fix projection rotation adjustment when more than 180deg

src/geo/projection/adjustments.js

@@ -88,7 +88,7 @@ function getShearAdjustment(projection, zoom, loc, interpT, withoutRotation?: bo
 
  // Calculate how much the map would need to be rotated to make east-west in
  // projected coordinates be left-right
- const angleAdjust = -Math.atan(pdy / pdx);
+ const angleAdjust = -Math.atan2(pdy, pdx);
 
  // Pick a location identical to the original one except for poles to make sure we're within mercator bounds
  const mc2 = MercatorCoordinate.fromLngLat(loc);

test/integration/render-tests/map-projections/rotation-correction-flip/style.json

@@ -0,0 +1,59 @@
+{
+ "version": 8,
+ "metadata": {
+ "test": {
+ "projection": {
+ "name": "albers",
+ "parallels": [90, 90],
+ "center": [10, 30]
+ },
+ "width": 64,
+ "height": 64
+ }
+ },
+ "zoom": 11,
+ "center": [
+ -149.91780281066895,
+ 61.191643168038084
+ ],
+ "sources": {
+ "geojson": {
+ "type": "geojson",
+ "data": {
+ "type": "Polygon",
+ "coordinates": [
+ [
+ [
+ -149.92052793502808,
+ 61.18806530594994
+ ],
+ [
+ -149.91771697998047,
+ 61.18877884266747
+ ],
+ [
+ -149.9149489402771,
+ 61.188054964719335
+ ],
+ [
+ -149.91780281066895,
+ 61.191643168038084
+ ],
+ [
+ -149.92052793502808,
+ 61.18806530594994
+ ]
+ ]
+ ]
+ }
+ }
+ },
+ "sprite": "local://sprites/sprite",
+ "layers": [
+ {
+ "id": "fill",
+ "type": "fill",
+ "source": "geojson"
+ }
+ ]
+}