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Merge pull request #207 from tschaub/tilerange

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Make tile range calculation consistent.  Tile ranges are always inclusive in their min/max values.
This commit is contained in:
Tim Schaub
2013-02-19 07:43:27 -08:00
parent a55a6bda3b 5148ad038c
commit 1f4b34cdb8
4 changed files with 208 additions and 114 deletions
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168
test/spec/ol/tilegrid.test.js
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@@ -289,11 +289,11 @@ describe('ol.tilegrid.TileGrid', function() {
});
});
describe('getTileCoordForCoordAndResolution fractional', function() {
it('returns the expected TileCoord', function() {
var tileSize = new ol.Size(256, 256);
describe('getTileCoordForCoordAndResolution_', function() {
it('returns higher tile coord for intersections by default', function() {
var tileGrid = new ol.tilegrid.TileGrid({
resolutions: [1 / 3],
resolutions: resolutions,
extent: extent,
origin: origin,
tileSize: tileSize
@@ -302,91 +302,53 @@ describe('ol.tilegrid.TileGrid', function() {
var coordinate;
var tileCoord;
// These tests render at a resolution of 1. Because the layer's
// closest resolution is 1/3, the images are scaled by 1/3.
// In this scenario, every third tile will be one pixel wider when
// rendered (0,0 is normal; 1,0 is wider; 0,1 is taller; etc.)
// gets the first tile at the origin
// gets higher tile for edge intersection
coordinate = new ol.Coordinate(0, 0);
tileCoord = tileGrid.getTileCoordForCoordAndResolution(
coordinate, 1);
expect(tileCoord.z).toEqual(0);
tileCoord = tileGrid.getTileCoordForCoordAndResolution_(
coordinate, 100);
expect(tileCoord.z).toEqual(3);
expect(tileCoord.x).toEqual(0);
expect(tileCoord.y).toEqual(0);
// gets the 1,0 tile at 256/3,0
coordinate = new ol.Coordinate(256 / 3, 0);
tileCoord = tileGrid.getTileCoordForCoordAndResolution(
coordinate, 1);
expect(tileCoord.z).toEqual(0);
expect(tileCoord.x).toEqual(1);
expect(tileCoord.y).toEqual(0);
// gets higher tile for edge intersection
coordinate = new ol.Coordinate(100000, 100000);
tileCoord = tileGrid.getTileCoordForCoordAndResolution_(
coordinate, 100);
expect(tileCoord.z).toEqual(3);
expect(tileCoord.x).toEqual(10);
expect(tileCoord.y).toEqual(10);
// still gets the 1,0 tile at 512/3,0 - wider tile
coordinate = new ol.Coordinate(512 / 3, 0);
tileCoord = tileGrid.getTileCoordForCoordAndResolution(
coordinate, 1);
expect(tileCoord.z).toEqual(0);
expect(tileCoord.x).toEqual(1);
expect(tileCoord.y).toEqual(0);
// gets the 2,0 tile at 513/3,0
coordinate = new ol.Coordinate(513 / 3, 0);
tileCoord = tileGrid.getTileCoordForCoordAndResolution(
coordinate, 1);
expect(tileCoord.z).toEqual(0);
expect(tileCoord.x).toEqual(2);
expect(tileCoord.y).toEqual(0);
// gets the 3,0 tile at 768/3,0
coordinate = new ol.Coordinate(768 / 3, 0);
tileCoord = tileGrid.getTileCoordForCoordAndResolution(
coordinate, 1);
expect(tileCoord.z).toEqual(0);
expect(tileCoord.x).toEqual(3);
expect(tileCoord.y).toEqual(0);
// gets the 4,0 tile at 1024/3,0
coordinate = new ol.Coordinate(1024 / 3, 0);
tileCoord = tileGrid.getTileCoordForCoordAndResolution(
coordinate, 1);
expect(tileCoord.z).toEqual(0);
