Make cave generator example more clear.

HexDecimal · HexDecimal · commit c7281c99a374 · 2021-03-07T00:51:34.000-08:00
This version works better if the input isn't a boolean array.
diff --git a/examples/cavegen.py b/examples/cavegen.py
@@ -20,7 +20,7 @@ def convolve(tiles: np.array, wall_rule: int = 5) -> np.array:
     """
     # Use convolve2d, the 2nd input is a 3x3 ones array.
     neighbors = scipy.signal.convolve2d(
-        ~tiles, [[1, 1, 1], [1, 1, 1], [1, 1, 1]], "same"
+        tiles == 0, [[1, 1, 1], [1, 1, 1], [1, 1, 1]], "same"
     )
     return neighbors < wall_rule  # Apply the wall rule.
 

Original file line number	Diff line number	Diff line change
`@@ -20,7 +20,7 @@ def convolve(tiles: np.array, wall_rule: int = 5) -> np.array:`
`20`	`20`	`"""`
`21`	`21`	`# Use convolve2d, the 2nd input is a 3x3 ones array.`
`22`	`22`	`neighbors = scipy.signal.convolve2d(`
`23`		`- ~tiles, [[1, 1, 1], [1, 1, 1], [1, 1, 1]], "same"`
	`23`	`+ tiles == 0, [[1, 1, 1], [1, 1, 1], [1, 1, 1]], "same"`
`24`	`24`	`)`
`25`	`25`	`return neighbors < wall_rule # Apply the wall rule.`
`26`	`26`