prototype: d3.geo topojson v1

_.md

[ Launch: prototype: d3.geo topojson v1 ] 15f816958d3a54e9e798 by heavysixer
[ Launch: prototype: d3.geo topojson v1 ] ea8cb87ef3c5574d38b1 by enjalot
[ Launch: Tributary inlet ] 4700486 by enjalot

config.json

{"description":"prototype: d3.geo topojson v1","endpoint":"","display":"svg","public":true,"require":[{"name":"topojson v1","url":"http://d3js.org/topojson.v1.min.js"},{"name":"topojson v1","url":"http://d3js.org/topojson.v1.min.js"},{"name":"clipper","url":"https://rawgit.com/Delapouite/JsClipper/blob/master/clipper.js"},{"name":"clipper","url":"https://rawgit.com/Delapouite/JsClipper/master/clipper.js"}],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"world110.json":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"style.css":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"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,"fullscreen":false,"thumbnail":"http://i.imgur.com/OtZ3o1y.png","ajax-caching":true}

inlet.js

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

var width = tributary.sw;
var height = tributary.sh;
var center = {
  x: width/2,
  y: height/2
}

var world = tributary.world110;
var countries = topojson.feature(world, world.objects.land);


var projection = d3.geo.orthographic()
  .scale(200)
  .rotate([9,0,0])
  .translate([width/2, height/2])
  .clipAngle(90);


var path = d3.geo.path()
  .projection(projection);


svg.append("path")
.attr("d", path(countries))
.classed("land", true);


var bbox = svg.select('.land')[0][0].getBBox();

var roundTo = function (input, sigdigs) {
  return Math.round(input * Math.pow(10, sigdigs) ) / Math.pow(10, sigdigs);
}

var makeSpiralPoints = function(origin, revolutions, pointCount, clockwise, padding){
  var direction = clockwise ? 1 : -1;
  var circ = padding / (2 * Math.PI);
  var step = (2 * Math.PI * revolutions) / pointCount;
  var points = [], angle, x, y;
  for (var i = 0; i <= pointCount ; i++){
    angle = direction * step * i;
    x = roundTo((circ * angle) * Math.cos(angle) + origin.x, 2);
    y = roundTo((circ * angle) * Math.sin(angle) + origin.y, 2);
    points.push(x + " " + y);
  }
  
  return('M ' + points.shift() + ' S ' + points.join(' '));
}

var spiral = svg.append("path")
.attr("d", makeSpiralPoints({x:center.x,y:center.y},bbox.height/8, 4000, false, 4))
.classed("spiral", true);

console.log(spiral.getTotalLength());

style.css

.land {
  fill: none;
  stroke: #000000;
}
.stroke {
  fill: none;
  stroke: #ff0000;
}

.spiral {
  fill: #ffffff;
  stroke: #CC0A48;
  fill-opacity: 0.2
}

world110.json