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jgaffuri
GIS and cartography at Eurostat
Public
Striped circles
Edited
Apr 28, 2022
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12 stars
Striped circles
An introduction to striped circle symbol
Main causes of death in EuropeElection map as striped circles #1Election map as striped circles #2Cartographie de l'élection présidentielle 2022 au niveau communalElection map as Dorling striped circles - municipality levelInitial tests on striped circle symbol
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f = (theta) => theta - Math.sin(theta)
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frec = (v) => {
const t = Math.pow(6 * v, 1 / 3);
const t2 = t * t;
const t4 = t2 * t2;
const t6 = t4 * t2;
return (
(t * (1 - (1267 / 9428) * t2 + (31 / 6507) * t4 - (1 / 32473) * t6)) /
(1 - (2251 / 14902) * t2 + (63 / 9593) * t4 - (1 / 13890) * t6)
);
}
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f(frec(x)) - x
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frec(f(x)) - x
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d_ = (perc) => {
const theta = frec(perc * 2 * Math.PI);
return 0.5 * (1 - Math.cos(theta / 2));
}
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d = (perc) => {
if (perc > 0.5) return 1 - d_(1 - perc);
return d_(perc);
}
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colors = ["#66c2a5", "#fc8d62", "#8da0cb"]
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data = [class0, class1, class2]
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