D3.js area() Method

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The d3.area() method in D3.js is used to return an area generator with default settings that can be further used to create areas.

Syntax:

d3.area()

Parameters: This method does not accept parameters.

Return Value: This method returns no value.

Below examples illustrate the d3.area() method in D3.js:

Example 1:

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src="https://d3js.org/d3.v4.min.js"> 
    </script> 
</head> 
  
<body> 
    <h1 style="text-align: center; 
             color: green;"> 
        zambiatek 
    </h1> 
  
    <center> 
        <svg id="gfg" width="200" height="200"> 
        </svg> 
    </center> 
      
    <script> 
        var data = [ 
            { x: 0, y: 10 }, 
            { x: 10, y: 30 }, 
            { x: 20, y: 150 }, 
            { x: 50, y: 10 }, 
            { x: 60, y: 150 }, 
            { x: 70, y: 50 }, 
            { x: 80, y: 190 }]; 
  
        data.sort((a, b) => a.y - b.y); 
  
        var xScale = d3.scaleLinear() 
            .domain([0, 8]) 
            .range([25, 200]); 
        var yScale = d3.scaleLinear() 
            .domain([0, 20]) 
            .range([200, 25]); 
  
        // Using area() function to 
        // generate area 
        var Gen = d3.area() 
            .x((p) => p.x) 
            .y0((p) => 0) 
            .y1((p) => p.y); 
  
        d3.select("#gfg") 
            .append("path") 
            .attr("d", Gen(data)) 
            .attr("fill", "green") 
            .attr("stroke", "black"); 
    </script> 
</body> 
  
</html> 

Output:

Example 2:

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src="https://d3js.org/d3.v4.min.js"> 
    </script> 
</head> 
  
<body> 
    <h1 style="text-align: center;  
             color: green;"> 
        zambiatek 
    </h1> 
  
    <center> 
        <svg id="gfg" width="250" height="200"> 
        </svg> 
    </center> 
      
    <script> 
        var points = [ 
            { xpoint: 25, ypoint: 150 }, 
            { xpoint: 75, ypoint: 50 }, 
            { xpoint: 100, ypoint: 150 }, 
            { xpoint: 100, ypoint: 50 }, 
            { xpoint: 200, ypoint: 150 }]; 
  
        // Using area() function to generate area 
        var Gen = d3.area() 
            .x((p) => p.xpoint) 
            .y0((p) => 0) 
            .y1((p) => p.ypoint); 
  
        d3.select("#gfg") 
            .append("path") 
            .attr("d", Gen(points)) 
            .attr("fill", "green") 
            .attr("stroke", "black"); 
  
    </script> 
</body> 
  
</html> 

Output:

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