I am trying to make a webpage to store all my games on i just started and i've been trying to make a button to load my pong game but when I press the button nothing happens here's my code
<!DOCTYPE html>
<html lang = "en">
<head>
<title>Title</title>
<meta charset="UTF-8">
<style>
canvas {
position: absolute;
margin: auto;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
</style>
</head>
<body>
<center>
<h1>Games</h1>
button code
<input id="Pong" type="button" value="Pong" onclick="go();" />
pong code
<script>
function go(){
var WIDTH = 700, HEIGHT = 600, pi = Math.PI;
var UpArrow = 38, DownArrow = 40;
var canvas, ctx, keystate;
var player, ai, ball, score;
player = {
x: null,
y: null,
width: 20,
height: 100,
update: function(){
if(keystate[UpArrow]) this.y -= 7;
if(keystate[DownArrow]) this.y += 7;
},
draw: function(){
ctx.fillRect(this.x, this.y, this.width, this.height);
}
};
ai = {
x: null,
y: null,
width: 20,
height: 100,
update: function(){
var desty = ball.y - (this.height - ball.side)*0.5;
this.y += (desty - this.y) * 0.1;
},
draw: function(){
ctx.fillRect(this.x, this.y, this.width, this.height);
}
};
ball = {
x: null,
y: null,
vel: null,
side: 20,
speed: 9,
serve: function(side){
var r = Math.random();
this.x = side===1 ? player.x : ai.x - this.side;
this.y = (HEIGHT - this.side)*r;
score.count += 1;
var phi = 0.1*pi*(1 - 2*r);
this.vel = {
x: side*this.speed*Math.cos(phi),
y: this.speed*Math.sin(phi)
};
score = {
x: null,
y: null,
count: 0,
width: 10,
height: 10,
update: function(){
Console.log(this.count);
},
draw: function(){
ctx.fillRect(this.x, this.y, this.width, this.height);
}
};
},
update: function(){
this.x += this.vel.x;
this.y += this.vel.y;
if(0 > this.y || this.y+this.side > HEIGHT){
var offset = this.vel.y < 0 ? 0 - this.y : HEIGHT - (this.y+this.side);
this.y += 2*offset;
this.vel.y *= -1;
}
var AABBIntersect = function(ax, ay, aw, ah, bx, by, bw, bh){
return ax < bx+bw && ay < by+bh && bx < ax+aw && by < ay+ah;
};
var pdle = this.vel.x < 0 ? player : ai;
if(AABBIntersect(pdle.x, pdle.y, pdle.width, pdle.height, this.x, this.y, this.side, this.side)){
this.x = pdle===player ? player.x+player.width : ai.x - this.side;
var n = (this.y + this.side - pdle.y)/(pdle.height+this.side);
var phi = 0.25*pi*(2*n - 1);
var smash = Math.abs(phi) > 0.2*pi ? 1.5 : 1;
this.vel.x = smash*(pdle === player ? 1 : -1)*this.speed*Math.cos(phi);
this.vel.y = smash*this.speed*Math.sin(phi);
}
if(0 > this.x+this.side || this.x > WIDTH){
this.serve(pdle === player ? 1 : -1);
}
},
draw: function(){
ctx.fillRect(this.x, this.y, this.side, this.side);
}
};
function main(){
canvas = document.createElement("canvas");
canvas.width = WIDTH;
canvas.height = HEIGHT;
ctx = canvas.getContext("2d");
document.body.appendChild(canvas);
keystate = {};
document.addEventListener("keydown", function(evt) {
keystate[evt.keyCode] = true;
});
document.addEventListener("keyup", function(evt) {
delete keystate[evt.keyCode];
});
init();
var loop = function(){
update();
draw();
window.requestAnimationFrame(loop, canvas);
};
window.requestAnimationFrame(loop, canvas);
}
function init(){
player.x = player.width;
player.y = (HEIGHT - player.height)/2;
ai.x = WIDTH - (player.width + ai.width);
ai.y = (HEIGHT - ai.height)/2;
ball.serve(1);
}
function update(){
ball.update();
player.update();
ai.update();
}
function draw(){
ctx.fillRect(0, 0, WIDTH, HEIGHT);
ctx.save();
ctx.fillStyle = "#fff";
ball.draw();
player.draw();
ai.draw();
var w = 4;
var x = (WIDTH - w) * 0.5;
var y = 0;
var step = HEIGHT/15;
while (y < HEIGHT){
ctx.fillRect(x, y + step * 0.25, w, step * 0.5);
y += step;
}
ctx.restore();
}
