Focus the scene, and use the arrow keys to move.
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Superbox
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="scene"></div> | |
| <script src="scene.js"></script> | |
| <script src="player.js"></script> | |
| <script> | |
| let left = 0, right = 0, up = 0; | |
| const myScene = new Scene; | |
| myScene.init("#scene"); | |
| const myPlayer = new Player; | |
| myPlayer.init({width: 100, height: 100, y: myScene.height}); | |
| myScene.addPlayer(myPlayer); | |
| function tick(){ | |
| requestAnimationFrame(tick); | |
| myScene.movePlayer({left, right, up}); | |
| myScene.draw(); | |
| } | |
| tick(); | |
| addEventListener("keydown", e => { | |
| if (e.code === "ArrowLeft") { left = 1; right = 0; } | |
| if (e.code === "ArrowRight") { right = 1; left = 0; } | |
| if (e.code === "ArrowUp") up = 1; | |
| }); | |
| addEventListener("keyup", e => { | |
| if (e.code === "ArrowLeft") left = 0; | |
| if (e.code === "ArrowRight") right = 0; | |
| if (e.code === "ArrowUp") up = 0; | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| class Player { | |
| init(opts){ | |
| this.width = opts && opts.width ? opts.width : 20; | |
| this.height = opts && opts.height ? opts.height : 20; | |
| this.x = opts && opts.x ? opts.x : 0; | |
| this.y = opts && opts.y ? opts.y : 0; | |
| this.vy = 0; | |
| this.agility = opts && opts.agility ? opts.agility : 5; | |
| this.jumpPower = opts && opts.jumpPower ? opts.jumpPower : 20; | |
| this.jumping = 0; | |
| } | |
| } |
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| class Scene { | |
| init(elem, opts){ | |
| this.elem = elem; | |
| this.gravity = opts && opts.gravity ? opts.gravity : 1.5; | |
| this.sel = document.querySelector(this.elem); | |
| this.canvas = document.createElement("canvas"); | |
| this.canvas.style.background = "lightblue"; | |
| this.context = this.canvas.getContext("2d"); | |
| this.sel.appendChild(this.canvas); | |
| this.resize(); | |
| } | |
| addPlayer(player){ | |
| this.player = player; | |
| } | |
| movePlayer(dirs){ | |
| if (!this.player) { | |
| console.error("You need to add a player with scene.addPlayer(player) before trying to move it."); | |
| return null; | |
| } | |
| if (dirs.right){ | |
| this.player.x += Math.min(this.player.agility, this.width - (this.player.x + this.player.width)); | |
| } | |
| if (dirs.left){ | |
| this.player.x -= Math.min(this.player.agility, this.player.x); | |
| } | |
| if (dirs.up && !this.player.jumping){ | |
| this.player.jumping = true; | |
| this.player.vy = this.player.jumpPower; | |
| } | |
| if (this.player.jumping){ | |
| this.player.vy -= this.gravity; | |
| this.player.y -= this.player.vy; | |
| if (this.player.y - this.player.height < 0){ | |
| this.player.y = this.player.height; | |
| this.player.vy = 0; | |
| } | |
| if (this.player.y >= this.height){ | |
| this.player.y = this.height; | |
| this.player.vy = 0; | |
| this.player.jumping = false; | |
| } | |
| } | |
| } | |
| resize(){ | |
| this.width = innerWidth; | |
| this.height = innerHeight; | |
| } | |
| draw(){ | |
| this.resize(); | |
| this.canvas.width = this.width; | |
| this.canvas.height = this.height; | |
| this.context.clearRect(0, 0, this.width, this.height) | |
| if (this.player){ | |
| this.context.fillStyle = "steelblue"; | |
| this.context.fillRect(this.player.x, this.player.y - this.player.height, this.player.width, this.player.height); | |
| } | |
| } | |
| } |
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