TP2_Dataviz_D3_intro_Thomas_DIOT

forked from romsson's block: simple line chart from dataset

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    .line {
      fill: none;
      stroke: black;
      stroke-width: 1.5px;
    }
    circle {
      opacity: 0.1;
    }
    .value {
      opacity : 0;
    }
  
  </style>
</head>

// Adapted from https://blockbuilder.org/romsson/855207ac5fb5c170de59b9c69ea56012
    
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500);

var width = 800;
    var height = 400;

// How to parse (i.e. look for data) from the dataset
    var parseDate = d3.timeParse("%Y-%m");
    // How to display the parsed data
    var displayDate = d3.timeFormat("%b %y");
    // How to format the values
    var displayValue = d3.format(",.0f");
    
    // Ordinal scale
    var x = d3.scaleTime()
        .range([0, width]);

// Linear scale
    var y = d3.scaleLinear()
        .range([height, height - 200]);

var line = d3.line()
        .x(function(d) { return x(d.date); })
        .y(function(d) { return y(d.value); });
    
    var g = svg.append("g")
    	.attr("transform", "translate(50, 0)");
    
   	d3.json("dataset.json", function(error, data) {
	  	if (error) throw error;

// Pre-processing
      data.forEach(function(d) {
				d.value = +d.value;
        d["date"] = parseDate(d["date"]);
      });
      
      x.domain(d3.extent(data, function(d) { return d.date; }));
			y.domain([0, d3.max(data, function(d) { return d.value; })]);
      
      svg.selectAll(".label").data(data).enter()
       .append("text")
      	.attr("class", "label")
        .text(function(d, i) { return displayDate(d.date); })
        .attr("y", 420)
        .attr("x", function(d) { return x(d.date); })
        .style("font-size", 12)
        .style("font-family", "monospace");

// Display last value
      g.selectAll(".value").data([data[data.length -1]]).enter()
       .append("text")
        .text(function(d, i) { return displayValue(d.value); })
        .attr("class", "lastvalue")
        .attr("y", function(d) { return y(d.value); })
        .attr("x", width + 30)
        .style("font-size", 20)
        .style("font-family", "monospace");

g.selectAll(".line").data([data]).enter().append("path")
        .attr("class", "line")
        .attr("d", line);
      
      g.selectAll("circle").data(data).enter().append("circle")
      	.attr("cx", function(d, i) { return x(d.date); })
    		.attr("cy", function(d) { return y(d.value); })
    		.attr("r", 10)
      	.attr("class", "dot")
    		.on("mouseover", function(d, i) {
      	d3.select(this).style("fill", "red").style("opacity", 1);
          
        g.selectAll(".value").data(data).enter().append("text")
          .text(function(d, i) { return displayValue(d.value); })
      	  .attr("class", "value")
      	  .attr("y", function(d) { return y(d.value) - 20; })
     	   	.attr("x", function(d) { return x(d.date);})
      
        d3.selectAll("text.value")
            .filter(function(e, j) {return i === j; })
          	.style("opacity", "1")
          	.style("font-size", 12)
     	   		.style("font-family", "monospace");
        
        d3.selectAll("line")
          .filter(function(e, j) {return i === j; })
        	.style("font-size", 12)
          .style("opacity", "1");
        })    
      
        .on("mouseout", function(d, i) {
     		d3.select(this).style("fill", "black").style("opacity", 0.1);
      	
        d3.selectAll("text.value")
            .filter(function(e, j) {return i === j; })
        		.style("font-size", 12)
          	.style("opacity", "0");
        
        d3.selectAll("line")
          	.filter(function(e, j) {return i === j; })
        		.style("font-size", 12)
          	.style("opacity", "0");
    		});
      
      g.selectAll("dashedLine").data(data).enter().append("line")
			 .attr("x1", function(d, i) { return x(d.date);})
			 .attr("y1", function(d, i) { return y(d.value);})
			 .attr("x2", function(d, i) { return x(d.date);})
       .attr("y2", height)
     	 .style("stroke-dasharray", ("3, 3"))
       .style("stroke", "black")
       .style("opacity", 0);
      
    });

</script>
</body>

https://d3js.org/d3.v4.min.js