Created
October 8, 2019 19:59
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JS Snake
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge" /> | |
| <title>Snake</title> | |
| </head> | |
| <body> | |
| <canvas id="game" width="400" height="400"></canvas> | |
| <h1 id="score"></h1> | |
| <script> | |
| let titleScore = document.getElementById("score"); | |
| window.onload = () => { | |
| canvas = document.getElementById("game"); | |
| context = canvas.getContext("2d"); | |
| document.addEventListener("keydown", keyPush); | |
| setInterval(game, 1000 / 15); | |
| }; | |
| let playerX = 10; | |
| let playerY = 10; | |
| let gridSize = 20; | |
| let tailCount = 20; | |
| let appleX = Math.floor(Math.random() * tailCount); | |
| let appleY = Math.floor(Math.random() * tailCount); | |
| let xVelocity = 0; | |
| let yVelocity = 0; | |
| let trail = []; | |
| let tail = 5; | |
| const game = () => { | |
| playerX += xVelocity; | |
| playerY += yVelocity; | |
| if (playerX < 0) { | |
| playerX = tailCount - 1; | |
| } | |
| if (playerX > tailCount - 1) { | |
| playerX = 0; | |
| } | |
| if (playerY < 0) { | |
| playerY = tailCount - 1; | |
| } | |
| if (playerY > tailCount - 1) { | |
| playerY = 0; | |
| } | |
| context.fillStyle = "black"; | |
| context.fillRect(0, 0, canvas.width, canvas.height); | |
| context.fillStyle = "lime"; | |
| for (let i = 0; i < trail.length; i++) { | |
| context.fillRect(trail[i].x * gridSize, trail[i].y * gridSize, gridSize - 2, gridSize - 2); | |
| if (trail[i].x == playerX && trail[i].y == playerY) { | |
| tail = 5; | |
| titleScore.innerHTML = `Score : ${tail - 5}`; | |
| } | |
| } | |
| trail.push({ x: playerX, y: playerY }); | |
| while (trail.length > tail) { | |
| trail.shift(); | |
| } | |
| if (appleX == playerX && appleY == playerY) { | |
| tail++; | |
| titleScore.innerHTML = `Score : ${tail - 5}`; | |
| appleX = Math.floor(Math.random() * tailCount); | |
| appleY = Math.floor(Math.random() * tailCount); | |
| } | |
| context.fillStyle = "red"; | |
| context.fillRect(appleX * gridSize, appleY * gridSize, gridSize - 2, gridSize - 2); | |
| }; | |
| const keyPush = e => { | |
| switch (e.keyCode) { | |
| case 37: | |
| xVelocity = -1; | |
| yVelocity = 0; | |
| break; | |
| case 38: | |
| xVelocity = 0; | |
| yVelocity = -1; | |
| break; | |
| case 39: | |
| xVelocity = 1; | |
| yVelocity = 0; | |
| break; | |
| case 40: | |
| xVelocity = 0; | |
| yVelocity = 1; | |
| break; | |
| default: | |
| break; | |
| } | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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