dwtkns/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Building on this - experimenting with fake 3d svg arcs using two nested orthographic projections and cardinal line interpolation.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

.land {
  fill: #999;
  stroke-opacity: 1;
}

.graticule {
  fill: none;
  stroke: black;
  stroke-width:.5;
  opacity:.2;
}

.labels {
    font: 8px sans-serif;
    fill: black;
    opacity: .5;

    display:none;
}

.noclicks { pointer-events:none; }

.point {  opacity:.6; }

.arcs {
  opacity:.1;
  stroke: gray;
  stroke-width: 3;
}
.flyers {
  stroke-width:1;
  opacity: .6;
  stroke: darkred;
}
.arc, .flyer {
  stroke-linejoin: round;
  fill:none;
}
  .arc { }
  .flyer { }
  .flyer:hover { }

</style>

<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/queue.v1.min.js"></script>
<script src="http://d3js.org/topojson.v0.min.js"></script>
<script>

d3.select(window)
    .on("mousemove", mousemove)
    .on("mouseup", mouseup);

var width = 960,
    height = 500;

var proj = d3.geo.orthographic()
    .translate([width / 2, height / 2])
    .clipAngle(90)
    .scale(220);

var sky = d3.geo.orthographic()
    .translate([width / 2, height / 2])
    .clipAngle(90)
    .scale(300);

var path = d3.geo.path().projection(proj).pointRadius(2);

var swoosh = d3.svg.line()
      .x(function(d) { return d[0] })
      .y(function(d) { return d[1] })
      .interpolate("cardinal")
      .tension(.0);

var links = [],
    arcLines = [];

var svg = d3.select("body").append("svg")
            .attr("width", width)
            .attr("height", height)
            .on("mousedown", mousedown);

queue()
    .defer(d3.json, "/d/4686432/world-110m.json")
    .defer(d3.json, "places.json")
    .await(ready);

function ready(error, world, places) {
  var ocean_fill = svg.append("defs").append("radialGradient")
        .attr("id", "ocean_fill")
        .attr("cx", "75%")
        .attr("cy", "25%");
      ocean_fill.append("stop").attr("offset", "5%").attr("stop-color", "#fff");
      ocean_fill.append("stop").attr("offset", "100%").attr("stop-color", "#ababab");

  var globe_highlight = svg.append("defs").append("radialGradient")
        .attr("id", "globe_highlight")
        .attr("cx", "75%")
        .attr("cy", "25%");
      globe_highlight.append("stop")
        .attr("offset", "5%").attr("stop-color", "#ffd")
        .attr("stop-opacity","0.6");
      globe_highlight.append("stop")
        .attr("offset", "100%").attr("stop-color", "#ba9")
        .attr("stop-opacity","0.2");

  var globe_shading = svg.append("defs").append("radialGradient")
        .attr("id", "globe_shading")
        .attr("cx", "55%")
        .attr("cy", "45%");
      globe_shading.append("stop")
        .attr("offset","30%").attr("stop-color", "#fff")
        .attr("stop-opacity","0")
      globe_shading.append("stop")
        .attr("offset","100%").attr("stop-color", "#505962")
        .attr("stop-opacity","0.3")

  var drop_shadow = svg.append("defs").append("radialGradient")
        .attr("id", "drop_shadow")
        .attr("cx", "50%")
        .attr("cy", "50%");
      drop_shadow.append("stop")
        .attr("offset","20%").attr("stop-color", "#000")
        .attr("stop-opacity",".5")
      drop_shadow.append("stop")
        .attr("offset","100%").attr("stop-color", "#000")
        .attr("stop-opacity","0")

  svg.append("ellipse")
    .attr("cx", 440).attr("cy", 450)
    .attr("rx", proj.scale()*.90)
    .attr("ry", proj.scale()*.25)
    .attr("class", "noclicks")
    .style("fill", "url(#drop_shadow)");

