def moving_truss_cp_square(n_steps = 40):
cp = CreasePattern(n_steps = n_steps)
cp.nodes = [[ 0, 2, 0 ],
[ 0, 0, 0 ]]
cp.crease_lines = [[ 0, 1 ]]
face_z_0 = FF(Rf = z_ - 0)
face_x_0 = FF(Rf = x_ - 0)
# face_xy_135 = FF(Rf = x_ + y_ - 1.0)
# face_xy_round = FF(Rf = x_**2 + (y_)**2 - 1.0)
# face_x_1_t = FF(Rf = x_ - 1.0 + 1.99 * t_)
# argument = 2*3.14159*t_
# face_x_1_t = FF(Rf = y_ + 3 + sp.sin(argument))
face_x_1_t = FF(Rf = y_ - 1.0 * (t_ - 1) * sp.Heaviside(t_ - 1)
+ 1.0 * (t_ - 3) * sp.Heaviside(t_ - 3)
+ 1.0 * (t_ - 5) * sp.Heaviside(t_ - 5)
- 1.0 * (t_ - 7) * sp.Heaviside(t_ - 7))
face_y_1_t = FF(Rf = x_ + 1.0 * t_ * sp.Heaviside(t_)
- 1.0 * (t_ - 1) * sp.Heaviside(t_ - 1)
- 1.0 * (t_ - 3) * sp.Heaviside(t_ - 3)
+ 1.0 * (t_ - 5) * sp.Heaviside(t_ - 5)
+ 1.0 * (t_ - 7) * sp.Heaviside(t_ - 7)
- 1.0 * (t_ - 8) * sp.Heaviside(t_ - 8))
# +3.14159/2.0
# face_x_1_t = FF(Rf = y_ - 1.99 * t_)
cp.cnstr_lst = [(face_z_0, [0, 1]),
(face_x_0, [0]),
(face_x_1_t, [1]),
(face_y_1_t, [1])]
X = np.zeros((cp.n_dofs,), dtype = float)
# X[1] = 0.01
# X[0] = 0.01
print 'initial lengths\n', cp.c_lengths
print 'initial vectors\n', cp.c_vectors
print 'initial R\n', cp.get_R(X)
print 'initial dR\n', cp.get_dR(X)
X = cp.solve_ff(X)
print '========== results =============='
print 'solution X\n', X
print 'final positions\n', cp.get_new_nodes(X)
print 'final vectors\n', cp.get_new_vectors(X)
print 'final lengths\n', cp.get_new_lengths(X)
return cp
def moving_truss_cp_ff_cnstr(n_steps = 10, dx = -1.99):
cp = CreasePattern(n_steps = n_steps)
cp.nodes = [[ 0, 0, 0 ],
[ 1, 0, 0 ]]
cp.crease_lines = [[ 0, 1 ]]
face_z_0 = FF(Rf = z_ - 0)
face_x_0 = FF(Rf = x_ - 0)
face_x_1_t = FF(Rf = x_ - 1.0 + 1.99 * t_)
cp.cnstr_lst = [(face_z_0, [0, 1]),
(face_x_0, [0]),
(face_x_1_t, [1])]
cp.cnstr_lhs = [
[(1, 0, 1.0), (1, 1, 1.0)],
]
cp.cnstr_rhs = [0]
X = np.zeros((cp.n_dofs,), dtype = float)
X[1] = 0.01
print 'initial lengths\n', cp.c_lengths
print 'initial vectors\n', cp.c_vectors
print 'initial R\n', cp.get_R(X)
print 'initial dR\n', cp.get_dR(X)
X = cp.solve_ff(X)
print '========== results =============='
print 'solution X\n', X
print 'final positions\n', cp.get_new_nodes(X)
print 'final vectors\n', cp.get_new_vectors(X)
print 'final lengths\n', cp.get_new_lengths(X)
return cp