19 lines
445 B
JavaScript
19 lines
445 B
JavaScript
import {atan, cos, sin} from "../math.js";
|
|
import {azimuthalInvert} from "./azimuthal.js";
|
|
import projection from "./index.js";
|
|
|
|
export function stereographicRaw(x, y) {
|
|
var cy = cos(y), k = 1 + cos(x) * cy;
|
|
return [cy * sin(x) / k, sin(y) / k];
|
|
}
|
|
|
|
stereographicRaw.invert = azimuthalInvert(function(z) {
|
|
return 2 * atan(z);
|
|
});
|
|
|
|
export default function() {
|
|
return projection(stereographicRaw)
|
|
.scale(250)
|
|
.clipAngle(142);
|
|
}
|