var svg = d3.select('#word-network-preview-' + scope.card._id)
            .append('svg')
            .attr("width", width)
            .attr("height", height);

          var zoom = d3.zoom()
            .scaleExtent([.1, 1])
            .on("zoom", zoomed);

          svg.call(zoom);

          var color = d3.scaleOrdinal(d3.schemeCategory20);

          var simulation = d3.forceSimulation()
            .force("link", d3.forceLink().id(function(d) { return d.id; }).distance(function(d) { return 100+(Math.random()*50)  ; }).strength(0.5))
            .force("charge", d3.forceManyBody().distanceMax(40))
            .force("center", d3.forceCenter(width / 2, height / 2));

          var link = svg.append("g")
            .attr("class", "links")
            .selectAll("line")
            .data(scope.graph.links)
            .enter().append("line")
              .attr("stroke", "#ddd")
              .attr("stroke-width", function(d) { return Math.sqrt(d.value); });

          var node = svg.append("g")
            .attr("class", "nodes")
            .selectAll("circle")
            .data(scope.graph.nodes)
            .enter().append("circle")
              .attr("r", function(d) { return 10; })
              .attr("fill", function(d) { return color(d.group); })
              .call(d3.drag()
                .on("start", dragstarted)
                .on("drag", dragged)
                .on("end", dragended));

          var labels = svg.append("g")
            .attr("class", "label")
            .selectAll("text")
            .data(scope.graph.nodes)
            .enter().append("text")
              .attr("dx", (function(d) { return 10; }))
              .attr("dy", ".35em")
              .text(function(d) { return d.id });

          simulation
            .nodes(scope.graph.nodes)
            .on("tick", ticked);

          // connections
          simulation.force("link")
            .links(scope.graph.links);
          // end connectons

          function ticked() {
            link
              .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; });

            node
              .attr("cx", function(d) { return d.x; })
              .attr("cy", function(d) { return d.y; });

            labels
              .attr("x", function(d) { return d.x; })
              .attr("y", function(d) { return d.y; });
          }

          function dragstarted(d) {
            if (!d3.event.active)
              simulation.alphaTarget(0.3).restart();

            d.fx = d.x;
            d.fy = d.y;
          }

          function dragged(d) {
            d.fx = d3.event.x;
            d.fy = d3.event.y;
          }

          function dragended(d) {
            if (!d3.event.active) simulation.alphaTarget(0);
            d.fx = null;
            d.fy = null;
          }

          function zoomed() {
            svg.attr("transform", d3.event.transform);
          }