move show_bargraph into js helper file

1 files changed, 88 insertions, 0 deletions

diff --git a/public/js/d3funcs.js b/public/js/d3funcs.js
new file mode 100644
index 0000000..4fafb42
--- /dev/null
+++ b/public/js/d3funcs.js
@@ -0,0 +1,88 @@
+show_bargraph = function(datasource, title, xlab, ylab) {
+  var margin = {top: 40, right: 20, bottom: 30, left: 40},
+      width = 960 - margin.left - margin.right,
+      height = 500 - margin.top - margin.bottom;
+  
+  var formatPercent = d3.format(".0%");
+  
+  var x = d3.scale.ordinal()
+      .rangeRoundBands([0, width], .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");
+  //    .tickFormat(formatPercent);
+  
+  var tip = d3.tip()
+    .attr('class', 'd3-tip')
+    .offset([-10, 0])
+    .html(function(d) {
+      return "<strong>Frequency:</strong> <span style='color:red'>" + d.y + "</span>";
+    })
+  
+  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 + ")");
+  
+  svg.call(tip);
+  
+  d3.tsv(datasource, type, function(error, data) {
+    if (error) console.warn(error);
+    x.domain(data.map(function(d) { return d.x; }));
+    y.domain([0, d3.max(data, function(d) { return d.y; })]);
+  
+    svg.append("g")
+        .attr("class", "x axis")
+        .attr("transform", "translate(0," + height + ")")
+        .call(xAxis)
+      .append("text")
+        .attr("x", width / 2)
+        .attr("y", 30)
+        .style("text-anchor", "middle")
+        .text(xlab);
+  
+    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(ylab);
+  
+    svg.append("text")
+      .attr("x", (width / 2))
+      .attr("y", 0 - (margin.top / 2))
+      .attr("text-anchor", "middle")
+      .style("font-size", "16px")
+      .style("text-decoration", "underline")
+      .text(title);
+  
+    svg.selectAll(".bar")
+        .data(data)
+      .enter().append("rect")
+        .attr("class", "bar")
+        .attr("x", function(d) { return x(d.x); })
+        .attr("width", x.rangeBand())
+        .attr("y", function(d) { return y(d.y); })
+        .attr("height", function(d) { return height - y(d.y); })
+        .on('mouseover', tip.show)
+        .on('mouseout', tip.hide)
+  
+  });
+  
+  function type(d) {
+    d.y = +d.y;
+    return d;
+  }
+}