MTClass/.block

## .block
license: mit

## README.md

      
    Raw
  

              README.md
            
          
    Built with blockbuilder.org

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<title>Class 5 v2</title>
<style>

body {
  position: absolute;
  margin: 0px;
  font: 16px sans-serif;
}

svg {
  background-color: #4682b4;
}

.info {
  font-family: sans-serif;
  color: #000;
  position: absolute;
  top: 450px;
  left: 800px;
}

path {
  fill: #555555;
  stroke: #aaaaaa;
}

/* NEW: style the earthquakes */
path.quake {
  fill: crimson;
}

</style>

<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/topojson.v2.min.js"></script>

<!-- NEW: Load the D3 legend plugin -->
<script src="d3.legend.js"></script>

<body>
<script>

var width = 960, height = 500;

var data;  // declare a global variable

// NEW: Add a color scale
var colors = d3.scaleOrdinal()
        .domain(['< 1', '1-2', '2-3', '3-4', '4-5', '> 5'])
        .range(d3.schemeCategory10)

// NEW: Configure the legend
d3.legend = function() {

  // Defaults
  var t = [0, 0],
      cb = null,
      colors = d3.scaleOrdinal()
        .domain(["A", "B", "C", "D"])
        .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b"]);

  var box = 38,
      padding = 2,
      dx = box + padding;

  function legend(selection) {
    selection.each(function() {
      var legend = d3.select(this).selectAll(".legend")
        .data( colors.domain().slice().reverse() )
      .enter().append("g")
        .attr("class", "legend")
        .attr("transform", function(d, i) { return "translate(" + t[0] + "," + (t[1] + i * dx) + ")"; });

      legend.append("rect")
        .attr("x", 0 )
        .attr("width", box)
        .attr("height", box)
        .style("fill", colors);

      legend.append("text")
        .attr("x", - 2 * padding )
        .attr("y", box / 2)
        .attr("dy", ".35em")
        .style("text-anchor", "end")
        .text(function(d) { return d; });

      if (typeof cb == "function") cb();
    })
  }

  legend.translate = function(_) {
    if (!arguments.length) return t;
    t = _;
    return legend;
  };

  legend.colors = function(_) {
    if (!arguments.length) return colors;
    colors = _;
    return legend;
  };

  legend.cb = function(_) {
    if (!arguments.length) return cb;
    cb = _;
    return legend;
  };

  return legend;
}

var legend = d3.legend()
    .translate([ width - 50 , height / 4 ])
    .colors(colors);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .on("mousemove", mousemoved)
    .call(legend);  // NEW: Add the legend to the chart

var layer1 = svg.append("g");
var layer2 = svg.append("g");

// Add a <div> element to label the mouse position
var info = d3.select("body").append("div")
    .attr("class", "info");

var projection = d3.geoAlbersUsa();

var path = d3.geoPath()
    .projection(projection);

// Earthquake data
var usgs = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.geojson";

// Topojson for US states
var url = "https://umbcvis.github.io/classes/class-03/us.json"

d3.json(url, plotStates);
d3.json(usgs, plotQuakes);

function plotStates(error, json) {

  // Convert topojson to an Array of GeoJSON features
  // This defines "data", a global variable that can be manipulated in the developer console
  data = json.objects.us.geometries.map(function(d) { return topojson.feature(json, d); })

  // Plot the features (states) -- one <path> element for each state
  layer1.selectAll("path")
      .data(data)
    .enter()
      .append("path")
      .attr("d", path);
}

function plotQuakes(error, json) {
  if (error) return console.log(error);

  // Global variable, data, will be visible in the console
  data = json;

  // Extract an array of feature objects, one for each earthquake
  var features = json.features;

  // Plot the earthquakes
  layer2.selectAll("path.quake")
      .data(features)
    .enter().append("path")
      .attr("class", "quake")
      .attr("d", path)
      .style('fill', quakeColor); // NEW: Add magnitude-dependent color

  // NEW: Function returns magnitude-dependent color for earthquakes
  function quakeColor(d) {
    var m = Math.min(Math.floor(Math.abs(d.properties.mag)), colors.domain().length);
    var label = colors.domain()[m];
    return colors(label);
  }
}

// Label the geographic coordinates of the mouse position on the map
function mousemoved() {
  info.text(formatLocation(projection.invert(d3.mouse(this)), projection.scale()));
}

