d3.js - How to display GeoJson data with d3js at a specific extent and zoom by default? -


i benefit regarding aspect. loaded basic geojson file d3js , trying display whole area default. currently, default behavior bit "zoomed-in" , cannot see entire area unless zoom out bit. if use smaller area (like county) "zoomed-out";

what know how can make area containing map show extent like.

the following example 1 "zoomed-in":

current behavior here: https://lh6.googleusercontent.com/-398lxviqwvg/u6widiwtlti/aaaaaaaaaje/heamhdgrgrs/s1600/wrong.png

desired behavoir here: https://lh6.googleusercontent.com/-w3uj6m3uwbi/u6wimurvuii/aaaaaaaaajm/ufcno-gzm30/s1600/good.png

my current code following:

<!doctype html> <html lang="en">   <head>     <meta charset="utf-8">     <title>display map</title>     <script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script>       <style type="text/css">        body {         font: 10px sans-serif;       }        </style>       </head>      <body> <script>  // variables var svgwidth  = 400,     svgheight = 400,     margin = {"top": 25, "right": 25, "bottom": 25, "left": 25},     width  = svgwidth  - margin.left - margin.right,     height = svgheight - margin.top  - margin.bottom;  // mexico path (var boundarypath) taken // http://upload.wikimedia.org/wikipedia/commons/c/c5/blank_mexico_map%2c_no_states.svg // taken personal, learning purposes var boundarypath = "[][][]][][][]"  // create svg viewport var svgviewport = d3.select("body").append("svg")     .attr("width",  width  + margin.left + margin.right)     .attr("height", height + margin.top  + margin.bottom)     .style("border", "1px solid");  function zoomfunction() {   d3.select("path")     .attr("transform",         "translate(" + d3.event.translate         + ") scale (" + d3.event.scale + ")"); }  var zoom = d3.behavior.zoom()     .scaleextent([0.2, 10])     .on("zoom", zoomfunction);  // define inner drawing space var innerspace = svgviewport.append("g")     .attr("class", "inner_space")     .attr("transform", "translate(" + margin.left + "," + margin.top + ")")     .call(zoom);  innerspace.append("g").attr("class", "hidden rectangle")     .append("rect")     .attr("class", "background")     .attr("x", function(d, i) { return 0; })     .attr("y", function(d, i) { return 0; })     .attr("width", function(d, i) { return width; })     .attr("height", function(d, i) { return height; })     .style("fill", "white");  // draw country path var boundarypath = innerspace.append("path")     .attr("d", boundarypath)     .attr("fill", "gray");              </script>      </body> </html>

thank time,


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