main();
}
</script>
end of pong code
</center>
</body>
</html>
I merely took @Xufox's solutions and wrote them out. Also serperated the JS, CSS, and HTML. Enjoy
function go(){
score = {
x: null,
y: null,
count: 0,
width: 10,
height: 10,
update: function(){
console.log(this.count);
},
draw: function(){
ctx.fillRect(this.x, this.y, this.width, this.height);
}
};
var WIDTH = 700, HEIGHT = 600, pi = Math.PI;
var UpArrow = 38, DownArrow = 40;
var canvas, ctx, keystate;
var player, ai, ball, score;
player = {
x: null,
y: null,
width: 20,
height: 100,
update: function(){
if(keystate[UpArrow]) this.y -= 7;
if(keystate[DownArrow]) this.y += 7;
},
draw: function(){
ctx.fillRect(this.x, this.y, this.width, this.height);
}
};
ai = {
x: null,
y: null,
width: 20,
height: 100,
update: function(){
var desty = ball.y - (this.height - ball.side)*0.5;
this.y += (desty - this.y) * 0.1;
},
draw: function(){
ctx.fillRect(this.x, this.y, this.width, this.height);
}
};
ball = {
x: null,
y: null,
vel: null,
side: 20,
speed: 9,
serve: function(side){
var r = Math.random();
this.x = side===1 ? player.x : ai.x - this.side;
this.y = (HEIGHT - this.side)*r;
score.count += 1;
var phi = 0.1*pi*(1 - 2*r);
this.vel = {
x: side*this.speed*Math.cos(phi),
y: this.speed*Math.sin(phi)
};
},
update: function(){
this.x += this.vel.x;
this.y += this.vel.y;
if(0 > this.y || this.y+this.side > HEIGHT){
var offset = this.vel.y < 0 ? 0 - this.y : HEIGHT - (this.y+this.side);
this.y += 2*offset;
this.vel.y *= -1;
}
var AABBIntersect = function(ax, ay, aw, ah, bx, by, bw, bh){
return ax < bx+bw && ay < by+bh && bx < ax+aw && by < ay+ah;
};
var pdle = this.vel.x < 0 ? player : ai;
if(AABBIntersect(pdle.x, pdle.y, pdle.width, pdle.height, this.x, this.y, this.side, this.side)){
this.x = pdle===player ? player.x+player.width : ai.x - this.side;
var n = (this.y + this.side - pdle.y)/(pdle.height+this.side);
var phi = 0.25*pi*(2*n - 1);
var smash = Math.abs(phi) > 0.2*pi ? 1.5 : 1;
this.vel.x = smash*(pdle === player ? 1 : -1)*this.speed*Math.cos(phi);
this.vel.y = smash*this.speed*Math.sin(phi);
}
if(0 > this.x+this.side || this.x > WIDTH){
this.serve(pdle === player ? 1 : -1);
}
},
draw: function(){
ctx.fillRect(this.x, this.y, this.side, this.side);
}
};
function main(){
canvas = document.createElement("canvas");
canvas.width = WIDTH;
canvas.height = HEIGHT;
ctx = canvas.getContext("2d");
document.body.appendChild(canvas);
keystate = {};
document.addEventListener("keydown", function(evt) {
keystate[evt.keyCode] = true;
});
document.addEventListener("keyup", function(evt) {
delete keystate[evt.keyCode];
});
init();
var loop = function(){
update();
draw();
window.requestAnimationFrame(loop, canvas);
};
window.requestAnimationFrame(loop, canvas);
}
function init(){
player.x = player.width;
player.y = (HEIGHT - player.height)/2;
ai.x = WIDTH - (player.width + ai.width);
ai.y = (HEIGHT - ai.height)/2;
ball.serve(1);
}
function update(){
ball.update();
player.update();
ai.update();
}
function draw(){
ctx.fillRect(0, 0, WIDTH, HEIGHT);
ctx.save();
ctx.fillStyle = "#fff";
ball.draw();
player.draw();
ai.draw();
var w = 4;
var x = (WIDTH - w) * 0.5;
var y = 0;
var step = HEIGHT/15;
while (y < HEIGHT){
ctx.fillRect(x, y + step * 0.25, w, step * 0.5);
y += step;
}
ctx.restore();
}
main();
} canvas {
position: absolute;
margin: auto;
top: 0;
bottom: 0;
left: 0;
right: 0;
}<!DOCTYPE html>
<html lang = "en">
<head>
<title>Title</title>
<meta charset="UTF-8">
</head>
<body>
<center>
<h1>Games</h1>
<input id="Pong" type="button" value="Pong" onclick="go();" />
</center>
<script type="text/javascript" src="javascript.js"></script>
</body>
</html>