D3.js density.x() Function

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The density.x() function is used to set the x-coordinate accessor. If the x is not specified then this function returns the current x-coordinate accessor.

Syntax:

d3.contourDensity.x([x]);

Parameters: This function takes one parameter as given above and described below:

x: It is the value for the x-coordinate accessor.

Return Value: This function returns a number.

Below given are a few examples of the density.x() function.

Example 1:

<!DOCTYPE html>  
<html lang="en">  
  
<head>  
    <meta charset="UTF-8">  
    <meta name="viewport" content="  
        width=device-width, initial-scale=1.0">  
  
    <script type="text/javascript"
        src="https://d3js.org/d3.v4.min.js">  
    </script>  
    <script src= 
"https://d3js.org/d3-contour.v1.min.js"> 
     </script> 
</head>  
  
<body>  
    <h1 style="color:green">zambiatek</h1> 
      
    <script>  
  
        // Append the svg object to the body. 
        var svg = d3.select("body") 
        .append("svg") 
            .attr("width", 530) 
            .attr("height", 480) 
        .append("g") 
            .attr("transform", 
                "translate(" + 40 + ", " + 0 + ")"); 
  
        // Read data 
        d3.csv("./data.csv", function(data) { 
              
        var y = d3.scaleLinear() 
            .domain([5, 30]) 
            .range([ 450, 10 ]); 
  
        var x = d3.scaleLinear() 
            .domain([5, 22]) 
            .range([ 0, 460]); 
  
  
        svg.append("g") 
        .call(d3.axisLeft(y)); 
          
        svg.append("g") 
            .attr("transform",  
                  "translate(0, " + 450 + ")") 
            .call(d3.axisBottom(x)); 
  
        var density= d3.contourDensity() 
            .y(function(d) { return y(d.y); }) 
            .bandwidth(25) 
  
            // Use of  density.x() function 
            .x(function(d) { return x(d.x); })(data) 
  
        svg.selectAll("path") 
            .data(density) 
            .enter() 
            .append("path") 
            .attr("d", d3.geoPath()) 
            .attr("fill", "none") 
            .attr("stroke", "green") 
        }); 
  
        // Data for csv file 
        // x, y, group 
        // 9.45, 14.14, H 
        // 9.1, 14.14, H 
        // 9.9, 9.9, H 
        // 9.6, 14.5, H 
        // 9.1, 9.7, H 
        // 14.7, 9.5, H 
        // 7.9, 9.6, H 
        // 14.7, 9.7, H 
        // 9.45, 14.14, H 
        // 12.1, 9.14, H 
        // 7.5, 9, H 
        // 14.5, 14.5, H 
        // 9.45, 9.7, H 
        // 14.45, 9.6, H 
        // 9.5, 7.6, H 
        // 9, 9.45, H 
        // 14.7, 12, H 
        // 9.7, 9.7, H 
        // 9.6, 9, H 
        // 12, 9, H 
        // 9.45, 14.5, H 
        // 9.9, 14.6, H 
        // 12.7, 9.9, H 
        // 9, 12.14, H 
        // 9, 14.9, H 
        // 9.5, 9.7, H 
        // 9.7, 14.7, H 
        // 9.9, 14.5, H 
        // 14, 14.5, H 
        // 7.9, 9, H 
        // 9.9, 9.45, H 
        // 9, 14.14, H 
        // 14.7, 9.7, H 
        // 14.5, 9.9, H 
    </script>  
</body>  
  
</html>  

Output:

Example 2:

<!DOCTYPE html>  
<html lang="en">  
  
<head>  
    <meta charset="UTF-8">  
    <meta name="viewport" content="  
        width=device-width, initial-scale=1.0">  
  
    <script type="text/javascript"
        src="https://d3js.org/d3.v4.min.js">  
    </script>  
    <script src= 
"https://d3js.org/d3-contour.v1.min.js"> 
      </script> 
</head>  
  
<body>  
    <h1 style="color:green">zambiatek</h1> 
      
    <script>  
  
        // Append the svg object to the body. 
        var svg = d3.select("body") 
        .append("svg") 
            .attr("width", 530) 
            .attr("height", 480) 
        .append("g") 
            .attr("transform", 
                "translate(" + 40 + ", " + 0 + ")"); 
  
        // Read data 
        d3.csv("./data.csv", function(data) { 
              
        var y = d3.scaleLinear() 
            .domain([5, 30]) 
            .range([ 450, 10 ]); 
  
        var x = d3.scaleLinear() 
            .domain([5, 22]) 
            .range([ 0, 460]); 
  
  
        svg.append("g") 
        .call(d3.axisLeft(y)); 
          
        svg.append("g") 
            .attr("transform", "translate(0, " + 450 + ")") 
            .call(d3.axisBottom(x)); 
  
        var density= d3.contourDensity() 
            .y(function(d) { return y(d.y); }) 
            .bandwidth(25) 
  
            // Use of  density.x() function 
            .x(function(d) { return x(d.x); })(data) 
  
        svg.selectAll("path") 
            .data(density) 
            .enter() 
            .append("path") 
            .attr("d", d3.geoPath()) 
            .attr("fill", "green") 
        }); 
  
        // Data for csv file 
        // x, y, group 
        // 9.45, 14.14, H 
        // 9.1, 14.14, H 
        // 9.9, 9.9, H 
        // 9.6, 14.5, H 
        // 9.1, 9.7, H 
        // 14.7, 9.5, H 
        // 7.9, 9.6, H 
        // 14.7, 9.7, H 
        // 9.45, 14.14, H 
        // 12.1, 9.14, H 
        // 7.5, 9, H 
        // 14.5, 14.5, H 
        // 9.45, 9.7, H 
        // 14.45, 9.6, H 
        // 9.5, 7.6, H 
        // 9, 9.45, H 
        // 14.7, 12, H 
        // 9.7, 9.7, H 
        // 9.6, 9, H 
        // 12, 9, H 
        // 9.45, 14.5, H 
        // 9.9, 14.6, H 
        // 12.7, 9.9, H 
        // 9, 12.14, H 
        // 9, 14.9, H 
        // 9.5, 9.7, H 
        // 9.7, 14.7, H 
        // 9.9, 14.5, H 
        // 14, 14.5, H 
        // 7.9, 9, H 
        // 9.9, 9.45, H 
        // 9, 14.14, H 
        // 14.7, 9.7, H 
        // 14.5, 9.9, H 
    </script>  
</body>  
  
</html>  

Output:

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