D3 Examples - Class 6-MT

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<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
.line {
  fill: blue;
  stroke: red;
  stroke-width: 2px;
}
  .grid line {
  stroke: lightgrey;
  stroke-opacity: 0.7;
  shape-rendering: crispEdges;
}
​
.grid line {
  stroke: lightgrey;
  stroke-opacity: 0.7;
  shape-rendering: crispEdges;
}
​
.grid path {
  stroke-width: 0;
}
  
</style>
<body>
​
<!-- load the d3.js library -->     
<script src="https://d3js.org/d3.v4.min.js"></script>
​
  <script>
// set the dimensions and margins of the graph
 margin = {top: 50, right: 20, bottom: 60, left: 60},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
    
// parse the date / time
var parseTime = d3.utcParse("%Y-%m-%dT%H:%M:%S.%LZ")
 
// set the ranges
var x = d3.scaleTime().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);
    
// define the line
var valueline = d3.line()
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.close); });
    
// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 + ")");
    
// Get the data
  var url = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.csv";
d3.csv(url, function(error, data) {
  if (error) throw error;
  // format the data
  data.forEach(function(d) {
      d.time = parseTime(d.time);
      d.mag = +d.mag;
    
​
  });
  
  // Scale the range of the data
  x.domain(d3.extent(data, function(d) { return d.time; }));
  y.domain([0, d3.max(data, function(d) { return d.mag; })]);
  // Add the valueline path.
  svg.append("path")
      .data([data])
      .attr("class", "line")
      .attr("d", valueline);
  
   // Add the scatterplot
  svg.selectAll("dot")
      .data(data)
    .enter().append("circle")
      .attr("r", 2.5)
  
      .attr("cx", function(d) { return x(d.time); })
      .attr("cy", function(d) { return y(d.mag); });
  
  // Add the X Axis
    svg.append("g")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));
  
 // text label for the x axis
  svg.append("text")             
      .attr("x", 480 )
      .attr("y",  420 )
      .style("text-anchor", "middle")
      .text("Date/Time");
             
  // Add the Y Axis
  svg.append("g")
      .call(d3.axisLeft(y));
  // text label for the y axis
   svg.append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 0 - margin.left)
      .attr("x",0 - (height / 2))
      .attr("dy", "1em")
      .style("text-anchor", "middle")
      .text("Magnitude"); 
  
  // add a title
  svg.append("text")
      .attr("x", (width / 2))               
      .attr("y", 0 - (margin.top / 2))
      .attr("text-anchor", "middle")    
      .style("font-size", "20px") 
      .style("text-decoration", "underline")    
      .text("Scatterplot of Magnitude vs Date/Time of Earthquakes last week");
  
  // add the X gridlines
  svg.append("g")           
      .attr("class", "grid")
      .attr("transform", "translate(0," + height + ")")
      .call(make_x_gridlines()
          .tickSize(-height)
          .tickFormat("")
      )
​
  // add the Y gridlines
  svg.append("g")           
      .attr("class", "grid")
      .call(make_y_gridlines()
          .tickSize(-width)
          .tickFormat("")
      )
​
  
});
  
</script>
</body>
    