Sha256: 07584f6958743f79993bb3ce0d264401574e58b040ca95df351ed592f7b0428b
Contents?: true
Size: 1.56 KB
Versions: 8
Compression:
Stored size: 1.56 KB
Contents
(function() {
var ρ = Math.SQRT2,
ρ2 = 2,
ρ4 = 4;
// p0 = [ux0, uy0, w0]
// p1 = [ux1, uy1, w1]
d3.interpolateZoom = function(p0, p1) {
var ux0 = p0[0], uy0 = p0[1], w0 = p0[2],
ux1 = p1[0], uy1 = p1[1], w1 = p1[2];
return ux0 === ux1 && uy0 === uy1
? interpolate1(ux0, uy0, w0, w1)
: interpolate2(ux0, uy0, ux1, uy1, w0, w1);
};
// Special case for u0 = u1.
function interpolate1(ux0, uy0, w0, w1) {
var S = Math.abs(Math.log(w1 / w0)) / ρ,
k = w1 < w0 ? -1 : 1;
function interpolate(t) {
var s = t * S;
return [
ux0,
uy0,
w0 * Math.exp(k * ρ * s)
];
}
interpolate.duration = S * 1000;
return interpolate;
};
// General case.
function interpolate2(ux0, uy0, ux1, uy1, w0, w1) {
var dx = ux1 - ux0,
dy = uy1 - uy0,
d2 = dx * dx + dy * dy,
d1 = Math.sqrt(d2),
b0 = (w1 * w1 - w0 * w0 + ρ4 * d2) / (2 * w0 * ρ2 * d1),
b1 = (w1 * w1 - w0 * w0 - ρ4 * d2) / (2 * w1 * ρ2 * d1),
r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0),
r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1),
S = (r1 - r0) / ρ;
function interpolate(t) {
var s = t * S,
u = w0 / (ρ2 * d1) * (cosh(r0) * tanh(ρ * s + r0) - sinh(r0));
return [
ux0 + u * dx,
uy0 + u * dy,
w0 * cosh(r0) / cosh(ρ * s + r0)
];
};
interpolate.duration = S * 1000;
return interpolate;
};
function cosh(x) {
return (Math.exp(x) + Math.exp(-x)) / 2;
}
function sinh(x) {
return (Math.exp(x) - Math.exp(-x)) / 2;
}
function tanh(x) {
return sinh(x) / cosh(x);
}
})();
Version data entries
8 entries across 8 versions & 1 rubygems