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November 29, 2019 00:09
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Space Invaders
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| const term = require( 'terminal-kit' ).terminal ; | |
| const termkit = require( 'terminal-kit' ) | |
| const ScreenBuffer = termkit.ScreenBuffer; | |
| const INVADERS_WIDTH = 80; | |
| const NO_PER_ROW = 11; | |
| const ROWS = 5; | |
| const COLUMN_WIDTH = 6; | |
| const ROW_HEIGHT = 4; | |
| const FRAMES_TILL_MOVE = 10; | |
| let countframes = 0; | |
| let viewport, sprites = {}; | |
| let x, y, startx, xshoot; | |
| let startState, moveRight = true; | |
| // /òó\ /òó\ | |
| // \/ /\ | |
| // v v | |
| // M M M M | |
| // < > > < | |
| // dôb dôb | |
| // ^ ^ v v | |
| // ṁ | |
| // d[_]b | |
| const drawSprite = (sprite, x, y) => { | |
| sprite.draw({ dst: sprites.invaders, x: x, y: y }) | |
| } | |
| const drawSpaceInvaders = () => { | |
| const inv1string = (startState) ? ' \n/òó\\\n \\/ ' : ' \n/òó\\\n /\\ '; | |
| const inv2string = (startState) ? ' v \nM M \n> < ' : ' v \nM M \n< > '; | |
| const inv3string = (startState) ? ' \ndôb \n^ ^ ' : ' \ndôb \nv v '; | |
| sprites.invader1 = ScreenBuffer.createFromString( | |
| { attr: { color: 'blue' } }, inv1string | |
| ) | |
| sprites.invader2 = ScreenBuffer.createFromString( | |
| { attr: { color: 'white' } }, inv2string | |
| ) | |
| sprites.invader3 = ScreenBuffer.createFromString( | |
| { attr: { color: 'green' } }, inv3string | |
| ) | |
| const spriteArray = [sprites.invader1, | |
| sprites.invader2, | |
| sprites.invader2, | |
| sprites.invader3, | |
| sprites.invader3 ] | |
| ypos = 0 | |
| spriteArray.forEach(sprite => { | |
| let xpos = 0; | |
| [...Array(NO_PER_ROW)].forEach((_, i) => {drawSprite(sprite, xpos, ypos); xpos += COLUMN_WIDTH }) | |
| ypos += ROW_HEIGHT | |
| }) | |
| } | |
| const createInvadersBuffer = () => { | |
| sprites.invaders = new ScreenBuffer({ | |
| dst: viewport, | |
| width: INVADERS_WIDTH, | |
| height: ROW_HEIGHT * ROWS, | |
| x: x, | |
| y: y | |
| }) | |
| } | |
| const createShooter = () => { | |
| sprites.shooter = ScreenBuffer.createFromString( | |
| { attr: { color: 'white' } }, ' ^ \nd[_]b' | |
| ) | |
| } | |
| const drawShooter = () => { | |
| sprites.invaders.draw(); | |
| sprites.shooter.draw({ | |
| dst: viewport, | |
| x: xshoot, | |
| y: viewport.height - 2 | |
| }) | |
| } | |
| terminate = () => { | |
| term.hideCursor( false ) ; | |
| term.grabInput( false ) ; | |
| setTimeout( function() { | |
| term.moveTo( 1 , term.height , '\n\n' ) ; | |
| process.exit() ; | |
| } , 100 ) ; | |
| } | |
| inputs = key => | |
| { | |
| switch ( key ) | |
| { | |
| case 'LEFT' : | |
| if (xshoot >= startx + 5) { | |
| xshoot -= 2; | |
| } | |
| break ; | |
| case 'RIGHT' : | |
| if (xshoot < startx + INVADERS_WIDTH -10) { | |
| xshoot += 2; | |
| } | |
| break ; | |
| case 'UP' : | |
| shootBullets() | |
| break; | |
| case 'q': | |
| case 'CTRL_C': | |
| terminate() ; | |
| break ; | |
| } | |
| } | |
| const nextPosition = () => { | |
| if (moveRight) { | |
| if (sprites.invaders.x < startx + INVADERS_WIDTH - (COLUMN_WIDTH*NO_PER_ROW)) { | |
| sprites.invaders.x += 2; | |
| } else { | |
| sprites.invaders.y += ROW_HEIGHT / 2; | |
| moveRight = false; | |
| } | |
| } else { | |
| if (sprites.invaders.x >= startx) { | |
| sprites.invaders.x -= 2; | |
| } else { | |
| sprites.invaders.y += ROW_HEIGHT / 2; | |
| moveRight = true; | |
| } | |
| } | |
| } | |
| const showText = () => { | |
| term.moveTo(startx + 5).eraseLine.white( | |
| 'Left and Right Arrow keys: move the player - Q/Ctrl-C: Quit' | |
| ); | |
| } | |
| const animate = () => { | |
| term.clear(); | |
| viewport.clear(); | |
| drawShooter(); | |
| if (countframes % FRAMES_TILL_MOVE === 0) { | |
| nextPosition(); | |
| startState = !startState; | |
| drawSpaceInvaders(); | |
| } | |
| viewport.draw(); | |
| showText(); | |
| countframes += 1; | |
| setTimeout( animate, 1000 / 60); | |
| } | |
| const init = callback => { | |
| termkit.getDetectedTerminal((error, detectedTerm) => { | |
| if (error) { | |
| throw new Error('Cannot detect terminal.') | |
| } | |
| terminal = detectedTerm; | |
| twidth = terminal.width; | |
| theight = terminal.height; | |
| x = (twidth > INVADERS_WIDTH) ? (twidth - INVADERS_WIDTH) / 2 : 10; | |
| startx = x; | |
| xshoot = twidth / 2; | |
| y = (theight > ROW_HEIGHT*ROWS) ? theight - (ROW_HEIGHT*ROWS + 25) : 2; | |
| term.clear(); | |
| inputs() | |
| viewport = new ScreenBuffer({ | |
| dst: terminal, | |
| width: Math.min( terminal.width ), | |
| height: Math.min( terminal.height - 1), | |
| y: 2, | |
| noFill: true | |
| }); | |
| createInvadersBuffer(); | |
| drawSpaceInvaders(); | |
| createShooter(); | |
| term.grabInput() ; | |
| term.on( 'key' , inputs ) ; | |
| callback(); | |
| }) | |
| } | |
| init(() => animate()) |
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| { | |
| "name": "space_invaders", | |
| "version": "1.0.0", | |
| "lockfileVersion": 1, | |
| "requires": true, | |
| "dependencies": { | |
| "@cronvel/get-pixels": { | |
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| { | |
| "name": "space_invaders", | |
| "version": "1.0.0", | |
| "description": "", | |
| "main": "index.js", | |
| "scripts": { | |
| "test": "echo \"Error: no test specified\" && exit 1" | |
| }, | |
| "keywords": [], | |
| "author": "", | |
| "license": "ISC", | |
| "dependencies": { | |
| "terminal-kit": "^1.31.7" | |
| } | |
| } |
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Run
yarnornpm installto install terminal-kit module, thennode index.jsto start the game