D3.js zoom() Function - GeeksforGeeks

09 Sep, 2020
The d3.zoom() Function in D3.js is used to create a new zoom behaviour. It is used to apply the zoom transformation on a selected element.
Syntax:
d3.zoom();
Parameters: This function does not accept any parameter.
Return Value: This function returns the zoom behaviour.
Below programs illustrate the d3.zoom() function in D3.js
Example 1: This example, Zooming and panning is done. Double click to zoom, the circle gets bigger.
<!DOCTYPE html> <html> <head>     <meta charset="utf-8">    <script src="https://d3js.org/d3.v4.min.js">    </script>   </head>  <body>     <center>        <h1 style="color: green;">             Geeksforgeeks         </h1>               <h3>D3.js | d3.zoom() Function</h3>                  <div id="GFG"></div>                  <script>            var svg = d3.select("#GFG")              .append("svg")                .attr("width", 300)                .attr("height", 300)                .call(d3.zoom().on("zoom", function () {                   svg.attr("transform", d3.event.transform)                }))              .append("g")                          svg              .append("circle")                .attr("cx", 150)                .attr("cy", 150)                .attr("r", 40)                .style("fill", "green")                      </script>     </center></body> </html> 
Output:
Example 2:
<!DOCTYPE html> <html> <head>     <meta charset="utf-8">    <script src="https://d3js.org/d3.v4.min.js">     </script>    <style>        svg text {              fill: green;              font: 20px sans-serif;              text-anchor: center;          }                    rect {          pointer-events: all;        }    </style></head> <body>     <center>        <h1 style="color: green;">             Geeksforgeeks         </h1>               <h3>D3.js | d3.zoom() Function </h3>                  <svg></svg>                  <script>            var width = 400;            var height = 200;                          var svg = d3.select("svg")              .attr("width", width)              .attr("height", height);                            // The scale used to display the axis.            var scale = d3.scaleLinear()              .range([10, width-20])              .domain([0, 100]);                           var shadowScale = scale.copy();                          var axis = d3.axisBottom()              .scale(scale);                            var g = svg.append("g")              .attr("transform", "translate(0, 50)")              .call(axis);                            // Standard zoom behavior:            var zoom = d3.zoom()              .scaleExtent([1, 10])              .translateExtent([[0, 0], [width, height]])              .on("zoom", zoomed);                           // Call the Zoom.            svg.call(zoom);        </script>     </center></body> </html>
Output:
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