slope, one transition

Slope Chart

this slope chart will transition from one set of data to another on click of the update button.

To do:

enable going back to original data on re-click
color gradient based on difference between y1,y2

<!DOCTYPE html>
  <head>
    <meta charset="utf-8">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
    <style>
  
       * {
			margin: 0;
			padding: 0;
		}

#container {
			width: 800px;
			margin: 25px auto 25px auto;
			padding: 50px 50px 50px 50px;
			background-color: white;
		}
      
      .chartContainer {
			display: inline-block;
			width: 99%;
		}
       
      body {
				 margin:0;position:fixed;top:0;right:0;bottom:0;left:0; 
         font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
         font-size: 20px;
         font-style: bold;
			}

h1 {
        margin-bottom: 25px;
  			 font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
         font-size: 28px;
         font-style: bold;
			}

svg {
				background-color: white;
			}
			
			.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}
			
			.axis text {
				font-family: sans-serif;
				font-size: 11px;
			}
      
  circle {
      stroke-width: 4;
      fill: white;
      }
  
     circle.circles2b {
      stroke: white;
      stroke-width: 3;
      fill: white;
      }

circle.circles1b {
      stroke: white;
      stroke-width: 3;
      fill: white;
      }
  
      .axis path,
		.axis line {
			fill: none;
			stroke: black;
			stroke-width: 2;
      shape-rendering: crispEdges;
		}
		
		.axis text {
         font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
         font-size: 18px;
         font-style: bold;
		}
      
      
    g.lines.highlight {
			opacity: 0.95;
  	}

g.lines.highlight circle {
	    fill: #ff0000;
      stroke: #ff0000;
		}

g.lines.highlight line {
	    stroke: #ff0000;
		}  
    
    #option {
			margin: 10px;
			}
      
    </style>
  </head>

<h1>Slope Chart</h1>
		
<div id="option">
    <input name="updateButton" 
                 type="button" 
                value="Update" 
                onclick="updateData()" />
</div>
       
       
  <div class="chartContainer" id="slopeChartContainer">
   	</div>
	
    </div> 
    
    <script>
     
      
      
      
      //Width, height, padding
	var w = 400;
	var h = 600;
	var padding = 40;
		
		 //data
  var dataset = [{"first":3.1,"second":5,"group":"up","delta":-1.9,"firstpct":0.1476,"secondpct":0.2381},{"first":5.3,"second":6,"group":"up","delta":-0.7,"firstpct":0.3533,"secondpct":0.4},{"first":1.7,"second":3.2,"group":"up","delta":-1.5,"firstpct":0.0944,"secondpct":0.1778},{"first":3.3,"second":7.3,"group":"up","delta":-4,"firstpct":0.1833,"secondpct":0.4056},{"first":2.4,"second":5.4,"group":"up","delta":-3,"firstpct":0.1043,"secondpct":0.2348},{"first":3.6,"second":8.5,"group":"up","delta":-4.9,"firstpct":0.2118,"secondpct":0.5},{"first":4.3,"second":9.1,"group":"up","delta":-4.8,"firstpct":0.1955,"secondpct":0.4136},{"first":1.1,"second":11.1,"group":"up","delta":-10,"firstpct":0.0458,"secondpct":0.4625},{"first":5.2,"second":15.7,"group":"up","delta":-10.5,"firstpct":0.208,"secondpct":0.628},{"first":4.9,"second":4.5,"group":"down","delta":0.4,"firstpct":0.3267,"secondpct":0.3},{"first":7,"second":2.6,"group":"down","delta":4.4,"firstpct":0.3043,"secondpct":0.113},{"first":3,"second":1.2,"group":"down","delta":1.8,"firstpct":0.1667,"secondpct":0.0667}]   ;

//Set button state     
//Default action for button will be to plot by Frequency

//Get values for plotting
var mydataset = []; // store their names within a local array

for(var i = 0; i < dataset.length; i++){
      mydataset.push(
        [dataset[i].first, dataset[i].second, dataset[i].delta]
       )        
       }

//Find max values & Create scale functions
      var xMax = d3.max(mydataset, function(d) { return d[0]; })
      var yMax = d3.max(mydataset, function(d) { return d[1]; })
      var max = Math.max(yMax, xMax);  // highest value in dataset
   
			var yScale = d3.scale.linear()
								 .domain([0, max])
								 .range([h - padding, padding])
                 .nice() 
                 ;
   
      var rad = 6 // radius of circle 
      var radback = rad * 1.3
  
//Configure y axis 
		var yAxis = d3.svg.axis()
						.scale(yScale)
						.orient("left")
						.ticks(6)
            ; 
      
      
//Create SVG element
			var svg = d3.select("#slopeChartContainer")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

//Create groups
		var groups = svg.selectAll("g")
						.data(mydataset)  // bind data to the group
						.enter()
						.append("g")
						.attr("class", "lines") // give each 'g' a bar class
						
   // .attr("transform", function(d, i) {return "translate(" + yScale(i) + ",0)";})

