plot-sphere-arrow.py

# -*- coding: utf-8 -*-

# http://stackoverflow.com/questions/40128684/pythonista-user-initiated-programs-do-not-run

from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import numpy as np
from itertools import product, combinations
fig = plt.figure()
ax = fig.gca(projection='3d')
ax.set_aspect("equal")

#draw cube
r = [-1, 1]
for s, e in combinations(np.array(list(product(r,r,r))), 2):
	if np.sum(np.abs(s-e)) == r[1]-r[0]:
		ax.plot3D(*zip(s,e), color="b")
		
# draw sphere
u, v = np.mgrid[0:2*np.pi:20j, 0:np.pi:10j]
x=np.cos(u)*np.sin(v)
y=np.sin(u)*np.sin(v)
z=np.cos(v)
ax.plot_wireframe(x, y, z, color="r")

#draw a point
ax.scatter([0],[0],[0],color="g",s=100)

#draw a vector
from matplotlib.patches import FancyArrowPatch
from mpl_toolkits.mplot3d import proj3d

class Arrow3D(FancyArrowPatch):
	def __init__(self, xs, ys, zs, *args, **kwargs):
		FancyArrowPatch.__init__(self, (0,0), (0,0), *args, **kwargs)
		self._verts3d = xs, ys, zs
		
	def draw(self, renderer):
		xs3d, ys3d, zs3d = self._verts3d
		xs, ys, zs = proj3d.proj_transform(xs3d, ys3d, zs3d, renderer.M)
		self.set_positions((xs[0],ys[0]),(xs[1],ys[1]))
		FancyArrowPatch.draw(self, renderer)
		
a = Arrow3D([0,1],[0,1],[0,1], mutation_scale=20, lw=1, arrowstyle="-|>", color="k")
ax.add_artist(a)
plt.show()