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import {Adder} from "d3-array";
import {sqrt} from "../math.js";
import noop from "../noop.js";
var lengthSum = new Adder(),
lengthRing,
x00,
y00,
x0,
y0;
var lengthStream = {
point: noop,
lineStart: function() {
lengthStream.point = lengthPointFirst;
},
lineEnd: function() {
if (lengthRing) lengthPoint(x00, y00);
lengthStream.point = noop;
},
polygonStart: function() {
lengthRing = true;
},
polygonEnd: function() {
lengthRing = null;
},
result: function() {
var length = +lengthSum;
lengthSum = new Adder();
return length;
}
};
function lengthPointFirst(x, y) {
lengthStream.point = lengthPoint;
x00 = x0 = x, y00 = y0 = y;
}
function lengthPoint(x, y) {
x0 -= x, y0 -= y;
lengthSum.add(sqrt(x0 * x0 + y0 * y0));
x0 = x, y0 = y;
}
export default lengthStream;