def cor2xybound(cor):
''' Helper function to clip max/min stretch factor '''
corU = cor[0::2]
corB = cor[1::2]
zU = -50
u = panostretch.coorx2u(corU[:, 0])
vU = panostretch.coory2v(corU[:, 1])
vB = panostretch.coory2v(corB[:, 1])
x, y = panostretch.uv2xy(u, vU, z=zU)
c = np.sqrt(x**2 + y**2)
zB = c * np.tan(vB)
xmin, xmax = x.min(), x.max()
ymin, ymax = y.min(), y.max()
S = 3 / abs(zB.mean() - zU)
dx = [abs(xmin * S), abs(xmax * S)]
dy = [abs(ymin * S), abs(ymax * S)]
return min(dx), min(dy), max(dx), max(dy)
def find_occlusion(coor):
u = panostretch.coorx2u(coor[:, 0])
v = panostretch.coory2v(coor[:, 1])
x, y = panostretch.uv2xy(u, v, z=-50)
occlusion = []
for i in range(len(x)):
raycast = LineString([(0, 0), (x[i], y[i])])
other_layout = []
for j in range(i + 1, len(x)):
other_layout.append((x[j], y[j]))
for j in range(0, i):
other_layout.append((x[j], y[j]))
other_layout = LineString(other_layout)
occlusion.append(raycast.intersects(other_layout))
return np.array(occlusion)
