D3條形圖中第一個條之前的不需要的空白空間

Question

我正試圖將數據集填充到D3的條形圖數據中。我使用這個例子從D3：http://bl.ocks.org/mbostock/3885304

這裏是我的樣本數據：

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

這是圖表的繪製代碼。

var margin = {top: 20, right: 20, bottom: 30, left: 40}, 
     width = (960 - margin.left - margin.right) * data.length/50, 
     height = 500 - margin.top - margin.bottom; 

    var x = d3.scale.ordinal() 
     .domain([0,1]) 
     .rangeRoundBands([0, width], 0.1); 

    var y = d3.scale.linear() 
     .range([height, 0]); 

    var xAxis = d3.svg.axis() 
     .scale(x) 
     .orient("bottom") 


    var yAxis = d3.svg.axis() 
     .scale(y) 
     .orient("left") 
     .ticks(10, "%"); 

    var svg = d3.select("body").append("svg") 
     .attr("width", width + margin.left + margin.right) 
     .attr("height", height + margin.top + margin.bottom) 
     .append("g") 
     .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); 
     x.domain(data.map(function(d) { return d.name; })); 
     y.domain([0, d3.max(data, function(d) { return d.members_count; })]); 

     svg.append("g") 
      .attr("class", "x axis") 
      .attr("transform", "translate(0," + height + ")") 
      .call(xAxis); 

     svg.append("g") 
      .attr("class", "y axis") 
      .call(yAxis) 
     .append("text") 
      .attr("transform", "rotate(-90)") 
      .attr("y", 6) 
      .attr("dy", ".71em") 
      .style("text-anchor", "end") 
      .text("Frequency"); 

     svg.selectAll(".bar") 
      .data(data) 
     .enter().append("rect") 
      .attr("class", "bar") 
      .attr("fill","green") 
      .attr("x", function(d) { return x(d.name); }) 
      .attr("width", x.rangeBand()) 
      .attr("y", function(d) { return y(d.members_count); }) 
      .attr("height", function(d) { return height - y(d.members_count); }); 

這個問題我得到的是，我有一些白色的空間看起來醜陋。此空間位於第1個酒吧之前，也位於圖表的最後一個酒吧之後。我曾嘗試調整酒吧的x值，但我認爲這不是一個好的方法。

當數據集很小時，這個空間不會來。但是當數據集很大時，這個空間就會出現。我如何從開始和結束時刪除這個空間。

Answer 1

問題是與這條線在規模：

.rangeRoundBands([0, width], 0.1); 

當存在未指定第三個參數outerPadding它增加之前和由padding參數爲每個條產生的圖表額外的空間後。您已將padding設置爲0.1。爲了解決這個問題設置outerPadding參數：

var x = d3.scale.ordinal() 
    .domain([0,1]) 
    .rangeRoundBands([0, width], 0.1, 0); 

這裏更新您的代碼：http://jsfiddle.net/ojntup1a/