// Format the text that will be displayed in the the <div> element on the map
function formatLocation(p, k) {
  var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f");
  return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " "
       + (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E");
}
</script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<title>Class 5 v2</title>
	<style>

	body {
	position: absolute;
	margin: 0px;
	font: 16px sans-serif;
	}

	svg {
	background-color: #4682b4;
	}

	.info {
	font-family: sans-serif;
	color: #000;
	position: absolute;
	top: 450px;
	left: 800px;
	}

	path {
	fill: #555555;
	stroke: #aaaaaa;
	}

	/* NEW: style the earthquakes */
	path.quake {
	fill: crimson;
	}

	</style>

	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script src="https://d3js.org/topojson.v2.min.js"></script>

	<!-- NEW: Load the D3 legend plugin -->
	<script src="d3.legend.js"></script>

	<body>
	<script>

	var width = 960, height = 500;

	var data; // declare a global variable

	// NEW: Add a color scale
	var colors = d3.scaleOrdinal()
	.domain(['< 1', '1-2', '2-3', '3-4', '4-5', '> 5'])
	.range(d3.schemeCategory10)

	// NEW: Configure the legend
	d3.legend = function() {

	// Defaults
	var t = [0, 0],
	cb = null,
	colors = d3.scaleOrdinal()
	.domain(["A", "B", "C", "D"])
	.range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b"]);

	var box = 38,
	padding = 2,
	dx = box + padding;

	function legend(selection) {
	selection.each(function() {
	var legend = d3.select(this).selectAll(".legend")
	.data( colors.domain().slice().reverse() )
	.enter().append("g")
	.attr("class", "legend")
	.attr("transform", function(d, i) { return "translate(" + t[0] + "," + (t[1] + i * dx) + ")"; });

	legend.append("rect")
	.attr("x", 0 )
	.attr("width", box)
	.attr("height", box)
	.style("fill", colors);

	legend.append("text")
	.attr("x", - 2 * padding )
	.attr("y", box / 2)
	.attr("dy", ".35em")
	.style("text-anchor", "end")
	.text(function(d) { return d; });

	if (typeof cb == "function") cb();
	})
	}

	legend.translate = function(_) {
	if (!arguments.length) return t;
	t = _;
	return legend;
	};

	legend.colors = function(_) {
	if (!arguments.length) return colors;
	colors = _;
	return legend;
	};

	legend.cb = function(_) {
	if (!arguments.length) return cb;
	cb = _;
	return legend;
	};

	return legend;
	}

	var legend = d3.legend()
	.translate([ width - 50 , height / 4 ])
	.colors(colors);

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height)
	.on("mousemove", mousemoved)
	.call(legend); // NEW: Add the legend to the chart

	var layer1 = svg.append("g");
	var layer2 = svg.append("g");

	// Add a <div> element to label the mouse position
	var info = d3.select("body").append("div")
	.attr("class", "info");

	var projection = d3.geoAlbersUsa();

	var path = d3.geoPath()
	.projection(projection);

	// Earthquake data
	var usgs = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.geojson";

	// Topojson for US states
	var url = "https://umbcvis.github.io/classes/class-03/us.json"

	d3.json(url, plotStates);
	d3.json(usgs, plotQuakes);

	function plotStates(error, json) {

	// Convert topojson to an Array of GeoJSON features
	// This defines "data", a global variable that can be manipulated in the developer console
	data = json.objects.us.geometries.map(function(d) { return topojson.feature(json, d); })

	// Plot the features (states) -- one <path> element for each state
	layer1.selectAll("path")
	.data(data)
	.enter()
	.append("path")
	.attr("d", path);
	}

	function plotQuakes(error, json) {
	if (error) return console.log(error);

	// Global variable, data, will be visible in the console
	data = json;

	// Extract an array of feature objects, one for each earthquake
	var features = json.features;

	// Plot the earthquakes
	layer2.selectAll("path.quake")
	.data(features)
	.enter().append("path")
	.attr("class", "quake")
	.attr("d", path)
	.style('fill', quakeColor); // NEW: Add magnitude-dependent color

	// NEW: Function returns magnitude-dependent color for earthquakes
	function quakeColor(d) {
	var m = Math.min(Math.floor(Math.abs(d.properties.mag)), colors.domain().length);
	var label = colors.domain()[m];
	return colors(label);
	}
	}

	// Label the geographic coordinates of the mouse position on the map
	function mousemoved() {
	info.text(formatLocation(projection.invert(d3.mouse(this)), projection.scale()));
	}

	// Format the text that will be displayed in the the <div> element on the map
	function formatLocation(p, k) {
	var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f");
	return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " "
	+ (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E");
	}
	</script>