var w = 1000,
    h = 500,
    fill = d3.scale.category20()
    trans=[0,0]
    scale=1;

var brush = d3.svg.brush()
   .on("brushstart", brushstart)
   .on("brush", brushing)
   .on("brushend", brushend);

//set brush constraints to full width 
brushX=d3.scale.linear().range([0, w]), 
brushY=d3.scale.linear().range([0, h]);

var vis = d3.select("#chart")
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    .attr("width", w)
    .attr("height", h)
    .attr("pointer-events", "all")
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    .attr('class', 'brush') 
    .call(brush.x(brushX).y(brushY))
    //.call(d3.behavior.zoom().on("zoom", redraw))
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// colors selected nodes in red
function color_node(node) {
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    else { return fill(node.group);}
}

function brushstart() {
    // do whatever you want on brush start
}

function brushing() {
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}

function brushend() {
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  vis.selectAll("circle").attr("fill", function(d) {
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}

function redraw() {
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  scale=d3.event.scale;

  vis.attr("transform",
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}

var draw = function(json) {

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      .charge(-120)
      .linkDistance(30)
      .nodes(json.nodes)
      .links(json.links)
      .size([w, h]);

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      .data(json.links)
    .enter().append("svg:line")
      .attr("class", "link")
      .style("stroke-width", function(d) { return Math.sqrt(d.value); })
      .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; });

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      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; })
      .attr("r", 5)
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      link
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        .attr("y1", function(d) { return d.source.y; })
        .attr("x2", function(d) { return d.target.x; })
        .attr("y2", function(d) { return d.target.y; });

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  var n = data.nodes.length;
  force.start();
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};

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