Class: SimpleD3::Template

Inherits:
Object
  • Object
show all
Defined in:
lib/simple_d3/template.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(placeholder, settings) ⇒ Template

Returns a new instance of Template.



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# File 'lib/simple_d3/template.rb', line 22

def initialize(placeholder, settings)
  @placeholder = placeholder
  @settings = settings
end

Class Method Details

.template(placeholder, settings) ⇒ Object 



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# File 'lib/simple_d3/template.rb', line 3

def self.template(placeholder, settings)
  template = new(placeholder, settings)
  javascript = template.send(settings[:type])
  colors = settings[:colors].present? ? template.colors(settings[:colors]) : "d3.scale.category10()"
  
  graph = <<-EOJS
  <script type="text/javascript">
    //Width and height
    var w = #{settings[:width]};
    var h = #{settings[:height]};

    //Easy colors accessible via a 10-step ordinal scale
    var colors = #{colors};

    #{javascript}
  </script>
  EOJS
end

Instance Method Details

#bar ⇒ Object 



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# File 'lib/simple_d3/template.rb', line 35

def bar
  graph = <<-EOJS

    var xScale = d3.scale.ordinal()
            .domain(d3.range(data.length))
            .rangeRoundBands([0, w], 0.05);

    var yScale = d3.scale.linear()
            .domain([0, d3.max(data)])
            .range([0, h]);

    //Create SVG element
    var #{@placeholder} = d3.select("##{@placeholder}")
          .append("svg")
          .attr("width", w)
          .attr("height", h);

    //Create bars
    #{@placeholder}.selectAll("rect")
       .data(data)
       .enter()
       .append("rect")
       .attr("x", function(d, i) {
          return xScale(i);
       })
       .attr("y", function(d) {
          return h - yScale(d);
       })
       .attr("width", xScale.rangeBand())
       .attr("height", function(d) {
          return yScale(d);
       })
       .attr("fill", function(d, i) {
          return colors(i);
        })
       .on("mouseover", function(d) {

        //Get this bar's x/y values, then augment for the tooltip
        var xPosition = parseFloat(d3.select(this).attr("x")) + xScale.rangeBand() / 2;
        var yPosition = parseFloat(d3.select(this).attr("y")) + 14;

        //Create the tooltip label
        #{@placeholder}.append("text")
           .attr("id", "tooltip")
           .attr("x", xPosition)
           .attr("y", yPosition)
           .attr("text-anchor", "middle")
           .attr("font-family", "sans-serif")
           .attr("font-size", "11px")
           .attr("font-weight", "bold")
           .attr("fill", "black")
           .text(d);

       })
       .on("mouseout", function() {

        //Remove the tooltip
        d3.select("#tooltip").remove();

       });

  EOJS
end

#colors(color_array) ⇒ Object 



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# File 'lib/simple_d3/template.rb', line 27

def colors(color_array)
  colors = <<-EOJS
    d3.scale.ordinal()
      .range(#{color_array.to_s})
      .domain(d3.range(0,#{color_array.size}))
  EOJS
end

#pie ⇒ Object 



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# File 'lib/simple_d3/template.rb', line 99

def pie
  pie = <<-EOJS
    var outerRadius = w / 2;
    var innerRadius = 0;
    var arc = d3.svg.arc()
            .innerRadius(innerRadius)
            .outerRadius(outerRadius);

    var pie = d3.layout.pie();

    //Create SVG element
    var #{@placeholder} = d3.select("##{@placeholder}")
          .append("svg")
          .attr("width", w)
          .attr("height", h);

    //Set up groups
    var arcs = #{@placeholder}.selectAll("g.arc")
            .data(pie(data))
            .enter()
            .append("g")
            .attr("class", "arc")
            .attr("transform", "translate(" + outerRadius + "," + outerRadius + ")");

    //Draw arc paths
    arcs.append("path")
        .attr("fill", function(d, i) {
          return colors(i);
        })
        .attr("d", arc);

    //Labels
    arcs.append("text")
        .attr("transform", function(d) {
          return "translate(" + arc.centroid(d) + ")";
        })
        .attr("text-anchor", "middle")
        .text(function(d) {
          return d.value;
    });
  EOJS
end