Add proj_degree_input() and proj_degree_output()

Equivalent to proj_angular_input() and proj_angular_output() but
checking for degree units instead. proj_create_crs_to_crs() rarely, if
ever, returns pipelines that has radians as input or output so using
proj_angular_*() is not a useful check for io units of pipelines.

These two new functions should make life a bit easier for users that
generally store there angular coordinates in radians.

Closes #2027

1 files changed, 19 insertions, 0 deletions

diff --git a/test/unit/proj_angular_io_test.cpp b/test/unit/proj_angular_io_test.cpp
index dbf09986..30eae298 100644
--- a/test/unit/proj_angular_io_test.cpp
+++ b/test/unit/proj_angular_io_test.cpp
@@ -98,4 +98,23 @@ TEST(AngularUnits, Pipelines3) {
     proj_context_destroy(ctx);
 }
 
+TEST(AngularUnits, Degrees) {
+    auto ctx = proj_context_create();
+    auto P = proj_create(
+        ctx,
+        "+proj=pipeline "
+        "+step +inv +proj=utm +zone=32 +ellps=GRS80 "
+        "+step +proj=unitconvert +xy_in=rad +xy_out=deg "
+    );
+
+    EXPECT_FALSE(proj_degree_input(P, PJ_FWD));
+    EXPECT_TRUE(proj_degree_input(P, PJ_INV));
+    EXPECT_TRUE(proj_degree_output(P, PJ_FWD));
+    EXPECT_FALSE(proj_degree_output(P, PJ_INV));
+
+    proj_destroy(P);
+    proj_context_destroy(ctx);
+
+}
+
 } // namespace