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d3.js geoSinusoidal()用法及代码示例


JavaScript D3.js库使用HTML5,可缩放矢量图形和级联样式表为网页提供交互式数据可视化。 d3.js中的geoSinusoidal()函数用于绘制正弦投影。

用法:

d3.geoSinusoidal()

Parameters :此方法不接受任何参数。

Returns :此方法根据给定的JSON数据创建正弦投影。

范例1:以下示例创建以(0,0)为中心且不旋转的世界的正弦投影。



HTML

<!DOCTYPE html>  
<html lang="en">  
  
<head>  
    <meta charset="UTF-8" />  
    <meta name="viewport"
        content="width=device-width,  
                initial-scale=1.0"/>  
    <script src="https://d3js.org/d3.v4.js"></script> 
    <script src= 
"https://d3js.org/d3-geo-projection.v2.min.js"> 
    </script> 
</head>  
  
<body>  
    <div style="width:700px; height:500px;">  
        <center>  
            <h3 style="color:black">  
            </h3>   
        </center> 
        <svg width="600" height="450"> </svg>  
    </div>  
  
    <script> 
  
      var svg = d3.select("svg"), 
      width = +svg.attr("width"), 
      height = +svg.attr("height"); 
  
     // Sinusoidal projection 
     // Center(0,0) with 0 rotation 
     var gfg = d3.geoSinusoidal() 
              .scale(width / 1.8 / Math.PI) 
              .rotate([0,0]) 
              .center([0,0]) 
              .translate([width / 2, height / 2]) 
  
     // Loading the json data 
     // Used json file stored at  
     // https://raw.githubusercontent.com/janasayantan 
     // /datageojson/master/world.json 
     d3.json("https://raw.githubusercontent.com/" 
     + "janasayantan/datageojson/master/world.json",  
     function(data){ 
  
         // Drawing the map 
         svg.append("g") 
         .selectAll("path") 
         .data(data.features) 
         .enter().append("path") 
            .attr("fill", "Black") 
            .attr("d", d3.geoPath() 
            .projection(gfg) 
            ) 
            .style("stroke", "#ffff") 
        }) 
   </script> 
</body>  
  
</html>

输出:

范例2:在下面的示例中,我们将创建以(-10,0)为中心并且相对于Y轴旋转90度的世界的正弦投影。

HTML

<!DOCTYPE html>  
<html lang="en">  
  
<head>  
    <meta charset="UTF-8" />  
    <meta name="viewport"
        content="width=device-width,  
                initial-scale=1.0"/>  
    <script src="https://d3js.org/d3.v4.js"></script> 
    <script src= 
"https://d3js.org/d3-geo-projection.v2.min.js"> 
    </script> 
</head>  
  
<body>  
    <div style="width:700px; height:600px;">  
        <center>  
            <h3 style="color:black"></h3>   
       </center> 
       <svg width="500" height="450"> </svg>  
    </div>  
  
    <script> 
  
       var svg = d3.select("svg"), 
       width = +svg.attr("width"), 
       height = +svg.attr("height"); 
  
      // Sinusoidal  projection 
      // Center(-10,0) and 90 degree 
      // rotation w.r.t Y axis 
      var gfg = d3.geoSinusoidal() 
               .scale(width / 1.8 / Math.PI) 
               .rotate([90,0]) 
               .center([-10,0]) 
               .translate([width / 2, height / 2]) 
  
     // Loading the json data 
     // Used json file stored at  
     // https://raw.githubusercontent.com/janasayantan 
     // /datageojson/master/world.json 
     d3.json("https://raw.githubusercontent.com/" 
     + "janasayantan/datageojson/master/world.json",  
     function(data){ 
  
         // Draw the map 
         svg.append("g") 
            .selectAll("path") 
            .data(data.features) 
            .enter().append("path") 
            .attr("fill", "grey") 
            .attr("d", d3.geoPath() 
            .projection(gfg) 
            ) 
            .style("stroke", "#ffff") 
         }) 
    </script> 
</body>  
  
</html>

输出:




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注:本文由纯净天空筛选整理自jana_sayantan大神的英文原创作品 D3.js geoSinusoidal() 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。