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/* Test boundary conditions for $minDistance option for $near and $nearSphere
* queries. SERVER-9395.
*/
var t = db.geo_mindistance_boundaries;
t.drop();
t.insert({loc: [1, 0]}); // 1 degree of longitude from origin.
/* $minDistance is supported for 2dsphere index only, not 2d or geoHaystack. */
t.ensureIndex({loc: "2dsphere"});
//
// Useful constants.
//
var km = 1000,
earthRadiusMeters = 6378.1 * km,
geoJSONPoint = {type: 'Point', coordinates: [0, 0]},
// One degree of longitude at the equator, about 111 km.
degreeInMeters = 2 * Math.PI * earthRadiusMeters / 360,
metersEpsilon = Number.MIN_VALUE;
/* Grow epsilon's exponent until epsilon exceeds the margin of error for the
* representation of degreeInMeters. The server uses 64-bit math, too, so we'll
* find the smallest epsilon the server can detect.
*/
while (degreeInMeters + metersEpsilon == degreeInMeters) { metersEpsilon *= 2; }
//
// Test boundary conditions for $near and GeoJSON, in meters.
//
// minDistance must be within the args to $near, not on the side.
assert.throws(function() { t.find({loc:{$near:{$geometry: geoJSONPoint},
$minDistance:0.1}}).itcount();});
assert.eq(
1, t.find({loc: {
$near: {$geometry: geoJSONPoint,
$minDistance: degreeInMeters
}}}).itcount(),
"Expected to find (0, 1) within $minDistance 1 degree from origin"
);
assert.eq(
1, t.find({loc: {
$near: {$geometry: geoJSONPoint,
$minDistance: degreeInMeters - metersEpsilon
}}}).itcount(),
"Expected to find (0, 1) within $minDistance (1 degree - epsilon) from origin"
);
assert.eq(
0, t.find({loc: {
$near: {$geometry: geoJSONPoint,
$minDistance: degreeInMeters + metersEpsilon
}}}).itcount(),
"Expected *not* to find (0, 1) within $minDistance (1 degree + epsilon) from origin"
);
//
// Test boundary conditions for $nearSphere and GeoJSON, in meters.
//
assert.eq(
1, t.find({loc: {
$nearSphere: {$geometry: geoJSONPoint,
$minDistance: degreeInMeters
}}}).itcount(),
"Expected to find (0, 1) within $minDistance 1 degree from origin"
);
assert.eq(
1, t.find({loc: {
$nearSphere: geoJSONPoint,
$minDistance: degreeInMeters - metersEpsilon
}}).itcount(),
"Expected to find (0, 1) within $minDistance (1 degree - epsilon) from origin"
);
assert.eq(
0, t.find({loc: {
$nearSphere: geoJSONPoint,
$minDistance: degreeInMeters + metersEpsilon
}}).itcount(),
"Expected *not* to find (0, 1) within $minDistance (1 degree + epsilon) from origin"
);
//
// Test boundary conditions for $nearSphere and a legacy point, in radians.
//
// $minDistance with legacy point requires $nearSphere; $near not
// supported.
//
var legacyPoint = [0, 0],
degreeInRadians = 2 * Math.PI / 360,
radiansEpsilon = Number.MIN_VALUE;
while (1 + radiansEpsilon == 1) { radiansEpsilon *= 2; }
assert.eq(
1, t.find({loc: {
$nearSphere: legacyPoint,
$minDistance: degreeInRadians
}}).itcount(),
"Expected to find (0, 1) within $minDistance 1 degree from origin"
);
assert.eq(
1, t.find({loc: {
$nearSphere: legacyPoint,
$minDistance: degreeInRadians - radiansEpsilon
}}).itcount(),
"Expected to find (0, 1) within $minDistance (1 degree - epsilon) from origin"
);
assert.eq(
0, t.find({loc: {
$nearSphere: legacyPoint,
$minDistance: degreeInRadians + radiansEpsilon
}}).itcount(),
"Expected *not* to find (0, 1) within $minDistance (1 degree + epsilon) from origin"
);
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