July 2015
Intermediate to advanced
286 pages
6h 31m
English
Content preview from Mazes for Programmers
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Implementing the Binary Tree Algorithm
Let’s start with the Binary Tree algorithm. As you’ll recall from The Binary Tree Algorithm, it works simply by visiting each cell in the grid and choosing to carve a passage either north or east.
The following code does just that. We’re going to put it in its own class so that we can easily reuse this code whenever we want. Save it to a file named binary_tree.rb, and make sure it’s in the same directory as the cell.rb and grid.rb files we created earlier.
| binary_tree.rb | |
| Line 1 | class BinaryTree |
| - | |
| - | def self.on(grid) |
| - | grid.each_cell do |cell| |
| 5 | neighbors = [] |
| - | neighbors << cell.north if cell.north |
| - | neighbors << cell.east if cell.east |
| - | |
| - | index = rand(neighbors.length) |
| 10 | neighbor ... |
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