Skip points with NaNs in point_in_path and friends

Author: mdboom

lib/matplotlib/tests/test_path.py

@@ -61,6 +61,13 @@ def test_path_clipping():
             xy, facecolor='none', edgecolor='red', closed=True))
 
 
+def test_point_in_path_nan():
+    box = np.array([[0, 0], [1, 0], [1, 1], [0, 1], [0, 0]])
+    p = Path(box)
+    test = np.array([[np.nan, 0.5]])
+    assert p.contains_points(test)[0] == False
+
+
 if __name__ == '__main__':
     import nose
     nose.runmodule(argv=['-s', '--with-doctest'], exit=False)

src/_path.cpp

@@ -165,10 +165,12 @@ point_in_path_impl(const void* const points_, const size_t s0,
         for (i = 0; i < n; ++i) {
             ty = *(double *)(points + s0 * i + s1);
 
-            // get test bit for above/below X axis
-            yflag0[i] = (vty0 >= ty);
+            if (MPL_isfinite64(ty)) {
+                // get test bit for above/below X axis
+                yflag0[i] = (vty0 >= ty);
 
-            subpath_flag[i] = 0;
+                subpath_flag[i] = 0;
+            }
         }
 
         do
@@ -191,6 +193,10 @@ point_in_path_impl(const void* const points_, const size_t s0,
                 tx = *(double *)(points + s0 * i);
                 ty = *(double *)(points + s0 * i + s1);
 
+                if (MPL_notisfinite64(tx) || MPL_notisfinite64(ty)) {
+                    continue;
+                }
+
                 yflag1 = (vty1 >= ty);
                 // Check if endpoints straddle (are on opposite sides) of
                 // X axis (i.e. the Y's differ); if so, +X ray could
@@ -237,6 +243,10 @@ point_in_path_impl(const void* const points_, const size_t s0,
             tx = *(double *)(points + s0 * i);
             ty = *(double *)(points + s0 * i + s1);
 
+            if (MPL_notisfinite64(tx) || MPL_notisfinite64(ty)) {
+                continue;
+            }
+
             yflag1 = (vty1 >= ty);
             if (yflag0[i] != yflag1) {
                 if (((vty1 - ty) * (vtx0 - vtx1) >=