Cleaned up python tutorials and added dependency checks to all tutorials

Former-commit-id: 246017f041

python/tutorial/302_Sort.py

@@ -1,35 +1,41 @@
-# Add the igl library to the modules search path
 import sys, os
-sys.path.insert(0, os.getcwd() + "/../")
 
+# Add the igl library to the modules search path
+sys.path.insert(0, os.getcwd() + "/../")
 import pyigl as igl
 
+from shared import TUTORIAL_SHARED_PATH, check_dependencies
+
+dependencies = ["viewer"]
+check_dependencies(dependencies)
+
+
 V = igl.eigen.MatrixXd()
 F = igl.eigen.MatrixXi()
 
-igl.readOFF("../../tutorial/shared/decimated-knight.off",V,F)
+igl.readOFF(TUTORIAL_SHARED_PATH + "decimated-knight.off", V, F)
 
 # Sort barycenters lexicographically
 BC = igl.eigen.MatrixXd()
 sorted_BC = igl.eigen.MatrixXd()
 
-igl.barycenter(V,F,BC);
+igl.barycenter(V, F, BC)
 
 I = igl.eigen.MatrixXi()
 J = igl.eigen.MatrixXi()
 
 # sorted_BC = BC(I,:)
-igl.sortrows(BC,True,sorted_BC,I)
+igl.sortrows(BC, True, sorted_BC, I)
 
 # Get sorted "place" from sorted indices
-J.resize(I.rows(),1)
+J.resize(I.rows(), 1)
 # J(I) = 1:numel(I)
 
-igl.slice_into(igl.coloni(0,I.size()-1),I,J)
+igl.slice_into(igl.coloni(0, I.size() - 1), I, J)
 
 # Pseudo-color based on sorted place
 C = igl.eigen.MatrixXd()
-igl.jet(J.castdouble(),True,C)
+igl.jet(J.castdouble(), True, C)
 
 # Plot the mesh with pseudocolors
 viewer = igl.viewer.Viewer()