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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 h3score = document.querySelector('#h3-score')
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' ]
const lTetromino = [
[1, width+1, width*2+1, 2], // B1, B2, B3, C1; these are indexs in one long array
[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 = [
[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],
[0, width, width+1, 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]
// draw tetromino in (0,4)
let currentPosition = 4
let currentRotation = 0
let random = Math.floor(Math.random()*theTetrominoes.length)
let current = theTetrominoes[random][currentRotation]
function draw() {
current.forEach(index => {
squares[currentPosition + index].classList.add('tetromino')
squares[currentPosition + index].style.backgroundColor = colors[random]
})
}
function undraw() {
current.forEach(index => {
squares[currentPosition + index].classList.remove('tetromino')
squares[currentPosition + index].style.backgroundColor = ''
})
}
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()
} else if (e.keyCode == 32) {
// spacebar
}
}
document.addEventListener('keyup', control)
function moveDown() {
undraw()
currentPosition += width
draw()
freeze()
}
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()
}
}
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()
}
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()
}
function rotate() {
undraw()
currentRotation++
if (currentRotation === current.length) { // if the current rotation gets to 4, make it go back to 0
currentRotation = 0
}
current = theTetrominoes[random][currentRotation]
draw()
}
// show next-up 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 from 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]
})
}
startBtn.addEventListener('click', () => {
if (timerId) {
startBtn.innerHTML = 'Unpause'
clearInterval(timerId)
timerId = null
} else {
startBtn.innerHTML = 'Pause'
draw()
timerId = setInterval(moveDown, 1000)
nextRandom = Math.floor(Math.random()*theTetrominoes.length)
displayShape()
}
})
function addScore() {
let outerRows = 0;
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'))) {
row.forEach( index => {
squares[index].classList.remove('taken')
squares[index].classList.remove('tetromino')
squares[index].style.backgroundColor = ''
})
outerRows++;
score += 10;
scoreDisplay.innerHTML = score;
const squaresRemoved = squares.splice(i, width)
squares = squaresRemoved.concat(squares)
squares.forEach(cell => grid.appendChild(cell))
}
if ( outerRows == 4) {
score += 360;
scoreDisplay.innerHTML = score;
}
}
}
function gameOver() {
if (current.some(index => squares[currentPosition + index].classList.contains("taken"))) {
h3score.innerHTML = 'Final Score: '
h3score.style.color = 'red'
scoreDisplay.style.color = 'red'
startBtn.innerHTML = 'New Game'
clearInterval(timerId)
}
}
})