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D3.js zoom() Function

  • Last Updated : 09 Sep, 2020
Geek Week

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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