  svg.append("circle")
    .attr("cx", width / 2).attr("cy", height / 2)
    .attr("r", proj.scale())
    .attr("class", "noclicks")
    .style("fill", "url(#ocean_fill)");

  svg.append("path")
    .datum(topojson.object(world, world.objects.land))
    .attr("class", "land noclicks")
    .attr("d", path);

  svg.append("circle")
    .attr("cx", width / 2).attr("cy", height / 2)
    .attr("r", proj.scale())
    .attr("class","noclicks")
    .style("fill", "url(#globe_highlight)");

  svg.append("circle")
    .attr("cx", width / 2).attr("cy", height / 2)
    .attr("r", proj.scale())
    .attr("class","noclicks")
    .style("fill", "url(#globe_shading)");

  svg.append("g").attr("class","points")
      .selectAll("text").data(places.features)
    .enter().append("path")
      .attr("class", "point")
      .attr("d", path);

  // spawn links between cities as source/target coord pairs
  places.features.forEach(function(a) {
    places.features.forEach(function(b) {
      if (a !== b) {
        links.push({
          source: a.geometry.coordinates,
          target: b.geometry.coordinates
        });
      }
    });
  });

  // build geoJSON features from links array
  links.forEach(function(e,i,a) {
    var feature =   { "type": "Feature", "geometry": { "type": "LineString", "coordinates": [e.source,e.target] }}
    arcLines.push(feature)
  })

  svg.append("g").attr("class","arcs")
    .selectAll("path").data(arcLines)
    .enter().append("path")
      .attr("class","arc")
      .attr("d",path)

  svg.append("g").attr("class","flyers")
    .selectAll("path").data(links)
    .enter().append("path")
    .attr("class","flyer")
    .attr("d", function(d) { return swoosh(flying_arc(d)) })

  refresh();
}

function flying_arc(pts) {
  var source = pts.source,
      target = pts.target;

  var mid = location_along_arc(source, target, .5);
  var result = [ proj(source),
                 sky(mid),
                 proj(target) ]
  return result;
}


function refresh() {
  svg.selectAll(".land").attr("d", path);
  svg.selectAll(".point").attr("d", path);

  svg.selectAll(".arc").attr("d", path)
    .attr("opacity", function(d) {
        return fade_at_edge(d)
    })

  svg.selectAll(".flyer")
    .attr("d", function(d) { return swoosh(flying_arc(d)) })
    .attr("opacity", function(d) {
      return fade_at_edge(d)
    })
}

function fade_at_edge(d) {
  var centerPos = proj.invert([width/2,height/2]),
      arc = d3.geo.greatArc(),
      start, end;
  // function is called on 2 different data structures..
  if (d.source) {
    start = d.source,
    end = d.target;
  }
  else {
    start = d.geometry.coordinates[0];
    end = d.geometry.coordinates[1];
  }

  var start_dist = 1.57 - arc.distance({source: start, target: centerPos}),
      end_dist = 1.57 - arc.distance({source: end, target: centerPos});

  var fade = d3.scale.linear().domain([-.1,0]).range([0,.1])
  var dist = start_dist < end_dist ? start_dist : end_dist;

  return fade(dist)
}

function location_along_arc(start, end, loc) {
  var interpolator = d3.geo.interpolate(start,end);
  return interpolator(loc)
}

// modified from http://bl.ocks.org/1392560
var m0, o0;
function mousedown() {
  m0 = [d3.event.pageX, d3.event.pageY];
  o0 = proj.rotate();
  d3.event.preventDefault();
}
function mousemove() {
  if (m0) {
    var m1 = [d3.event.pageX, d3.event.pageY]
      , o1 = [o0[0] + (m1[0] - m0[0]) / 6, o0[1] + (m0[1] - m1[1]) / 6];
    o1[1] = o1[1] > 30  ? 30  :
            o1[1] < -30 ? -30 :
            o1[1];
    proj.rotate(o1);
    sky.rotate(o1);
    refresh();
  }
}
function mouseup() {
  if (m0) {
    mousemove();
    m0 = null;
  }
}
</script>

