Sha256: 85b2f9eda63e2f260816add8fb002c8f4d06371e58d3f916902a0be8a56dd38c
Contents?: true
Size: 950 Bytes
Versions: 2
Compression:
Stored size: 950 Bytes
Contents
function august(λ, φ) { var tanφ = Math.tan(φ / 2), k = asqrt(1 - tanφ * tanφ), c = 1 + k * Math.cos(λ /= 2), x = Math.sin(λ) * k / c, y = tanφ / c, x2 = x * x, y2 = y * y; return [ 4 / 3 * x * (3 + x2 - 3 * y2), 4 / 3 * y * (3 + 3 * x2 - y2) ]; } august.invert = function(x, y) { x *= 3 / 8, y *= 3 / 8; if (!x && Math.abs(y) > 1) return null; var x2 = x * x, y2 = y * y, s = 1 + x2 + y2, sin3η = Math.sqrt(.5 * (s - Math.sqrt(s * s - 4 * y * y))), η = asin(sin3η) / 3, ξ = sin3η ? arcosh(Math.abs(y / sin3η)) / 3 : arsinh(Math.abs(x)) / 3, cosη = Math.cos(η), coshξ = cosh(ξ), d = coshξ * coshξ - cosη * cosη; return [ sgn(x) * 2 * Math.atan2(sinh(ξ) * cosη, .25 - d), sgn(y) * 2 * Math.atan2(coshξ * Math.sin(η), .25 + d) ]; }; (d3.geo.august = function() { return projection(august); }).raw = august;
Version data entries
2 entries across 2 versions & 1 rubygems
Version | Path |
---|---|
d3js-plugins-rails-0.0.4 | vendor/assets/javascripts/d3/plugins/geo/projection/august.js |
d3js-plugins-rails-0.0.3 | vendor/assets/javascripts/d3/plugins/geo/projection/august.js |