Sha256: e0feec53e31659cbd802d6d0d091d0f2dccfb9f2776e986d565dd09c9044f53e
Contents?: true
Size: 1.7 KB
Versions: 25
Compression:
Stored size: 1.7 KB
Contents
d3.geo.bonne = function() {
var scale = 200,
translate = [480, 250],
x0, // origin longitude in radians
y0, // origin latitude in radians
y1, // parallel latitude in radians
c1; // cot(y1)
function bonne(coordinates) {
var x = coordinates[0] * d3_geo_radians - x0,
y = coordinates[1] * d3_geo_radians - y0;
if (y1) {
var p = c1 + y1 - y, E = x * Math.cos(y) / p;
x = p * Math.sin(E);
y = p * Math.cos(E) - c1;
} else {
x *= Math.cos(y);
y *= -1;
}
return [
scale * x + translate[0],
scale * y + translate[1]
];
}
bonne.invert = function(coordinates) {
var x = (coordinates[0] - translate[0]) / scale,
y = (coordinates[1] - translate[1]) / scale;
if (y1) {
var c = c1 + y, p = Math.sqrt(x * x + c * c);
y = c1 + y1 - p;
x = x0 + p * Math.atan2(x, c) / Math.cos(y);
} else {
y *= -1;
x /= Math.cos(y);
}
return [
x / d3_geo_radians,
y / d3_geo_radians
];
};
// 90° for Werner, 0° for Sinusoidal
bonne.parallel = function(x) {
if (!arguments.length) return y1 / d3_geo_radians;
c1 = 1 / Math.tan(y1 = x * d3_geo_radians);
return bonne;
};
bonne.origin = function(x) {
if (!arguments.length) return [x0 / d3_geo_radians, y0 / d3_geo_radians];
x0 = x[0] * d3_geo_radians;
y0 = x[1] * d3_geo_radians;
return bonne;
};
bonne.scale = function(x) {
if (!arguments.length) return scale;
scale = +x;
return bonne;
};
bonne.translate = function(x) {
if (!arguments.length) return translate;
translate = [+x[0], +x[1]];
return bonne;
};
return bonne.origin([0, 0]).parallel(45);
};
Version data entries
25 entries across 25 versions & 1 rubygems