Coverage for qpdk / samples / sample4.py: 100%

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11# %% [markdown] 

12# # Packing Algorithm Sample 

13# 

14# This sample demonstrates the use of gdsfactory's packing algorithm to efficiently arrange shapes. 

15 

16# %% 

17import gdsfactory as gf 

18import numpy as np 

19 

20# %% [markdown] 

21# ## Sample Function 

22# 

23# Creates a set of random ellipses and packs them efficiently into a rectangular area. 

24 

25 

26# %% 

27@gf.cell 

28def sample4_pack(): 

29 """Returns a component with a packed set of ellipses.""" 

30 rng = np.random.default_rng() 

31 ellipses = [ 

32 gf.components.ellipse(radii=tuple(rng.random(2) * n + 2), layer="M1_DRAW") 

33 for n in range(80) 

34 ] 

35 bins = gf.pack( 

36 ellipses, # Must be a list or tuple of Components 

37 spacing=4, # Minimum distance between adjacent shapes 

38 aspect_ratio=(1, 1), # Shape of the box 

39 max_size=(500, 500), # Limits the size into which the shapes will be packed 

40 density=1.05, # Values closer to 1 pack tighter but require more computation 

41 sort_by_area=True, # Pre-sorts the shapes by area 

42 ) 

43 return bins[0]