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Function for creating tile grids from extents

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This commit is contained in:
Tim Schaub
2013-10-11 17:21:10 -06:00
parent dd5e7693da
commit 63ad916ca7
2 changed files with 107 additions and 15 deletions
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60
test/spec/ol/tilegrid/tilegrid.test.js
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@@ -161,6 +161,18 @@ describe('ol.tilegrid.TileGrid', function() {
});
});
describe('createForExtent', function() {
it('allows creation of tile grid from extent', function() {
var extent = ol.extent.createOrUpdate(-100, -100, 100, 100);
var grid = ol.tilegrid.createForExtent(extent);
expect(grid).to.be.a(ol.tilegrid.TileGrid);
var resolutions = grid.getResolutions();
expect(resolutions.length).to.be(ol.DEFAULT_MAX_ZOOM + 1);
expect(grid.getOrigin()).to.eql([-100, -100]);
});
});
describe('createForProjection', function() {
it('allows easier creation of a tile grid', function() {
@@ -200,6 +212,50 @@ describe('ol.tilegrid.TileGrid', function() {
ol.DEFAULT_TILE_SIZE / Math.pow(2, 5));
});
it('assumes origin is bottom-left', function() {
var projection = ol.proj.get('EPSG:3857');
var grid = ol.tilegrid.createForProjection(projection);
var origin = grid.getOrigin();
var half = ol.proj.EPSG3857.HALF_SIZE;
expect(origin).to.eql([-half, -half]);
});
it('accepts bottom-left as corner', function() {
var projection = ol.proj.get('EPSG:3857');
var grid = ol.tilegrid.createForProjection(
projection, undefined, undefined, ol.extent.Corner.BOTTOM_LEFT);
var origin = grid.getOrigin();
var half = ol.proj.EPSG3857.HALF_SIZE;
expect(origin).to.eql([-half, -half]);
});
it('accepts bottom-right as corner', function() {
var projection = ol.proj.get('EPSG:3857');
var grid = ol.tilegrid.createForProjection(
projection, undefined, undefined, ol.extent.Corner.BOTTOM_RIGHT);
var origin = grid.getOrigin();
var half = ol.proj.EPSG3857.HALF_SIZE;
expect(origin).to.eql([half, -half]);
});
it('accepts top-left as corner', function() {
var projection = ol.proj.get('EPSG:3857');
var grid = ol.tilegrid.createForProjection(
projection, undefined, undefined, ol.extent.Corner.TOP_LEFT);
var origin = grid.getOrigin();
var half = ol.proj.EPSG3857.HALF_SIZE;
expect(origin).to.eql([-half, half]);
});
it('accepts top-right as corner', function() {
var projection = ol.proj.get('EPSG:3857');
var grid = ol.tilegrid.createForProjection(
projection, undefined, undefined, ol.extent.Corner.TOP_RIGHT);
var origin = grid.getOrigin();
var half = ol.proj.EPSG3857.HALF_SIZE;
expect(origin).to.eql([half, half]);
});
});
describe('getForProjection', function() {
@@ -643,8 +699,12 @@ describe('ol.tilegrid.TileGrid', function() {
});
goog.require('ol.Coordinate');
goog.require('ol.extent');
goog.require('ol.extent.Corner');
goog.require('ol.proj');
goog.require('ol.proj.METERS_PER_UNIT');
goog.require('ol.proj');
goog.require('ol.proj.EPSG3857');
goog.require('ol.proj.Projection');
goog.require('ol.proj.Units');
goog.require('ol.tilegrid.TileGrid');