How to find if point is inside polygon in d3.js?

@dana 

To determine if a point is inside a polygon in d3.js, you can use the d3.polygonContains() function. Here is an example code snippet:

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// Define the polygon coordinates as an array of points
var polygon = [[0, 0], [100, 0], [100, 100], [0, 100]];

// Define the point coordinates
var point = [50, 50];

// Check if the point is inside the polygon
var isInside = d3.polygonContains(polygon, point);

// Output the result
console.log(isInside);

In this example, the polygon is defined as an array of points, and the point is defined as an array of coordinates. The d3.polygonContains() function checks if the point is inside the polygon and returns a boolean value indicating the result.

Make sure to include the d3 library in your HTML file before running this code.