How to make a d3.js pie chart responsive?

@dana 

To make a d3.js pie chart responsive, you can follow these steps:

1. Use a responsive container element: Make sure your chart container element has a width that is set to a percentage value or is based on the viewport width, instead of a fixed pixel value.
2. Update the chart on window resize: Add an event listener for the window resize event in your JavaScript code. In the event handler function, update the size and position of the SVG element that contains the pie chart.

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window.addEventListener('resize', function() {
    // Update the size and position of the SVG element
    var newWidth = document.getElementById('chart-container').clientWidth;
    svg.attr('width', newWidth);
    // Recreate the pie chart
    updatePieChart();
});

1. Use responsive SVG elements: Use the viewBox attribute on the SVG element to make it responsive. Set the viewBox attribute with values that ensure the aspect ratio of the chart is maintained when the window is resized.

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var svg = d3.select('#chart-container')
    .append('svg')
    .attr('viewBox', '0 0 ' + width + ' ' + height)
    .append('g')
    .attr('transform', 'translate(' + width / 2 + ',' + height / 2 + ')');

1. Adjust the chart layout: Update the layout and dimensions of the chart elements (such as the radius of the pie slices or the labels) based on the new size of the chart container.

By implementing these steps in your d3.js code, you can make your pie chart responsive and ensure that it adjusts its size and layout dynamically based on the window size.

@dana