def rotated_ellipse(width_major, width_minor, major_axis_angle=0, samples=128):
"""Generate a binary mask for an ellipse, centered at the origin.
The major axis will notionally extend to the limits of the array, but this
will not be the case for rotated cases.
Parameters
----------
width_major : `float`
width of the ellipse in its major axis
width_minor : `float`
width of the ellipse in its minor axis
major_axis_angle : `float`
angle of the major axis w.r.t. the x axis, degrees
samples : `int`
number of samples
Returns
-------
`numpy.ndarray`
An ndarray of shape (samples,samples) of value 0 outside the ellipse,
and value 1 inside the ellipse
Notes
-----
The formula applied is:
((x-h)cos(A)+(y-k)sin(A))^2 ((x-h)sin(A)+(y-k)cos(A))^2
______________________________ + ______________________________ 1
a^2 b^2
where x and y are the x and y dimensions, A is the rotation angle of the
major axis, h and k are the centers of the the ellipse, and a and b are
the major and minor axis widths. In this implementation, h=k=0 and the
formula simplifies to:
(x*cos(A)+y*sin(A))^2 (x*sin(A)+y*cos(A))^2
______________________________ + ______________________________ 1
a^2 b^2
see SO:
https://math.stackexchange.com/questions/426150/what-is-the-general-equation-of-the-ellipse-that-is-not-in-the-origin-and-rotate
Raises
------
ValueError
Description
"""
if width_minor > width_major:
raise ValueError(
'By definition, major axis must be larger than minor.')
arr = m.ones((samples, samples))
lim = width_major
x, y = m.linspace(-lim, lim, samples), m.linspace(-lim, lim, samples)
xv, yv = m.meshgrid(x, y)
A = m.radians(-major_axis_angle)
a, b = width_major, width_minor
major_axis_term = ((xv * m.cos(A) + yv * m.sin(A))**2) / a**2
minor_axis_term = ((xv * m.sin(A) - yv * m.cos(A))**2) / b**2
arr[major_axis_term + minor_axis_term > 1] = 0
return arr
def interferogram(self, visibility=1, passes=2, fig=None, ax=None):
''' Creates an interferogram of the :class:`Pupil~.
Args:
visibility (`float`): Visibility of the interferogram
passes (`float`): number of passes (double-pass, quadra-pass, etc.)
fig (pyplot.figure): Figure to draw plot in
ax (pyplot.axis): Axis to draw plot in
Returns:
`tuple` containing:
:class:`~matplotlib.pyplot.figure`: Figure containing the plot
:class:`~matplotlib.pyplot.axis`: Axis containing the plot
'''
epd = self.epd
fig, ax = share_fig_ax(fig, ax)
plotdata = (visibility * sin(2 * pi * passes * self.phase))
im = ax.imshow(plotdata,
extent=[-epd / 2, epd / 2, -epd / 2, epd / 2],
cmap='Greys_r',
interpolation='lanczos',
clim=(-1, 1),
origin='lower')
fig.colorbar(im,
label=r'Wrapped Phase [$\lambda$]',
ax=ax,
fraction=0.046)
ax.set(xlabel=r'Pupil $\xi$ [mm]', ylabel=r'Pupil $\eta$ [mm]')
return fig, ax
def __init__(self,
angle=4,
background='white',
sample_spacing=2,
samples=256):
"""Create a new TitledSquare instance.
Parameters
----------
angle : `float`
angle in degrees to tilt w.r.t. the x axis
background : `string`
white or black; the square will be the opposite color of the background
sample_spacing : `float`
spacing of samples
samples : `int`
number of samples
"""
radius = 0.3
if background.lower() == 'white':
arr = m.ones((samples, samples))
fill_with = 0
else:
arr = m.zeros((samples, samples))
fill_with = 1
# TODO: optimize by working with index numbers directly and avoid
# creation of X,Y arrays for performance.
x = m.linspace(-0.5, 0.5, samples)
y = m.linspace(-0.5, 0.5, samples)
xx, yy = m.meshgrid(x, y)
sf = samples * sample_spacing
# TODO: convert inline operation to use of rotation matrix
angle = m.radians(angle)
xp = xx * m.cos(angle) - yy * m.sin(angle)
yp = xx * m.sin(angle) + yy * m.cos(angle)
mask = (abs(xp) < radius) * (abs(yp) < radius)
arr[mask] = fill_with
super().__init__(data=arr,
unit_x=x * sf,
unit_y=y * sf,
has_analytic_ft=False)
def __init__(self,
angle=8,
background='white',
sample_spacing=2,
samples=384):
''' Creates a new TitledSquare instance.
Args:
angle (`float`): angle in degrees to tilt w.r.t. the x axis.
background (`string`): white or black; the square will be the opposite
color of the background.
sample_spacing (`float`): spacing of samples.
samples (`int`): number of samples.
Returns:
`TiltedSquare`: new TiltedSquare instance.
