You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

534 lines
18 KiB
JavaScript

This file contains ambiguous Unicode characters!

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

!function() {
var topojson = {
version: "1.6.20",
mesh: function(topology) { return object(topology, meshArcs.apply(this, arguments)); },
meshArcs: meshArcs,
merge: function(topology) { return object(topology, mergeArcs.apply(this, arguments)); },
mergeArcs: mergeArcs,
feature: featureOrCollection,
neighbors: neighbors,
presimplify: presimplify
};
function stitchArcs(topology, arcs) {
var stitchedArcs = {},
fragmentByStart = {},
fragmentByEnd = {},
fragments = [],
emptyIndex = -1;
// Stitch empty arcs first, since they may be subsumed by other arcs.
arcs.forEach(function(i, j) {
var arc = topology.arcs[i < 0 ? ~i : i], t;
if (arc.length < 3 && !arc[1][0] && !arc[1][1]) {
t = arcs[++emptyIndex], arcs[emptyIndex] = i, arcs[j] = t;
}
});
arcs.forEach(function(i) {
var e = ends(i),
start = e[0],
end = e[1],
f, g;
if (f = fragmentByEnd[start]) {
delete fragmentByEnd[f.end];
f.push(i);
f.end = end;
if (g = fragmentByStart[end]) {
delete fragmentByStart[g.start];
var fg = g === f ? f : f.concat(g);
fragmentByStart[fg.start = f.start] = fragmentByEnd[fg.end = g.end] = fg;
} else {
fragmentByStart[f.start] = fragmentByEnd[f.end] = f;
}
} else if (f = fragmentByStart[end]) {
delete fragmentByStart[f.start];
f.unshift(i);
f.start = start;
if (g = fragmentByEnd[start]) {
delete fragmentByEnd[g.end];
var gf = g === f ? f : g.concat(f);
fragmentByStart[gf.start = g.start] = fragmentByEnd[gf.end = f.end] = gf;
} else {
fragmentByStart[f.start] = fragmentByEnd[f.end] = f;
}
} else {
f = [i];
fragmentByStart[f.start = start] = fragmentByEnd[f.end = end] = f;
}
});
function ends(i) {
var arc = topology.arcs[i < 0 ? ~i : i], p0 = arc[0], p1;
if (topology.transform) p1 = [0, 0], arc.forEach(function(dp) { p1[0] += dp[0], p1[1] += dp[1]; });
else p1 = arc[arc.length - 1];
return i < 0 ? [p1, p0] : [p0, p1];
}
function flush(fragmentByEnd, fragmentByStart) {
for (var k in fragmentByEnd) {
var f = fragmentByEnd[k];
delete fragmentByStart[f.start];
delete f.start;
delete f.end;
f.forEach(function(i) { stitchedArcs[i < 0 ? ~i : i] = 1; });
fragments.push(f);
}
}
flush(fragmentByEnd, fragmentByStart);
flush(fragmentByStart, fragmentByEnd);
arcs.forEach(function(i) { if (!stitchedArcs[i < 0 ? ~i : i]) fragments.push([i]); });
return fragments;
}
function meshArcs(topology, o, filter) {
var arcs = [];
if (arguments.length > 1) {
var geomsByArc = [],
geom;
function arc(i) {
var j = i < 0 ? ~i : i;
(geomsByArc[j] || (geomsByArc[j] = [])).push({i: i, g: geom});
}
function line(arcs) {
arcs.forEach(arc);
}
function polygon(arcs) {
arcs.forEach(line);
}
function geometry(o) {
if (o.type === "GeometryCollection") o.geometries.forEach(geometry);
else if (o.type in geometryType) geom = o, geometryType[o.type](o.arcs);
}
var geometryType = {
LineString: line,
MultiLineString: polygon,
Polygon: polygon,
MultiPolygon: function(arcs) { arcs.forEach(polygon); }
};
geometry(o);
geomsByArc.forEach(arguments.length < 3
? function(geoms) { arcs.push(geoms[0].i); }
: function(geoms) { if (filter(geoms[0].g, geoms[geoms.length - 1].g)) arcs.push(geoms[0].i); });
} else {
for (var i = 0, n = topology.arcs.length; i < n; ++i) arcs.push(i);
}
return {type: "MultiLineString", arcs: stitchArcs(topology, arcs)};
}
function mergeArcs(topology, objects) {
var polygonsByArc = {},
polygons = [],
components = [];
objects.forEach(function(o) {
if (o.type === "Polygon") register(o.arcs);
else if (o.type === "MultiPolygon") o.arcs.forEach(register);
});
function register(polygon) {
polygon.forEach(function(ring) {
ring.forEach(function(arc) {
(polygonsByArc[arc = arc < 0 ? ~arc : arc] || (polygonsByArc[arc] = [])).push(polygon);
});
});
polygons.push(polygon);
}
function exterior(ring) {
return cartesianRingArea(object(topology, {type: "Polygon", arcs: [ring]}).coordinates[0]) > 0; // TODO allow spherical?
