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var d3_geo_clipAntimeridian = d3_geo_clip(
d3_true,
d3_geo_clipAntimeridianLine,
d3_geo_clipAntimeridianInterpolate,
[-π, -π / 2]);
// Takes a line and cuts into visible segments. Return values:
function d3_geo_clipAntimeridianLine(listener) {
var λ0 = NaN,
φ0 = NaN,
0 = NaN,
clean; // no intersections
return {
lineStart: function() {
listener.lineStart();
clean = 1;
},
point: function(λ1, φ1) {
var1 = λ1 > 0 ? π : -π,
= abs1 - λ0);
if (abs(dλ - π) < ε) { // line crosses a pole
listener.point(λ0, φ0 =0 + φ1) / 2 > 0 ? halfπ : -halfπ);
listener.point(sλ0, φ0);
listener.lineEnd();
listener.lineStart();
listener.point(sλ1, φ0);
listener.point(λ1, φ0);
clean = 0;
} else if (sλ0 !==1 &&>= π) { // line crosses antimeridian
// handle degeneracies
if (abs0 -0) < ε) λ0 -=0 * ε;
if (abs1 -1) < ε) λ1 -=1 * ε;
φ0 = d3_geo_clipAntimeridianIntersect(λ0, φ0, λ1, φ1);
listener.point(sλ0, φ0);
listener.lineEnd();
listener.lineStart();
listener.point(sλ1, φ0);
clean = 0;
}
listener.point(λ0 = λ1, φ0 = φ1);
0 =1;
},
lineEnd: function() {
listener.lineEnd();
λ0 = φ0 = NaN;
},
// if there are intersections, we always rejoin the first and last segments.
clean: function() { return 2 - clean; }
};
}
function d3_geo_clipAntimeridianIntersect(λ0, φ0, λ1, φ1) {
var cosφ0,
cosφ1,
sinλ0_λ1 = Math.sin0 - λ1);
return abs(sinλ0_λ1) > ε