pbogden/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Changes to assignment #5.  I believe this one does what you want.  3 changes are noted.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.bar {
  fill: steelblue;
}
.axis text {
  font: 10px sans-serif;
}
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
.chart text {
  font: 12px sans-serif;
}
</style>
<svg class="chart"></svg>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var data4console;						//Global variable for console inspection
var url = "http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.geojson";	//Earthquake data
var margin = {top: 20, right: 30, bottom: 30, left: 40},	//set the margins
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.linear()				//scaling the x data
    .range([0, width]);  // Note from PB: I removed the second argument, which was being ignored.

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

var xAxis = d3.svg.axis()				//creating an x axis
    .scale(x)
    .tickValues([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
    .orient("bottom");

var yAxis = d3.svg.axis()				//creating a y axis
    .scale(y)
    .orient("left");

var chart = d3.select(".chart")			//appending an svg g element, and transform (offset) by the margins
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.json(url, function(error, data) {	//calling the data
    if (error) return console.log(error);

    data4console = data						//assigning data to global var for console inspection

    quakesMag = [];  //create empty array for mags
    quakesMag  = data.features.map(function(d) { return d.properties.mag; });	//populate mag array with mag values
    quakesBin = [];  //create empty array to bin the mag values

    for (var i = 0; i < 10; i++) {//loop/increment while mag value less than 10
      quakesBin[i] = quakesMag.filter(function(d) { return d >= i && d < i + 1; }).length;  //populate mag bin array with binned mag values
    }

    // Goal: A histogram of earthquake magnitudes, with bin size of 1 (i.e, 0-1, 1-2, 2-3, etc.).
    // The X-axis will indicate the range in magnitudes for each bin.
    // The Y-axis will show the number of earthquakes in each bin.

    // the X scale maps from bin index, to position on the SVG -- Note from PB: I changed the upper limit
    x.domain([0, quakesBin.length]);  //set x domain from 0 to max mag

    y.domain([d3.min(quakesBin, function(d) { return d; }), d3.max(quakesBin, function(d) { return d; })]);  //set y domain from min mag-bin value to max mag-bin value

    var barWidth = width / quakesMag.length;  //set bar width to window width / # of quakes

    chart.append("g")//append x axis to chart
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);
    chart.append("g")//append y axis to chart
      .attr("class", "y axis")
      .call(yAxis);

    chart.append("text")//append y axis label
      .attr("text-anchor", "middle")
      .attr("x", -height/2)
      .attr("y", -1 - margin.left/3)
      .attr("dy", "-1em")
      .attr("transform", "rotate(-90)")
      .text("Earthquake Frequency");

    chart.append("text")//append x axis label
    .attr("text-anchor", "end")
    .attr("x", width/2)
    .attr("y", height + 2*margin.bottom/3 + 9)
    .text("Earthquake Magnitude");
    chart.append("text")      //append title
    .attr("text-anchor", "middle")
    .attr("x", width/2)
    .attr("y", -margin.top/2)
    .attr("dy", "+.75em")
    .text("Earthquake Occurences, 2.5 days");

    chart.selectAll(".bar")//create empty selection for bars
      .data(quakesBin)//data to use is the mag bins data
    .enter().append("rect")//append a rect for each mag bin
      .attr("class", "bar")

    chart.selectAll("rect")//update selection for all rect
      .data(quakesBin)   // NOTE from PB: Changed argument to quakesBin
      .attr("x", function(d, i) { return x(i); })  // NOTE from PB: Changed argument of x scale
      .attr("y", function(d) { return y(d); })//y location scaled from doamin to range, based on data
      .attr("height", function(d) { return height - y(d); })//not sure?????
      .attr("width", barWidth);  //set width of each bar

});

</script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>
	.bar {
	fill: steelblue;
	}
	.axis text {
	font: 10px sans-serif;
	}
	.axis path,
	.axis line {
	fill: none;
	stroke: #000;
	shape-rendering: crispEdges;
	}
	.chart text {
	font: 12px sans-serif;
	}
	</style>
	<svg class="chart"></svg>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script>
	var data4console; //Global variable for console inspection
	var url = "http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.geojson"; //Earthquake data
	var margin = {top: 20, right: 30, bottom: 30, left: 40}, //set the margins
	width = 960 - margin.left - margin.right,
	height = 500 - margin.top - margin.bottom;

	var x = d3.scale.linear() //scaling the x data
	.range([0, width]); // Note from PB: I removed the second argument, which was being ignored.

