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d3.js geoCylindricalStereographic()用法及代碼示例


D3.js是一個JavaScript庫,用於在Web瀏覽器中生成動態的交互式數據可視化。它利用可伸縮矢量圖形,HTML5和級聯樣式表標準。
d3.js中的CylindricalEqualArea()函數用於繪製圓柱體立體投影。

用法:

d3.geoCylindricalStereographic()

參數:此方法不接受任何參數。

返回值:此方法根據給定的json數據創建CylindricalStereographic投影。

範例1:以下示例繪製以(0,0)為中心且旋轉為0的世界的CylindricalStereographic投影。



<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" content="width=device-width,  
                initial-scale=1.0" /> 
</head> 
  
<body> 
    <div style="width:700px; height:500px;"> 
        <center> 
            <h3 style="color:black"> 
            </h3> 
        </center> 
        <svg width="600" height="450"> 
        </svg> 
    </div> 
    <script src="https://d3js.org/d3.v4.js"></script> 
    <script src= 
    "https://d3js.org/d3-geo-projection.v2.min.js"> 
    </script> 
    <script> 
  
        var svg = d3.select("svg"), 
            width = +svg.attr("width"), 
            height = +svg.attr("height"); 
  
        // CylindricalStereographic projection 
        // Center(0, 0) with 0 rotation 
        var gfg = d3.geoCylindricalStereographic() 
            .scale(width / 2.0 / 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:

沒有旋轉且以(0,0)為中心的世界的圓柱立體投影

例子2:以下示例在更改中心和旋轉後繪製了世界的CylindricalStereographic投影。

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" content="width=device-width,  
                initial-scale=1.0" /> 
</head> 
  
<body> 
    <div style="width:700px; height:600px;"> 
        <center> 
            <h3 style="color:black"> 
            </h3> 
        </center> 
        <svg width="500" height="450"> 
        </svg> 
    </div> 
    <script src="https://d3js.org/d3.v4.js"></script> 
    <script src= 
    "https://d3js.org/d3-geo-projection.v2.min.js"> 
    </script> 
    <script> 
  
        var svg = d3.select("svg"), 
            width = +svg.attr("width"), 
            height = +svg.attr("height"); 
  
        // CylindricalStereographic  projection 
        // Center(0, 20) and 45 degree rotation w.r.t Y axis 
        var gfg = d3.geoCylindricalStereographic() 
            .scale(width / 2.0 / Math.PI) 
            .rotate([45, 0]) 
            .center([0, 20]) 
            .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:

yy軸旋轉45度並以(0,20)為中心的CylindricalEqualArea投影




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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 geoCylindricalStereographic() 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。