4.5 bar chart | color

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<script src="https://d3js.org/d3.v4.min.js" charset="utf-8"></script>

<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:11px;
  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;
  stroke-opacity:1;
  stroke:white;
  stroke-dasharray:2;
}

</style>
</head>

<body>
  

<p id="h1">BAR CHART | COLOUR</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>  
  
<script>

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

//Data loading
d3.csv(
  "https://gist.githubusercontent.com/sandravizz/d9f965eea8c3884e20bbb83d03a07dab/raw/7216fcd609324cebf28bbc3142c0ffc6f8823807/OECD%2520Countries%2520air%2520pollution%25202017",
  prepare,
  data => {

//Check
  console.log(data);

//Sort data by value
  data.sort((b, a) => {return a.Value - b.Value;});

//Y scale
  var y = d3.scaleLinear()
    	.domain([0, d3.max(data, d => d.Value)])
    	.range([h - 20, 0]);

//Call the Y Axis
  svg.append("g")
    	.attr("class", "y-axis")
    	.attr("transform", `translate(20, 20)`)
    	.call(d3.axisLeft()
     				   .scale(y)
               .ticks(3)
               .tickPadding(10));

//X scale
  var x = d3.scaleBand()
    	.domain(data.map(d => d.LOCATION))
    	.rangeRound([10, w])
    	.paddingInner(0.1);

//X axis
  svg.append("g")
      .attr("class", "x-axis")
      .attr("transform", `translate(0, ${h})`)
      .call(d3.axisBottom()
    					.scale(x))
      .selectAll("text")
      .attr("y", 6)
      .attr("x", 0)
      .attr("transform", "rotate(35)")
      .style("text-anchor", "start");

//Color Scale
  var c = d3.scaleLog()
    	.domain(d3.extent(data, d => d.Value))
    	.range(['#8ff798', '#85f6fa'])

//Drawing the rects
  svg.selectAll('rect')
    	.data(data)
    	.enter()
      .append('rect')
      .style('fill', d => c(d.Value))
    	.attr('width', x.bandwidth())
    	.attr('x', d => x(d.LOCATION))
      .attr('y', d => y(d.Value))
    	.attr('height', d => h - y(d.Value))
});

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

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

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