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

	var xAxis = d3.svg.axis() //creating an x axis
	.scale(x)
	.tickValues([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
	.orient("bottom");

	var yAxis = d3.svg.axis() //creating a y axis
	.scale(y)
	.orient("left");

	var chart = d3.select(".chart") //appending an svg g element, and transform (offset) by the margins
	.attr("width", width + margin.left + margin.right)
	.attr("height", height + margin.top + margin.bottom)
	.append("g")
	.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

	d3.json(url, function(error, data) { //calling the data
	if (error) return console.log(error);

	data4console = data //assigning data to global var for console inspection

	quakesMag = []; //create empty array for mags
	quakesMag = data.features.map(function(d) { return d.properties.mag; }); //populate mag array with mag values
	quakesBin = []; //create empty array to bin the mag values

	for (var i = 0; i < 10; i++) {//loop/increment while mag value less than 10
	quakesBin[i] = quakesMag.filter(function(d) { return d >= i && d < i + 1; }).length; //populate mag bin array with binned mag values
	}

	// Goal: A histogram of earthquake magnitudes, with bin size of 1 (i.e, 0-1, 1-2, 2-3, etc.).
	// The X-axis will indicate the range in magnitudes for each bin.
	// The Y-axis will show the number of earthquakes in each bin.

	// the X scale maps from bin index, to position on the SVG -- Note from PB: I changed the upper limit
	x.domain([0, quakesBin.length]); //set x domain from 0 to max mag

	y.domain([d3.min(quakesBin, function(d) { return d; }), d3.max(quakesBin, function(d) { return d; })]); //set y domain from min mag-bin value to max mag-bin value

	var barWidth = width / quakesMag.length; //set bar width to window width / # of quakes

	chart.append("g")//append x axis to chart
	.attr("class", "x axis")
	.attr("transform", "translate(0," + height + ")")
	.call(xAxis);
	chart.append("g")//append y axis to chart
	.attr("class", "y axis")
	.call(yAxis);

	chart.append("text")//append y axis label
	.attr("text-anchor", "middle")
	.attr("x", -height/2)
	.attr("y", -1 - margin.left/3)
	.attr("dy", "-1em")
	.attr("transform", "rotate(-90)")
	.text("Earthquake Frequency");

	chart.append("text")//append x axis label
	.attr("text-anchor", "end")
	.attr("x", width/2)
	.attr("y", height + 2*margin.bottom/3 + 9)
	.text("Earthquake Magnitude");
	chart.append("text") //append title
	.attr("text-anchor", "middle")
	.attr("x", width/2)
	.attr("y", -margin.top/2)
	.attr("dy", "+.75em")
	.text("Earthquake Occurences, 2.5 days");

	chart.selectAll(".bar")//create empty selection for bars
	.data(quakesBin)//data to use is the mag bins data
	.enter().append("rect")//append a rect for each mag bin
	.attr("class", "bar")

	chart.selectAll("rect")//update selection for all rect
	.data(quakesBin) // NOTE from PB: Changed argument to quakesBin
	.attr("x", function(d, i) { return x(i); }) // NOTE from PB: Changed argument of x scale
	.attr("y", function(d) { return y(d); })//y location scaled from doamin to range, based on data
	.attr("height", function(d) { return height - y(d); })//not sure?????
	.attr("width", barWidth); //set width of each bar

	});

	</script>