add Point <--> LatLng conversion tests

1 files changed, 32 insertions, 0 deletions

diff --git a/test/miscellaneous/transform.cpp b/test/miscellaneous/transform.cpp
index 5d00bfd20b..426e9e534d 100644
--- a/test/miscellaneous/transform.cpp
+++ b/test/miscellaneous/transform.cpp
@@ -105,3 +105,35 @@ TEST(Transform, InvalidBearing) {
     ASSERT_DOUBLE_EQ(2, transform.getScale());
     ASSERT_DOUBLE_EQ(2, transform.getAngle());
 }
+
+TEST(Transform, PerspectiveProjection) {
+    MockView view;
+    Transform transform(view);
+
+    transform.resize({{ 1000, 1000 }});
+    transform.setScale(1024);
+    transform.setPitch(0.9);
+    transform.setLatLng(LatLng(38, -77));
+
+    // expected values are from mapbox-gl-js
+
+    LatLng loc = transform.getState().pointToLatLng({ 500, 500 });
+    ASSERT_NEAR(-77, loc.longitude, 0.0001);
+    ASSERT_NEAR(38, loc.latitude, 0.0001);
+
+    loc = transform.getState().pointToLatLng({ 0, 1000 });
+    ASSERT_NEAR(-77.59198961199148, loc.longitude, 0.0002);
+    ASSERT_NEAR(38.74661326302018, loc.latitude, 0.0001);
+
+    loc = transform.getState().pointToLatLng({ 1000, 0 });
+    ASSERT_NEAR(-76.75823239205641, loc.longitude, 0.0001);
+    ASSERT_NEAR(37.692872969426375, loc.latitude, 0.0001);
+
+    vec2<double> point = transform.getState().latLngToPoint({38.74661326302018, -77.59198961199148});
+    ASSERT_NEAR(point.x, 0, 0.01);
+    ASSERT_NEAR(point.y, 1000, 0.01);
+
+    point = transform.getState().latLngToPoint({37.692872969426375, -76.75823239205641});
+    ASSERT_NEAR(point.x, 1000, 0.02);
+    ASSERT_NEAR(point.y, 0, 0.02);
+}