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Midgard 2022-01-28 21:39:48 +01:00
commit c45f3fd3c8
Signed by: midgard
GPG key ID: 511C112F1331BBB4
5 changed files with 590 additions and 0 deletions

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Particles</title>
<style type="text/css" media="all">
html, body {
height: 100%;
margin: 0;
padding: 0;
}
body {
background: linear-gradient(#eeeeee, #e4e4e4);
color: #999;
text-align: center;
font-family: sans-serif;
cursor: default;
}
a {
color: inherit;
}
h1 {
margin-top: 0;
padding-top: 50px;
position: relative;
color: #777;
font-weight: normal;
}
h1:before {
content: 'Particles';
position: absolute;
top: 0;
left: 0;
right: 0;
color: #888;
height: 1.3ex;
padding-top: 50px;
overflow: hidden;
}
#gamecontainer {
position:relative;
width: 602px;
height: 602px;
margin: 0 auto;
}
#gamecontainer > * {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
#message, #playbutton {
padding-top: 50px;
margin: 0 auto;
text-transform: uppercase;
letter-spacing: 5px;
font-size: 150%;
}
#message div {
opacity: 0;
transition: opacity 1s;
margin-top: 40px;
line-height: 2;
}
#message div.visible {
opacity: 1;
}
#playbutton {
font-size: 200%;
color: #888;
cursor: pointer;
padding-top: 275px;
}
#playbutton:hover {
color: #222;
}
#background {
background: linear-gradient(#ffffff, #f4f4f4);
box-shadow: #f2f2f2 5px -5px 5px inset, #f2f2f2 -5px 5px 5px inset;
position: absolute;
border: 1px solid #ccc;
}
.gameon gamecontainer, .gameon canvas {
cursor: none;
}
</style>
</head>
<body>
<h1>Particles</h1>
<div id="gamecontainer">
<div id="background"></div>
<div id="message"></div>
<canvas id="game" width="600" height="600"></canvas>
<div id="playbutton">Play</div>
</div>
<footer>
<p>A reimplementation by Midgard of the <a href="https://www.newgrounds.com/portal/view/357700">Flash game</a> of yore by Matteo Guarnieri</p>
<p>Music: <a href="https://dimrain47.newgrounds.com/">Dimrain47</a> <a href="https://www.newgrounds.com/audio/listen/30208">Twilight Techno</a></p>
</footer>
<audio id="music" src="dimrain47_-_twilight_techno.mp3"></audio>
<script type="text/javascript" src="main.js"></script>
</body>
</html>

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(function() {
"use strict";
var canvas = document.getElementById("game");
if (!canvas.getContext) {
alert("Your browser is unsupported (does not support canvas.getContext).");
return;
}
var ctx = canvas.getContext("2d");
var playfieldWidth = canvas.width;
var playfieldHeight = canvas.height;
var BALL_RADIUS = 20;
var GRAVITY_ACCELERATION = 10;
function message(text, expire) {
document.getElementById("message").innerHTML = "";
var div = document.createElement("div");
div.innerText = text;
document.getElementById("message").appendChild(div);
div.className = "visible";
if (expire === false) { return; }
if (!expire) { expire = 2000; }
window.setTimeout(function() {
div.className = "";
window.setTimeout(function() {
try {
div.parentNode.removeChild(div);
} catch(e) {}
}, 1000);
}, expire);
}
function Vector(x, y) {
this.x = x;
this.y = y;
}
Vector.prototype.add = function(other) {
return new Vector(
this.x + other.x,
this.y + other.y
);
};
Vector.prototype.iadd = function(other) {
this.x += other.x;
this.y += other.y;
};
Vector.prototype.sub = function(other) {
