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tennisgame.html
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tennisgame.html
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<html>
<canvas id="gameCanvas" width="800" height="600"></canvas>
<script>
var canvas;
var canvasContext;
var ballX = 50;
var ballSpeedX = 10;
var ballY = 50;
var ballSpeedY = 4;
var paddle1Y = 250;
var paddle2Y = 250;
const PADDLE_THICKNESS = 10;
const PADDLE_HEIGHT = 100;
const PADDLE_COLOR = 'white';
var player1Score = 0;
var player2Score = 0;
const WINNING_SCORE = 3;
var showingWinScreen = 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(showingWinScreen) {
player1Score = 0;
player2Score = 0;
showingWinScreen = false;
}
}
window.onload = function() {
canvas = document.getElementById("gameCanvas");
canvasContext = canvas.getContext('2d');
var framesPerSecond = 30;
setInterval(function() {
moveEverything();
drawEverything();
}, 1000/framesPerSecond);
canvas.addEventListener('mousedown', handleMouseClick)
canvas.addEventListener('mousemove',
function(evt) {
var mousePos = calculateMousePos(evt);
paddle1Y = mousePos.y - (PADDLE_HEIGHT/2);
});
}
function ballReset() {
if(player1Score >= WINNING_SCORE || player2Score >= WINNING_SCORE) {
showingWinScreen = true;
}
ballSpeedX = -ballSpeedX;
ballX = canvas.width/2;
ballY = canvas.height/2;
}
function computerMove() {
var paddle2YCenter = paddle2Y + (PADDLE_HEIGHT/2);
if(paddle2YCenter < ballY-35) {
paddle2Y += 6;
} else if (paddle2YCenter > ballY+35) {
paddle2Y -= 6;
}
}
function moveEverything() {
if(showingWinScreen) {
return;
}
computerMove();
ballX = ballX + ballSpeedX;
ballY = ballY + ballSpeedY;
if (ballX < 20) {
if ( ballY > paddle1Y && ballY < paddle1Y+PADDLE_HEIGHT) {
ballSpeedX = -ballSpeedX;
var deltaY = ballY - (paddle1Y+PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.35;
} else {
player2Score++;
ballReset();
}
}
if (ballX > canvas.width-PADDLE_THICKNESS) {
if ( ballY > paddle2Y && ballY < paddle2Y+PADDLE_HEIGHT) {
ballSpeedX = -ballSpeedX;
var deltaY = ballY - (paddle2Y+PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.35;
} else {
player1Score++;
ballReset();
}
}
if (ballY > canvas.height) {
ballSpeedY = -ballSpeedY;
}
if (ballY < 0) {
ballSpeedY = -ballSpeedY;
}
}
function drawNet() {
for( var i=0; i<canvas.height; i+=40) {
colorRect(canvas.width/2-1, i, 2, 20, 'white');
}
}
function drawEverything() {
colorRect(0,0,canvas.width,canvas.height, 'black'); // game window
if(showingWinScreen) {
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();
colorRect(0,paddle1Y,PADDLE_THICKNESS,PADDLE_HEIGHT,PADDLE_COLOR); // player A
colorRect(canvas.width-PADDLE_THICKNESS, paddle2Y, PADDLE_THICKNESS, PADDLE_HEIGHT, PADDLE_COLOR); // player B
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>
</html>