US simple hex map using threshold scale / Sundar Singh

Sundar Singh

playing with space, shape, colour & composition

Workspace

Public

d3 reusable visuals

Edited

Mar 9, 2023

1 fork

1 star

usHexMap(sample_data, {

topojson: topojson,

stateCodesWithNames: stateCodesWithNames

})

function usHexMap (data, {

topojson = null,

stateCodesWithNames = null,

colorRange = ['#eee','#23c17c','#4f8fe6', '#6f0043', '#eee'], // low to high

colorDomain = [0, 50, 75, 100],

f = d3.format('.1f'), // round to 1 decimal

height = 600, // svg height (without margins)

margin = {top: 5, right: 10, bottom: 5, left: 10} // svg margins/padding

} = {}) {

// set the dimensions and margins of the graph

const w = width - margin.left - margin.right;

const h = height - margin.top - margin.bottom;

const svg = DOM.svg(width, height);

const sel = d3.select(svg)

.append('g')

.attr('transform', `translate(${margin.left},${margin.top})`);

const tiles = topojson.feature(tilegram, tilegram.objects.tiles);

const transform = d3.geoTransform({

point: function (x, y) { return this.stream.point(x, -y) }

});

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

const g = sel.append('g')

.attr('transform', 'translate(-350,' + (h-10) + ')');

const thresholdScale = d3.scaleThreshold()

.domain(colorDomain)

.range(colorRange);

const borders = g.selectAll('path')

.data(tiles.features)

.join('path')

.attr('d', path)

.attr('class', 'border')

.attr('fill', d => {

const state = d.properties.state;

const datum = _.find(data, o => o.code === state);

return thresholdScale(datum.value)

})

.attr('stroke', '#fff')

.attr('stroke-width', 4)

.on('click', (e, d) => console.log('d', d));

borders.on('mouseover', function (e, d) {

const state = d.properties.state;

const datum = _.find(data, o => o.code === state);

const label = _.find(stateCodesWithNames, o => o.code === state);

sel.select('text.info').text(`${label.state} ${f(datum.value)}`);

});

// add some labels

g.selectAll('.state-label')

.data(tiles.features)

.join('text')

.attr('class', d => 'state-label state-label-' + d.id)

.attr('transform', d => `translate(${path.centroid(d)})`)

.attr('dy', '.35em')

//.attr('dx', '-10px')

.text(d => d.properties.state);

// output some info

sel.append('text')

.attr('y', 20)

.attr('x', -10)

.attr('class', 'info');

// have a legend

const legend = sel.append('g')

.attr('class', 'legend-wrap')

.attr('transform', `translate(${(w- 300)},${(h-10)})`)

.selectAll('g.legend')

.attr('class', 'legend')

.data(colorDomain)

.join('g')

.attr('class', 'legend')

legend.append('rect')

.attr('x', (d, i) => i * 80)

.attr('fill', (d, i) => thresholdScale(d) )

.attr('width', 80)

.attr('height', 10);

legend.append('text')

.attr('x', (d, i) => i * 80 + 40)

.attr('y', -5)

.attr('text-anchor', 'middle')

.text(d => `> ${d}`);

return svg;

}

// dummy data

sample_data = stateCodesWithNames.map(d => {

return {

code: d.code,

value : _.random(1, 98.5)

}

})

topojson = require('topojson')

<hr>

<style>

text {

font-family:'Space Mono',monospace;

}

.border:hover {

fill: #d1bd19;

cursor: pointer;

}

.state-label {

fill: #fff;

fill-opacity: .9;

letter-spacing: 1px;

font-size: 18px;

font-weight: 600;

text-anchor: middle;

pointer-events: none;

}

</style>

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