return new Vector(
this.x - other.x,
this.y - other.y
);
};
Vector.prototype.mul = function(scalar) {
return new Vector(
this.x * scalar,
this.y * scalar
);
};
Vector.prototype.dot = function(other) {
return this.x * other.x + this.y * other.y;
};
Vector.prototype.normSquared = function() {
return this.dot(this);
};
Vector.prototype.norm = function() {
return Math.sqrt(this.normSquared(this));
};
Vector.prototype.distance_squared = function(other) {
var diffX = this.x - other.x;
var diffY = this.y - other.y;
return diffX * diffX + diffY * diffY;
};
Vector.prototype.toString = function() {
return "Vector(" + this.x + ", " + this.y + ")";
};
function Circle(centre, radius) {
this.centre = centre;
this.radius = radius;
}
Circle.prototype.intersects = function(other) {
return (
this.centre.distance_squared(other.centre)
<=
2 * this.radius * 2 * this.radius
);
}
Circle.prototype.toString = function(other) {
return "Circle(centre=" + this.centre.toString() + ", radius=" + this.radius + ")";
}
function Ball(outline, velocity, colour, ghost) {
this.outline = outline;
this.velocity = velocity;
this.colour = colour;
this.ghost = ghost;
this.audioBall = new Audio("ball.mp3");
this.audioEdge = new Audio("edge.mp3");
}
Ball.prototype.toString = function() {
return (
"Ball(outline=" + this.outline.toString() + "," +
"velocity=" + this.velocity.toString() + ", " +
"colour=" + this.colour + ", ghost=" + this.ghost + ")"
);
}
function intersectsExistingBall(circle) {
for (var i = 0; i < balls.length; i++) {
if (circle.intersects(balls[i].outline)) {
return true;
}
}
return false;
}
function bogoGenerateNewBallOutline() {
var circle;
do {
circle = new Circle(
new Vector(
Math.random() * (playfieldWidth - 2*BALL_RADIUS) + BALL_RADIUS,
Math.random() * (playfieldHeight - 2*BALL_RADIUS) + BALL_RADIUS
),
BALL_RADIUS
);
} while (intersectsExistingBall(circle));
return circle;
}
function bogoGenerateVelocity() {
var vec;
do {
vec = new Vector(
Math.random() * 10 - 2,
Math.random() * 10 - 2
);
} while (vec.normSquared < 2);
return vec;
}
var playerBall;
var balls = [];
function addBall(ghost) {
var newBall = new Ball(
bogoGenerateNewBallOutline(),
bogoGenerateVelocity(),
"red",
ghost
);
balls.push(newBall);
}
var isGameOver = true;
function advanceBall(ball, timePassed) {
if (ball.ghost != 0) {
ball.ghost -= timePassed / 1000;
if (ball.ghost <= 0) {
ball.ghost = 0;
}
if (!isGameOver) {
return;
}
}
ball.outline.centre.iadd(
ball.velocity.mul(timePassed / 20)
);
}
function bounceBalls(ball1, ball2) {
var x1 = ball1.outline.centre;
var x2 = ball2.outline.centre;
var v1 = ball1.velocity;
var v2 = ball2.velocity;
var x_diff1 = x1.sub(x2);
var x_diff2 = x2.sub(x1);
var collisionForce = v1.sub(v2).norm();
ball1.audioBall.pause();
ball1.audioBall.currentTime = 0;
ball1.audioBall.volume = clamp(collisionForce / 10 + 0.1, 0, 1);
ball1.audioBall.play();
// https://en.wikipedia.org/w/index.php?title=Elastic_collision&oldid=1057236793#Two-dimensional_collision_with_two_moving_objects
ball1.velocity = v1.sub(x_diff1.mul((v1.sub(v2).dot(x_diff1)) / x_diff1.normSquared()));
ball2.velocity = v2.sub(x_diff2.mul((v2.sub(v1).dot(x_diff2)) / x_diff2.normSquared()));
// Make balls non-intersecting
var c = x1.add(x2).mul(1/2)
