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18 lines
498 B
JavaScript
18 lines
498 B
JavaScript
import {geoProjection as projection} from "d3-geo";
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import {atan, cos, sqrtPi, tan} from "./math.js";
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export function foucautRaw(lambda, phi) {
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var k = phi / 2, cosk = cos(k);
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return [ 2 * lambda / sqrtPi * cos(phi) * cosk * cosk, sqrtPi * tan(k)];
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}
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foucautRaw.invert = function(x, y) {
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var k = atan(y / sqrtPi), cosk = cos(k), phi = 2 * k;
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return [x * sqrtPi / 2 / (cos(phi) * cosk * cosk), phi];
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};
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export default function() {
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return projection(foucautRaw)
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.scale(135.264);
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}
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