Another hex map / Fil | Observable

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Edited

Dec 1, 2023

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Another hex map

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geoContainsCache = function(land) {

var w = 5000,

h = 5000,

projection = d3.geoAzimuthalEqualArea().fitSize([w, h], { type: "Sphere" }),

canvas = document.createElement("canvas"),

context = canvas.getContext("2d"),

path = d3.geoPath(projection, context);

canvas.width = w;

canvas.height = h;

context.fillStyle = "white";

context.fillRect(0, 0, w, h);

context.fillStyle = "black";

context.beginPath(), path(land), context.fill();

var c = context.getImageData(0, 0, w, h).data;

canvas = context = path = null; // free up memory

return function(point) {

point = projection(point);

return c[4 * (Math.floor(point[0]) + Math.floor(point[1]) * w)] < 128;

};

}

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