ball1.outline.centre = c.add(x1.sub(c).mul((ball1.outline.radius + 0.05) / x1.sub(c).norm()));
ball2.outline.centre = c.add(x2.sub(c).mul((ball2.outline.radius + 0.05) / x2.sub(c).norm()));
}
function handleBounceEdge(ball, ignoreBottom) {
var bounce = false;
if (ball.outline.centre.x <= ball.outline.radius) {
ball.velocity.x *= -1;
ball.outline.centre.x = ball.outline.radius + (ball.outline.radius - ball.outline.centre.x);
bounce = true;
}
if (ball.outline.centre.y <= ball.outline.radius) {
ball.velocity.y *= -1;
ball.outline.centre.y = ball.outline.radius + (ball.outline.radius - ball.outline.centre.y);
bounce = true;
}
var maxX = playfieldWidth - ball.outline.radius;
var maxY = playfieldHeight - ball.outline.radius;
if (ball.outline.centre.x >= maxX) {
ball.velocity.x *= -1;
ball.outline.centre.x = maxX + (maxX - ball.outline.centre.x);
bounce = true;
}
if (ball.outline.centre.y >= maxY && !ignoreBottom) {
ball.velocity.y *= -1;
ball.outline.centre.y = maxY + (maxY - ball.outline.centre.y);
bounce = true;
}
if (bounce) {
ball.audioEdge.pause();
ball.audioEdge.currentTime = 0;
ball.audioEdge.volume = clamp(ball.velocity.norm() / 3 + 0.1, 0, 1);
ball.audioEdge.play();
}
}
function checkPlayerCollision() {
for (var i = 1; i < balls.length; i++) {
if (balls[i].ghost == 0 && playerBall.outline.intersects(balls[i].outline)) {
bounceBalls(playerBall, balls[i]);
gameOver();
return;
}
}
}
function checkBallCollision(includingPlayerBall) {
var start = includingPlayerBall ? 0 : 1;
for (var i = start; i < balls.length; i++)
for (var j = i + 1; j < balls.length; j++) {
if (
balls[i].outline.intersects(balls[j].outline) &&
(
(balls[i].ghost == 0 && balls[j].ghost == 0) ||
isGameOver
)
) {
bounceBalls(balls[i], balls[j]);
}
}
}
function gravity(ball, timePassed) {
ball.velocity.y += GRAVITY_ACCELERATION * timePassed / 1000;
}
function allFallen() {
for (var i = 0; i < balls.length; i++) {
if (balls[i].outline.centre.y < playfieldHeight + balls[i].outline.radius) {
return false;
}
}
return true;
}
var colorGradients = {
"blue": [
[0, "#2b2bff"],
[0.5, "#1212eb"],
[1, "#000092"]
],
"red": [
[0, "#ff2b2b"],
[0.5, "#eb1212"],
[1, "#920000"]
]
};
function drawBall(ball) {
var x = ball.outline.centre.x;
var y = ball.outline.centre.y;
var r = ball.outline.radius;
ctx.beginPath();
ctx.globalAlpha = 1 - ball.ghost;
ctx.arc(x, y, ball.outline.radius, 0, Math.PI * 2, true);
var gradient = ctx.createRadialGradient(x+r*.75,y-r*.75,0, x,y,r*1.1);
for (var i in colorGradients[ball.colour]) {
gradient.addColorStop(
colorGradients[ball.colour][i][0],
colorGradients[ball.colour][i][1]
);
}
ctx.fillStyle = gradient;
ctx.closePath();
ctx.fill();
}
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
for (var i = balls.length - 1; i >= 0; i--) {
drawBall(balls[i]);
}
}
var gameStarted = null;
var previousTime = -1;
function gameLoop(timestamp) {
if (previousTime == -1) {
previousTime = timestamp;
}
var timePassed = timestamp - previousTime;
checkPlayerCollision();
for (var i = 1; i < balls.length; i++) {
advanceBall(balls[i], timePassed);
handleBounceEdge(balls[i]);
}
checkBallCollision(false);
draw();
previousTime = timestamp;
if (!isGameOver) {
requestAnimationFrame(gameLoop);
} else {
requestAnimationFrame(gameOverLoop);
}
}
function gameOver() {
console.log("Game over");
