Design and Make a Video game
In this video I’m going to design and make an original video game in one video. I’ll talk about how I came up with the idea. I’ll then show you how I designed the look and created the art. After that we’ll program the entire game in JavaScript.
You’ll learn about Sprite Sheets, Creating Complex Animations, Playing Sounds, Solving Complex Problems, Preloading Images, Using Callbacks and a whole lot more. Heavily commented code can be found below the video.
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Code from the Video
Image Files
MusicalNotesSS.png
MusicalNotesSSWhite.png
NoteCubesSS.png
NoteCubeSSWhite.png
learnukulele.html
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<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width = device-width, initial-scale = 1"> <title>Learn Ukulele</title> <link rel="stylesheet" type="text/css" href="style.css"> <script src="Tone.js"></script> <script src="ukulele.js"></script> </head> <body> <div id='container'> <canvas id='my-canvas' ></canvas> </div> </body> </html> |
style.css
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body{ background: #000; } #my-canvas { background: #000; } |
ukulele.js
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let canvas; let ctx; let canvasWidth = window.innerWidth; let canvasHeight = window.innerHeight; let imgNameArr = ['NoteCubesSS.png', 'MusicalNotesSS.png', 'NoteCubeSSWhite.png', 'MusicalNotesSSWhite.png']; let spriteSheets = []; let notes = []; var synth = new Tone.Synth().toMaster(); let noteArray = [['0G40', 0], ['0C40', 150], ['0E40', 300], ['0A40', 450], ['1G4#', 600], ['1C4#', 750], ['1F40', 900], ['1A4#', 1050], ['2A40', 1200], ['2D40', 1350], ['2F4#', 1500], ['2B40', 1650], ['3A4#', 1800], ['3D4#', 1950], ['3G40', 2100], ['3C50', 2250], ['4B40', 2400], ['4E40', 2550], ['4G4#', 2700], ['4C5#', 2850], ['5C50', 3000], ['5F40', 3150], ['5A40', 3300], ['5D50', 3450], ['6C5#', 3600], ['6F4#', 3750], ['6A4#', 3900], ['6D5#', 4050], ['7D50', 4200], ['7G40', 4350], ['7B40', 4500], ['7E50', 4650], ['8D5#', 4800], ['8G4#', 4950], ['8C50', 5100], ['8F50', 5250], ['9E50', 5400], ['9A40', 5550], ['9C5#', 5700], ['9F5#', 5850], ['AF50', 6000], ['AA4#', 6150], ['AD50', 6300], ['AG50', 6450], ['BF5#', 6600], ['BB40', 6750], ['BD5#', 6900], ['BG5#', 7050], ['CG50', 7200], ['CC50', 7350], ['CE50', 7500], ['CA50', 7650]]; let noteMap = new Map(noteArray); document.addEventListener('DOMContentLoaded', SetupCanvas); class Note{ constructor(name, xStart){ this.name = name; this.type = this.name.slice(4); this.visible = true; this.fileName = this.name.slice(0,4); if(this.type === '4') this.ssTopSymbolX = 140; if(this.type === '5') this.ssTopSymbolX = 280; if(this.type === '6') this.ssTopSymbolX = 420; this.topNoteX = xStart || 2490; this.bottomNoteX = xStart || 2490; this.noteCubeSSX; this.hasSharp = (this.name.charAt(3) === '#') ? true : false; this.noteCode = this.name.slice(1,3); if(this.noteCode === 'C4') this.topNoteY = 270, this.bottomNoteY = 1050, this.noteCubeSSX = 150; if(this.noteCode === 'D4') this.topNoteY = 220, this.bottomNoteY = 1050, this.noteCubeSSX = 1350; if(this.noteCode === 'E4') this.topNoteY = 170, this.bottomNoteY = 900, this.noteCubeSSX = 300; if(this.noteCode === 'F4') this.topNoteY = 120, this.bottomNoteY = 900, this.noteCubeSSX = 900; if(this.noteCode === 'G4') this.topNoteY = 70, this.bottomNoteY = 900, this.noteCubeSSX = 2100; if(this.noteCode === 'A4') this.topNoteY = 20, this.bottomNoteY = 750, this.noteCubeSSX = 450; if(this.name.slice(1,4) === 'A4#') this.topNoteY = 20, this.bottomNoteY = 750, this.noteCubeSSX = 1050; if(this.noteCode === 'B4') this.topNoteY = -30, this.bottomNoteY = 750, this.noteCubeSSX = 1650; if(this.noteCode === 'C5') this.topNoteY = -80, this.bottomNoteY = 750, this.noteCubeSSX = 2250; if(this.noteCode === 'D5') this.topNoteY = -130, this.bottomNoteY = 750, this.noteCubeSSX = 