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Ensure that tile range covers all pixels

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This commit is contained in:
Tim Schaub
2021-12-23 17:10:59 -07:00
parent 45c38eabc4
commit 2d510e71a9
5 changed files with 131 additions and 24 deletions
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42
test/node/ol/tilegrid/TileGrid.test.js
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@@ -823,14 +823,14 @@ describe('ol/tilegrid/TileGrid.js', function () {
expect(tileCoord[2]).to.eql(1);
// pixels are top aligned to the origin
coordinate = [1280, -2559.999];
coordinate = [1280, -2549.999];
tileCoord = tileGrid.getTileCoordForCoordAndResolution(coordinate, 10);
expect(tileCoord[0]).to.eql(0);
expect(tileCoord[1]).to.eql(0);
expect(tileCoord[2]).to.eql(0);
// pixels are left aligned to the origin
coordinate = [2559.999, -1280];
coordinate = [2549.999, -1280];
tileCoord = tileGrid.getTileCoordForCoordAndResolution(coordinate, 10);
expect(tileCoord[0]).to.eql(0);
expect(tileCoord[1]).to.eql(0);
@@ -947,6 +947,44 @@ describe('ol/tilegrid/TileGrid.js', function () {
});
describe('getTileRangeForExtentAndZ', function () {
it('includes a tile even if a fraction of a pixel is covered', function () {
const tileGrid = new TileGrid({
resolutions: [1],
origin: [0, 10],
tileSize: 10,
});
let tileRange;
// overlaps to the right
tileRange = tileGrid.getTileRangeForExtentAndZ([0, 0, 10.1, 10], 0);
expect(tileRange.minX).to.be(0);
expect(tileRange.maxX).to.be(1);
expect(tileRange.minY).to.be(0);
expect(tileRange.maxY).to.be(0);
// overlaps to the bottom
tileRange = tileGrid.getTileRangeForExtentAndZ([0, -0.1, 10, 10], 0);
expect(tileRange.minX).to.be(0);
expect(tileRange.maxX).to.be(0);
expect(tileRange.minY).to.be(0);
expect(tileRange.maxY).to.be(1);
// overlaps to the left
tileRange = tileGrid.getTileRangeForExtentAndZ([-0.1, 0, 10, 10], 0);
expect(tileRange.minX).to.be(-1);
expect(tileRange.maxX).to.be(0);
expect(tileRange.minY).to.be(0);
expect(tileRange.maxY).to.be(0);
// overlaps to the top
tileRange = tileGrid.getTileRangeForExtentAndZ([0, 0, 10, 10.1], 0);
expect(tileRange.minX).to.be(0);
expect(tileRange.maxX).to.be(0);
expect(tileRange.minY).to.be(-1);
expect(tileRange.maxY).to.be(0);
});
it('returns the expected TileRange', function () {
const tileGrid = new TileGrid({
resolutions: resolutions,