d3.js zoom.translateExtent()用法及代码示例

D3.js中的zoom.translateExtent()函数用于将转换范围设置为指定的点数组[[左上角，右下角]]，并返回此缩放行为。

用法:

zoom.translateExtent([extent])

参数：该函数接受如上所述和以下描述的单个参数

extent:此参数用于将车轮增量函数设置为指定函数。

返回值：此函数返回缩放行为。

以下示例程序旨在说明D3.js中的zoom.translateExtent()函数

范例1：

<!DOCTYPE html>  
<html>  
<head>  
    <meta charset="utf-8"> 
        
    <script src= 
            "https://d3js.org/d3.v4.min.js">  
    </script> 
       
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"> 
    </script> 
</head>  
      
<body>  
    <center> 
        <h1 style="color:green;">  
            Geeksforgeeks  
        </h1>  
        
        <h3> 
  D3.js | zoom.translateExtent() Function 
      </h3> 
          
        <div id="GFG"></div> 
          
        <script> 
            var height = 300; 
            var width = 300; 
              
            var zoom = d3.zoom() 
               .translateExtent([[0, 0], [300, 300]]) 
                .on("zoom", zoomed); 
              
            var svg = d3.select("#GFG") 
                    .append("svg") 
                    .attr("width", height) 
                    .attr("height", width) 
                    .append("g") 
                      
            svg.append("rect") 
                    .attr("x", 0) 
                    .attr("y", 0) 
                    .attr("height", 200) 
                    .attr("width", 400) 
                    .style("fill", "green"); 
                         
                var circle = svg.append("circle") 
                    .attr("cx", 100) 
                    .attr("cy", 100) 
                    .attr("r", 20) 
                    .style("fill", "red") 
                      
                svg.call(zoom); 
                  
                function zoomed() { 
                  circle.attr( 
                    "transform", d3.event.transform); 
                } 
        </script>  
    </center> 
</body>  
    
</html>

输出：

范例2：

<!DOCTYPE html> 
<html> 
    <head> 
        <meta charset="utf-8" /> 
  
        <script src= 
            "https://d3js.org/d3.v4.min.js"> 
      </script> 
  
        <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"> 
      </script> 
  
        <style> 
            #svg { 
                background-color:rgb(149, 160, 230); 
            } 
            #shape { 
                fill:rgb(232, 7, 228); 
                stroke:white; 
                stroke-width:3px; 
            } 
            #shape:hover { 
                fill:rgb(13, 214, 30); 
            } 
        </style> 
    </head> 
  
    <body> 
        <center> 
            <h1 style="color:green;"> 
                Geeksforgeeks 
            </h1> 
  
            <h3>D3.js | zoom.translateExtent() Function</h3> 
  
            <div id="GFG"></div> 
  
            <script> 
                var width = 300, 
                    height = 200; 
  
                var container = 
                    d3.select("#GFG").append("div"); 
  
                var svg =  
                    container.append( 
                      "svg").attr( 
                      "id", "svg").attr( 
                      "width", width).attr( 
                      "height", height); 
  
                var group = svg.append("g"); 
  
                var shape = group.append( 
                  "rect").attr( 
                  "id", "shape").attr( 
                  "width", 150).attr( 
                  "height", 100).attr( 
                  "x", 75).attr("y", 50); 
  
                zoom = d3 
                    .zoom() 
                    .scaleExtent([1, 3]) 
                    .translateExtent([ 
                        [0, 0], 
                        [width, height], 
                    ]) 
                    .on("zoom", zoomed); 
  
                svg.call(zoom); 
  
                function zoomed() { 
                    change = d3.event.transform; 
                    console.log(change); 
                    group.attr("transform", "translate(" + 
                    [change.x, change.y] + ")scale(" +  
                    change.k + ")"); 
                    group.select("#shape").style( 
                        "stroke-width", 3 / change.k + "px"); 
                } 
            </script> 
        </center> 
    </body> 
</html>

输出：

相关用法

注：本文由纯净天空筛选整理自SHUBHAMSINGH10大神的英文原创作品 D3.js zoom.translateExtent() 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。