File size: 855 Bytes
bc20498 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 |
import {abs, atan2, cos, epsilon, pi, sign, sin, sqrt} from "../math.js";
import {conicProjection} from "./conic.js";
import {equirectangularRaw} from "./equirectangular.js";
export function conicEquidistantRaw(y0, y1) {
var cy0 = cos(y0),
n = y0 === y1 ? sin(y0) : (cy0 - cos(y1)) / (y1 - y0),
g = cy0 / n + y0;
if (abs(n) < epsilon) return equirectangularRaw;
function project(x, y) {
var gy = g - y, nx = n * x;
return [gy * sin(nx), g - gy * cos(nx)];
}
project.invert = function(x, y) {
var gy = g - y,
l = atan2(x, abs(gy)) * sign(gy);
if (gy * n < 0)
l -= pi * sign(x) * sign(gy);
return [l / n, g - sign(n) * sqrt(x * x + gy * gy)];
};
return project;
}
export default function() {
return conicProjection(conicEquidistantRaw)
.scale(131.154)
.center([0, 13.9389]);
}
|