'''
radius = 0.3
if background.lower() == 'white':
arr = np.ones((samples, samples))
fill_with = 0
else:
arr = np.zeros((samples, samples))
fill_with = 1
# TODO: optimize by working with index numbers directly and avoid
# creation of X,Y arrays for performance.
x = np.linspace(-0.5, 0.5, samples)
y = np.linspace(-0.5, 0.5, samples)
xx, yy = np.meshgrid(x, y)
# TODO: convert inline operation to use of rotation matrix
angle = np.radians(angle)
xp = xx * cos(angle) - yy * sin(angle)
yp = xx * sin(angle) + yy * cos(angle)
mask = (abs(xp) < radius) * (abs(yp) < radius)
arr[mask] = fill_with
super().__init__(data=arr,
sample_spacing=sample_spacing,
synthetic=True)
def na_to_fno(na):
'''Converts an NA to an f/#
Args:
na (float): numerical aperture
Returns:
fno. The f/# of the system.
'''
return 1 / (2 * sin(na))
def cie_1976_wavelength_annotations(wavelengths, fig=None, ax=None):
''' Draws lines normal to the spectral locust on a CIE 1976 diagram and
writes the text for each wavelength.
Args:
wavelengths (`iterable`): set of wavelengths to annotate.
fig (`matplotlib.figure.Figure`): figure to draw on.
ax (`matplotlib.axes.Axis`): axis to draw in.
Returns:
`tuple` containing:
`matplotlib.figure.Figure`: figure containing the annotations.
`matplotlib.axes.Axis`: axis containing the annotations.
Notes:
see SE:
https://stackoverflow.com/questions/26768934/annotation-along-a-curve-in-matplotlib
'''
# some tick parameters
tick_length = 0.025
text_offset = 0.06
# convert wavelength to u' v' coordinates
wavelengths = np.asarray(wavelengths)
idx = np.arange(1, len(wavelengths) - 1, dtype=int)
wvl_lbl = wavelengths[idx]
uv = XYZ_to_uvprime(wavelength_to_XYZ(wavelengths))
u, v = uv[..., 0][idx], uv[..., 1][idx]
u_last, v_last = uv[..., 0][idx - 1], uv[..., 1][idx - 1]
u_next, v_next = uv[..., 0][idx + 1], uv[..., 1][idx + 1]
angle = atan2(v_next - v_last, u_next - u_last) + pi / 2
cos_ang, sin_ang = cos(angle), sin(angle)
u1, v1 = u + tick_length * cos_ang, v + tick_length * sin_ang
u2, v2 = u + text_offset * cos_ang, v + text_offset * sin_ang
fig, ax = share_fig_ax(fig, ax)
tick_lines = LineCollection(np.c_[u, v, u1, v1].reshape(-1, 2, 2), color='0.25', lw=1.25)
ax.add_collection(tick_lines)
for i in range(len(idx)):
ax.text(u2[i], v2[i], str(wvl_lbl[i]), va="center", ha="center", clip_on=True)
return fig, ax
def na_to_fno(na):
"""Convert an NA to an f/#.
Parameters
----------
na : `float`
numerical aperture
Returns
-------
`float`
fno. The f/# of the system.
"""
return 1 / (2 * m.sin(na))
def __init__(self,
angle=4,
contrast=0.9,
crossed=False,
sample_spacing=2,
samples=256):
"""Create a new TitledSquare instance.
Parameters
----------
angle : `float`
angle in degrees to tilt w.r.t. the y axis
contrast : `float`
difference between minimum and maximum values in the image
crossed : `bool`, optional
whether to make a single edge (crossed=False) or pair of crossed edges (crossed=True)
aka a "BMW target"
sample_spacing : `float`
spacing of samples
samples : `int`
number of samples
"""
diff = (1 - contrast) / 2
arr = m.full((samples, samples), 1 - diff)
x = m.linspace(-0.5, 0.5, samples)
y = m.linspace(-0.5, 0.5, samples)
xx, yy = m.meshgrid(x, y)
sf = samples * sample_spacing
angle = m.radians(angle)
xp = xx * m.cos(angle) - yy * m.sin(angle)
# yp = xx * m.sin(angle) + yy * m.cos(angle) # do not need this
mask = xp > 0 # single edge
if crossed:
mask = xp > 0 # set of 4 edges
upperright = mask & m.rot90(mask)
lowerleft = m.rot90(upperright, 2)
mask = upperright | lowerleft
arr[mask] = diff
self.contrast = contrast
self.black = diff
self.white = 1 - diff
super().__init__(data=arr,
unit_x=x * sf,
unit_y=y * sf,
has_analytic_ft=False)
def interferogram(self,
visibility=1,
passes=2,
interp_method='lanczos',
fig=None,
ax=None):
"""Create an interferogram of the `Pupil`.
