Parallel Sets

Readme.md

Parallel sets

Base code (WIP) for a proof of concept of a parallel set with progressive disclosure (drilling down a fixed hierarchy in a flow).

Reusing code (data transformation and alluvial graph) from the Raw project, github here.

Dataset from the Parallel Sets project

alluvial.js

var alluvial = (function(){

	var width = 1000;
	var height = 500;

	var nodeWidth = 5;

	var draw = function (selection, data) {

		var formatNumber = d3.format(",.0f"),
		    format = function(d) { return formatNumber(d); };

		var g = selection
		    .attr("width", width )
		    .attr("height", height + 20 )
		  	.append("g")
		    .attr("transform", "translate(" + 0 + "," + 10 + ")");

		// Calculating the best nodePadding

		var nested = d3.nest()
	    	.key(function (d){ return d.group; })
	    	.rollup(function (d){ return d.length; })
	    	.entries(data.nodes)

	    var maxNodes = d3.max(nested, function (d){ return d.values; });

		var sankey = d3.sankey()
		    .nodeWidth(nodeWidth)
		    .nodePadding(d3.min([10,(height-maxNodes)/maxNodes]))
		    .size([width, height]);

		var path = sankey.link(),
			nodes = data.nodes,
			links = data.links;

		sankey
	   		.nodes(nodes)
	    	.links(links)
	    	.layout(32);

	    // Re-sorting nodes

	    nested = d3.nest()
	    	.key(function(d){ return d.group; })
	    	.map(nodes)

	    d3.values(nested)
	    	.forEach(function (d){
		    	var y = ( height - d3.sum(d,function(n){ return n.dy+sankey.nodePadding();}) ) / 2 + sankey.nodePadding()/2;
		    	d.sort(function (a,b){
                    return b.y - a.y;
		    		/*if (sortBy() == "automatic") return b.y - a.y;
		    		if (sortBy() == "size") return b.dy - a.dy;
                    if (sortBy() == "name") return a.name < b.name ? -1 : a.name > b.name ? 1 : 0;
                    */
		    	})
		    	d.forEach(function (node){
		    		node.y = y;
		    		y += node.dy +sankey.nodePadding();
		    	})
		    })

	    // Resorting links

		d3.values(nested).forEach(function (d){

			d.forEach(function (node){

	    		var ly = 0;
	    		node.sourceLinks
		    		.sort(function (a,b){
		    			return a.target.y - b.target.y;
		    		})
		    		.forEach(function (link){
		    			link.sy = ly;
		    			ly += link.dy;
		    		})

		    	ly = 0;

		    	node.targetLinks
		    		.sort(function(a,b){
		    			return a.source.y - b.source.y;
		    		})
		    		.forEach(function (link){
		    			link.ty = ly;
		    			ly += link.dy;
		    		})
			})
		})

		var link = g.append("g").selectAll(".link")
	    	.data(links)
	   		.enter().append("path")
			    .attr("class", "link")
			    .attr("d", path )
			    .style("stroke-width", function(d) { return Math.max(1, d.dy); })
			    .style("fill","none")
			    .style("stroke", "#333")
			    .style("stroke-opacity",".4")
			    .sort(function(a, b) { return b.dy - a.dy; })
			    .append("title")
			    .text(function(d) { console.log(d); return d.value});

		var node = g.append("g").selectAll(".node")
	    	.data(nodes)
	    	.enter().append("g")
		      	.attr("class", "node")
		      	.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })

		node.append("rect")
		    .attr("height", function(d) { return d.dy; })
		    .attr("width", sankey.nodeWidth())
		    .style("fill", "#666")
		    .append("title")
		    	.text(function(d) { return d.name + "\n" + format(d.value); });

		node.append("text")
		    .attr("x", -6)
	      	.attr("y", function (d) { return d.dy / 2; })
	      	.attr("dy", ".35em")
	      	.attr("text-anchor", "end")
	      	.attr("transform", null)
			    .text(function(d) { return d.name; })
			    .style("font-size","11px")
				.style("font-family","Arial, Helvetica")
			    .style("pointer-events","none")
			    .filter(function(d) { return d.x < width / 2; })
			    .attr("x", 6 + sankey.nodeWidth())
		     	.attr("text-anchor", "start");

