def contour(self, bit_diameter, count=1, overlap=0.5):
""" @brief Finds a set of isolines on a distance field image.
@param bit_diameter Tool diameter (in mm)
@param count Number of offsets
@param overlap Overlap between offsets
@returns A list of Paths
"""
if self.depth != 'f' or self.channels != 1:
raise ValueError('Invalid image type for contour cut '+
'(requires floating-point, 1-channel image)')
max_distance = max(self.array.flatten())
levels = [bit_diameter/2]
step = bit_diameter * overlap
if count == -1:
while levels[-1] < max_distance:
levels.append(levels[-1] + step)
levels[-1] = max_distance
else:
for i in range(count-1):
levels.append(levels[-1] + step)
levels = (ctypes.c_float*len(levels))(*levels)
ptr = ctypes.POINTER(ctypes.POINTER(Path_))()
path_count = libfab.find_paths(
self.width, self.height, self.pixels,
1./self.pixels_per_mm, len(levels),
levels, ptr)
paths = [Path.from_ptr(ptr[i]) for i in range(path_count)]
libfab.free_paths(ptr, path_count)
return Path.sort(paths)
def finish_cut(self, bit_diameter, overlap, bit_type):
''' Calculates xy and yz finish cuts on a 16-bit heightmap
'''
if self.depth != 16 or self.channels != 1:
raise ValueError('Invalid image type for finish cut ' +
'(requires 16-bit, 1-channel image)')
ptr = ctypes.POINTER(ctypes.POINTER(Path_))()
path_count = libfab.finish_cut(self.width, self.height, self.pixels,
self.mm_per_pixel, self.mm_per_bit,
bit_diameter, overlap, bit_type, ptr)
paths = [Path.from_ptr(ptr[i]) for i in range(path_count)]
libfab.free_paths(ptr, path_count)
return paths
def finish_cut(self, bit_diameter, overlap, bit_type):
''' Calculates xy and yz finish cuts on a 16-bit heightmap
'''
if self.depth != 16 or self.channels != 1:
raise ValueError('Invalid image type for finish cut '+
'(requires 16-bit, 1-channel image)')
ptr = ctypes.POINTER(ctypes.POINTER(Path_))()
path_count = libfab.finish_cut(
self.width, self.height, self.pixels,
self.mm_per_pixel, self.mm_per_bit,
bit_diameter, overlap, bit_type, ptr)
paths = [Path.from_ptr(ptr[i]) for i in range(path_count)]
libfab.free_paths(ptr, path_count)
return paths
