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script.js
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script.js
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const canvas = document.getElementById('game');
const context = canvas.getContext('2d');
const startNameplate = document.getElementById('start');
const score = document.getElementById('score');
const scoreResult = document.getElementById('scoreResult');
const missed = document.getElementById('missed');
const missedResult = document.getElementById('missedResult');
const time = document.getElementById('time');
const restart = document.getElementById('restart');
//States
let fullTime = 60
let roundTime = fullTime;
let requestAnimationID;
let stopBallsId;
let stopWindsId;
let ballsSpeed = 1;
let isGameFinished = false;
const grid = 15;
const ballsSpeedBoost = 0.1;
const needleSpeedBoost = 0.1;
let needleSpeed = 6;
const needleHeight = grid * 5;
const needleWidth = grid / 5;
const maxNeedlX = canvas.width - grid;
const needle = {
x: canvas.width / 2 - needleWidth / 2,
y: grid / 3,
width: needleWidth,
height: needleHeight,
dx: 0,
tipY: grid / 3 + needleHeight,
};
let balls = [];
let winds = [];
//-----Functions
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
};
function startGame() {
startNameplate.style.display = 'none';
score.style.display = 'block';
time.textContent = roundTime + 's';
time.style.display = 'block';
timer();
ballsGo();
windsGo();
loop();
};
function timer() {
let timerId = setInterval(() => {
time.textContent = `${--roundTime}s`
}, 1000);
setTimeout(() => {
clearInterval(timerId);
clearInterval(stopBallsId);
clearInterval(stopWindsId);
missed.style.display = 'block'
missedResult.textContent = `${missedBallsCalculation()}`;
isGameFinished = true;
restart.style.display = 'block';
}, roundTime * 1000);
};
function addBall(minTime, maxTime) {
setTimeout(() => {
balls.push({
radius: getRandomInt(20, 50),
x: getRandomInt(0, canvas.width),
y: canvas.height + 50,
color: `rgba(${getRandomInt(0, 255)}, ${getRandomInt(
0,
255
)}, ${getRandomInt(0, 255)}, ${Math.random().toFixed(1)})`,
windsWas: [],
});
}, getRandomInt(minTime, maxTime));
};
function ballsGo() {
stopBallsId = setInterval(() => {
addBall(500, 10000);
if ((fullTime * 2 / 3) >= roundTime) {
addBall(100, 500);
addBall(100, 500);
};
if ((fullTime / 3) >= roundTime) {
addBall(10, 500);
addBall(10, 500);
addBall(10, 500);
};
}, 1000);
};
function windsGo() {
stopWindsId = setInterval(() => {
setTimeout(() => {
const side = Math.round(Math.random());
winds.push({
id: winds.length + 1,
x: side ? canvas.width : 0,
side: side ? 'right' : 'left',
strength: 100,
})
}, getRandomInt(5000, 20000));
}, 5000);
};
function ballsCreator(ballsRadius, x, y, color) {
if (x - ballsRadius < 0) {
x = ballsRadius;
} else if (x + ballsRadius > canvas.width) {
x = canvas.width - ballsRadius;
}
context.save();
context.beginPath();
context.arc(x, y, ballsRadius, 0, Math.PI * 2);
context.strokeStyle = color;
context.stroke();
context.fillStyle = color;
context.fill();
context.closePath();
context.restore();
};
function collideBalls(needle, ball) {
let distanceX = needle.x - ball.x;
let distanceY = needle.tipY - ball.y;
if (
Math.pow(distanceX, 2) + Math.pow(distanceY, 2) <=
Math.pow(ball.radius, 2)
) return true;
return false;
};
function windCreator(x) {
context.beginPath();
context.moveTo(x, 0);
context.lineWidth = 5;
context.lineTo(x, canvas.height);
context.strokeStyle = 'blue';
context.stroke();
};
function missedBallsCalculation() {
return balls.filter((item) => (item?.y + item?.radius) < (needle.height + needle.y)).length
}
function needleCreate() {
context.beginPath();
context.moveTo(needle.x, needle.y);
context.lineWidth = needle.width;
context.lineCap = 'round';
context.lineTo(needle.x, needle.tipY);
context.strokeStyle = 'silver';
context.stroke();
}
//---------
//main loop
function loop() {
requestAnimationID = requestAnimationFrame(loop);
context.clearRect(0, 0, canvas.width, canvas.height);
//Needle moving
needle.x += needle.dx;
//Checking boders.
if (needle.x < grid) {
needle.x = grid;
} else if (needle.x > maxNeedlX) {
needle.x = maxNeedlX;
}
//Drawing needle.
needleCreate()
for (let i = 0; i < balls.length; i++) {
if (balls[i]) {
ballsCreator(balls[i].radius, balls[i].x, balls[i].y, balls[i].color);
balls[i].y -= ballsSpeed;
if (collideBalls(needle, balls[i])) {
ballsSpeed += ballsSpeedBoost;
needleSpeed += needleSpeedBoost;
delete balls[i];
if (!isGameFinished) {
scoreResult.textContent = `${+scoreResult.textContent + 1}`;
}
}
}
}
for (let i = 0; i < winds.length; i++) {
if (winds[i].side === 'right') {
windCreator(winds[i].x);
if (winds[i].x !== -7.5) {
winds[i].x -= 7.5;
winds[i].strength -= 1;
}
} else {
windCreator(winds[i].x);
if (winds[i].x !== 757.5) {
winds[i].x += 7.5;
winds[i].strength -= 1;
}
}
}
for (let i = 0; i < winds.length; i++) {
balls.forEach((item) => {
let isBlowed = item.windsWas.find((item) => item === winds[i].id);
if (winds[i].side === 'right' && !isBlowed && winds[i].x <= item.x) {
item.x -= winds[i].strength;
item.windsWas.push(winds[i].id);
} else if (winds[i].side === 'left' && !isBlowed && winds[i].x >= item.x) {
item.x += winds[i].strength;
item.windsWas.push(winds[i].id);
}
})
}
};
//Events
document.addEventListener('keydown', function (e) {
if (e.code === 'Enter') {
startGame();
}
});
document.addEventListener('keydown', function (e) {
if (e.code === 'KeyA' || e.code === 'ArrowLeft') {
needle.dx = -needleSpeed;
} else if (e.code === 'KeyD' || e.code === 'ArrowRight') {
needle.dx = needleSpeed;
}
});
document.addEventListener('keyup', function (e) {
if (
e.code === 'KeyA' ||
e.code === 'ArrowLeft' ||
e.code === 'KeyD' ||
e.code === 'ArrowRight'
) {
needle.dx = 0;
}
});
document.addEventListener('keypress', function (e) {
if (isGameFinished && e.code === 'KeyR') {
balls = [];
winds = [];
ballsSpeed = 1;
needleSpeed = 6;
isGameFinished = false;
roundTime = fullTime;
restart.style.display = 'none';
missed.style.display = 'none';
scoreResult.textContent = '0';
cancelAnimationFrame(requestAnimationID);
startGame();
}
});