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ping-pong.html
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ping-pong.html
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<html lang="en">
<head>
<meta charset="UTF-8">
<title>Ping Pong</title>
<style>
#pong{
border-radius:50px
}
</style>
</head>
<body>
<canvas id="pong" width="850" height="650" ></canvas>
<script>
var test;
const cvs = document.getElementById('pong');
const cxt = cvs.getContext('2d');
// create user paddle
const user = {
x : 0,
y : cvs.height/2 - 100/2,
width : 10,
height : 100,
color : "white",
score : 0
}
// create com paddle
const com = {
x : cvs.width - 10,
y : cvs.height/2 - 100/2,
width : 10,
height : 100,
color: "white",
score : 0
}
// create the ball
const ball = {
x : cvs.width/2,
y : cvs.height/2,
radius : 20,
speed : 5,
velocityX :5,
velocityY :5,
color : "white"
}
// draw rect function
function drawRect(x, y, w, h, color ){
cxt.fillStyle = color;
cxt.fillRect(x,y,w,h);
}
// create the net
const net = {
x : cvs.width/2 -1,
y : 0,
width : 2,
height : 10,
color : "white"
}
// draw the net
function drawNet(){
for(let i = 0; i <= cvs.height; i+=15){
drawRect(net.x, net.y + i, net.width, net.height, net.color);
}
}
// draw circle function
function drawCircle(x,y,r,color){
cxt.fillStyle = color;
cxt.beginPath();
cxt.arc(x, y, r,0, Math.PI*2, false);
cxt.closePath();
cxt.fill();
}
// draw Text
function drawText(text,x,y,color){
cxt.fillStyle = color;
cxt.font = "45px fantasy";
cxt.fillText(text,x,y);
}
// render the game
function render(){
// clear the canvas
drawRect(0,0, cvs.width, cvs.height, "black");
// draw the net
drawNet();
// draw score
drawText(user.score,cvs.width/4,cvs.height/5,"white");
drawText(com.score,3*cvs.width/4,cvs.height/5,"white");
// draw the user and com paddle
drawRect(user.x, user.y, user.width, user.height, user.color);
drawRect(com.x, com.y, com.width, com.height, com.color);
//draw the circle
drawCircle(ball.x, ball.y, ball.radius, ball.color);
}
// control the user paddle
cvs.addEventListener("mousemove",movePaddle);
function movePaddle(evt){
let rect = cvs.getBoundingClientRect();
user.y = evt.clientY - rect.top - user.height/2;
}
// colission detection
function collision(b,p){
b.top = b.y - b.radius;
b.bottom = b.y + b.radius;
b.left = b.x - b.radius;
b.right = b.x + b.radius;
p.top = p.y;
p.bottom = p.y + p.height;
p.left = p.x;
p.right = p.x + p.width;
return b.right > p.left && b.bottom > p.top && b.left < p.right && b.top < p.bottom;
}
//reset ball
function resetBall(){
ball.x = cvs.width/2;
ball.y = cvs.height/2;
ball.speed = 5;
ball.velocityX = -ball.velocityX;
}
// update function
function update(){
ball.x += ball.velocityX;
ball.y += ball.velocityY;
// simple ai
let computerLevel = 0.1;
com.y += (ball.y - (com.y + com.height/2)) * computerLevel;
if( ball.y + ball.radius > cvs.height || ball.y - ball.radius < 0){
ball.velocityY = -ball.velocityY;
}
let player = (ball.x < cvs.width/2) ? user : com;
if(collision(ball,player)){
let collidePoint = ball.y - (player.y + player.height/2);
collidePoint = collidePoint/(player.height/2);
let angleRad = collidePoint * Math.PI/4;
let direction = (ball.x < cvs.width/2) ? 1 : -1;
ball.velocityX = direction * ball.speed * Math.cos(angleRad);
ball.velocityY = ball.speed * Math.sin(angleRad);
ball.speed += 0.5;
}
if(ball.x - ball.radius < 0){
com.score++;
resetBall();
}else if (ball.x + ball.radius > cvs.width){
user.score++;
resetBall();
}
}
//game int
function game(){
update()
render();
}
//loop
const framePerSeccond = 50;
setInterval(game,1000/framePerSeccond);
</script>
</body>
</html>