veltman/README.md

## README.md

      
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              README.md
            
          
    Point clustering with the constraint that points should only be clustered within borders.

Use supercluster to cluster the points within each boundary.
Use a force simulation to avoid collisions between points along the borders.


## four-corners.geo.json

      
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## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
    path {
        fill: #f4f4f4;
        stroke: #666;
        stroke-width: 1px;
    }

    circle {
        stroke: none;
    }

    text {
        fill: #444;
        font-size: 12px;
        font-family: sans-serif;
        text-anchor: middle;
    }
</style>

<body>
    <script src="//d3js.org/d3.v5.min.js"></script>
    <script src="https://unpkg.com/supercluster@4.1.1/dist/supercluster.min.js"></script>
    <script>
        const width = 480,
            height = 500;

        const color = d3
            .scaleOrdinal()
            .range(["#ef9a9a", "#9fa8da", "#ffe082", "#80cbc4"]);

        const projection = d3.geoMercator();

        const path = d3.geoPath().projection(projection);

        const svg = d3
            .select("body")
            .append("svg")
            .attr("width", width * 2)
            .attr("height", height);

        Promise.all([
            d3.json("four-corners.geo.json"),
            d3.json("random-points.geo.json")
        ]).then(([states, points]) => {
            projection.fitExtent([[10, 10], [width - 10, height - 10]], states);

            const left = svg.append("g");
            const right = svg.append("g").attr("transform", "translate(" + width + ")");

            // Draw background
            [left, right].forEach(g =>
                g
                    .selectAll("path")
                    .data(states.features)
                    .enter()
                    .append("path")
                    .attr("d", path)
            );

            // Original points on left
            left
                .selectAll("circle")
                .data(points.features)
                .enter()
                .append("circle")
                .attr("r", 2)
                .attr(
                    "transform",
                    d => "translate(" + projection(d.geometry.coordinates) + ")"
                )
                .attr("fill", d => color(d.properties.state));

            // Get a flat list of clusters within each state
            // Each one is GeoJSON plus x, y, and r properties
            const clusters = getClusters(points.features);

            // Draw the clusters
            const clustered = right
                .selectAll("g")
                .data(clusters)
                .enter()
                .append("g")
                .attr("transform", d => "translate(" + d.x + " " + d.y + ")");

            clustered
                .append("circle")
                .attr("r", d => d.r)
                .attr("fill", d => color(d.properties.state));

            // Label the clusters
            clustered
                .append("text")
                .text(d => d.properties.point_count || 1)
                .attr("dy", "0.35em");

            // Clusters on the border might overlap, nudge them apart with a collision force
            d3.forceSimulation(clusters)
                .force(
                    "collide",
                    d3
                        .forceCollide()
                        .strength(0.8)
                        .radius(d => d.r)
                )
                .on("tick", () =>
                    clustered.attr("transform", d => "translate(" + d.x + " " + d.y + ")")
                );
        });

        function getClusters(points) {
            const allClusters = [];

            // Group points by state
            const byState = d3
                .nest()
                .key(d => d.properties.state)
                .entries(points);

            // Cluster each group individually
            byState.forEach(entry => {
                const index = supercluster({
                    radius: 50,
                    maxZoom: 5
                });
                index.load(entry.values);
                index.getClusters([-180, -90, 180, 90], 5).forEach(cluster => {
                    // Add x, y, r, and state properties to each cluster
                    const [x, y] = projection(cluster.geometry.coordinates);
                    cluster.properties.state = entry.key;
                    cluster.x = x;
                    cluster.y = y;
                    cluster.r = cluster.properties.point_count ? 14 : 10;
                    allClusters.push(cluster);
                });
            });

            return allClusters;
        }
    </script>

## preview.png

      
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              preview.png
            
          
## random-points.geo.json

      
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## thumbnail.png

      
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              thumbnail.png
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>
	path {
	fill: #f4f4f4;
	stroke: #666;
	stroke-width: 1px;
	}

	circle {
	stroke: none;
	}

	text {
	fill: #444;
	font-size: 12px;
	font-family: sans-serif;
	text-anchor: middle;
	}
	</style>

	<body>
	<script src="//d3js.org/d3.v5.min.js"></script>
	<script src="https://unpkg.com/supercluster@4.1.1/dist/supercluster.min.js"></script>
	<script>
	const width = 480,
	height = 500;

	const color = d3
	.scaleOrdinal()
	.range(["#ef9a9a", "#9fa8da", "#ffe082", "#80cbc4"]);

	const projection = d3.geoMercator();

	const path = d3.geoPath().projection(projection);

	const svg = d3
	.select("body")
	.append("svg")
	.attr("width", width * 2)
	.attr("height", height);

	Promise.all([
	d3.json("four-corners.geo.json"),
	d3.json("random-points.geo.json")
	]).then(([states, points]) => {
	projection.fitExtent([[10, 10], [width - 10, height - 10]], states);

	const left = svg.append("g");
	const right = svg.append("g").attr("transform", "translate(" + width + ")");

	// Draw background
	[left, right].forEach(g =>
	g
	.selectAll("path")
	.data(states.features)
	.enter()
	.append("path")
	.attr("d", path)
	);

	// Original points on left
	left
	.selectAll("circle")
	.data(points.features)
	.enter()
	.append("circle")
	.attr("r", 2)
	.attr(
	"transform",
	d => "translate(" + projection(d.geometry.coordinates) + ")"
	)
	.attr("fill", d => color(d.properties.state));

	// Get a flat list of clusters within each state
	// Each one is GeoJSON plus x, y, and r properties
	const clusters = getClusters(points.features);

	// Draw the clusters
	const clustered = right
	.selectAll("g")
	.data(clusters)
	.enter()
	.append("g")
	.attr("transform", d => "translate(" + d.x + " " + d.y + ")");

	clustered
	.append("circle")
	.attr("r", d => d.r)
	.attr("fill", d => color(d.properties.state));

	// Label the clusters
	clustered
	.append("text")
	.text(d => d.properties.point_count \|\| 1)
	.attr("dy", "0.35em");

	// Clusters on the border might overlap, nudge them apart with a collision force
	d3.forceSimulation(clusters)
	.force(
	"collide",
	d3
	.forceCollide()
	.strength(0.8)
	.radius(d => d.r)
	)
	.on("tick", () =>
	clustered.attr("transform", d => "translate(" + d.x + " " + d.y + ")")
	);
	});

	function getClusters(points) {
	const allClusters = [];

	// Group points by state
	const byState = d3
	.nest()
	.key(d => d.properties.state)
	.entries(points);

	// Cluster each group individually
	byState.forEach(entry => {
	const index = supercluster({
	radius: 50,
	maxZoom: 5
	});
	index.load(entry.values);
	index.getClusters([-180, -90, 180, 90], 5).forEach(cluster => {
	// Add x, y, r, and state properties to each cluster
	const [x, y] = projection(cluster.geometry.coordinates);
	cluster.properties.state = entry.key;
	cluster.x = x;
	cluster.y = y;
	cluster.r = cluster.properties.point_count ? 14 : 10;
	allClusters.push(cluster);
	});
	});

	return allClusters;
	}
	</script>
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