71 lines
1.8 KiB
Swift
71 lines
1.8 KiB
Swift
//
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// Terminal.swift
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// FruitMachine
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//
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// Created by Christopher Rohl on 7/27/17.
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// Copyright © 2017 Christopher Rohl. All rights reserved.
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//
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import Cocoa
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struct Cell {
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var x: Int
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var y: Int
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}
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class Terminal: NSObject {
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static let CELLS_WIDTH = 40
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static let CELLS_HEIGHT = 24
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static let CELLS_COUNT = CELLS_WIDTH * CELLS_HEIGHT
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var cursorPosition: Cell
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var characters: [UInt8]
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override init() {
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cursorPosition = Cell(x: 0, y: 0)
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characters = [UInt8](repeating: 0x00, count: Terminal.CELLS_WIDTH * Terminal.CELLS_HEIGHT)
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}
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func cellToIndex(cell: Cell) -> Int {
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return (cell.y * Terminal.CELLS_WIDTH) + (cell.x % Terminal.CELLS_WIDTH)
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}
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func putCharacter(charIndex: UInt8) {
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if(charIndex == 0x8D)
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{
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carriageReturn()
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}
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else {
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characters[cellToIndex(cell: cursorPosition)] = charIndex
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advanceCursor()
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}
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}
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func advanceCursor() {
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cursorPosition.x += 1
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if(cursorPosition.x == Terminal.CELLS_WIDTH) {
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cursorPosition.x = 0
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cursorPosition.y += 1
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if(cursorPosition.y >= Terminal.CELLS_HEIGHT) {
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cursorPosition.y = Terminal.CELLS_HEIGHT - 1
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scrollUp(lines: 1)
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}
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}
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}
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func carriageReturn() {
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cursorPosition.x = 0
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cursorPosition.y += 1
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if(cursorPosition.y >= Terminal.CELLS_HEIGHT) {
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cursorPosition.y = Terminal.CELLS_HEIGHT - 1
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scrollUp(lines: 1)
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}
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}
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func scrollUp(lines: Int) {
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let scrolled = characters[Terminal.CELLS_WIDTH ..< Terminal.CELLS_COUNT]
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characters = [UInt8](scrolled)
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characters.append(contentsOf: [UInt8](repeating: 0x00, count: Terminal.CELLS_WIDTH))
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}
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}
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