expect(tileCoord.x).toEqual(4);
expect(tileCoord.y).toEqual(0);
// still gets the 4,0 tile at 1280/3,0 - wider tile
coordinate = new ol.Coordinate(1280 / 3, 0);
tileCoord = tileGrid.getTileCoordForCoordAndResolution(
coordinate, 1);
expect(tileCoord.z).toEqual(0);
expect(tileCoord.x).toEqual(4);
expect(tileCoord.y).toEqual(0);
// gets the 5,0 tile at 1281/3,0
coordinate = new ol.Coordinate(1281 / 3, 0);
tileCoord = tileGrid.getTileCoordForCoordAndResolution(
coordinate, 1);
expect(tileCoord.z).toEqual(0);
expect(tileCoord.x).toEqual(5);
expect(tileCoord.y).toEqual(0);
// gets the 0,1 tile at 0,-256/3
coordinate = new ol.Coordinate(0, -256 / 3);
tileCoord = tileGrid.getTileCoordForCoordAndResolution(
coordinate, 1);
expect(tileCoord.z).toEqual(0);
expect(tileCoord.x).toEqual(0);
expect(tileCoord.y).toEqual(-2);
// still gets the 0,1 tile at 0,-512/3 - taller tile
coordinate = new ol.Coordinate(0, -512 / 3);
tileCoord = tileGrid.getTileCoordForCoordAndResolution(
coordinate, 1);
expect(tileCoord.z).toEqual(0);
expect(tileCoord.x).toEqual(0);
expect(tileCoord.y).toEqual(-2);
});
it('handles alt intersection policy', function() {
var tileGrid = new ol.tilegrid.TileGrid({
resolutions: resolutions,
extent: extent,
origin: origin,
tileSize: tileSize
});
var coordinate;
var tileCoord;
// can get lower tile for edge intersection
coordinate = new ol.Coordinate(0, 0);
tileCoord = tileGrid.getTileCoordForCoordAndResolution_(
coordinate, 100, true);
expect(tileCoord.z).toEqual(3);
expect(tileCoord.x).toEqual(-1);
expect(tileCoord.y).toEqual(-1);
// gets higher tile for edge intersection
coordinate = new ol.Coordinate(100000, 100000);
tileCoord = tileGrid.getTileCoordForCoordAndResolution_(
coordinate, 100, true);
expect(tileCoord.z).toEqual(3);
expect(tileCoord.x).toEqual(9);
expect(tileCoord.y).toEqual(9);
});
});
describe('getTileCoordCenter', function() {
@@ -443,6 +405,46 @@ describe('ol.tilegrid.TileGrid', function() {
});
});
describe('getTileRangeForExtentAndResolution', function() {
it('returns the expected TileRange', function() {
var tileGrid = new ol.tilegrid.TileGrid({
resolutions: resolutions,
extent: extent,
origin: origin,
tileSize: tileSize
});
var tileRange;
tileRange = tileGrid.getTileRangeForExtentAndResolution(extent,
resolutions[0]);
expect(tileRange.minY).toEqual(0);
expect(tileRange.minX).toEqual(0);
expect(tileRange.maxX).toEqual(0);
expect(tileRange.maxY).toEqual(0);
tileRange = tileGrid.getTileRangeForExtentAndResolution(extent,
resolutions[1]);
expect(tileRange.minX).toEqual(0);
expect(tileRange.minY).toEqual(0);
expect(tileRange.maxX).toEqual(1);
expect(tileRange.maxY).toEqual(1);
tileRange = tileGrid.getTileRangeForExtentAndResolution(extent,
resolutions[2]);
expect(tileRange.minX).toEqual(0);
expect(tileRange.minY).toEqual(0);
expect(tileRange.maxX).toEqual(3);
expect(tileRange.maxY).toEqual(3);
tileRange = tileGrid.getTileRangeForExtentAndResolution(extent,
resolutions[3]);
expect(tileRange.minX).toEqual(0);
expect(tileRange.minY).toEqual(0);
expect(tileRange.maxX).toEqual(9);
expect(tileRange.maxY).toEqual(9);
});
});
describe('getTileRangeForExtentAndZ', function() {
it('returns the expected TileRange', function() {
var tileGrid = new ol.tilegrid.TileGrid({