The transform.toString() Function in D3.js is used to get a string representing the SVG transform corresponding to this transform.
Syntax:
transform.toString()
Parameters: This function does not accept any parameter.
Return Value: This function returns a string value that can be used to set zoom behavior.
Below programs illustrate the transform.toString() function in D3.js.
Example 1:
HTML
<!DOCTYPE html> <html> <head>     <meta charset="utf-8">       <script src=     </script>   </head>       <body>     <center>         <h1 style="color: green;">             Geeksforneveropen         </h1>                 <h3>D3.js | transform.toString() Function</h3>                     <svg width="400" height="250"></svg>                     <script>             var svg = d3.select("svg"),                 width = +svg.attr("width"),                 height = +svg.attr("height");                                var radius = 30;                var circle = {x: 200, y: height /2 } ;                                var circle = svg.append("circle")                 .attr("cx", circle.x)                 .attr("cy", circle.y)                 .attr("r", radius)                 .attr("fill", "green");                                // Defining zoom behaviour             var zoom_handler = d3.zoom()                 .on("zoom", zoom_actions);                            zoom_handler(circle);                            function zoom_actions(){                 var transform = d3.event.transform;                   // Setting attribute using this method                 this.setAttribute("transform",                            transform.toString());             }            </script>     </center> </body>     </html> |
Output:
Example 2:
HTML
<!DOCTYPE html> <html>   <head>     <meta charset="utf-8">             <script src=     </script>             <style>         circle {           opacity: 0.7;           fill: #9a05a3;         }     </style> </head>       <body>     <center>         <h1 style="color: green;">             Geeksforneveropen         </h1>                 <h3>D3.js | transform.toString() Function</h3>                     <svg></svg>                     <script>             var transform = d3.zoomIdentity                 .translate(100, 0).scale(1);               var zoom = d3.zoom().on("zoom", handleZoom);                               var svg = d3.select("svg")               .attr('width', 300)               .attr('height', 250)               .style("background", "#31c460")               .call(zoom)                                    .call(zoom.transform, transform);                         var zoomable = svg               .append("g")               .attr("class", "zoomable")               .attr("transform", transform);                                 var circles = zoomable.append('circle')               .attr("id", "circles")               .attr("cx", 50)               .attr("cy", 125)               .attr('r', 30);                         function handleZoom(){               if (zoomable) {                 // Setting attribute using this method                 zoomable.attr("transform",                     d3.event.transform.toString());               }             };         </script>     </center> </body>     </html> |
Output:
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