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Optimization: Neighbor Pre-fetch (#10)
* use toroidal matrix for neighbor generation * add settings to create larger grids
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| // | ||
| // ToroidalMatrix.swift | ||
| // Derived from dimo hamdy https://stackoverflow.com/a/53421491/2117288 | ||
| // https://gist.github.com/amiantos/bb0f313da1ee686f4f69b8b44f3cd184 | ||
| // | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
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| struct ToroidalMatrix<T> { | ||
| let rows: Int, columns: Int | ||
| var grid: [T] | ||
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| init(rows: Int, columns: Int, defaultValue: T) { | ||
| self.rows = rows | ||
| self.columns = columns | ||
| grid = Array(repeating: defaultValue, count: rows * columns) | ||
| } | ||
|
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| func indexIsValid(row: Int, column: Int) -> Bool { | ||
| return row >= 0 && row < rows && column >= 0 && column < columns | ||
| } | ||
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| subscript(row: Int, column: Int) -> T { | ||
| get { | ||
| let safeRow = 0 ... rows-1 ~= row ? row : row > rows-1 ? 0 : row < 0 ? rows-1 : -1 | ||
| let safeColumn = 0 ... columns-1 ~= column ? column : column > columns-1 ? 0 : column < 0 ? columns-1 : -1 | ||
| assert(indexIsValid(row: safeRow, column: safeColumn), "Index out of range") | ||
| return grid[(safeRow * columns) + safeColumn] | ||
| } | ||
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| set { | ||
| assert(indexIsValid(row: row, column: column), "Index out of range") | ||
| grid[(row * columns) + column] = newValue | ||
| } | ||
| } | ||
| } |
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