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Estimate point resolution for Proj4js projections

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This commit is contained in:
Tom Payne
2013-03-03 17:19:18 +01:00
parent 343768df6a
commit a8760108d4
2 changed files with 70 additions and 0 deletions
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30
test/spec/ol/projection.test.js
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@@ -144,6 +144,36 @@ describe('ol.projection', function() {
expect(point.y).toRoughlyEqual(200146.976, 1);
});
it('numerically estimates point scale at the equator', function() {
var googleProjection = ol.projection.getFromCode('GOOGLE');
expect(googleProjection.getPointResolution(1, new ol.Coordinate(0, 0))).
toRoughlyEqual(1, 1e-1);
});
it('numerically estimates point scale at various latitudes', function() {
var epsg3857Projection = ol.projection.getFromCode('EPSG:3857');
var googleProjection = ol.projection.getFromCode('GOOGLE');
var point, y;
for (y = -20; y <= 20; ++y) {
point = new ol.Coordinate(0, 1000000 * y);
expect(googleProjection.getPointResolution(1, point)).toRoughlyEqual(
epsg3857Projection.getPointResolution(1, point), 1e-1);
}
});
it('numerically estimates point scale at various points', function() {
var epsg3857Projection = ol.projection.getFromCode('EPSG:3857');
var googleProjection = ol.projection.getFromCode('GOOGLE');
var point, x, y;
for (x = -20; x <= 20; ++x) {
for (y = -20; y <= 20; ++y) {
point = new ol.Coordinate(1000000 * x, 1000000 * y);
expect(googleProjection.getPointResolution(1, point)).toRoughlyEqual(
epsg3857Projection.getPointResolution(1, point), 1e-1);
}
}
});
});
describe('ol.projection.getTransform()', function() {