move facial landmarks using matplotlib

Question

tried to include your suggestions, not sure why it doesn't work:

# face alignment

import face_alignment
import numpy as np
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
from skimage import io

# Run the 3D face alignment on a test image, without CUDA.
fa = face_alignment.FaceAlignment(face_alignment.LandmarksType._2D, device='cpu', flip_input=True)

input = io.imread(r'C:/Users/Ihr Name/Pictures/Bewerbungsfotos/neuropic.jpg')
preds = fa.get_landmarks(input)[-1] 

#landmarks == preds, input = pixels image


import matplotlib.pyplot as plt
import matplotlib.patches as patches

class DraggablePoints(object):
    def __init__(self, artists, tolerance=5):
        for artist in artists:
            artist.set_picker(tolerance)
        self.artists = artists
        self.currently_dragging = False
        self.current_artist = None
        self.offset = (0, 0)

        for canvas in set(artist.figure.canvas for artist in self.artists):
            canvas.mpl_connect('button_press_event', self.on_press)
            canvas.mpl_connect('button_release_event', self.on_release)
            canvas.mpl_connect('pick_event', self.on_pick)
            canvas.mpl_connect('motion_notify_event', self.on_motion)

    def on_press(self, event):
        self.currently_dragging = True

    def on_release(self, event):
        self.currently_dragging = False
        self.current_artist = None

    def on_pick(self, event):
        if self.current_artist is None:
            self.current_artist = event.artist
            x0, y0 = event.artist.center
            x1, y1 = event.mouseevent.xdata, event.mouseevent.ydata
            self.offset = (x0 - x1), (y0 - y1)

    def on_motion(self, event):
        if not self.currently_dragging:
            return
        if self.current_artist is None:
            return
        dx, dy = self.offset
        self.current_artist.center = event.xdata + dx, event.ydata + dy
        self.current_artist.figure.canvas.draw()

if __name__ == '__main__':

    fig = plt.figure(figsize=plt.figaspect(.5))
    ax = fig.add_subplot(1, 2, 1)
    ax.imshow(input)
    ax.plot(preds[0:17,0],preds[0:17,1],marker='o',markersize=6,linestyle='-',color='w',lw=2)
    ax.plot(preds[17:22,0],preds[17:22,1],marker='o',markersize=6,linestyle='-',color='w',lw=2)
    ax.plot(preds[22:27,0],preds[22:27,1],marker='o',markersize=6,linestyle='-',color='w',lw=2)
    ax.plot(preds[27:31,0],preds[27:31,1],marker='o',markersize=6,linestyle='-',color='w',lw=2)
    ax.plot(preds[31:36,0],preds[31:36,1],marker='o',markersize=6,linestyle='-',color='w',lw=2)
    ax.plot(preds[36:42,0],preds[36:42,1],marker='o',markersize=6,linestyle='-',color='w',lw=2)
    ax.plot(preds[42:48,0],preds[42:48,1],marker='o',markersize=6,linestyle='-',color='w',lw=2)
    ax.plot(preds[48:60,0],preds[48:60,1],marker='o',markersize=6,linestyle='-',color='w',lw=2)
    ax.plot(preds[60:68,0],preds[60:68,1],marker='o',markersize=6,linestyle='-',color='w',lw=2) 
    ax.axis('off')

    ax = fig.add_subplot(1, 2, 2, projection='3d')
    surf = ax.scatter(preds[:,0]*1.2,preds[:,1],preds[:,2],c="cyan", alpha=0.5, edgecolor='b')
    ax.plot3D(preds[:17,0]*1.2,preds[:17,1], preds[:17,2], color='blue' )
    ax.plot3D(preds[17:22,0]*1.2,preds[17:22,1],preds[17:22,2], color='blue')
    ax.plot3D(preds[22:27,0]*1.2,preds[22:27,1],preds[22:27,2], color='blue')
    ax.plot3D(preds[27:31,0]*1.2,preds[27:31,1],preds[27:31,2], color='blue')
    ax.plot3D(preds[31:36,0]*1.2,preds[31:36,1],preds[31:36,2], color='blue')
    ax.plot3D(preds[36:42,0]*1.2,preds[36:42,1],preds[36:42,2], color='blue')
    ax.plot3D(preds[42:48,0]*1.2,preds[42:48,1],preds[42:48,2], color='blue')
    ax.plot3D(preds[48:,0]*1.2,preds[48:,1],preds[48:,2], color='blue' )


    ax.view_init(elev=90., azim=90.)
    ax.set_xlim(ax.get_xlim()[::-1])

#we want to move preds (landmarks)

    for p in preds:
        ax.add_patch(p)
        dr = DraggablePoints(preds)
        plt.show()