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Add transparency channel to output canvas #2

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Add transparency channel to output canvas #2

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19 changes: 12 additions & 7 deletions ico_sampler/icosahedral_sampler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -219,8 +219,9 @@ def get_face_image(self, face_no, eq_image):
xy = self.__get_triangle_coords(self.resolution, is_up, normalize=False, homogeneous=False, center=False)

triangle_height = 3**0.5/2
canvas = np.zeros([int(self.resolution*triangle_height), self.resolution, 3], dtype=np.uint8)
canvas[xy[:, 1], xy[:, 0]] = colors
canvas = np.zeros([int(self.resolution*triangle_height), self.resolution, 4], dtype=np.uint8)
canvas[xy[:, 1], xy[:, 0],2::-1] = colors
canvas[xy[:, 1], xy[:, 0], 3] = 255 # Set alpha to opaque where color is present
return canvas

# =============================================== UNWRAP ===========================================================
Expand All @@ -243,7 +244,7 @@ def unwrap(self, eq_image, face_offset=0):

colors = [self.get_face_rgb(i, eq_image) for i in range(20)]
h_res = int(3**0.5/2*self.resolution)
canvas = np.ones([3*h_res, int(5.5*self.resolution), 3], dtype=np.uint8)*255
canvas = np.zeros([3*h_res, int(5.5*self.resolution), 4], dtype=np.uint8)

# coordinates for moving the color from faces to canvas
xy_up = self.__get_triangle_coords(self.resolution, True, normalize=False, homogeneous=False, center=False)
Expand All @@ -253,13 +254,17 @@ def unwrap(self, eq_image, face_offset=0):

# move colors from faces to canvas
for num, loc in loc_generator:
canvas[xy_up[..., 1], int((loc+0.5)*self.resolution)+xy_up[..., 0]] = colors[num]
canvas[xy_up[..., 1], int((loc+0.5)*self.resolution)+xy_up[..., 0],2::-1] = colors[num]
canvas[xy_up[..., 1], int((loc+0.5)*self.resolution)+xy_up[..., 0],3] = 255
for num, loc in loc_generator:
canvas[h_res+xy_down[..., 1], int((loc+0.5)*self.resolution)+xy_down[..., 0]] = colors[5+num]
canvas[h_res+xy_down[..., 1], int((loc+0.5)*self.resolution)+xy_down[..., 0],2::-1] = colors[5+num]
canvas[h_res+xy_down[..., 1], int((loc+0.5)*self.resolution)+xy_down[..., 0],3] = 255
for num, loc in loc_generator:
canvas[h_res+xy_up[..., 1], loc*self.resolution+xy_up[..., 0]] = colors[10+num]
canvas[h_res+xy_up[..., 1], loc*self.resolution+xy_up[..., 0],2::-1] = colors[10+num]
canvas[h_res+xy_up[..., 1], loc*self.resolution+xy_up[..., 0],3] = 255
for num, loc in loc_generator:
canvas[2*h_res+xy_down[..., 1], loc*self.resolution+xy_down[..., 0]] = colors[15+num]
canvas[2*h_res+xy_down[..., 1], loc*self.resolution+xy_down[..., 0],2::-1] = colors[15+num]
canvas[2*h_res+xy_down[..., 1], loc*self.resolution+xy_down[..., 0],3] = 255

return canvas