}
polygons.forEach(function(polygon) {
if (!polygon._) {
var component = [],
neighbors = [polygon];
polygon._ = 1;
components.push(component);
while (polygon = neighbors.pop()) {
component.push(polygon);
polygon.forEach(function(ring) {
ring.forEach(function(arc) {
polygonsByArc[arc < 0 ? ~arc : arc].forEach(function(polygon) {
if (!polygon._) {
polygon._ = 1;
neighbors.push(polygon);
}
});
});
});
}
}
});
polygons.forEach(function(polygon) {
delete polygon._;
});
return {
type: "MultiPolygon",
arcs: components.map(function(polygons) {
var arcs = [], n;
// Extract the exterior (unique) arcs.
polygons.forEach(function(polygon) {
polygon.forEach(function(ring) {
ring.forEach(function(arc) {
if (polygonsByArc[arc < 0 ? ~arc : arc].length < 2) {
arcs.push(arc);
}
});
});
});
// Stitch the arcs into one or more rings.
arcs = stitchArcs(topology, arcs);
// If more than one ring is returned,
// at most one of these rings can be the exterior;
// this exterior ring has the same winding order
// as any exterior ring in the original polygons.
if ((n = arcs.length) > 1) {
var sgn = exterior(polygons[0][0]);
for (var i = 0, t; i < n; ++i) {
if (sgn === exterior(arcs[i])) {
t = arcs[0], arcs[0] = arcs[i], arcs[i] = t;
break;
}
}
}
return arcs;
})
};
}
function featureOrCollection(topology, o) {
return o.type === "GeometryCollection" ? {
type: "FeatureCollection",
features: o.geometries.map(function(o) { return feature(topology, o); })
} : feature(topology, o);
}
function feature(topology, o) {
var f = {
type: "Feature",
id: o.id,
properties: o.properties || {},
geometry: object(topology, o)
};
if (o.id == null) delete f.id;
return f;
}
function object(topology, o) {
var absolute = transformAbsolute(topology.transform),
arcs = topology.arcs;
function arc(i, points) {
if (points.length) points.pop();
for (var a = arcs[i < 0 ? ~i : i], k = 0, n = a.length, p; k < n; ++k) {
points.push(p = a[k].slice());
absolute(p, k);
}
if (i < 0) reverse(points, n);
}
function point(p) {
p = p.slice();
absolute(p, 0);
return p;
}
function line(arcs) {
var points = [];
for (var i = 0, n = arcs.length; i < n; ++i) arc(arcs[i], points);
if (points.length < 2) points.push(points[0].slice());
return points;
}
function ring(arcs) {
var points = line(arcs);
while (points.length < 4) points.push(points[0].slice());
return points;
}
function polygon(arcs) {
return arcs.map(ring);
}
function geometry(o) {
var t = o.type;
return t === "GeometryCollection" ? {type: t, geometries: o.geometries.map(geometry)}
: t in geometryType ? {type: t, coordinates: geometryType[t](o)}
: null;
}
var geometryType = {
Point: function(o) { return point(o.coordinates); },
MultiPoint: function(o) { return o.coordinates.map(point); },
LineString: function(o) { return line(o.arcs); },
MultiLineString: function(o) { return o.arcs.map(line); },
Polygon: function(o) { return polygon(o.arcs); },
MultiPolygon: function(o) { return o.arcs.map(polygon); }
};
return geometry(o);
}
function reverse(array, n) {
var t, j = array.length, i = j - n; while (i < --j) t = array[i], array[i++] = array[j], array[j] = t;
}
function bisect(a, x) {
var lo = 0, hi = a.length;
while (lo < hi) {
var mid = lo + hi >>> 1;
if (a[mid] < x) lo = mid + 1;
else hi = mid;
}
return lo;
}
function neighbors(objects) {
var indexesByArc = {}, // arc index -> array of object indexes
neighbors = objects.map(function() { return []; });
function line(arcs, i) {
arcs.forEach(function(a) {
if (a < 0) a = ~a;
var o = indexesByArc[a];
if (o) o.push(i);
else indexesByArc[a] = [i];
});
}
function polygon(arcs, i) {
arcs.forEach(function(arc) { line(arc, i); });
}
function geometry(o, i) {
if (o.type === "GeometryCollection") o.geometries.forEach(function(o) { geometry(o, i); });
else if (o.type in geometryType) geometryType[o.type](o.arcs, i);
}
var geometryType = {
LineString: line,
MultiLineString: polygon,
Polygon: polygon,
MultiPolygon: function(arcs, i) { arcs.forEach(function(arc) { polygon(arc, i); }); }
};
objects.forEach(geometry);
for (var i in indexesByArc) {
for (var indexes = indexesByArc[i], m = indexes.length, j = 0; j < m; ++j) {
for (var k = j + 1; k < m; ++k) {
var ij = indexes[j], ik = indexes[k], n;
if ((n = neighbors[ij])[i = bisect(n, ik)] !== ik) n.splice(i, 0, ik);
if ((n = neighbors[ik])[i = bisect(n, ij)] !== ij) n.splice(i, 0, ij);
}
}
}
return neighbors;
}
function presimplify(topology, triangleArea) {
var absolute = transformAbsolute(topology.transform),
relative = transformRelative(topology.transform),
heap = minAreaHeap();
if (!triangleArea) triangleArea = cartesianTriangleArea;
topology.arcs.forEach(function(arc) {
var triangles = [],
maxArea = 0,
triangle;
// To store each pointââ¬â„¢s effective area, we create a new array rather than
// extending the passed-in point to workaround a Chrome/V8 bug (getting
// stuck in smi mode). For midpoints, the initial effective area of
// Infinity will be computed in the next step.