3450; if(this.noteCode === 'E5') this.topNoteY = -180, this.bottomNoteY = 750, this.noteCubeSSX = 4650; if(this.noteCode === 'F5') this.topNoteY = -230, this.bottomNoteY = 750, this.noteCubeSSX = 5250; if(this.noteCode === 'G5') this.topNoteY = -280, this.bottomNoteY = 750, this.noteCubeSSX = 6450; if(this.noteCode === 'A5') this.topNoteY = -330, this.bottomNoteY = 750, this.noteCubeSSX = 7650; this.speed = 5; } Update(){ this.topNoteX -= this.speed; this.bottomNoteX -= this.speed; if(this.bottomNoteX === 240) this.visible = false; } Draw(){ if(this.visible){ if(this.bottomNoteX <= (canvasWidth / 2) && this.bottomNoteX >= ((canvasWidth / 2) - 112)){ ctx.drawImage(spriteSheets[3], this.ssTopSymbolX, 0, 138, 362, this.topNoteX, this.topNoteY, 138, 362); if(this.hasSharp){ ctx.drawImage(spriteSheets[3], 560, 0, 138, 362, (this.topNoteX + 25), (this.topNoteY + 60), 140, 362); } ctx.drawImage(spriteSheets[2], this.noteCubeSSX, 0, 150, 112, this.bottomNoteX, this.bottomNoteY, 150, 112); synth.triggerAttackRelease(this.noteCode, "4n"); } else { ctx.drawImage(spriteSheets[1], this.ssTopSymbolX, 0, 138, 362, this.topNoteX, this.topNoteY, 138, 362); if(this.hasSharp){ ctx.drawImage(spriteSheets[1], 560, 0, 138, 362, (this.topNoteX + 25), (this.topNoteY + 60), 140, 362); } ctx.drawImage(spriteSheets[0], this.noteCubeSSX, 0, 150, 112, this.bottomNoteX, this.bottomNoteY, 150, 112); } } } } function SetupCanvas(){ canvas = document.getElementById("my-canvas"); ctx = canvas.getContext("2d"); canvas.width = canvasWidth; canvas.height = canvasHeight; ctx.fillStyle = "black"; ctx.fillRect(0,0, canvas.width, canvas.height); let noteBuffer = 170; let sumOfBuffers = 0; let noteType = 4; for(let i = 0; i < song.length; i++){ let newX = 2490 + ((i * 170) + noteBuffer) + sumOfBuffers; notes.push(new Note(song[i], newX)); if(noteType === '5') sumOfBuffers += 170; if(noteType === '6') sumOfBuffers += 510; noteType = song[i].slice(4); if(noteType === '4') noteBuffer = 170; if(noteType === '5') noteBuffer = 340; if(noteType === '6') noteBuffer = 680; } PreloadImages(imgNameArr, Render); } let song = ['0C404', '0E404', '1F404', '3G405', '0C404', '0E404', '1F404', '3G405', '0C404', '0E404', '1F404', '3G405', '0E405', '0C405', '0E405', '2D405', '0E404', '0E404', '2D404', '0C405', '0C404', '0E405', '3G405', '3G404', '1F405', '1F404', '0E404', '1F404', '3G405', '0E405', '0C405', '2D405', '0C405',]; function PreloadImages(files, imgsLoadedCallback){ var fileCounter = 0; var numOfFiles = files.length; files.forEach(function(file){ PreloadImage(file, function(){ fileCounter++; if(fileCounter == numOfFiles){ imgsLoadedCallback(); } }); }); function PreloadImage(url, imgLoadedCallback){ var img = new Image(); img.onload = imgLoadedCallback; img.src = url; spriteSheets.push(img); } } function Render(){ ctx.clearRect(0,0, canvasWidth, canvasHeight); DrawBoard(); for(let i = 0; i < notes.length; i++){ notes[i].Update(); notes[i].Draw(); } requestAnimationFrame(Render); } function DrawBoard(){ ctx.beginPath(); ctx.strokeStyle = "#6A9954"; ctx.lineWidth = 3; ctx.moveTo(36, 100); ctx.lineTo(2528, 100); ctx.stroke(); ctx.moveTo(36, 200); ctx.lineTo(2528, 200); ctx.stroke(); ctx.moveTo(36, 300); ctx.lineTo(2528, 300); ctx.stroke(); ctx.moveTo(36, 400); ctx.lineTo(2528, 400); ctx.stroke(); ctx.moveTo(36, 500); ctx.lineTo(2528, 500); ctx.stroke(); ctx.moveTo(36, 600); ctx.lineTo(2528, 600); ctx.stroke(); ctx.moveTo(36, 800); ctx.lineTo(2528, 800); ctx.stroke(); ctx.moveTo(36, 950); ctx.lineTo(2528, 950); ctx.stroke(); ctx.moveTo(36, 1100); ctx.lineTo(2528, 1100); ctx.stroke(); ctx.moveTo(36, 1250); ctx.lineTo(2528, 1250); ctx.stroke(); ctx.beginPath(); ctx.strokeStyle = '#FFFF00'; ctx.moveTo((canvasWidth / 2), 0); ctx.lineTo((canvasWidth / 2), canvasHeight); ctx.stroke(); ctx.drawImage(spriteSheets[1], 0, 0, 140, 362, 50, 120, 140, 362); } |
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