D3.js geoAugust()函数

d3.js中的geoAugust ()函数用于绘制给定geojson数据的August外摆线等角投影。

句法：

d3.geoAugust()

参数：此方法不接受任何参数。

返回：此方法返回 August 的外摆线保角投影。

示例 1：以下示例绘制了 8 月的亚洲外摆线等角投影。

HTML

  

    
    
    
    

  

    
        
            
                August Projection of Asia
            
        
        
        
    
    
        var svg = d3.select("svg"),
            width = +svg.attr("width"),
            height = +svg.attr("height");
  
        // August projection
        var gfg = d3.geoAugust()
            .scale(width / 1.5 / Math.PI)
            .translate([width / 2, height / 2]);
  
        // Loading the geojson data 
        d3.json("https://raw.githubusercontent.com/" +
            "janasayantan/datageojson/master/" +
            "geoasia.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：

示例 2：以下示例绘制了 August 的世界外摆线等角投影。

HTML

  

    
    
    
    

  

    
        
            
                August Projection of World
            
        
        
        
    
    
        var svg = d3.select("svg"),
            width = +svg.attr("width"),
            height = +svg.attr("height");
  
        // August projection
        var gfg = d3.geoAugust()
            .scale(width / 1.5 / Math.PI)
            .translate([width / 2, height / 2]);
  
        // Loading the json data
        d3.json("https://raw.githubusercontent.com/" +
            "janasayantan/datageojson/master/" +
            "geoworld%20.json",
            function (data) {
  
                // Draw 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")
            });
    

  

输出：