## places.json

      
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    Raw
  

              places.json
            
          
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	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.land {
	fill: #999;
	stroke-opacity: 1;
	}

	.graticule {
	fill: none;
	stroke: black;
	stroke-width:.5;
	opacity:.2;
	}

	.labels {
	font: 8px sans-serif;
	fill: black;
	opacity: .5;

	display:none;
	}

	.noclicks { pointer-events:none; }

	.point { opacity:.6; }

	.arcs {
	opacity:.1;
	stroke: gray;
	stroke-width: 3;
	}
	.flyers {
	stroke-width:1;
	opacity: .6;
	stroke: darkred;
	}
	.arc, .flyer {
	stroke-linejoin: round;
	fill:none;
	}
	.arc { }
	.flyer { }
	.flyer:hover { }

	</style>

	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="http://d3js.org/queue.v1.min.js"></script>
	<script src="http://d3js.org/topojson.v0.min.js"></script>
	<script>

	d3.select(window)
	.on("mousemove", mousemove)
	.on("mouseup", mouseup);

	var width = 960,
	height = 500;

	var proj = d3.geo.orthographic()
	.translate([width / 2, height / 2])
	.clipAngle(90)
	.scale(220);

	var sky = d3.geo.orthographic()
	.translate([width / 2, height / 2])
	.clipAngle(90)
	.scale(300);

	var path = d3.geo.path().projection(proj).pointRadius(2);

	var swoosh = d3.svg.line()
	.x(function(d) { return d[0] })
	.y(function(d) { return d[1] })
	.interpolate("cardinal")
	.tension(.0);

	var links = [],
	arcLines = [];

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height)
	.on("mousedown", mousedown);

	queue()
	.defer(d3.json, "/d/4686432/world-110m.json")
	.defer(d3.json, "places.json")
	.await(ready);

	function ready(error, world, places) {
	var ocean_fill = svg.append("defs").append("radialGradient")
	.attr("id", "ocean_fill")
	.attr("cx", "75%")
	.attr("cy", "25%");
	ocean_fill.append("stop").attr("offset", "5%").attr("stop-color", "#fff");
	ocean_fill.append("stop").attr("offset", "100%").attr("stop-color", "#ababab");

	var globe_highlight = svg.append("defs").append("radialGradient")
	.attr("id", "globe_highlight")
	.attr("cx", "75%")
	.attr("cy", "25%");
	globe_highlight.append("stop")
	.attr("offset", "5%").attr("stop-color", "#ffd")
	.attr("stop-opacity","0.6");
	globe_highlight.append("stop")
	.attr("offset", "100%").attr("stop-color", "#ba9")
	.attr("stop-opacity","0.2");

	var globe_shading = svg.append("defs").append("radialGradient")
	.attr("id", "globe_shading")
	.attr("cx", "55%")
	.attr("cy", "45%");
	globe_shading.append("stop")
	.attr("offset","30%").attr("stop-color", "#fff")
	.attr("stop-opacity","0")
	globe_shading.append("stop")
	.attr("offset","100%").attr("stop-color", "#505962")
	.attr("stop-opacity","0.3")

	var drop_shadow = svg.append("defs").append("radialGradient")
	.attr("id", "drop_shadow")
	.attr("cx", "50%")
	.attr("cy", "50%");
	drop_shadow.append("stop")
	.attr("offset","20%").attr("stop-color", "#000")
	.attr("stop-opacity",".5")
	drop_shadow.append("stop")
	.attr("offset","100%").attr("stop-color", "#000")
	.attr("stop-opacity","0")

	svg.append("ellipse")
	.attr("cx", 440).attr("cy", 450)
	.attr("rx", proj.scale()*.90)
	.attr("ry", proj.scale()*.25)
	.attr("class", "noclicks")
	.style("fill", "url(#drop_shadow)");

	svg.append("circle")
	.attr("cx", width / 2).attr("cy", height / 2)
	.attr("r", proj.scale())
	.attr("class", "noclicks")
	.style("fill", "url(#ocean_fill)");

