From dfd40b27a54115cdf769abdda3ec4d3a1329758c Mon Sep 17 00:00:00 2001
From: Jesse Bounds <jesse@rebounds.net>
Date: Tue, 16 Aug 2016 15:04:12 -0700
Subject: [PATCH] [tests] Add tests for shape overlays crossing the
 antimeridian

This adds two tests:

AntimeridianAnnotationSmall: Test that a shape that is represented with
+-180 longitudinal values is drawn spanning the antimeridian. In other
words, it is rendered as a "small" shape as opposed to one that spans
around the world to reach the other side of the antimeridian. This test
is currently failing at the time of this commit.

AntimeridianAnnotationLarge: Test that a shape that is represented with
points that do not cross the +-180 boundary is rendered as a "large"
shape. In other words, it is rendered by wrapping around the world to
reach the other side of the meridian. This test is currently passing at
the time of this commit.
---
 test/api/annotations.cpp                      |  42 ++++++++++++++++++
 .../expected.png                              | Bin 0 -> 1579 bytes
 .../expected.png                              | Bin 0 -> 1652 bytes
 3 files changed, 42 insertions(+)
 create mode 100644 test/fixtures/annotations/antimeridian_annotation_large/expected.png
 create mode 100644 test/fixtures/annotations/antimeridian_annotation_small/expected.png

diff --git a/test/api/annotations.cpp b/test/api/annotations.cpp
index 9ec449758..b6f861f90 100644
--- a/test/api/annotations.cpp
+++ b/test/api/annotations.cpp
@@ -79,6 +79,48 @@ TEST(Annotations, FillAnnotation) {
     test.checkRendering("fill_annotation_max_zoom");
 }
 
+TEST(Annotations, AntimeridianAnnotationSmall) {
+    AnnotationTest test;
+
+    double antimeridian = 180;
+    test.map.setLatLngZoom(mbgl::LatLng(0, antimeridian), 0);
+    test.map.setStyleJSON(util::read_file("test/fixtures/api/empty.json"));
+
+    LineString<double> line = {{ { antimeridian, 20 }, { antimeridian, -20 } }};
+    LineAnnotation lineAnnotation { line };
+    lineAnnotation.color = { { 255, 0, 0, 1 } };
+    lineAnnotation.width = { 2 };
+    test.map.addAnnotation(lineAnnotation);
+
+    Polygon<double> polygon = {{ {{ { antimeridian+10, 0 }, { antimeridian - 10, 10 }, { antimeridian-10, -10 } }} }};
+    FillAnnotation polygonAnnotation { polygon };
+    polygonAnnotation.color = { { 0, 0, 255, 1 } };
+    test.map.addAnnotation(polygonAnnotation);
+
+    test.checkRendering("antimeridian_annotation_small");
+}
+
+TEST(Annotations, AntimeridianAnnotationLarge) {
+    AnnotationTest test;
+
+    double antimeridian = 180;
+    test.map.setLatLngZoom(mbgl::LatLng(0, antimeridian), 0);
+    test.map.setStyleJSON(util::read_file("test/fixtures/api/empty.json"));
+
+    LineString<double> line = {{ { antimeridian, 20 }, { antimeridian, -20 } }};
+    LineAnnotation lineAnnotation { line };
+    lineAnnotation.color = { { 255, 0, 0, 1 } };
+    lineAnnotation.width = { 2 };
+    test.map.addAnnotation(lineAnnotation);
+
+    Polygon<double> polygon = {{ {{ { antimeridian-10, 0 }, { -antimeridian+10, 10 }, { -antimeridian+10, -10 } }} }};
+    FillAnnotation polygonAnnotation { polygon };
+    polygonAnnotation.color = { { 0, 0, 255, 1 } };
+    test.map.addAnnotation(polygonAnnotation);
+
+    test.checkRendering("antimeridian_annotation_large");
+}
+
 TEST(Annotations, OverlappingFillAnnotation) {
     AnnotationTest test;
 
diff --git a/test/fixtures/annotations/antimeridian_annotation_large/expected.png b/test/fixtures/annotations/antimeridian_annotation_large/expected.png
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diff --git a/test/fixtures/annotations/antimeridian_annotation_small/expected.png b/test/fixtures/annotations/antimeridian_annotation_small/expected.png
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