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File size: 1,989 Bytes
e7b2eb4 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | import "../arrays/range";
import "../arrays/sum";
import "../math/trigonometry";
import "layout";
d3.layout.pie = function() {
var value = Number,
sort = d3_layout_pieSortByValue,
startAngle = 0,
endAngle = τ,
padAngle = 0;
function pie(data) {
var n = data.length,
values = data.map(function(d, i) { return +value.call(pie, d, i); }),
a = +(typeof startAngle === "function" ? startAngle.apply(this, arguments) : startAngle),
da = (typeof endAngle === "function" ? endAngle.apply(this, arguments) : endAngle) - a,
p = Math.min(Math.abs(da) / n, +(typeof padAngle === "function" ? padAngle.apply(this, arguments) : padAngle)),
pa = p * (da < 0 ? -1 : 1),
sum = d3.sum(values),
k = sum ? (da - n * pa) / sum : 0,
index = d3.range(n),
arcs = [],
v;
// Optionally sort the data.
if (sort != null) index.sort(sort === d3_layout_pieSortByValue
? function(i, j) { return values[j] - values[i]; }
: function(i, j) { return sort(data[i], data[j]); });
// Compute the arcs! They are stored in the original data's order.
index.forEach(function(i) {
arcs[i] = {
data: data[i],
value: v = values[i],
startAngle: a,
endAngle: a += v * k + pa,
padAngle: p
};
});
return arcs;
}
pie.value = function(_) {
if (!arguments.length) return value;
value = _;
return pie;
};
pie.sort = function(_) {
if (!arguments.length) return sort;
sort = _;
return pie;
};
pie.startAngle = function(_) {
if (!arguments.length) return startAngle;
startAngle = _;
return pie;
};
pie.endAngle = function(_) {
if (!arguments.length) return endAngle;
endAngle = _;
return pie;
};
pie.padAngle = function(_) {
if (!arguments.length) return padAngle;
padAngle = _;
return pie;
};
return pie;
};
var d3_layout_pieSortByValue = {};
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