width":528,"height":680,"hide":false},"description":"blobular droplets!!","endpoint":"","display":"svg","public":true,"require":[],"fileconfigs":{"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12},"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"style.css":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"fullscreen":false,"play":true,"loop":true,"restart":false,"autoinit":true,"pause":true,"loop_type":"pingpong","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01,"thumbnail":"http://i.imgur.com/PcrQGNa.gif","ajax-caching":true}

inlet.js

//trying to recreate the effect from here:
//www.themaninblue.com/experiment/Blobular/


var A = { x: tributary.sw/2, y: tributary.sh/2, r: 76, index: -1 };

var data = [A];

for(var i = 0; i < 10; i++ ) {
  data.push({
    x1: tributary.sw * Math.random(),
    y1: tributary.sh * Math.random(),
    x2: tributary.sw * Math.random(),
    y2: tributary.sh * Math.random(), 
    r: 33,
    index: i
  });
}

var join = { r: 163 };
//"period", "pingpong"
tributary.__config__.set("loop_type", "pingpong")

var color = "#00ea00";
var circleColor = "#1470ad";
var strokeWidth = 20;

function renderGoo(a,b,add) {
  var originDistance = a.r - b.r;  
    
  var distance = calculateDistance(a,b);
  var distanceDiff = distance - originDistance;
  if(distanceDiff < 1) { distanceDiff = 1 }
  
  var angle = calculateAngle(a,b);
  b.h = 0;
  b.k = 0 - a.r + b.r - distanceDiff;

  var triangleA = a.r + join.r; // Side a
  var triangleB = b.r + join.r; // Side b
  var triangleC = Math.abs(b.k); // Side c
  var triangleP = (triangleA + triangleB + triangleC) / 2; // Triangle half perimeter
  var triangleArea = Math.sqrt(triangleP * (triangleP - triangleA) * (triangleP - triangleB) * (triangleP - triangleC)); // Triangle area
  if (triangleC >= triangleA)
  {
    var triangleH = 2 * triangleArea / triangleC; // Triangle height
    var triangleD = Math.sqrt(Math.pow(triangleA, 2) - Math.pow(triangleH, 2)); // Big circle bisection of triangleC
  }
  else
  {
    var triangleH = 2 * triangleArea / triangleA; // Triangle height
    var triangleD = Math.sqrt(Math.pow(triangleC, 2) - Math.pow(triangleH, 2)); // Small circle bisection of triangleA
  }
  
  a.tan = triangleH / triangleD; 
  a.angle = Math.atan(a.tan); 
  a.sin = Math.sin(a.angle);
  a.intersectX = a.sin * a.r;
  a.cos = Math.cos(a.angle);
  a.intersectY = a.cos * a.r;

  join.x = 0 + a.sin * (a.r + join.r);
  join.y = 0 - a.cos * (a.r + join.r);

  var coord1 = { x: -a.intersectX, y: -a.intersectY };
  var coord2 = { x: a.intersectX, y: -a.intersectY }
  b.tan = (b.k - join.y) / (b.h - join.x);
  b.angle = Math.atan(b.tan);
  b.intersectX = join.x - Math.cos(b.angle) * (join.r);
  b.intersectY = join.y - Math.sin(b.angle) * (join.r);    
  
  var lavaPathD = "M " + coord1.x + " " + coord1.y + " A " + a.r + " " + a.r + " 0 1 0 " + coord2.x + " " + coord2.y;
  if (join.x - join.r <= 0 && b.k < join.y)
  {
    var crossOverY = circleYFromX(join, 0);
   
    lavaPathD += "A " + join.r + " " + join.r + " 0 0 1 0 " + (join.y + crossOverY);
    lavaPathD += "m 0 -" + (crossOverY * 2);
  }
   lavaPathD += "A " + join.r + " " + join.r + " 0 0 1 " + b.intersectX + " " + b.intersectY;
  var largeArcFlag = 1;
    
