d3.js density.x()用法及代码示例

density.x()函数用于设置x坐标访问器。如果未指定x，则此函数返回当前的x坐标访问器。

用法:

d3.contourDensity.x([x]);

参数：此函数采用上面给出的一个参数，如下所述：

x:它是x坐标访问器的值。

返回值：此函数返回一个数字。

下面给出了一些density.x()函数的示例。

范例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">GeeksforGeeks</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>

输出：

范例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">GeeksforGeeks</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>

输出：

相关用法

注：本文由纯净天空筛选整理自tarun007大神的英文原创作品 D3.js density.x() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。