The zoom.extent() Function in D3.js is used to set the viewport extent to the specified array of points [top-left corner, bottom-right corner].
Syntax:
zoom.extent([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.extent() function in D3.js
Example 1:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </script> </head> <body> <center> <h1 style="color: green;"> Geeksforneveropen </h1> <h3>D3.js | zoom.extent() Function</h3> <div id="GFG"></div> <script> var svg = d3.select("#GFG") .append("svg") .attr("width", 300) .attr("height", 200) .call(d3.zoom() .extent([[0, 0], [200, 200]]) .on("zoom", function () { svg.attr( "transform", d3.event.transform) })) .append("g") svg .append("circle") .attr("cx", 150) .attr("cy", 100) .attr("r", 40) .style("fill", "green") </script> </center> </body> </html> |
Output:
Example 2:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </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;"> Geeksforneveropen </h1> <h3>D3.js | zoom.extent() 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() .extent([[0, 0], [width, height]]) .on("zoom", zoomed); // Call the Zoom. var rect = svg.append("rect") .attr("width", width) .attr("height", height) .attr("fill", "none") .call(zoom); function zoomed() { var t = d3.event.transform; scale.domain(t.rescaleX(shadowScale).domain()); g.call(axis); } </script> </center> </body> </html> |
Output:
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