fix band indexing with negative tuple elements

backport to 0.7.x
fortyninemaps · Oct 8, 2016 · 171b5d9 · 171b5d9
1 parent 238a9eb
commit 171b5d9
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/karta/raster/band.py b/karta/raster/band.py
@@ -191,7 +191,7 @@ def __getitem__(self, key):
             kr, kc = key
 
             if isinstance(kr, Integral):
-                yoff = kr
+                yoff = kr % self.size[0]
                 ny = 1
                 ystride = 1
 
@@ -207,7 +207,7 @@ def __getitem__(self, key):
                                  "supported".format(type(kr)))
 
             if isinstance(kc, Integral):
-                xoff = kc
+                xoff = kc % self.size[1]
                 nx = 1
                 xstride = 1
 

diff --git a/tests/band_tests.py b/tests/band_tests.py
@@ -52,6 +52,8 @@ def test_get_scalar(self):
 
         self.assertEqual(band[4,3], 11.0)
         self.assertTrue(band[4:5,3:4].shape, (1, 1))
+        self.assertEqual(band[-1,-1], d[-1,-1])
+        return
 
     def test_initval(self):
         band = self.type((1024, 1024), np.float64, initval=0.0)