def test_curved_headers_are_all_one_pixel_apart(self, curved_trace):
curved_trace["y1"] *= 1.1
curved_trace["y2"] *= 1.2
spt = SpectralTrace(curved_trace)
pixel_size = 0.015
hdrs = spt.get_curve_headers(pixel_size)
dx = np.diff([hdr["CRVAL1D"] for hdr in hdrs])
dy = np.diff([hdr["CRVAL2D"] for hdr in hdrs])
dr = (dx**2 + dy**2)**0.5
assert np.all(dr <= 1)
# !!! PLOT this again to see issues
if PLOTS:
# orig world coords
for row in curved_trace:
x = [row["x0"], row["x2"]]
y = [row["y0"], row["y2"]]
len_mm = (np.diff(x)**2 + np.diff(y)**2)**0.5
plt.plot(x, y, "k")
plt.plot(x[0], y[0], "ko")
plt.text(x[0], y[0], len_mm)
# pixel coords
for hdr in hdrs[::86]:
xp = [0, hdr["NAXIS1"]]
yp = [0, hdr["NAXIS2"]]
wcs = WCS(hdr, key="D")
# world coords
xw, yw = wcs.all_pix2world(xp, yp, 1)
plt.plot(xw, yw, "r")
plt.plot(hdr["CRVAL1D"], hdr["CRVAL2D"], "ro")
len_mm = (np.diff(xw)**2 + np.diff(yw)**2)**0.5
plt.text(hdr["CRVAL1D"], hdr["CRVAL2D"], len_mm, color="red")
plt.show()
def test_dispersion_for_horizontally_aligned_trace(self, horizontal_trace):
spt = SpectralTrace(horizontal_trace)
disp, wave = spt.get_max_dispersion()
dx = np.abs(np.diff(horizontal_trace["x"]))
dw = np.abs(np.diff(horizontal_trace["wavelength"]))
assert np.average(disp) == approx(np.average(dx / dw), rel=1e-5)
def test_diagonal_headers_are_all_one_pixel_apart(self, horizontal_trace):
spt = SpectralTrace(horizontal_trace)
pixel_size = 0.015
hdrs = spt.get_curve_headers(pixel_size)
x = [hdr["CRVAL1D"] / pixel_size for hdr in hdrs]
y = [hdr["CRVAL2D"] / pixel_size for hdr in hdrs]
assert np.all(np.abs(np.diff(x)) == approx(1, rel=1e-5))
def test_mtc_one_pixel_apart_for_diagonal_traces(self, diagonal_trace):
pixel_size = 0.015
spt = SpectralTrace(diagonal_trace)
disp, wave = spt.get_max_dispersion()
wave_edges = spt.get_pixel_wavelength_edges(
pixel_size) # wavelength edges
dist_between_mtc = np.average(disp) * np.average(np.diff(wave_edges))
assert dist_between_mtc == approx(pixel_size, rel=1e-5)
def test_monochromatic_trace_curves_are_one_pixel_apart(self, basic_trace):
pixel_size = 0.015
spt = SpectralTrace(basic_trace)
disp, wave = spt.get_max_dispersion()
wbedges = spt.get_pixel_wavelength_edges(
pixel_size) # wavelength edges
dist_between_mtc = np.average(disp) * np.average(np.diff(wbedges))
assert dist_between_mtc == approx(pixel_size, rel=1e-5)
def test_dispersion_for_vertically_aligned_trace(self, basic_trace):
# ..todo: accuracy of get_max_dispersion should be tested in a trace_list_utils tests file
spt = SpectralTrace(basic_trace)
disp, wave = spt.get_max_dispersion()
# dispersion is calculated by distance [mm] / wavelength coverage [um]
dy = np.diff(basic_trace["y"])
dw = np.diff(basic_trace["wavelength"])
assert np.average(disp) == approx(np.average(dy / dw), rel=1e-5)
assert len(disp) == len(wave)
assert all(np.diff(wave) > 0)
def test_mtc_distances_are_one_pixel_horiz_trace(self, horizontal_trace):
spt = SpectralTrace(horizontal_trace)
mtcs = spt.get_trace_curves(0.015)
pix_cen_x = [mtc.header["CRVAL1D"] / 0.015 for mtc in mtcs]
pix_cen_y = [mtc.header["CRVAL2D"] / 0.015 for mtc in mtcs]
assert np.abs(np.average(np.diff(pix_cen_x))) == approx(1, rel=1e-5)
if PLOTS:
plt.plot(pix_cen_x, pix_cen_y)
plt.show()
def test_mtc_distances_are_one_pixel_diagonal_trace(self, diagonal_trace):
# diagonal trace is 30 degrees off vertical
spt = SpectralTrace(diagonal_trace)
mtcs = spt.get_trace_curves(0.015)
pix_cen_x = [mtc.header["CRVAL1D"] / 0.015 for mtc in mtcs]
pix_cen_y = [mtc.header["CRVAL2D"] / 0.015 for mtc in mtcs]
assert np.abs(np.average(np.diff(pix_cen_y))) == approx(1, rel=1e-5)
if PLOTS:
plt.plot(pix_cen_x, pix_cen_y, "o")
plt.show()
def test_no_same_angles_for_curved_trace(self, curved_trace):
spt = SpectralTrace(curved_trace)
mtcs = spt.get_trace_curves(0.015)
rots = [mtc.meta["rotation"] for mtc in mtcs]
shears = [mtc.meta["shear"] for mtc in mtcs]
assert len(np.unique(rots)) == len(np.unique(np.diff(rots)))
if PLOTS:
plt.subplot(121)
for mtc in mtcs[::100]:
plt.plot(mtc.x, mtc.y)
plt.subplot(122)
plt.plot(rots)
plt.plot(shears)
plt.show()
def test_limits_trace_curves_to_xy_edges(self, diagonal_trace):
spt = SpectralTrace(diagonal_trace)
xy_edges = {"x_min": -25, "x_max": -15, "y_min": 10, "y_max": 20}
mtcs_all = spt.get_trace_curves(0.015)
mtcs_xy_limited = spt.get_trace_curves(0.015, xy_edges=xy_edges)
assert len(mtcs_all) > len(mtcs_xy_limited)
if PLOTS:
for mtc in mtcs_xy_limited:
plt.plot(mtc.x, mtc.y)
spt.plot(spt.wave_min, spt.wave_max)
plt.axhline(xy_edges["y_min"])
plt.axhline(xy_edges["y_max"])
plt.axvline(xy_edges["x_min"])
plt.axvline(xy_edges["x_max"])
plt.show()
def test_initialised_with_nothing_throws_error(self):
with pytest.raises(TypeError):
SpectralTrace()
def test_initialised_with_curve(self, basic_trace):
assert isinstance(SpectralTrace(basic_trace), SpectralTrace)
def test_list_info(self, curved_trace):
spt = SpectralTrace(curved_trace,
aperture_id=0,
extension_id=2,
image_plane_id=0)
print(spt)
def test_plots(self, curved_trace):
spt = SpectralTrace(curved_trace)
if PLOTS:
spt.plot(0.5, 2.5)
plt.show()
def test_mtc_are_one_pixel_removed_from_each_other(self, basic_trace):
spt = SpectralTrace(basic_trace)
mtcs = spt.get_trace_curves(0.015)
pix_cen_x = [mtc.header["CRVAL1D"] / 0.015 for mtc in mtcs]
pix_cen_y = [mtc.header["CRVAL2D"] / 0.015 for mtc in mtcs]
assert np.average(np.diff(pix_cen_y)) == approx(1, rel=1e-5)