  if (join.y < b.k)
  {
    largeArcFlag = 0;
  }

  lavaPathD += "a " + b.r + " " + b.r + " 0 " + largeArcFlag + " 0 " + (b.intersectX * -2) + " 0";
  if (join.x - join.r <= 0 && b.k < join.y)
  {
    lavaPathD += "A " + join.r + " " + join.r + " 0 0 1 0 " + (join.y - crossOverY);
    lavaPathD += "m 0 " + (crossOverY * 2);
  } 


  lavaPathD += "A " + join.r + " " + join.r + " 0 0 1 " + coord1.x + " " + coord1.y;
  lavaPathD += "A " + join.r + " " + join.r + " 0 0 1 " + coord1.x + " " + coord1.y;
  
  var dontdraw = false;
  if(distance > 2*join.r + a.r + b.r) {
    dontdraw = true;
  }
   
  if(add) {
    var lavaPath = svg.append("path")
      .classed("lava", true)
      .datum(b)
      .attr("transform", function(d) {
        var translate = "translate(" + [a.x, a.y] + ")";
        var rotate = "rotate(" + [angle, 0, 0] + ")";
        return translate + rotate;
      })
      .style("fill", color)
      .style("stroke", color)
      .style("stroke-linecap", "round")
      .style("stroke-width", strokeWidth)
    .style("display", function(d) { if(d === a) return "none" })

      lavaPath.attr("d", lavaPathD)
  } else {
  
  var lava = svg.selectAll("path.lava")
   	.data(data, function(d) {return d.index === b.index })
    .attr("transform", function(d) {
      var translate = "translate(" + [a.x, a.y] + ")";
      var rotate = "rotate(" + [angle, 0, 0] + ")";
      return translate + rotate;
    })
  if(lavaPathD.indexOf("NaN") < 0)
   	lava.attr("d", lavaPathD);
    

      lava.style("display", dontdraw ? "none" : "") 
    
  }

}



var svg = d3.select("svg");

for(var i = 0; i < data.length; i++) {
  renderGoo(A, data[i], true);
}


var drag = d3.behavior.drag()
  .on("drag", function(d) {
    var evt = d3.event;
    d.x += evt.dx;
    d.y += evt.dy;
    d3.select(this)
      .attr("cx", function(d) { return d.x })
      .attr("cy", function(d) {return d.y })
      
    for(var i = 1; i < data.length; i++) {
      renderGoo(A, data[i]);
    }
  })

svg.selectAll("circle.blob")
  .data(data)
  .enter()
  .append("circle")
  .classed("blob", true)
  .call(drag)
  .attr("cx", function(d) { return d.x })
  .attr("cy", function(d) {return d.y })
  .attr("r", function(d) { return d.r })
  .style("fill", function(d,i) { return circleColor; }) 
  .style("stroke", color)
  .style("stroke-width", strokeWidth/2)


tributary.run = function(g,t) {
  //console.log(t);
  for(var i = 1; i < data.length; i++) {
    b = data[i];
    b.x = d3.interpolate(b.x1, b.x2)(t)
    b.y = d3.interpolate(b.y1, b.y2)(t)
    renderGoo(A, b);
    d3.selectAll("circle.blob")
      .attr("cx", function(d) { return d.x })
    .attr("cy", function(d) {return d.y })
  }
}



function calculateDistance(origin, point) {
  var xx = point.x - origin.x;
  var yy = point.y - origin.y;
  return Math.sqrt(xx*xx + yy*yy)
}

function calculateAngle(origin, point)
{
	var tan = (point.y - origin.y) / (point.x - origin.x);
	var angle = Math.atan(tan) / Math.PI * 180 + 90;

	if (point.x < origin.x)
	{
		angle += 180;
	}
	
	return angle;
}

function circleYFromX (circle, x)
{
	return Math.sqrt(Math.pow(circle.r, 2) - Math.pow(x - circle.x, 2));
};

style.css

#display {
  background-color: #0074bc;
}