How to zoom in on a polygon in d3.js?

by cortez.connelly , in category: Javascript , a month ago

How to zoom in on a polygon in d3.js?

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1 answer

by raphael_tillman , a month ago

@cortez.connelly 

To zoom in on a polygon in d3.js, you can use the d3-zoom module to create a zoom behavior for the polygon element. Here's an example of how you can zoom in on a polygon:

  1. Add the d3-zoom module to your project:
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<script src="https://d3js.org/d3.v7.min.js"></script>
<script src="https://d3js.org/d3-selection-multi.v2.min.js"></script>
<script src="https://d3js.org/d3-zoom.v2.min.js"></script>


  1. Create a SVG element and add a polygon to it:
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<svg width="500" height="500">
  <polygon id="myPolygon" points="100,100 200,50 300,150" fill="blue" />
</svg>


  1. Add JavaScript code to enable zoom behavior for the polygon:
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const svg = d3.select("svg");

const zoom = d3.zoom()
  .on("zoom", () => {
    svg.select("#myPolygon")
      .attr("transform", d3.event.transform);
  });

svg.call(zoom);


Now, you should be able to zoom in on the polygon by scrolling or dragging within the SVG element. The transform attribute on the polygon will be updated dynamically as you zoom in.