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Contents?: true
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Versions: 5
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Stored size: 1.04 KB
Contents
import "../math/trigonometry";
import "geo";
d3.geo.interpolate = function(source, target) {
return d3_geo_interpolate(
source[0] * d3_radians, source[1] * d3_radians,
target[0] * d3_radians, target[1] * d3_radians
);
};
function d3_geo_interpolate(x0, y0, x1, y1) {
var cy0 = Math.cos(y0),
sy0 = Math.sin(y0),
cy1 = Math.cos(y1),
sy1 = Math.sin(y1),
kx0 = cy0 * Math.cos(x0),
ky0 = cy0 * Math.sin(x0),
kx1 = cy1 * Math.cos(x1),
ky1 = cy1 * Math.sin(x1),
d = 2 * Math.asin(Math.sqrt(d3_haversin(y1 - y0) + cy0 * cy1 * d3_haversin(x1 - x0))),
k = 1 / Math.sin(d);
var interpolate = d ? function(t) {
var B = Math.sin(t *= d) * k,
A = Math.sin(d - t) * k,
x = A * kx0 + B * kx1,
y = A * ky0 + B * ky1,
z = A * sy0 + B * sy1;
return [
Math.atan2(y, x) * d3_degrees,
Math.atan2(z, Math.sqrt(x * x + y * y)) * d3_degrees
];
} : function() { return [x0 * d3_degrees, y0 * d3_degrees]; };
interpolate.distance = d;
return interpolate;
};
Version data entries
5 entries across 5 versions & 3 rubygems