	svg.append("path")
	.datum(topojson.object(world, world.objects.land))
	.attr("class", "land noclicks")
	.attr("d", path);

	svg.append("circle")
	.attr("cx", width / 2).attr("cy", height / 2)
	.attr("r", proj.scale())
	.attr("class","noclicks")
	.style("fill", "url(#globe_highlight)");

	svg.append("circle")
	.attr("cx", width / 2).attr("cy", height / 2)
	.attr("r", proj.scale())
	.attr("class","noclicks")
	.style("fill", "url(#globe_shading)");

	svg.append("g").attr("class","points")
	.selectAll("text").data(places.features)
	.enter().append("path")
	.attr("class", "point")
	.attr("d", path);

	// spawn links between cities as source/target coord pairs
	places.features.forEach(function(a) {
	places.features.forEach(function(b) {
	if (a !== b) {
	links.push({
	source: a.geometry.coordinates,
	target: b.geometry.coordinates
	});
	}
	});
	});

	// build geoJSON features from links array
	links.forEach(function(e,i,a) {
	var feature = { "type": "Feature", "geometry": { "type": "LineString", "coordinates": [e.source,e.target] }}
	arcLines.push(feature)
	})

	svg.append("g").attr("class","arcs")
	.selectAll("path").data(arcLines)
	.enter().append("path")
	.attr("class","arc")
	.attr("d",path)

	svg.append("g").attr("class","flyers")
	.selectAll("path").data(links)
	.enter().append("path")
	.attr("class","flyer")
	.attr("d", function(d) { return swoosh(flying_arc(d)) })

	refresh();
	}

	function flying_arc(pts) {
	var source = pts.source,
	target = pts.target;

	var mid = location_along_arc(source, target, .5);
	var result = [ proj(source),
	sky(mid),
	proj(target) ]
	return result;
	}



	function refresh() {
	svg.selectAll(".land").attr("d", path);
	svg.selectAll(".point").attr("d", path);

	svg.selectAll(".arc").attr("d", path)
	.attr("opacity", function(d) {
	return fade_at_edge(d)
	})

	svg.selectAll(".flyer")
	.attr("d", function(d) { return swoosh(flying_arc(d)) })
	.attr("opacity", function(d) {
	return fade_at_edge(d)
	})
	}

	function fade_at_edge(d) {
	var centerPos = proj.invert([width/2,height/2]),
	arc = d3.geo.greatArc(),
	start, end;
	// function is called on 2 different data structures..
	if (d.source) {
	start = d.source,
	end = d.target;
	}
	else {
	start = d.geometry.coordinates[0];
	end = d.geometry.coordinates[1];
	}

	var start_dist = 1.57 - arc.distance({source: start, target: centerPos}),
	end_dist = 1.57 - arc.distance({source: end, target: centerPos});

	var fade = d3.scale.linear().domain([-.1,0]).range([0,.1])
	var dist = start_dist < end_dist ? start_dist : end_dist;

	return fade(dist)
	}

	function location_along_arc(start, end, loc) {
	var interpolator = d3.geo.interpolate(start,end);
	return interpolator(loc)
	}

	// modified from http://bl.ocks.org/1392560
	var m0, o0;
	function mousedown() {
	m0 = [d3.event.pageX, d3.event.pageY];
	o0 = proj.rotate();
	d3.event.preventDefault();
	}
	function mousemove() {
	if (m0) {
	var m1 = [d3.event.pageX, d3.event.pageY]
	, o1 = [o0[0] + (m1[0] - m0[0]) / 6, o0[1] + (m0[1] - m1[1]) / 6];
	o1[1] = o1[1] > 30 ? 30 :
	o1[1] < -30 ? -30 :
	o1[1];
	proj.rotate(o1);
	sky.rotate(o1);
	refresh();
	}
	}
	function mouseup() {
	if (m0) {
	mousemove();
	m0 = null;
	}
	}
	</script>