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var t = db.geo_s2intersectinglines
t.drop()
t.ensureIndex( { geo : "2dsphere" } );
/* All the tests in this file are generally confirming intersections based upon
* these three geo objects.
*/
var canonLine = {
name: 'canonLine',
geo: {
type: "LineString",
coordinates: [[0.0, 0.0], [1.0, 0.0]]
}
};
var canonPoint = {
name: 'canonPoint',
geo: {
type: "Point",
coordinates: [10.0, 10.0]
}
};
var canonPoly = {
name: 'canonPoly',
geo: {
type: "Polygon",
coordinates: [
[[50.0, 50.0], [51.0, 50.0], [51.0, 51.0], [50.0, 51.0], [50.0, 50.0]]
]
}
};
t.insert(canonLine);
t.insert(canonPoint);
t.insert(canonPoly);
//Case 1: Basic sanity intersection.
var testLine = {type: "LineString",
coordinates: [[0.5, 0.5], [0.5, -0.5]]};
var result = t.find({geo: {$geoIntersects: {$geometry: testLine}}});
assert.eq(result.count(), 1);
assert.eq(result[0]['name'], 'canonLine');
//Case 2: Basic Polygon intersection.
// we expect that the canonLine should intersect with this polygon.
var testPoly = {type: "Polygon",
coordinates: [
[[0.4, -0.1],[0.4, 0.1], [0.6, 0.1], [0.6, -0.1], [0.4, -0.1]]
]}
result = t.find({geo: {$geoIntersects: {$geometry: testPoly}}});
assert.eq(result.count(), 1);
assert.eq(result[0]['name'], 'canonLine');
//Case 3: Intersects the vertex of a line.
// When a line intersects the vertex of a line, we expect this to
// count as a geoIntersection.
testLine = {type: "LineString",
coordinates: [[0.0, 0.5], [0.0, -0.5]]};
result = t.find({geo: {$geoIntersects: {$geometry: testLine}}});
assert.eq(result.count(), 1);
assert.eq(result[0]['name'], 'canonLine');
// Case 4: Sanity no intersection.
// This line just misses the canonLine in the negative direction. This
// should not count as a geoIntersection.
testLine = {type: "LineString",
coordinates: [[-0.1, 0.5], [-0.1, -0.5]]};
result = t.find({geo: {$geoIntersects: {$geometry: testLine}}});
assert.eq(result.count(), 0);
// Case 5: Overlapping line - only partially overlaps.
// Undefined behaviour: does intersect
testLine = {type: "LineString",
coordinates: [[-0.5, 0.0], [0.5, 0.0]]};
var result = t.find({geo: {$geoIntersects: {$geometry: testLine}}});
assert.eq(result.count(), 1);
assert.eq(result[0]['name'], 'canonLine');
// Case 6: Contained line - this line is fully contained by the canonLine
// Undefined behaviour: doesn't intersect.
testLine = {type: "LineString",
coordinates: [[0.1, 0.0], [0.9, 0.0]]};
result = t.find({geo: {$geoIntersects: {$geometry: testLine}}});
assert.eq(result.count(), 0);
// Case 7: Identical line in the identical position.
// Undefined behaviour: does intersect.
testLine = {type: "LineString",
coordinates: [[0.0, 0.0], [1.0, 0.0]]};
result = t.find({geo: {$geoIntersects: {$geometry: testLine}}});
assert.eq(result.count(), 1);
assert.eq(result[0]['name'], 'canonLine');
// Case 8: Point intersection - we search with a line that intersects
// with the canonPoint.
testLine = {type: "LineString",
coordinates: [[10.0, 11.0], [10.0, 9.0]]};
result = t.find({geo: {$geoIntersects: {$geometry: testLine}}});
assert.eq(result.count(), 1);
assert.eq(result[0]['name'], 'canonPoint');
// Case 9: Point point intersection
// as above but with an identical point to the canonPoint. We expect an
// intersection here.
testPoint = {type: "Point",
coordinates: [10.0, 10.0]}
result = t.find({geo: {$geoIntersects: {$geometry: testPoint}}});
assert.eq(result.count(), 1);
assert.eq(result[0]['name'], 'canonPoint');
//Case 10: Sanity point non-intersection.
var testPoint = {type: "Point",
coordinates: [12.0, 12.0]}
result = t.find({geo: {$geoIntersects: {$geometry: testPoint}}});
assert.eq(result.count(), 0);
// Case 11: Point polygon intersection
// verify that a point inside a polygon $geoIntersects.
testPoint = {type: "Point",
coordinates: [50.5, 50.5]}
result = t.find({geo: {$geoIntersects: {$geometry: testPoint}}});
assert.eq(result.count(), 1);
assert.eq(result[0]['name'], 'canonPoly');
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