saveable graph layout

_.md

[ Launch: saveable graph layout ] 5607549 by nachocab
[ Launch: savable graph layout ] 4617766 by enjalot

config.json

{"description":"saveable graph layout","endpoint":"","display":"svg","public":true,"require":[],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"graph.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}

graph.json

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inlet.js

//adapted from mike bostock's example:
//http://bl.ocks.org/4566102
//focused on saving the results of dragging


var cm = tributary.getCodeEditor("graph.json");
var graph = JSON.parse(cm.getValue());


var width = tributary.sw;
var height = tributary.sh;
var shiftKey;

var svg = d3.select("svg")
  

var link = svg.append("g")
  .attr("class", "link")
  .selectAll("line");
 
var brush = svg.append("g")
    .datum(function() { return {selected: false, previouslySelected: false}; })
    .attr("class", "brush");
 
var node = svg.append("g")
    .attr("class", "node")
  .selectAll("circle");

var linkIndices = _.map(graph.links, function(d) {
  return {target: d.target, source: d.source};
})
graph.links.forEach(function(d) {
  d.source = graph.nodes[d.source];
  d.target = graph.nodes[d.target];
});

link = link.data(graph.links).enter().append("line")
    .attr("x1", function(d) { return d.source.x; })
    .attr("y1", function(d) { return d.source.y; })
    .attr("x2", function(d) { return d.target.x; })
    .attr("y2", function(d) { return d.target.y; });

brush.call(d3.svg.brush()
      .x(d3.scale.identity().domain([0, width]))
      .y(d3.scale.identity().domain([0, height]))
      .on("brushstart", function(d) {
        node.each(function(d) { d.previouslySelected = shiftKey && d.selected; });
      })
      .on("brush", function() {
        var extent = d3.event.target.extent();
        node.classed("selected", function(d) {
          return d.selected = d.previouslySelected ^
              (extent[0][0] <= d.x && d.x < extent[1][0]
              && extent[0][1] <= d.y && d.y < extent[1][1]);
        });
      })
      .on("brushend", function() {
        d3.event.target.clear();
        d3.select(this).call(d3.event.target);
      }));

node = node.data(graph.nodes).enter().append("circle")
    .attr("r", 4)
    .attr("cx", function(d) { return d.x; })
    .attr("cy", function(d) { return d.y; })
    .on("mousedown", function(d) {
      if (!d.selected) { // Don't deselect on shift-drag.
        if (!shiftKey) node.classed("selected", function(p) { return p.selected = d === p; });
        else d3.select(this).classed("selected", d.selected = true);
      }
    })
    .on("mouseup", function(d) {
      if (d.selected && shiftKey) d3.select(this).classed("selected", d.selected = false);
    })
    .call(d3.behavior.drag()
      .on("drag", function(d) { nudge(d3.event.dx, d3.event.dy); })
      .on("dragend", function(d) {
        save();
      })
    );

function nudge(dx, dy) {
  node.filter(function(d) { return d.selected; })
      .attr("cx", function(d) { return d.x += dx; })
      .attr("cy", function(d) { return d.y += dy; })
 
  link.filter(function(d) { return d.source.selected; })
      .attr("x1", function(d) { return d.source.x; })
      .attr("y1", function(d) { return d.source.y; });
 
  link.filter(function(d) { return d.target.selected; })
      .attr("x2", function(d) { return d.target.x; })
      .attr("y2", function(d) { return d.target.y; });

  //d3.event.preventDefault();
}

function save() {
  //remove extraneous attributes from graph before saving;
  var nodes = _.map(graph.nodes, function(d) {
    return {x: d.x, y: d.y };
  })
  var links = _.map(graph.links, function(d) {
    return {source: {x: d.source.x, y: d.source.y },
            target: {x: d.target.x, y: d.target.y }
           };
  })
  var out = {"nodes":nodes, "links":linkIndices};
  //set the value of the json again, which saves it
  cm.setValue(JSON.stringify(out))
}

style.css

.node {
  stroke: #fff;
  stroke-width: 1.5px;
}
 
.node .selected {
  stroke: red;
}
 
.link {
  stroke: #999;
}
 
.brush .extent {
  fill-opacity: .1;
  stroke: #fff;
  shape-rendering: crispEdges;
}