8317317127
When we have only a single point, we want to make sure it gets added (fixes #1821). Because this code doesn't differentiate coordinates that are part of a linestring or linearring from those that are independent points, we always add the first segment (or pair of points). In addition, coordinates for segments are appended whenever they represent a change in relationship with respect to the extent. This keeps the code simpler for handling fills and properly capturing intersection points for linestrings. This could be modified to save a few extra coordinates, but it provides for simpler code at a very minimal cost.
82 lines
2.9 KiB
JavaScript
82 lines
2.9 KiB
JavaScript
goog.provide('ol.test.renderer.canvas.Replay');
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describe('ol.render.canvas.Replay', function() {
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describe('constructor', function() {
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it('creates a new replay batch', function() {
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var tolerance = 10;
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var extent = [-180, -90, 180, 90];
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var replay = new ol.render.canvas.Replay(tolerance, extent);
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expect(replay).to.be.a(ol.render.canvas.Replay);
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});
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});
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describe('#appendFlatCoordinates()', function() {
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var replay;
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beforeEach(function() {
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replay = new ol.render.canvas.Replay(1, [-180, -90, 180, 90]);
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});
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it('appends coordinates that are within the max extent', function() {
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var flat = [-110, 45, 110, 45, 110, -45, -110, -45];
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replay.appendFlatCoordinates(flat, 0, flat.length, 2, false);
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expect(replay.coordinates).to.eql(flat);
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});
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it('works with a single coordinate (inside)', function() {
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var flat = [-110, 45];
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replay.appendFlatCoordinates(flat, 0, flat.length, 2, false);
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expect(replay.coordinates).to.eql(flat);
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});
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it('always appends first point (even if outside)', function() {
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// this could be changed, but to make the code simpler for properly
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// closing rings, we always add the first point
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var flat = [-110, 145];
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replay.appendFlatCoordinates(flat, 0, flat.length, 2, false);
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expect(replay.coordinates).to.eql(flat);
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});
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it('appends points when segments cross (top to bottom)', function() {
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// this means we get a few extra points when coordinates are not
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// part of a linestring or ring, but only a few extra
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var flat = [0, 200, 0, -200];
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replay.appendFlatCoordinates(flat, 0, flat.length, 2, false);
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expect(replay.coordinates).to.eql(flat);
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});
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it('appends points when segments cross (top to inside)', function() {
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var flat = [0, 200, 0, 0];
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replay.appendFlatCoordinates(flat, 0, flat.length, 2, false);
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expect(replay.coordinates).to.eql(flat);
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});
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it('always appends the first segment (even when outside)', function() {
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// this could be changed, but to make the code simpler for properly
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// closing rings, we always add the first segment
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var flat = [-10, 200, 10, 200];
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replay.appendFlatCoordinates(flat, 0, flat.length, 2, false);
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expect(replay.coordinates).to.eql(flat);
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});
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it('eliminates segments outside (and not changing rel)', function() {
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var flat = [0, 0, 0, 200, 10, 200];
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replay.appendFlatCoordinates(flat, 0, flat.length, 2, false);
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expect(replay.coordinates).to.eql([0, 0, 0, 200]);
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});
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it('includes outside segments that change relationship', function() {
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var flat = [0, 0, 0, 200, 200, 200, 250, 200];
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replay.appendFlatCoordinates(flat, 0, flat.length, 2, false);
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expect(replay.coordinates).to.eql([0, 0, 0, 200, 200, 200]);
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});
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});
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});
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goog.require('ol.render.canvas.Replay');
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