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app.js
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app.js
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document.addEventListener('DOMContentLoaded', () => {
const grid = document.querySelector('.grid')
let squares = Array.from(document.querySelectorAll('.grid div'))
const scoreDisplay = document.querySelector('#score')
const startBtn = document.querySelector('#start-button')
const width = 10
let nextRandom = 0
let timerId
let score = 0
const colors = [
'orange',
'red',
'purple',
'green',
'blue'
]
//The Tetrominoes
const lTetromino = [
[1, width+1, width*2+1, 2],
[width, width+1, width+2, width*2+2],
[1, width+1, width*2+1, width*2],
[width, width*2, width*2+1, width*2+2]
]
const zTetromino = [
[0,width,width+1,width*2+1],
[width+1, width+2,width*2,width*2+1],
[0,width,width+1,width*2+1],
[width+1, width+2,width*2,width*2+1]
]
const tTetromino = [
[1,width,width+1,width+2],
[1,width+1,width+2,width*2+1],
[width,width+1,width+2,width*2+1],
[1,width,width+1,width*2+1]
]
const oTetromino = [
[0,1,width,width+1],
[0,1,width,width+1],
[0,1,width,width+1],
[0,1,width,width+1]
]
const iTetromino = [
[1,width+1,width*2+1,width*3+1],
[width,width+1,width+2,width+3],
[1,width+1,width*2+1,width*3+1],
[width,width+1,width+2,width+3]
]
const theTetrominoes = [lTetromino, zTetromino, tTetromino, oTetromino, iTetromino]
let currentPosition = 4
let currentRotation = 0
console.log(theTetrominoes[0][0])
//randomly select a Tetromino and its first rotation
let random = Math.floor(Math.random()*theTetrominoes.length)
let current = theTetrominoes[random][currentRotation]
//draw the Tetromino
function draw() {
current.forEach(index => {
squares[currentPosition + index].classList.add('tetromino')
squares[currentPosition + index].style.backgroundColor = colors[random]
})
}
//undraw the Tetromino
function undraw() {
current.forEach(index => {
squares[currentPosition + index].classList.remove('tetromino')
squares[currentPosition + index].style.backgroundColor = ''
})
}
//assign functions to keyCodes
function control(e) {
if(e.keyCode === 37) {
moveLeft()
} else if (e.keyCode === 38) {
rotate()
} else if (e.keyCode === 39) {
moveRight()
} else if (e.keyCode === 40) {
moveDown()
}
}
document.addEventListener('keyup', control)
//move down function
function moveDown() {
undraw()
currentPosition += width
draw()
freeze()
}
//freeze function
function freeze() {
if(current.some(index => squares[currentPosition + index + width].classList.contains('taken'))) {
current.forEach(index => squares[currentPosition + index].classList.add('taken'))
//start a new tetromino falling
random = nextRandom
nextRandom = Math.floor(Math.random() * theTetrominoes.length)
current = theTetrominoes[random][currentRotation]
currentPosition = 4
draw()
displayShape()
addScore()
gameOver()
}
}
//move the tetromino left, unless is at the edge or there is a blockage
function moveLeft() {
undraw()
const isAtLeftEdge = current.some(index => (currentPosition + index) % width === 0)
if(!isAtLeftEdge) currentPosition -=1
if(current.some(index => squares[currentPosition + index].classList.contains('taken'))) {
currentPosition +=1
}
draw()
}
//move the tetromino right, unless is at the edge or there is a blockage
function moveRight() {
undraw()
const isAtRightEdge = current.some(index => (currentPosition + index) % width === width -1)
if(!isAtRightEdge) currentPosition +=1
if(current.some(index => squares[currentPosition + index].classList.contains('taken'))) {
currentPosition -=1
}
draw()
}
//rotate the tetromino
function rotate() {
undraw()
currentRotation ++
if(currentRotation === current.length) { //if the current roation gets to 4, make it go back to 0
currentRotation = 0
}
current = theTetrominoes[random][currentRotation]
draw()
}
//show up-next tetromino in mini-grid display
const displaySquares = document.querySelectorAll('.mini-grid div')
const displayWidth = 4
const displayIndex = 0
//the Tetrominos without rotations
const upNextTetrominoes = [
[1, displayWidth+1, displayWidth*2+1, 2], //lTetromino
[0, displayWidth, displayWidth+1, displayWidth*2+1], //zTetromino
[1, displayWidth, displayWidth+1, displayWidth+2], //tTetromino
[0, 1, displayWidth, displayWidth+1], //oTetromino
[1, displayWidth+1, displayWidth*2+1, displayWidth*3+1] //iTetromino
]
//display the shape in the mini-grid display
function displayShape() {
//remove any trace of a tetromino form the entire grid
displaySquares.forEach(square => {
square.classList.remove('tetromino')
square.style.backgroundColor = ''
})
upNextTetrominoes[nextRandom].forEach( index => {
displaySquares[displayIndex + index].classList.add('tetromino')
displaySquares[displayIndex + index].style.backgroundColor = colors[nextRandom]
})
}
//add functionality to the button
startBtn.addEventListener('click', () => {
if (timerId) {
clearInterval(timerId)
timerId = null
} else {
draw()
timerId = setInterval(moveDown, 1000)
nextRandom = Math.floor(Math.random()*theTetrominoes.length)
displayShape()
}
})
//add score
function addScore() {
for (let i = 0; i < 199; i +=width) {
const row = [i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9]
if(row.every(index => squares[index].classList.contains('taken'))) {
score +=10
scoreDisplay.innerHTML = score
row.forEach(index => {
squares[index].classList.remove('taken')
squares[index].classList.remove('tetromino')
squares[index].style.backgroundColor = ''
})
const squaresRemoved = squares.splice(i, width)
squares = squaresRemoved.concat(squares)
squares.forEach(cell => grid.appendChild(cell))
}
}
}
//game over
function gameOver() {
if(current.some(index => squares[currentPosition + index].classList.contains('taken'))) {
scoreDisplay.innerHTML = 'end'
clearInterval(timerId)
}
}
})