D3.js zoom.scaleExtent() Function

The zoom.scaleExtent() Function in D3.js is used to set the scale extends to the specified array of numbers [k0, k1]. The k0 is the minimum allowed scale factor and k1 is the maximum allowed scale factor

Syntax:

zoom.scaleExtent([extent])

Parameters: This function accepts a single parameter as mentioned above and described below

  • extent: This parameter can be defined as specified as a function which returns such an array.

Return Value: This function returns the zoom behaviour.

Below programs illustrate the zoom.scaleExtent() function in D3.js



Example 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

<!DOCTYPE html> 
<html
<head
    <meta charset="utf-8">
       
    <script src="https://d3js.org/d3.v4.min.js"
    </script>
      
    <script src=
    </script>
      
</head
     
<body
    <center>
        <h1 style="color: green;"
            Geeksforgeeks 
        </h1
       
        <h3>D3.js | zoom.scaleExtent() Function</h3>
           
        <svg height="200px" width="400px">
          <g id="main" transform="translate(25, 25) scale(0.25)"></g>
        </svg>
           
        <script>
            var svg = d3.select("#main");
  
            svg.append(
"rect").attr({"x":0, "y":0, "height":100, "width":100, "fill":"red"})
            svg.append(
"rect").attr({"x":100, "y":100, "height":100, "width":100, "fill":"blue"})
            svg.append(
"rect").attr({"x":0, "y":100, "height":100, "width":100, "fill":"green"})
            svg.append(
"rect").attr({"x":100, "y":0, "height":100, "width":100, "fill":"purple"})
              
            var zoom = d3.behavior.zoom().on("zoom", function(){
              var t = d3.event.translate;
              var s = d3.event.scale;
                
              svg.attr(
"transform", "translate("+t[0]+", "+t[1]+") scale("+s+")")
                
            })
            .scaleExtent([1, 10]).scale(1).translate([0, 0])
              
            d3.select("svg").call(zoom)
              
            d3.selectAll("rect").on("mousedown", function(){
              var scale = Math.random()*3;
              var translate = [Math.random()*100, Math.random()*100]
              zoom.scale(scale);
              zoom.translate(translate);
                
              //new transition
              var T = svg.transition().duration(5000)
              zoom.event(T);
            })
        </script
    </center>
</body
   
</html>

chevron_right


Output:

Example 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

<!DOCTYPE html> 
<html
<head
    <meta charset="utf-8">
    <script src="https://d3js.org/d3.v5.js">
    </script>
       
    <style>
        circle {
            fill: green;
            opacity: 0.2;
            stroke: black;
            stroke-width: 1px;
        }
           
        svg {
            border: 1px solid;
            font: 13px sans-serif;
            text-anchor: middle;
        }
    </style>
       
</head
     
<body
    <center>
        <h1 style="color: green;"
            Geeksforgeeks 
        </h1
       
   <h3>D3.js | zoom.scaleExtent() Function</h3>
           
        <div id="gfg" 
             style="width: 400px;
             margin: auto">
        </div>
           
        <script>
            function zoom_filter(divId) {
                var width = 400, height=250, maxR=30;
               
                var svg = d3.select(divId)
                            .append('svg')
                            .attr('width', width)
                            .attr('height', height)
                var g = svg.append('g')
               
                // create 15 circles
                var numCircles = 55;
                var circles = [];
                for (var i = 0; i < numCircles; i++)
                    circles.push(
{'x': 1+Math.floor(Math.random() * width),
              'y': 1+Math.floor(Math.random() * height),
              'r': 1+Math.floor(Math.random() * maxR)});
               
                g.selectAll('circle')
                    .data(circles)
                    .enter()
                    .append('circle')
                    .attr('cx', function(d) { return d.x; })
                    .attr('cy', function(d) { return d.y; })
                    .attr('r', function(d) { return d.r; })
                    .classed('no-zoom', true)
               
                var zoom = d3.zoom()
                    .scaleExtent([1, 10])
                    .on('zoom', function(d) { g.attr(
'transform', d3.event.transform); });
               
                svg.call(zoom);
            }
        </script> 
           
        <script>
            zoom_filter('#gfg');
        </script>
    </center>
</body
   
</html

chevron_right


Output:

full-stack-img




My Personal Notes arrow_drop_up

Small things always make you to think big

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.


Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.