d3.js 绘制线图

d3.js_draw_line_chart

    var svg = d3.select("d3_chart");


    var data = [4, 8, 15, 16, 23, 42];
    var width = 420, barHeight = 20;

    var svg = d3.select("d3_chart").append("svg:svg")
    .attr("width", width)
    .attr("height", barHeight);

    var gradient = svg.append("svg:defs")
    .append("svg:linearGradient")
    .attr("id", "gradient")
    .attr("x1", "0%")
    .attr("y1", "0%")
    .attr("x2", "100%")
    .attr("y2", "100%")
    .attr("spreadMethod", "pad");

    gradient.append("svg:stop")
    .attr("offset", "0%")
    .attr("stop-color", "#0c0")
    .attr("stop-opacity", 1);

    gradient.append("svg:stop")
    .attr("offset", "100%")
    .attr("stop-color", "#c00")
    .attr("stop-opacity", 1);
  var x = d3.scale.linear()
.domain([0, d3.max(data)])
    .range([0, width]);

    var chart = d3.select(".chart")
    .attr("width", width)
    .attr("height", barHeight * data.length);

    var bar = chart.selectAll("g")
.data(data)
    .enter().append("g")
    .attr("transform", function(d, i) { return "translate(0," + i * barHeight + ")"; });

    bar.append("rect")
    .attr("width", x)
    .attr("height", barHeight - 1)
    .style("fill", "url(#gradient)");


    bar.append("text")
    .attr("x", function(d) { return x(d) - 3; })
    .attr("y", barHeight / 2)
    .attr("dy", ".35em")
    .text(function(d) { return d; });