Dragging a fixed object to affect another

A demo of interactively “dragging” a non-movable object.

• Features

  • Graphics quibs

  • Graphics-driven assignments

  • Inverse assignments of binary operators

• Try me

  • Try dragging the fixed diamond. It won’t move but will affect the position of the circle.

from pyquibbler import iquib, initialize_quibbler, q
initialize_quibbler()
import matplotlib.pyplot as plt
import numpy as np
%matplotlib tk

# define and plot a point at xy coordinates:
xy = iquib(np.array([2., 3.]))
plt.axis('square')
plt.axis([-10, 10, -10, 10])
plt.plot(xy[0], xy[1], 'o', markersize=20)
plt.text(-9, 9, np.array2string(xy, precision=2))

# define and plot a differential function quib,
# which is by defintion fixed at [0, 0]:
dxy = xy - xy
plt.plot(dxy[0], dxy[1], 'd', markersize=20);