6.6 area | reference

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

<p id="h1">AREA | REFERENCE</p>
<div id="link"> by
<a href="https://slides.com/sandravizmad">SANDRA</a> | <a href="https://data.oecd.org/forest/forest-resources.htm">DATA</a></div>

<style>

/*Defining text stylings*/

#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:300;
}

#link {
	font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
	margin:5px 0px 0px 22px;
  color:white;
}

a:link, a:visited, a:active {
	text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}

body {
  background-color:#011227;
}

/*Defining axis stylings*/

.y-axis text, .x-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:10px;
  opacity:1;
  fill:white;
}

.y-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}

.x-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}

.y-axis line, .x-axis line {
  fill:none;
  stroke-width:0.1;
  stroke-opacity:0.5;
  stroke:white;
  stroke-dasharray:2;
}

/*Defining chart stylings*/

.area {
 stroke-width:1.5px;
 stroke:#8ff798;
 fill-opacity:0.2;
 fill:#8ff798;
}

.danger {
 stroke-width:1.5px;
 stroke:#85f6fa;
 fill-opacity:0.2;
 fill:#85f6fa;
}

.Label {
	font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:12px;
  opacity:1;
  fill:#8ff798;
}

</style>
</head>

//Margin conventions
var m = {top:100, right:50, bottom:50, left:40}
    w = 700 - m.left - m.right,
    h = 800 - m.top - m.bottom;

//Container
var svg = d3.select("body")
    .append("svg")
    .attr("width", w + m.left + m.right)
    .attr("height", h + m.top + m.bottom)
    .append("g")
    .attr("transform", `translate(${m.left}, ${m.top})`);

//Define the format
var parseDate = d3.timeParse("%Y");
var formatNumber = d3.format(".2s");

//Data loading
d3.csv(
  'https://gist.githubusercontent.com/sandravizz/d4c0681731f16e14e7ed10fc10507f03/raw/904f049daa0d5060926f746a1b1a95b019895006/OECD%2520Air%2520pollution%2520EU28%252090-17',
  prepare,
  data => {

//X scale
  var x = d3.scaleLinear()
  	  .domain(d3.extent(data, d => d.TIME))
  	  .rangeRound([0, w])

//X axis
  svg.append("g")
      .attr("class", "x-axis")
  	  .attr("transform", `translate(0, ${h})`)
      .call(d3.axisBottom()
              .scale(x)
      		    .ticks(3)
   					  .tickSize(-h)
              .tickPadding(20)
              .tickFormat(formatNumber))
     .selectAll("text")
     .attr("y", 6)
     .attr("x", 0)
     .style("text-anchor", "start");

//Y scale
  var y = d3.scaleLinear()
  	  .domain([0, d3.max(data, d => d.Value)])
  		.range([h, 0]);

//Y axis
  svg.append("g")
      .attr("class", "y-axis")
      .attr("transform", `translate(0, ${0})`)
      .call(d3.axisLeft()
              .scale(y)
      		    .ticks(5)
              .tickSize(-w)
  				  	.tickPadding(10));   
    
  //Area generator, starts at h ends at min 
  var area = d3.area()
  		.defined(d => d.Value >= d3.min(data, d => d.Value))
  		.x(d => x(d.TIME))
  		.y1(() => y(d3.min(data, d => d.Value)))
  		.y0(h);

//Draw the area
  svg.append("path")
  	  .datum(data)
  	  .attr("class", "area")
  	  .attr("d", area);
    
  //Area generator, starts at min ends with the value
  var dangerArea = d3.area()
      .x(d => x(d.TIME))
      .y0(() =>y(d3.min(data, d => d.Value)))
      .y1(d => y(d.Value));

//Draw the area
  svg.append("path")
      .datum(data)
      .attr("class", "danger area")
      .attr("d", dangerArea);

//Label 350 ppm line
  svg.append("text")
  	  .attr("class", "Label")
  	  .attr("x", 10)
  	  .attr("y", y(d3.min(data, d => d.Value) - 0.5))
  	  .text("REFERENCE");

});

//Make sure all variables are numbers
function prepare (d) {
  d.Value = +d.Value,
  d.TIME = parseDate(d.TIME)
  return d;
}

</script>
</body>
</html>

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