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(function() {
d3.fisheye = {
scale: function(scaleType) {
return d3_fisheye_scale(scaleType(), 3, 0);
},
circular: function() {
var radius = 200,
distortion = 2,
k0,
k1,
focus = [0, 0];
function fisheye(d) {
var dx = d.x - focus[0],
dy = d.y - focus[1],
dd = Math.sqrt(dx * dx + dy * dy);
if (!dd || dd >= radius) return {x: d.x, y: d.y, z: 1};
var k = k0 * (1 - Math.exp(-dd * k1)) / dd * .75 + .25;
return {x: focus[0] + dx * k, y: focus[1] + dy * k, z: Math.min(k, 10)};
}
function rescale() {
k0 = Math.exp(distortion);
k0 = k0 / (k0 - 1) * radius;
k1 = distortion / radius;
return fisheye;
}
fisheye.radius = function(_) {
if (!arguments.length) return radius;
radius = +_;
return rescale();
};
fisheye.distortion = function(_) {
if (!arguments.length) return distortion;
distortion = +_;
return rescale();
};
fisheye.focus = function(_) {
if (!arguments.length) return focus;
focus = _;
return fisheye;
};
return rescale();
}
};
function d3_fisheye_scale(scale, d, a) {
function fisheye(_) {
var x = scale(_),
left = x < a,
v,
range = d3.extent(scale.range()),
min = range[0],
max = range[1],
m = left ? a - min : max - a;
if (m == 0) m = max - min;
return (left ? -1 : 1) * m * (d + 1) / (d + (m / Math.abs(x - a))) + a;
}
fisheye.distortion = function(_) {
if (!arguments.length) return d;
d = +_;
return fisheye;
};
fisheye.focus = function(_) {
if (!arguments.length) return a;
a = +_;
return fisheye;
};
fisheye.copy = function() {
return d3_fisheye_scale(scale.copy(), d, a);
};
fisheye.nice = scale.nice;
fisheye.ticks = scale.ticks;
fisheye.tickFormat = scale.tickFormat;
return d3.rebind(fisheye, scale, "domain", "range");
}
})();
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