fix: Use np.ptp instad of .ptp. Closes #360

Author: daavoo

src/pyntcloud/plot/matplotlib_backend.py

@@ -22,7 +22,7 @@ def plot_with_matplotlib(cloud, **kwargs):
 
     colors = get_colors(cloud, kwargs["use_as_color"], kwargs["cmap"])
 
-    ptp = cloud.xyz.ptp()
+    ptp = np.ptp(cloud.xyz)
 
     plt.figure(figsize=(10, 10))
     ax = plt.axes(projection='3d')

src/pyntcloud/plot/pythreejs_backend.py

@@ -69,7 +69,7 @@ def plot_with_pythreejs(cloud, **kwargs):
 
     colors = get_colors(cloud, kwargs["use_as_color"], kwargs["cmap"])
 
-    ptp = cloud.xyz.ptp()
+    ptp = np.ptp(cloud.xyz)
 
     children = []
     widgets = []

src/pyntcloud/structures/voxelgrid.py

@@ -77,7 +77,7 @@ def compute(self):
         """ABC API."""
         xyzmin = self._points.min(0)
         xyzmax = self._points.max(0)
-        xyz_range = self._points.ptp(0)
+        xyz_range = np.ptp(self._points, 0)
 
         if self.regular_bounding_box:
             #: adjust to obtain a minimum bounding box with all sides of equal length
@@ -88,7 +88,7 @@ def compute(self):
         for n, size in enumerate(self.sizes):
             if size is None:
                 continue
-            margin = (((self._points.ptp(0)[n] // size) + 1) * size) - self._points.ptp(0)[n]
+            margin = (((xyz_range[n] // size) + 1) * size) - xyz_range[n]
             xyzmin[n] -= margin / 2
             xyzmax[n] += margin / 2
             self.x_y_z[n] = ((xyzmax[n] - xyzmin[n]) / size).astype(int)