123 lines
3.7 KiB
JavaScript
123 lines
3.7 KiB
JavaScript
goog.require('ol');
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goog.require('ol.ImageTile');
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goog.require('ol.Tile');
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goog.require('ol.TileState');
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describe('ol.Tile', function() {
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describe('constructor', function() {
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it('sets a default transition', function() {
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var coord = [0, 0, 0];
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var tile = new ol.Tile(coord, ol.TileState.IDLE);
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expect(tile.transition_).to.equal(250);
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});
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it('allows the transition to be set', function() {
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var coord = [0, 0, 0];
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var transition = 500;
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var tile = new ol.Tile(coord, ol.TileState.IDLE, {transition: transition});
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expect(tile.transition_).to.equal(transition);
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});
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});
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describe('#getAlpha()', function() {
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it('returns the alpha value for a tile in transition', function() {
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var coord = [0, 0, 0];
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var tile = new ol.Tile(coord, ol.TileState.IDLE);
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var id = 'test';
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var time = Date.now();
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var startAlpha = tile.getAlpha(id, time);
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expect(startAlpha > 0).to.be(true);
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expect(startAlpha < 1).to.be(true);
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time += tile.transition_ / 2;
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var midAlpha = tile.getAlpha(id, time);
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expect(midAlpha > startAlpha).to.be(true);
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expect(midAlpha < 1).to.be(true);
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time += tile.transition_ / 2;
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var endAlpha = tile.getAlpha(id, time);
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expect(endAlpha).to.be(1);
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});
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});
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describe('#inTransition()', function() {
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it('determines if the tile is in transition', function() {
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var coord = [0, 0, 0];
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var tile = new ol.Tile(coord, ol.TileState.IDLE);
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var id = 'test';
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expect(tile.inTransition(id)).to.be(true);
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tile.endTransition(id);
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expect(tile.inTransition(id)).to.be(false);
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});
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});
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describe('interimChain', function() {
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var head, renderTile;
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beforeEach(function() {
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var tileCoord = [0, 0, 0];
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head = new ol.ImageTile(tileCoord, ol.TileState.IDLE);
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ol.getUid(head);
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var addToChain = function(tile, state) {
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var next = new ol.ImageTile(tileCoord, state);
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ol.getUid(next);
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tile.interimTile = next;
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return next;
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};
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var tail = addToChain(head, ol.TileState.IDLE); //discard, deprecated by head
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tail = addToChain(tail, ol.TileState.LOADING); //keep, request already going
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tail = addToChain(tail, ol.TileState.IDLE); //discard, deprecated by head
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tail = addToChain(tail, ol.TileState.LOADED); //keep, use for rendering
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renderTile = tail; //store this tile for later tests
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tail = addToChain(tail, ol.TileState.IDLE); //rest of list outdated by tile above
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tail = addToChain(tail, ol.TileState.LOADED);
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tail = addToChain(tail, ol.TileState.LOADING);
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tail = addToChain(tail, ol.TileState.LOADED);
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});
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it('shrinks tile chain correctly', function(done) {
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var chainLength = function(tile) {
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var c = 0;
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while (tile) {
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++c;
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tile = tile.interimTile;
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}
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return c;
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};
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expect(chainLength(head)).to.be(9);
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head.refreshInterimChain();
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expect(chainLength(head)).to.be(3);
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done();
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});
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it('gives the right tile to render', function(done) {
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expect(head.getInterimTile()).to.be(renderTile);
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head.refreshInterimChain();
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expect(head.getInterimTile()).to.be(renderTile);
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done();
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});
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it('discards everything after the render tile', function(done) {
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head.refreshInterimChain();
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expect(renderTile.interimTile).to.be(null);
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done();
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});
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it('preserves order of tiles', function(done) {
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head.refreshInterimChain();
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while (head.interimTile !== null) {
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//use property of ol.getUid returning increasing id's.
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expect(ol.getUid(head) < ol.getUid(head.interimTile));
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head = head.interimTile;
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}
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done();
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});
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});
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});
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