	};

    return {
        draw : draw
    }    
})();

code.js

d3.csv('titanic_dataset.csv', function(data) {
    alluvial.draw(
        d3.select('svg'),
        dataToGraph(data)
    );
})

var dataToGraph = function(data) {
    var d = { nodes: [], links: [] }

    var steps = _.keys(_.first(data));

    if ( steps < 2) return d;

    var n = [], l = [], si, ti;

    for (var i=0; i < steps.length-1; i++ ) {

    var sg = steps[i]
    var tg = steps[i+1]
    var relations = d3.nest()
        .key(function (d) { return d[sg] } )
        .key(function (d) { return d[tg] } )
        .entries(data)

    relations.forEach(function (s){
        si = getNodeIndex(n, s.key, sg);

        if ( si == -1) {
        n.push({ name : s.key, group : sg })
        si = n.length-1;
        }

        s.values.forEach(function (t){
        ti = getNodeIndex(n, t.key, tg)
        if (ti == -1) {
            n.push({ name : t.key, group : tg })
            ti = n.length-1;
        }
        var value = t.values.length;
        var link = { source : n[si], target : n[ti], value : value };
        l.push(link);
        })

    })
    }
    d.nodes = n.sort(customSort);
    l.forEach(function (d){ d.source = n.indexOf(d.source); d.target = n.indexOf(d.target)});
    d.links = l;
    return d;
}

function customSort(a, b) {
    var Item1 = a.group;
    var Item2 = b.group;
    if(Item1 != Item2)
        return (Item1.localeCompare(Item2));
    else 
        return (a.name.localeCompare(b.name));
}


function getNodeIndex(array, name, group) {
    for (var i in array) {
        var a = array[i]
        if (a['name'] == name && a['group'] == group) {
            return i;
        }
    }
    return -1;
}

d3.v3.min.js

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lodash.min.js

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sankey.js

d3.sankey = function() {
  var sankey = {},
      nodeWidth = 24,
      nodePadding = 8,
      size = [1, 1],
      nodes = [],
      links = [];

  sankey.nodeWidth = function(_) {
    if (!arguments.length) return nodeWidth;
    nodeWidth = +_;
    return sankey;
  };

  sankey.nodePadding = function(_) {
    if (!arguments.length) return nodePadding;
    nodePadding = +_;
    return sankey;
  };

  sankey.nodes = function(_) {
    if (!arguments.length) return nodes;
    nodes = _;
    return sankey;
  };

  sankey.links = function(_) {
    if (!arguments.length) return links;
    links = _;
    return sankey;
  };

  sankey.size = function(_) {
    if (!arguments.length) return size;
    size = _;
    return sankey;
  };

  sankey.layout = function(iterations) {
    computeNodeLinks();
    computeNodeValues();
    computeNodeBreadths();
    computeNodeDepths(iterations);
    computeLinkDepths();
    return sankey;
  };

  sankey.relayout = function() {
    computeLinkDepths();
    return sankey;
  };

  sankey.link = function() {
    var curvature = .5;

    function link(d) {
      var x0 = d.source.x + d.source.dx,
          x1 = d.target.x,
          xi = d3.interpolateNumber(x0, x1),
          x2 = xi(curvature),
          x3 = xi(1 - curvature),
          y0 = d.source.y + d.sy + d.dy / 2,
          y1 = d.target.y + d.ty + d.dy / 2;
      return "M" + x0 + "," + y0
           + "C" + x2 + "," + y0
           + " " + x3 + "," + y1
           + " " + x1 + "," + y1;
    }

    link.curvature = function(_) {
      if (!arguments.length) return curvature;
      curvature = +_;
      return link;
    };

    return link;
  };

  // Populate the sourceLinks and targetLinks for each node.
  // Also, if the source and target are not objects, assume they are indices.
  function computeNodeLinks() {
    nodes.forEach(function(node) {
      node.sourceLinks = [];
      node.targetLinks = [];
    });
    links.forEach(function(link) {
      var source = link.source,
          target = link.target;
      if (typeof source === "number") source = link.source = nodes[link.source];
      if (typeof target === "number") target = link.target = nodes[link.target];
      source.sourceLinks.push(link);
      target.targetLinks.push(link);
    });
  }

  // Compute the value (size) of each node by summing the associated links.
  function computeNodeValues() {
    nodes.forEach(function(node) {
      node.value = Math.max(
        d3.sum(node.sourceLinks, value),
        d3.sum(node.targetLinks, value)
      );
    });
  }

  // Iteratively assign the breadth (x-position) for each node.
  // Nodes are assigned the maximum breadth of incoming neighbors plus one;
  // nodes with no incoming links are assigned breadth zero, while
  // nodes with no outgoing links are assigned the maximum breadth.
  function computeNodeBreadths() {
    var remainingNodes = nodes,
        nextNodes,
        x = 0;

    while (remainingNodes.length) {
      nextNodes = [];
      remainingNodes.forEach(function(node) {
        node.x = x;
        node.dx = nodeWidth;
        node.sourceLinks.forEach(function(link) {
          if (nextNodes.indexOf(link.target) < 0) {
            nextNodes.push(link.target);
          }
        });
      });
      remainingNodes = nextNodes;
      ++x;
    }

