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script.js
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script.js
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const canvas = document.querySelector('canvas')
const context = canvas.getContext('2d')
console.log(navigator);
let userWidth, userHeight
let direcao = 'y'
let snakeTail = []
let positionTail = {}
let touchs = []
const snakeHead = {
width: 1,
height: 1,
color: 'green',
velocity: 1,
position: {
x: 15,
y: 15
}
}
const food = {
width: 1,
height: 1,
color: 'red',
position: {
x: Math.floor(Math.random() * 30),
y: Math.floor(Math.random() * 30)
}
}
document.addEventListener('keydown', e => chageMoviment(e))
document.addEventListener('touchstart', e => catchTouchStart(e.changedTouches[0].pageX, e.changedTouches[0].pageY))
document.addEventListener('touchend', e => catchEndTouch(e.changedTouches[0].pageX, e.changedTouches[0].pageY))
function catchTouchStart(x, y) {
touchs.splice(0, 2)
let touchStart = { x, y }
touchs.push(touchStart)
}
function catchEndTouch(x, y) {
let endTouch = { x, y }
touchs.push(endTouch)
let moduleX = touchs[1].x - touchs[0].x
let moduleY = touchs[1].y - touchs[0].y
if (Math.abs(moduleX) > Math.abs(moduleY)) {
if (direcao != 'x') {
direcao = 'x'
if (moduleX < 0) {
moviment = e => snakeHead.position.x -= snakeHead.velocity
} else {
moviment = e => snakeHead.position.x += snakeHead.velocity
}
}
} else {
if (direcao != 'y') {
direcao = 'y'
if (moduleY < 0) {
moviment = e => snakeHead.position.y -= snakeHead.velocity
} else {
moviment = e => snakeHead.position.y += snakeHead.velocity
}
}
}
}
function drawBackground() {
userWidth = window.innerWidth
userHeight = window.innerHeight
canvas.width = Math.floor(userWidth / 10)
canvas.height = Math.floor(userHeight / 10)
}
function drawHead() {
context.fillStyle = snakeHead.color
context.fillRect(snakeHead.position.x, snakeHead.position.y, snakeHead.width, snakeHead.height)
}
function drawFood() {
context.fillStyle = food.color
context.fillRect(food.position.x, food.position.y, food.width, food.height)
}
function drawTail() {
for (a in snakeTail) {
context.fillStyle = snakeHead.color
context.fillRect(snakeTail[a].x, snakeTail[a].y, snakeHead.width, snakeHead.height)
}
}
function rules() {
if (snakeHead.position.x >= Math.floor(userWidth / 10)) {
snakeHead.position.x = 0
}
if (snakeHead.position.x < 0) {
snakeHead.position.x = Math.floor(userWidth / 10) - 1
}
if (snakeHead.position.y < 0) {
snakeHead.position.y = Math.floor(userHeight / 10) - 1
}
if (snakeHead.position.y >= Math.floor(userHeight / 10)) {
snakeHead.position.y = 0
}
for (a in snakeTail) {
if (snakeHead.position.x == snakeTail[a].x && snakeHead.position.y == snakeTail[a].y) {
snakeTail.splice(1, snakeTail.length)
}
}
}
let moviment = function () {
snakeHead.position.y -= snakeHead.velocity
}
function chageMoviment(e) {
switch (e.key) {
case 'ArrowUp':
if (direcao != 'y') {
moviment = e => snakeHead.position.y -= snakeHead.velocity
direcao = 'y'
}
break
case 'ArrowDown':
if (direcao != 'y') {
moviment = e => snakeHead.position.y += snakeHead.velocity
direcao = 'y'
}
break
case 'ArrowRight':
if (direcao != 'x') {
moviment = e => snakeHead.position.x += snakeHead.velocity
direcao = 'x'
}
break
case 'ArrowLeft':
if (direcao != 'x') {
moviment = e => snakeHead.position.x -= snakeHead.velocity
direcao = 'x'
}
break
}
}
function eatFood() {
if (snakeHead.position.x == food.position.x && snakeHead.position.y == food.position.y) {
food.position.x = Math.floor(Math.random() * userWidth / 10)
food.position.y = Math.floor(Math.random() * userHeight / 10)
} else {
snakeTail.pop()
}
}
function render() {
drawBackground()
rules()
drawFood()
positionTail = {
x: snakeHead.position.x,
y: snakeHead.position.y
}
snakeTail.unshift(positionTail)
moviment()
drawHead()
drawTail()
eatFood()
}
setInterval(render, 50)