d3.geo.bounds = d3_geo_bounds();

function d3_geo_bounds(projection) {

var x0, y0, x1, y1;

var bound = {

point: boundPoint,

lineStart: d3_noop,

lineEnd: d3_noop,

// While inside a polygon, ignore points in holes.

polygonStart: function() { bound.lineEnd = boundPolygonLineEnd; },

polygonEnd: function() { bound.point = boundPoint; }

};

var projectBound = projection ? projection.stream(bound) : bound;

function boundPoint(x, y) {

if (x < x0) x0 = x;

if (x > x1) x1 = x;

if (y < y0) y0 = y;

if (y > y1) y1 = y;

}

function boundPolygonLineEnd() {

bound.point = bound.lineEnd = d3_noop;

}

return function(feature) {

y1 = x1 = -(x0 = y0 = Infinity);

d3.geo.stream(feature, projectBound);

return [[x0, y0], [x1, y1]];

};

}