d3.js geoSinusoidal()用法及代碼示例

JavaScript D3.js庫使用HTML5，可縮放矢量圖形和級聯樣式表為網頁提供交互式數據可視化。 d3.js中的geoSinusoidal()函數用於繪製正弦投影。

用法：

d3.geoSinusoidal()

Parameters ：此方法不接受任何參數。

Returns ：此方法根據給定的JSON數據創建正弦投影。

範例1：以下示例創建以(0，0)為中心且不旋轉的世界的正弦投影。

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>

輸出：

範例2：在下麵的示例中，我們將創建以(-10，0)為中心並且相對於Y軸旋轉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>

輸出：

相關用法

注：本文由純淨天空篩選整理自jana_sayantan大神的英文原創作品 D3.js geoSinusoidal() Function。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。