var gameDuration = new Date() - gameStarted;
message(
"You reached " + (balls.length - 1) + " balls\n" +
"You lasted " + Math.floor(gameDuration / 1000) + " seconds",
false);
document.getElementById("playbutton").innerHTML = "Play again";
if (ballAddTimeout !== null) {
window.clearTimeout(ballAddTimeout);
}
isGameOver = true;
fadeOutMusic();
document.body.className = "gameover";
}
function fadeOutMusic() {
if (!isGameOver) return;
if (document.getElementById("music").volume > 0.01) {
document.getElementById("music").volume *= 0.8;
window.setTimeout(fadeOutMusic, 100);
} else {
document.getElementById("music").pause();
}
}
function gameOverLoop(timestamp) {
var timePassed = timestamp - previousTime;
for (var i = 0; i < balls.length; i++) {
gravity(balls[i], timePassed);
advanceBall(balls[i], timePassed);
handleBounceEdge(balls[i], true);
}
checkBallCollision(true);
draw();
previousTime = timestamp;
if (!allFallen(balls)) {
requestAnimationFrame(gameOverLoop);
} else {
prepareStartButton();
}
}
function clamp(value, min, max) {
return Math.max(min, Math.min(max, value));
}
function moveMouseCallback(event) {
if (isGameOver) return;
// move player
var previousPosition = playerBall.outline.centre;
var newPosition = new Vector(
clamp(event.clientX - document.getElementById("gamecontainer").offsetLeft, BALL_RADIUS, playfieldWidth - BALL_RADIUS),
clamp(event.clientY - document.getElementById("gamecontainer").offsetTop, BALL_RADIUS, playfieldHeight - BALL_RADIUS)
);
playerBall.outline.centre = newPosition;
playerBall.velocity = newPosition.sub(previousPosition).mul(0.1);
}
document.body.addEventListener("mousemove", moveMouseCallback);
document.body.addEventListener("mousein", moveMouseCallback);
var ballAddTimeout = null;
var ballAddMessages = [
["3 balls\nEasy peasy", 15],
["4 balls\nStill quite easy", 20],
["5 balls\nFun begins now", 30],
["6 balls\nQuite challenging", 35],
["7 balls\nPretty tough", 40],
["8 balls\nVery tricky", 50],
["9 balls\nTerribly hard", 60],
["10 balls\nIncredibly tough", 60],
["11 balls\nInsanely difficult", 60],
["12 balls\nAbsolutely crazy", 60],
["13 balls\nCompletely mad", 60],
["14 balls\nAlmost impossible", 60],
["15 balls\nMaxed out", 60]
];
function ballAddTimeoutFunction() {
if (balls.length - 2 > ballAddMessages.length) {
return;
}
addBall(1);
var addMessage = ballAddMessages[balls.length - 4];
message(addMessage[0]);
ballAddTimeout = window.setTimeout(ballAddTimeoutFunction, addMessage[1] * 1000);
}
function startGame() {
document.getElementById("music").currentTime = 0;
document.getElementById("music").volume = 0.5;
document.getElementById("music").play();
document.getElementById("playbutton").style.display = "none";
playerBall = new Ball(
new Circle(
new Vector(
canvas.width / 2 - BALL_RADIUS,
canvas.height / 2 - BALL_RADIUS
),
BALL_RADIUS
),
new Vector(0, 0),
"blue",
0
);
balls = [playerBall];
for (var i = 0; i < 2; i++) {
addBall(1);
}
console.log(`${balls.length} balls`);
ballAddTimeoutFunction();
isGameOver = false;
previousTime = -1;
requestAnimationFrame(gameLoop);
gameStarted = new Date();
document.body.className = "gameon";
}
function prepareStartButton() {
document.getElementById("playbutton").style.display = "block";
document.getElementById("playbutton").onclick = startGame;
}
prepareStartButton();
})();