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pong.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<meta content="utf-8" http-equiv="encoding">
</head>
<body>
<a href="index.html">Return to Main Page</a>
<p></p>
<canvas id="gameCanvas" width="800" height="600"></canvas>
<script>
var canvas;
var canvasContext;
var ballX = 50;
var ballY = 50;
var ballSpeedX = 10;
var ballSpeedY = 4;
var paddle1Y = 250;
var paddle2Y = 250;
const PADDLE_HEIGHT = 100;
const PADDLE_WIDTH = 10;
var player1Score = 0;
var player2Score = 0;
const WINNING_SCORE = 3;
var showWinScreen = false;
function calculateMousePos(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 handleMouseClick(evt) {
if (showWinScreen) {
player1Score = 0;
player2Score = 0;
showWinScreen = false;
}
}
window.onload = function() {
canvas = document.getElementById('gameCanvas');
canvasContext = canvas.getContext('2d');
const FRAMES_PER_SECOND = 30;
setInterval(function() {
moveEverything();
drawEverything();
}, 1000/FRAMES_PER_SECOND);
canvas.addEventListener('mousedown', handleMouseClick);
canvas.addEventListener('mousemove',
function(evt) {
var mousePos = calculateMousePos(evt);
paddle1Y = mousePos.y - (PADDLE_HEIGHT/2);
// paddle2Y = mousePos.y - (PADDLE_HEIGHT/2);
});
}
function ballReset() {
if (player1Score >= WINNING_SCORE ||
player2Score >= WINNING_SCORE) {
showWinScreen = true;
}
ballSpeedX = -ballSpeedX;
ballX = canvas.width/2;
ballY = canvas.height/2;
}
function computerMovement() {
var paddle2YCenter = paddle2Y + (PADDLE_HEIGHT/2);
if (paddle2YCenter < ballY - 35) {
paddle2Y += 6;
} else if (paddle2YCenter > ballY + 35) {
paddle2Y -= 6;
}
}
function moveEverything() {
if (showWinScreen) {
return;
}
computerMovement();
ballX += ballSpeedX;
ballY += ballSpeedY;
if (ballX >= canvas.width - PADDLE_WIDTH) {
if (ballY > paddle2Y &&
ballY < paddle2Y + PADDLE_HEIGHT) {
ballSpeedX = -ballSpeedX;
var deltaY = ballY - (paddle2Y + PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.35;
} else {
player1Score++;
ballReset();
}
}
if (ballX <= PADDLE_WIDTH) {
if (ballY > paddle1Y &&
ballY < paddle1Y + PADDLE_HEIGHT) {
ballSpeedX = -ballSpeedX;
var deltaY = ballY - (paddle1Y + PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.35;
} else {
player2Score++;
ballReset();
}
}
if (ballY > canvas.height - 10) {
ballSpeedY = -ballSpeedY;
} else if (ballY < 10) {
ballSpeedY = -ballSpeedY;
}
}
function drawNet() {
for (var i = 0; i < canvas.height; i += 40) {
colorRect(canvas.width/2 - 1, i, 2, 20, 'white');
}
}
function drawEverything() {
// Draws black screen
colorRect(0, 0, canvas.width, canvas.height, 'black');
if (showWinScreen) {
canvasContext.fillStyle = 'white';
if (player1Score >= WINNING_SCORE) {
canvasContext.fillText("Left Player Wins!", 350, 200);
} else {
canvasContext.fillText("Right Player Wins!", 350, 200);
}
canvasContext.fillText("Click to continue.", 350, 500);
return;
}
drawNet();
// Draws left player paddle
colorRect(0, paddle1Y, PADDLE_WIDTH, PADDLE_HEIGHT, 'white');
// Draws right player paddle
colorRect(canvas.width - PADDLE_WIDTH, paddle2Y, PADDLE_WIDTH, PADDLE_HEIGHT, 'white');
// Draws ball
colorCircle(ballX, ballY, 10, 'white');
canvasContext.fillText(player1Score, 100, 100);
canvasContext.fillText(player2Score, canvas.width - 100, 100);
}
function colorCircle(centerX, centerY, radius, drawColor) {
canvasContext.fillStyle = drawColor;
canvasContext.beginPath();
canvasContext.arc(centerX, centerY, radius, 0, Math.PI*2, true);
canvasContext.fill();
}
function colorRect(leftX, topY, width, height, drawColor) {
canvasContext.fillStyle = drawColor;
canvasContext.fillRect(leftX, topY, width, height);
}
</script>
</body>
</html>