D3.js geoKavrayskiy7()函数

d3.js 中的geoKavrayskiy7 ()函数用于从给定的 geojson 数据中绘制Kavrayskiy VII 伪圆柱投影。

句法：

d3.geoKavrayskiy7()

参数：此方法不接受任何参数。

返回：此方法返回 Kavrayskiy7 投影。

示例 1 ：以下示例绘制世界的 Kavrayskiy7 投影，中心在 (0, 0)，旋转 0 度。

HTML

  

    
    
    
    

  

    
        
            
        
        
        
    
  
    
        var svg = d3.select("svg"),
            width = +svg.attr("width"),
            height = +svg.attr("height");
  
        // Kavrayskiy7 projection with
        // the center at (0, 0) and rotation
        // of 0 degrees
        var gfg = d3.geoKavrayskiy7()
            .scale(width / 1.5 / Math.PI)
            .rotate([0, 0])
            .center([0, 0])
            .translate([width / 2, height / 2])
  
        // Loading the json data
        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", "SaddleBrown")
                    .attr("d", d3.geoPath()
                        .projection(gfg)
                    )
                    .style("stroke", "#ffff")
            });
    

  

输出：

示例 2：以下示例绘制世界的 Kavrayskiy7 投影，中心位于 (-10, 0) 并相对于 y 轴旋转 90 度。

HTML

  

    
    
    
    

  

    
        
            
        
        
        
    
  
    
        var svg = d3.select("svg"),
            width = +svg.attr("width"),
            height = +svg.attr("height");
  
        // Kavrayskiy7 projection with the
        // center at (0,0) and rotation of 
        // 90 degrees with respect to the y-axis
        var gfg = d3.geoKavrayskiy7()
            .scale(width / 1.8 / Math.PI)
            .rotate([90, 0])
            .center([-10, 0])
            .translate([width / 2, height / 2]);
  
        // Loading the json data
        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")
            });
    

  

输出：