    //
    moveSinksRight(x);
    scaleNodeBreadths((size[0] - nodeWidth) / (x - 1));
  }

  function moveSourcesRight() {
    nodes.forEach(function(node) {
      if (!node.targetLinks.length) {
        node.x = d3.min(node.sourceLinks, function(d) { return d.target.x; }) - 1;
      }
    });
  }

  function moveSinksRight(x) {
    nodes.forEach(function(node) {
      if (!node.sourceLinks.length) {
        node.x = x - 1;
      }
    });
  }

  function scaleNodeBreadths(kx) {
    nodes.forEach(function(node) {
      node.x *= kx;
    });
  }

  function computeNodeDepths(iterations) {
    var nodesByBreadth = d3.nest()
        .key(function(d) { return d.x; })
        .sortKeys(d3.ascending)
        .entries(nodes)
        .map(function(d) { return d.values; });

    //
    initializeNodeDepth();
    resolveCollisions();
    for (var alpha = 1; iterations > 0; --iterations) {
      relaxRightToLeft(alpha *= .99);
      resolveCollisions();
      relaxLeftToRight(alpha);
      resolveCollisions();
    }

    function initializeNodeDepth() {
      var ky = d3.min(nodesByBreadth, function(nodes) {
        return (size[1] - (nodes.length - 1) * nodePadding) / d3.sum(nodes, value);
      });

      nodesByBreadth.forEach(function(nodes) {
        nodes.forEach(function(node, i) {
          node.y = i;
          node.dy = node.value * ky;
        });
      });

      links.forEach(function(link) {
        link.dy = link.value * ky;
      });
    }

    function relaxLeftToRight(alpha) {
      nodesByBreadth.forEach(function(nodes, breadth) {
        nodes.forEach(function(node) {
          if (node.targetLinks.length) {
            var y = d3.sum(node.targetLinks, weightedSource) / d3.sum(node.targetLinks, value);
            node.y += (y - center(node)) * alpha;
          }
        });
      });

      function weightedSource(link) {
        return center(link.source) * link.value;
      }
    }

    function relaxRightToLeft(alpha) {
      nodesByBreadth.slice().reverse().forEach(function(nodes) {
        nodes.forEach(function(node) {
          if (node.sourceLinks.length) {
            var y = d3.sum(node.sourceLinks, weightedTarget) / d3.sum(node.sourceLinks, value);
            node.y += (y - center(node)) * alpha;
          }
        });
      });

      function weightedTarget(link) {
        return center(link.target) * link.value;
      }
    }

    function resolveCollisions() {
      nodesByBreadth.forEach(function(nodes) {
        var node,
            dy,
            y0 = 0,
            n = nodes.length,
            i;

        // Push any overlapping nodes down.
        nodes.sort(ascendingDepth);
        for (i = 0; i < n; ++i) {
          node = nodes[i];
          dy = y0 - node.y;
          if (dy > 0) node.y += dy;
          y0 = node.y + node.dy + nodePadding;
        }

        // If the bottommost node goes outside the bounds, push it back up.
        dy = y0 - nodePadding - size[1];
        if (dy > 0) {
          y0 = node.y -= dy;

          // Push any overlapping nodes back up.
          for (i = n - 2; i >= 0; --i) {
            node = nodes[i];
            dy = node.y + node.dy + nodePadding - y0;
            if (dy > 0) node.y -= dy;
            y0 = node.y;
          }
        }
      });
    }

    function ascendingDepth(a, b) {
      return a.y - b.y;
    }
  }

  function computeLinkDepths() {
    nodes.forEach(function(node) {
      node.sourceLinks.sort(ascendingTargetDepth);
      node.targetLinks.sort(ascendingSourceDepth);
    });
    nodes.forEach(function(node) {
      var sy = 0, ty = 0;
      node.sourceLinks.forEach(function(link) {
        link.sy = sy;
        sy += link.dy;
      });
      node.targetLinks.forEach(function(link) {
        link.ty = ty;
        ty += link.dy;
      });
    });

    function ascendingSourceDepth(a, b) {
      return a.source.y - b.source.y;
    }

    function ascendingTargetDepth(a, b) {
      return a.target.y - b.target.y;
    }
  }

  function center(node) {
    return node.y + node.dy / 2;
  }

  function value(link) {
    return link.value;
  }

  return sankey;
};

thumbnail.png

titanic_dataset.csv