TP 2.1 Interactive Line Chart

forked from romsson's block: TP 2.1 Interactive Line Chart

forked from CharlesGaydon's block: TP 2.1 Interactive Line Chart

<!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 {
      r: 9;
      opacity:.2;
      fill: gray;
    }

</style>
</head>

<body>
  <script>
/*
#####################  COMMENTS  ###########################################
      Last edited : 09/11/20177
      Author : Charles Gaydon, 
      Based on
      https://blockbuilder.org/romsson/855207ac5fb5c170de59b9c69ea56012
      and part of the class 
      https://lyondataviz.github.io/teaching/lyon1-m2/2017/tp2.html
###########################################################################
*/

var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500);

var width = 800;
    var height = 400;

// See formats https://bl.ocks.org/zanarmstrong/raw/05c1e95bf7aa16c4768e/
    // Data sample {"name": "G", "value": 10, "date": "2016-07"}
    var parseDate = d3.timeParse("%Y-%m");
    var displayDate = d3.timeFormat("%b %y");
    var displayValue = d3.format(",.0f");
    
    // Ordinal scale
    var x = d3.scaleTime()
        .range([0, width]);

// Linear scale
    var y = d3.scaleLinear()
        .range([height, height - 250]);

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(45, 0)")
    
    d3.json("data.json", function(error, data) {
      if (error) throw error;

// Pre-processing
      data.forEach(function(d) {
        console.log(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; })]);
      
      //create date label for each point
      g.selectAll(".label").data(data).enter()
       .append("text")
        .attr("class", "label")
        .text(function(d, i) { return displayDate(d.date); })
        .attr("y", 400)
        .attr("x", function(d) { return x(d.date); })
        .style("font-size", 10)
        .style("font-family", "monospace");

// Display last value
      g.selectAll(".last_val").data([data[data.length -1]]).enter()
       .append("text")
        .text(function(d, i) { return displayValue(d.value); })
        .attr("class", "value")
        .attr("y", function(d) { return y(d.value); })
        .attr("x", width + 10)
        .style("font-size", 20)
        .style("font-family", "monospace");
      
      // create circles for each point
      g.selectAll(".cir").data(data).enter()
      .append('circle')
        .attr("cx",function(d,i){return x(d.date)})
        .attr("cy",function(d) { return y(d.value); })
        .attr("r",9)
        .style("opacity",0.3)
        .on("mouseover", function(d, i){
            d3.select(this)
              .style("fill", "red")
              .style("opacity",0.8);
        
            d3.selectAll(".label_v")
              .filter(function(el,j){return(i==j)} )
              .style("opacity",1);
        		d3.selectAll(".verline")
            	.filter(function(el,j){return(i==j)})
            	.style("stroke-opacity",1)
        })
        .on("mouseout", function(d, i) {
          d3.select(this).transition().duration(0)
          .style("fill", "gray")
          .style("opacity",.3);
        d3.selectAll(".label_v")
          .style("opacity",0);
        d3.selectAll(".verline")
           .filter(function(el,j){return(i==j)})
           .style("stroke-opacity",0)
      });

//create value mark for each point
      g.selectAll(".label_val").data(data.slice(0,data.length-1)).enter()
      .append("text")
        .text(function(d, i) { return displayValue(d.value); })
        .attr("class", "label_v")
        .attr("y", function(d) { return y(d.value); })
        .attr("x", function(d, i) {return(x(d.date) + 10+5)})
        .style("font-size", 15)
        .style("font-family", "monospace")
        .style("opacity",0);
     
    	//create line mark for each point
   	 g.selectAll(".verline").data(data).enter()
    	.append("line")
     	.attr("class", "verline")
			.style("fill","none")
      .style("stroke","black")
      .style("stroke-width","0.7px")
     	.style("stroke-opacity","0")
     	.attr("x1",function(d,i){return x(d.date)})
			.attr("y1",function(d) { return y(d.value); })
     	.attr("x2",function(d,i){return x(d.date)})
			.attr("y2",height)
     	.attr("stroke-dasharray", ("5,3")) ;
    
      g.selectAll(".line").data([data]).enter().append("path")
        .attr("class", "line")
        .attr("d", line);     
    });
    g.append("text")
        .attr("x", (width / 2))             
        .attr("y", 100)
        .attr("text-anchor", "middle")  
        .style("font-size", "20px") 
        .style("text-decoration", "underline")  
        .text("My first Interactive Line Chart");

</script>
</body>

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