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script.js
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script.js
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var canvas;
var canvasContext;
var ballX = 50;
var ballY = 50;
var ballSpeedX = 10;
var ballSpeedY = 4;
var ballRadius = 10;
var paddle1Y = 250;
var paddle2Y = 250;
const PADDLE_THICKNESS = 10;
const PADDLE_HEIGHT = 100;
const WINNING_SCORE = 3;
const INITIAL_SPEED_Y = 4;
var showWinScreen = false;
var player1Score = 0;
var player2Score = 0;
function calculateMousePosition(evt) {
var rect = canvas.getBoundingClientRect();
var root = document.documentElement;
var mouseX = evt.clientX - rect.left - root.scrollLeft;
var mouseY = evt.clientY - rect.top - root.scrollTop;
return {
x: mouseX,
y: mouseY
};
}
function computerMovement() {
var paddle2yCenter = paddle2Y + (PADDLE_HEIGHT / 2);
if (paddle2yCenter < ballY - 25) {
paddle2Y += 10;
} else if (paddle2Y > ballY + 25) {
paddle2Y -= 10;
}
}
function handleMouseClick(evt) {
if (showWinScreen) {
player1Score = 0;
player2Score = 0;
showWinScreen = false;
}
}
window.onload = function () {
canvas = document.getElementById('gameCanvas');
canvasContext = canvas.getContext('2d');
var framesPerSecond = 30;
setInterval(function () {
moveEverything();
drawEverything();
}, 1000 / framesPerSecond);
canvas.addEventListener('mousemove', function (evt) {
var mousePos = calculateMousePosition(evt);
paddle1Y = mousePos.y - (PADDLE_HEIGHT / 2);
});
canvas.addEventListener('mousedown', handleMouseClick);
}
function ballReset() {
if (player1Score >= WINNING_SCORE || player2Score >= WINNING_SCORE) {
showWinScreen = true;
}
ballSpeedX = -ballSpeedX;
ballX = canvas.width / 2;
ballY = canvas.height / 2;
ballSpeedY = INITIAL_SPEED_Y;
}
function moveEverything() {
if (showWinScreen) {
return;
}
computerMovement();
if (ballX + ballRadius > canvas.width) {
if (ballY > paddle2Y && ballY < paddle2Y + PADDLE_HEIGHT) {
ballSpeedX = -ballSpeedX;
let deltaY = ballY - (paddle1Y + PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.15;
} else {
player1Score++;
ballReset();
}
} else if (ballX - ballRadius < 0) {
if (ballY > paddle1Y && ballY < paddle1Y + PADDLE_HEIGHT) {
ballSpeedX = -ballSpeedX;
let deltaY = ballY - (paddle2Y + PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.15;
} else {
player2Score++;
ballReset();
}
}
if (ballY + ballRadius > canvas.height || ballY - ballRadius < 0) {
ballSpeedY = -ballSpeedY;
}
ballX += ballSpeedX;
ballY += ballSpeedY;
}
function colorRect(leftX, topY, width, height, drawColor) {
canvasContext.fillStyle = drawColor;
canvasContext.fillRect(leftX, topY, width, height);
}
function colorCircle(centerX, centerY, radius, color) {
canvasContext.fillStyle = color;
canvasContext.beginPath();
canvasContext.arc(centerX, centerY, radius, 0, Math.PI * 2, true)
canvasContext.fill();
}
function drawNet() {
for (let i = 0; i < canvas.height; i+=40) {
colorRect(canvas.width/2-1, i, 2, 20, 'white')
}
}
function drawEverything() {
// Make all black
colorRect(0, 0, canvas.width, canvas.height, 'black');
canvasContext.fillStyle = 'white';
canvasContext.fillText("Player1", 90, 20);
canvasContext.fillText("Computer", canvas.width - 90, 20);
canvasContext.fillText(player1Score, 90, 40);
canvasContext.fillText(player2Score, canvas.width - 90, 40);
if (showWinScreen) {
canvasContext.fillStyle = 'white';
if (player1Score >= WINNING_SCORE) {
canvasContext.fillText("Left Player Won!", 350, 200);
} else if (player2Score >= WINNING_SCORE) {
canvasContext.fillText("Right Player Won!", 350, 200);
}
canvasContext.fillText("Click to continue", 350, 500)
return;
}
drawNet();
//left player paddle
colorRect(0, paddle1Y, PADDLE_THICKNESS, PADDLE_HEIGHT, 'white');
//right player paddle
colorRect(canvas.width - PADDLE_THICKNESS, paddle2Y, PADDLE_THICKNESS, PADDLE_HEIGHT, 'white');
//draw the ball
colorCircle(ballX, ballY, ballRadius, 'white');
}