Tributary inlet

_.md

[ Launch: Tributary inlet ] 6049387 by pere

config.json

{"description":"Tributary inlet","endpoint":"","display":"svg","public":true,"require":[],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"fullscreen":false,"play":false,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"period","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01}

inlet.js

var width = 238,
    height = 123,
    radius = 20;

var drag = d3.behavior.drag()
    .origin(Object)
    .on("drag", dragmove);

var svg = d3.select("body").selectAll("svg")
    .data(d3.range(1).map(function() { 
      console.warn(d)
      return {x: width / 2, y: height / 2}; }))
  .enter().append("svg")
    .attr("width", width)
    .attr("height", height);

svg.append("circle")
    .attr("r", radius)
    .attr("cx", function(d) { return d.x; })
    .attr("cy", function(d) { return d.y; })
    .call(drag);

function dragmove(d) {
  d3.select(this)
      .attr("cx", d.x = Math.max(radius, Math.min(width - radius, d3.event.x)))
      .attr("cy", d.y = Math.max(radius, Math.min(height - radius, d3.event.y)));
}