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game.html
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game.html
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<html>
<canvas id="gameCanvas" width="800" height="600">
</canvas>
<script>
//Canvas
var canvas;
var canvasContext;
//Ball positioning
var ballX = 395;
var ballY = 295;
var ballSpeedX = 10;
var ballSpeedY = 10;
//Paddle positioning
const PADDLE_HEIGHT = 100;
const PADDLE_WIDTH = 10;
var paddle1Y = 295;
var paddle2Y = 250;
//Scores
var player1 = 0;
var player2 = 0;
const WIN = 3;
var showWinScreen = false;
function calMousePos(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){
player1=0;
player2=0;
showWinScreen=false;
}
}
window.onload = function(){
canvas = document.getElementById('gameCanvas');
canvasContext = canvas.getContext('2d');
var fps = 30;
setInterval(function(){
drawEverything();
moveEverything();
}, 1000/fps);
canvas.addEventListener('mousemove',
function(evt){
var mousePos = calMousePos(evt);
paddle1Y = mousePos.y-50;
})
canvas.addEventListener('mousedown', handleMouseClick)
}
function ballReset(){
if(player1 >= WIN || player2 >= WIN) showWinScreen= true;
ballX = canvas.width/2;
ballY = canvas.height/2;
ballSpeedX *= -1;
}
function computerMovement(){
var center = paddle2Y + PADDLE_HEIGHT/2;
if(center < ballY-35) paddle2Y +=6;
else if(center > ballY+35) paddle2Y -= 6;
}
function moveEverything(){
if(showWinScreen) return;
computerMovement();
ballX += ballSpeedX;
ballY += ballSpeedY;
//Right side
if (ballX < 0) {
if(( ballY > paddle1Y) && (ballY < paddle1Y+PADDLE_HEIGHT)){
ballSpeedX *= -1;
var deltaY = ballY - (paddle1Y+PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.35;
} else {
player2++;
ballReset();
}
}
//Left side
if (ballX > canvas.width) {
if(( ballY > paddle2Y) && (ballY < paddle2Y+PADDLE_HEIGHT)) {
ballSpeedX *= -1;
var deltaY = ballY - (paddle2Y+PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.35;
} else {
player1++;
ballReset();
}
}
if (ballY > canvas.height-PADDLE_WIDTH || ballY < 0 ) ballSpeedY *= -1;
}
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'); //Background
if(showWinScreen) {
canvasContext.fillStyle = 'white';
if ( player1 >= WIN )canvasContext.fillText("Player 1 won!", 350 ,100);
else if ( player2 >= WIN) canvasContext.fillText("Player 2 won!", 350 ,100);
canvasContext.fillText("Click to continue", 350 ,500)
return;
}
colorRect(0, paddle1Y, PADDLE_WIDTH, PADDLE_HEIGHT, 'white'); //Paddle 1
colorRect(canvas.width-PADDLE_WIDTH, paddle2Y, PADDLE_WIDTH, PADDLE_HEIGHT, 'white'); //Paddle 2
drawNet();
colorCircle(ballX, ballY, 5,' white'); //Ball
canvasContext.fillText(player1, 100, 100); //Player 1 score
canvasContext.fillText(player2, canvas.width-100,100); //Player 2 score
}
function colorRect(x, y, width, height, color){
canvasContext.fillStyle = color;
canvasContext.fillRect(x, y, width, height);
}
function colorCircle(x, y, radius, color){
canvasContext.fillStyle = color;
canvasContext.beginPath();
canvasContext.arc(x, y, radius, 0, Math.PI*2, true);
canvasContext.fill();
}
</script>
</html>