.on("mouseover", function(d) {d3.select(this).classed("highlight", true);})
		.on("mouseout", function() {d3.select(this).classed("highlight", false);});
      
      
       
 // join paths
  groups.append("line")
			   .attr("x1", (w/4))
         .attr("x2", (w/1.4))
         .attr("y1", function(d) {return yScale(d[0])})
         .attr("y2", function(d) {return yScale(d[1])})
         .style("stroke-width", 4)        
         .attr("stroke",  function(d) {
               if (d[2] <= -10) {return "#000c60";}
                else if (d[2] >=0) {return "#569ffe";} 
                else  {return "#001bea";}
                 })
         .style("opacity", 1)
          ;

//Create first background circles
			groups.append("circle")
         .attr("class", "circles1b")
         .attr("r", radback)
         .attr("cx", (w/4))
         .attr("cy", function(d) {return yScale(d[0])})
          ;      
      
  //Create first circles
	groups.append("circle")
			   .attr("class", "circle1")
         .attr("r", rad)
         .attr("cx", (w/4))
         .attr("cy", function(d) {return yScale(d[0])})
         .attr("stroke",  function(d) {
               if (d[2] <= -10) {return "#000c60";}
                else if (d[2] >=0) {return "#569ffe";} 
                else  {return "#001bea";}
                 })
      .style("opacity", 1)      
          ;
  
//Create second background circles
			groups.append("circle")
         .attr("class", "circles2b")
        .attr("r", radback)
         .attr("cx", (w/1.4))
         .attr("cy", function(d) {return yScale(d[1])})
          ;      
      
      
    
  //Create second circles
   groups.append("circle")
			   .attr("class", "circle2")
         .attr("r", rad) 
         .attr("cx", (w/1.4))
         .attr("cy", function(d) {return yScale(d[1])})
         .attr("stroke",  function(d) {
               if (d[2] <= -10) {return "#000c60";}
                else if (d[2] >=0) {return "#569ffe";} 
                else  {return "#001bea";}
                 })
      .style("opacity", 1) 
          ;    
      
  // First text
       svg.append("text")
          .attr("x", (w/4))
          .attr("y", h-(padding/2))
          .style("text-anchor","middle") 
          .text("First");

// Second text
       svg.append("text")
          .attr("x", (w/1.4))
          .attr("y", h-(padding/2))
         .style("text-anchor","middle") 
          .text("Second");
  
  
  //Create y axis
		svg.append("g")
			.attr("class", "axis")
			.attr("transform", "translate(" + (padding*1.5) + ",0)")
			.call(yAxis);
  
    
 // Add the text label for the Y axis
    svg.append("text")
        .attr("class", "ytext")
        .attr("transform", "rotate(-90)")
        .attr("y", (padding/100))
        .attr("x",0 - (h / 2))
        .attr("dy", "1em")
        .style("text-anchor", "middle")
        .text("Arbitrary Units");
   
      
 
      
      
function updateData() {
   
   //update data
var mydataset = [];       
for(var i = 0; i < dataset.length; i++){
      mydataset.push(
        [dataset[i].firstpct*100, dataset[i].secondpct*100, dataset[i].delta]
       )        
       }  
        
      var xMax = d3.max(mydataset, function(d) { return d[0]; })
      var yMax = d3.max(mydataset, function(d) { return d[1]; })
      var max = Math.max(yMax, xMax);  // highest value in dataset

var yScale = d3.scale.linear()
								 .domain([0, max])
								 .range([h - padding, padding])
                 .nice() 
                 ;
        
        
  //Update Y axis   
var yAxis = d3.svg.axis()
							  .scale(yScale)
							  .orient("left")
							  .ticks(5); 
    
    svg.select("g.axis")
						.transition()
						.duration(2000)
      .attr("class", "axis")
			.attr("transform", "translate(" + (padding*1.5) + ",0)")
			.call(yAxis);  			
         
    svg.selectAll("text.ytext").remove();
    
    svg.append("text")
        .transition()
        .duration(2000)
        .attr("transform", "rotate(-90)")
        .attr("y", (padding/100))
        .attr("x",0 - (h / 2))
        .attr("dy", "1em")
        .style("text-anchor", "middle")
        .text("Percentage");

//Set-up Transition
   
 var groups = svg.selectAll("g")
	    					.data(mydataset)  // bind data to the group
			    			.transition()
                .duration(2000);
   
 // update join paths
  groups.select("line")
			   .attr("y1", function(d) {return yScale(d[0])})
         .attr("y2", function(d) {return yScale(d[1])})
          ;  
  //update first background circles
	groups.select(".circles1b")
         .attr("cy", function(d) {return yScale(d[0])})
          ;      
 
  //update first circles
	groups.select(".circle1")
			   .attr("cy", function(d) {return yScale(d[0])})
          ;

//update second background circles
	groups.select(".circles2b")
         .attr("cy", function(d) {return yScale(d[1])})
          ;      
       
  //update second circles
   groups.select(".circle2")
         .attr("cy", function(d) {return yScale(d[1])})
         ;  
      
 }
      
    </script>
  </body>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js