Parameters
----------
visibility : `float`
Visibility of the interferogram
passes : `float`
Number of passes (double-pass, quadra-pass, etc.)
interp_method : `str`, optional
interpolation method, passed directly to matplotlib
fig : `matplotlib.figure.Figure`, optional
Figure to draw plot in
ax : `matplotlib.axes.Axis`
Axis to draw plot in
Returns
-------
fig : `matplotlib.figure.Figure`, optional
Figure containing the plot
ax : `matplotlib.axes.Axis`, optional:
Axis containing the plot
"""
epd = self.diameter
phase = self.change_phase_unit(to='waves', inplace=False)
fig, ax = share_fig_ax(fig, ax)
plotdata = (visibility * m.sin(2 * m.pi * passes * phase))
im = ax.imshow(plotdata,
extent=[-epd / 2, epd / 2, -epd / 2, epd / 2],
cmap='Greys_r',
interpolation=interp_method,
clim=(-1, 1),
origin='lower')
fig.colorbar(im,
label=r'Wrapped Phase [$\lambda$]',
ax=ax,
fraction=0.046)
ax.set(xlabel=r'Pupil $\xi$ [mm]', ylabel=r'Pupil $\eta$ [mm]')
return fig, ax
def polar_to_cart(rho, phi):
''' Returns the (x,y) coordinates of the (rho,phi) input points.
Args:
rho (`float` or `numpy.ndarray`): radial coordinate.
phi (`float` or `numpy.ndarray`): azimuthal cordinate.
Returns:
`tuple` containing:
`float` or `numpy.ndarray`: x coordinate.
`float` or `numpy.ndarray`: y coordinate.
'''
x = rho * cos(phi)
y = rho * sin(phi)
return x, y
def polar_to_cart(rho, phi):
'''Return the (x,y) coordinates of the (rho,phi) input points.
Parameters
----------
rho : `numpy.ndarray` or number
radial coordinate
phi : `numpy.ndarray` or number
azimuthal coordinate
Returns
-------
x : `numpy.ndarray` or number
x coordinate
y : `numpy.ndarray` or number
y coordinate
'''
x = rho * m.cos(phi)
y = rho * m.sin(phi)
return x, y
def generate_vertices(num_sides, radius=1):
''' Generates a list of vertices for a convex regular polygon with the given
number of sides and radius.
Args:
num_sides (`int`): number of sides to the polygon.
radius (`float`): radius of the polygon.
Returns:
`numpy.ndarray`: array with first column X points, second column Y points
'''
angle = 2 * pi / num_sides
pts = []
for point in range(num_sides):
x = radius * sin(point * angle)
y = radius * cos(point * angle)
pts.append((int(x), int(y)))
return np.asarray(pts)
def generate_vertices(num_sides, radius=1):
"""Generate a list of vertices for a convex regular polygon with the given number of sides and radius.
Parameters
----------
num_sides : `int`
number of sides to the polygon
radius : `float`
radius of the polygon
Returns
-------
`numpy.ndarray`
array with first column X points, second column Y points
"""
angle = 2 * m.pi / num_sides
pts = []
for point in range(num_sides):
x = radius * m.sin(point * angle)
y = radius * m.cos(point * angle)
pts.append((int(x), int(y)))
return m.asarray(pts)
def Z39(rho, phi):
return (7 * rho**7 - 6 * rho**5) * sin(5 * phi)
def Z37(rho, phi):
return rho**6 * sin(6 * phi)
def Z34(rho, phi):
return (5 * rho - 60 * rho**3 + 210 * rho**5 - 280 * rho**7 + 126 * rho**9)\
* sin(phi)
def Z32(rho, phi):
return (10 * rho**2 - 30 * rho**4 + 21 * rho**6) * sin(2 * phi)
def Z28(rho, phi):
return (6 * rho**6 - 5 * rho**4) * sin(4 * phi)
def Z26(rho, phi):
return rho**5 * sin(5 * phi)
def Z23(rho, phi):
return (-4 * rho + 30 * rho**3 - 60 * rho**5 + 35 * rho**7) * sin(phi)
def Z21(rho, phi):
return (6 * rho**2 - 20 * rho**4 + 15 * rho**6) * sin(2 * phi)
def Z2(rho, phi):
return rho * sin(phi)
def Z45(rho, phi):
return (210 * rho**10 - 504 * rho**8 + 420 * rho**6 - 140 * rho**4 + 15 * rho**2) \
* sin(2 * phi)
def Z41(rho, phi):
return (28 * rho**8 - 42 * rho**6 + 15 * rho**4) * sin(4 * phi)
def Z43(rho, phi):
return (84 * rho**9 - 168 * rho**7 + 105 * rho**5 - 20 * rho**3) * sin(3 * phi)
def Z14(rho, phi):
return (3 * rho - 12 * rho**3 + 10 * rho**5) * sin(phi)
def Z47(rho, phi):
return (462 * rho**11 - 1260 * rho**9 + 1260 * rho**7 - 560 * rho**5 + 105 * rho**3 - 6 * rho) \
* sin(phi)
def Z17(rho, phi):
return rho**4 * sin(4 * phi)
def Z5(rho, phi):
return rho**2 * sin(2 * phi)
def Z19(rho, phi):
return (5 * rho**5 - 4 * rho**3) * sin(3 * phi)