for (var i = 0, n = arc.length, p; i < n; ++i) {
p = arc[i];
absolute(arc[i] = [p[0], p[1], Infinity], i);
}
for (var i = 1, n = arc.length - 1; i < n; ++i) {
triangle = arc.slice(i - 1, i + 2);
triangle[1][2] = triangleArea(triangle);
triangles.push(triangle);
heap.push(triangle);
}
for (var i = 0, n = triangles.length; i < n; ++i) {
triangle = triangles[i];
triangle.previous = triangles[i - 1];
triangle.next = triangles[i + 1];
}
while (triangle = heap.pop()) {
var previous = triangle.previous,
next = triangle.next;
// If the area of the current point is less than that of the previous point
// to be eliminated, use the latter's area instead. This ensures that the
// current point cannot be eliminated without eliminating previously-
// eliminated points.
if (triangle[1][2] < maxArea) triangle[1][2] = maxArea;
else maxArea = triangle[1][2];
if (previous) {
previous.next = next;
previous[2] = triangle[2];
update(previous);
}
if (next) {
next.previous = previous;
next[0] = triangle[0];
update(next);
}
}
arc.forEach(relative);
});
function update(triangle) {
heap.remove(triangle);
triangle[1][2] = triangleArea(triangle);
heap.push(triangle);
}
return topology;
}
function cartesianRingArea(ring) {
var i = -1,
n = ring.length,
a,
b = ring[n - 1],
area = 0;
while (++i < n) {
a = b;
b = ring[i];
area += a[0] * b[1] - a[1] * b[0];
}
return area / 2;
}
function cartesianTriangleArea(triangle) {
var a = triangle[0], b = triangle[1], c = triangle[2];
return Math.abs((a[0] - c[0]) * (b[1] - a[1]) - (a[0] - b[0]) * (c[1] - a[1]));
}
function compareArea(a, b) {
return a[1][2] - b[1][2];
}
function minAreaHeap() {
var heap = {},
array = [],
size = 0;
heap.push = function(object) {
up(array[object._ = size] = object, size++);
return size;
};
heap.pop = function() {
if (size <= 0) return;
var removed = array[0], object;
if (--size > 0) object = array[size], down(array[object._ = 0] = object, 0);
return removed;
};
heap.remove = function(removed) {
var i = removed._, object;
if (array[i] !== removed) return; // invalid request
if (i !== --size) object = array[size], (compareArea(object, removed) < 0 ? up : down)(array[object._ = i] = object, i);
return i;
};
function up(object, i) {
while (i > 0) {
var j = ((i + 1) >> 1) - 1,
parent = array[j];
if (compareArea(object, parent) >= 0) break;
array[parent._ = i] = parent;
array[object._ = i = j] = object;
}
}
function down(object, i) {
while (true) {
var r = (i + 1) << 1,
l = r - 1,
j = i,
child = array[j];
if (l < size && compareArea(array[l], child) < 0) child = array[j = l];
if (r < size && compareArea(array[r], child) < 0) child = array[j = r];
if (j === i) break;
array[child._ = i] = child;
array[object._ = i = j] = object;
}
}
return heap;
}
function transformAbsolute(transform) {
if (!transform) return noop;
var x0,
y0,
kx = transform.scale[0],
ky = transform.scale[1],
dx = transform.translate[0],
dy = transform.translate[1];
return function(point, i) {
if (!i) x0 = y0 = 0;
point[0] = (x0 += point[0]) * kx + dx;
point[1] = (y0 += point[1]) * ky + dy;
};
}
function transformRelative(transform) {
if (!transform) return noop;
var x0,
y0,
kx = transform.scale[0],
ky = transform.scale[1],
dx = transform.translate[0],
dy = transform.translate[1];
return function(point, i) {
if (!i) x0 = y0 = 0;
var x1 = (point[0] - dx) / kx | 0,
y1 = (point[1] - dy) / ky | 0;
point[0] = x1 - x0;
point[1] = y1 - y0;
x0 = x1;
y0 = y1;
};
}
function noop() {}
if (typeof define === "function" && define.amd) define(topojson);
else if (typeof module === "object" && module.exports) module.exports = topojson;
else this.topojson = topojson;
}();