(() => {
// plugins
Matter.use(MatterAttractors);
// constants
const PATHS = {
DOME: '0 0 0 250 19 250 20 231.9 25.7 196.1 36.9 161.7 53.3 129.5 74.6 100.2 100.2 74.6 129.5 53.3 161.7 36.9 196.1 25.7 231.9 20 268.1 20 303.9 25.7 338.3 36.9 370.5 53.3 399.8 74.6 425.4 100.2 446.7 129.5 463.1 161.7 474.3 196.1 480 231.9 480 250 500 250 500 0 0 0',
DROP_LEFT: '0 0 20 0 70 100 20 150 0 150 0 0',
DROP_RIGHT: '50 0 68 0 68 150 50 150 0 100 50 0',
APRON_LEFT: '0 0 180 120 0 120 0 0',
APRON_RIGHT: '180 0 180 120 0 120 180 0'
};
const COLOR = {
BACKGROUND: '#212529',
OUTER: '#495057',
INNER: '#15aabf',
BUMPER: '#fab005',
BUMPER_LIT: '#fff3bf',
PADDLE: '#e64980',
PINBALL: '#dee2e6'
};
const GRAVITY = 0.75;
const WIREFRAMES = false;
const BUMPER_BOUNCE = 1.5;
const PADDLE_PULL = 0.002;
const MAX_VELOCITY = 50;
// score elements
let $currentScore = $('.current-score span');
let $highScore = $('.high-score span');
// shared variables
let currentScore, highScore;
let engine, world, render, pinball, stopperGroup;
let leftPaddle, leftUpStopper, leftDownStopper, isLeftPaddleUp;
let rightPaddle, rightUpStopper, rightDownStopper, isRightPaddleUp;
function load() {
init();
createStaticBodies();
createPaddles();
createPinball();
createEvents();
}
function init() {
// engine (shared)
engine = Matter.Engine.create();
// world (shared)
world = engine.world;
world.bounds = {
min: { x: 0, y: 0},
max: { x: 500, y: 800 }
};
world.gravity.y = GRAVITY; // simulate rolling on a slanted table
// render (shared)
render = Matter.Render.create({
element: $('.container')[0],
engine: engine,
options: {
width: world.bounds.max.x,
height: world.bounds.max.y,
wireframes: WIREFRAMES,
background: COLOR.BACKGROUND
}
});
Matter.Render.run(render);
// runner
let runner = Matter.Runner.create();
Matter.Runner.run(runner, engine);
// used for collision filtering on various bodies
stopperGroup = Matter.Body.nextGroup(true);
// starting values
currentScore = 0;
highScore = 0;
isLeftPaddleUp = false;
isRightPaddleUp = false;
}
function createStaticBodies() {
Matter.World.add(world, [
// table boundaries (top, bottom, left, right)
boundary(250, -30, 500, 100),
boundary(250, 830, 500, 100),
boundary(-30, 400, 100, 800),
boundary(530, 400, 100, 800),
// dome
path(239, 86, PATHS.DOME),
// pegs (left, mid, right)
wall(140, 140, 20, 40, COLOR.INNER),
wall(225, 140, 20, 40, COLOR.INNER),
wall(310, 140, 20, 40, COLOR.INNER),
// top bumpers (left, mid, right)
bumper(105, 250),
bumper(225, 250),
bumper(345, 250),
// bottom bumpers (left, right)
bumper(165, 340),
bumper(285, 340),
// shooter lane wall
wall(440, 520, 20, 560, COLOR.OUTER),
// drops (left, right)
path(25, 360, PATHS.DROP_LEFT),
path(425, 360, PATHS.DROP_RIGHT),
// slingshots (left, right)
wall(120, 510, 20, 120, COLOR.INNER),
wall(330, 510, 20, 120, COLOR.INNER),
// out lane walls (left, right)
wall(60, 529, 20, 160, COLOR.INNER),
wall(390, 529, 20, 160, COLOR.INNER),
// flipper walls (left, right);
wall(93, 624, 20, 98, COLOR.INNER, -0.96),
wall(357, 624, 20, 98, COLOR.INNER, 0.96),
// aprons (left, right)
path(79, 740, PATHS.APRON_LEFT),
path(371, 740, PATHS.APRON_RIGHT),
// reset zones (center, right)
reset(225, 50),
reset(465, 30)
]);
}
function createPaddles() {
// these bodies keep paddle swings contained, but allow the ball to pass through
leftUpStopper = stopper(160, 591, 'left', 'up');
leftDownStopper = stopper(140, 743, 'left', 'down');
rightUpStopper = stopper(290, 591, 'right', 'up');
rightDownStopper = stopper(310, 743, 'right', 'down');
Matter.World.add(world, [leftUpStopper, leftDownStopper, rightUpStopper, rightDownStopper]);
// this group lets paddle pieces overlap each other
let paddleGroup = Matter.Body.nextGroup(true);
// Left paddle mechanism
let paddleLeft = {};
paddleLeft.paddle = Matter.Bodies.trapezoid(170, 660, 20, 80, 0.33, {
label: 'paddleLeft',
angle: 1.57,
chamfer: {},
render: {
fillStyle: COLOR.PADDLE
}
});
paddleLeft.brick = Matter.Bodies.rectangle(172, 672, 40, 80, {
angle: 1.62,
chamfer: {},
render: {
visible: false
}
});
paddleLeft.comp = Matter.Body.create({
label: 'paddleLeftComp',
parts: [paddleLeft.paddle, paddleLeft.brick]
});
paddleLeft.hinge = Matter.Bodies.circle(142, 660, 5, {
isStatic: true,
render: {
visible: false
}
});
Object.values(paddleLeft).forEach((piece) => {
piece.collisionFilter.group = paddleGroup
});
paddleLeft.con = Matter.Constraint.create({
bodyA: paddleLeft.comp,
pointA: { x: -29.5, y: -8.5 },
bodyB: paddleLeft.hinge,
length: 0,
stiffness: 0
});
Matter.World.add(world, [paddleLeft.comp, paddleLeft.hinge, paddleLeft.con]);
Matter.Body.rotate(paddleLeft.comp, 0.57, { x: 142, y: 660 });
// right paddle mechanism
let paddleRight = {};
paddleRight.paddle = Matter.Bodies.trapezoid(280, 660, 20, 80, 0.33, {
label: 'paddleRight',
angle: -1.57,
chamfer: {},
render: {
fillStyle: COLOR.PADDLE
}
});
paddleRight.brick = Matter.Bodies.rectangle(278, 672, 40, 80, {
angle: -1.62,
chamfer: {},
render: {
visible: false
}
});
paddleRight.comp = Matter.Body.create({
label: 'paddleRightComp',
parts: [paddleRight.paddle, paddleRight.brick]
});
paddleRight.hinge = Matter.Bodies.circle(308, 660, 5, {
isStatic: true,
render: {
visible: false
}
});
Object.values(paddleRight).forEach((piece) => {
piece.collisionFilter.group = paddleGroup
});
paddleRight.con = Matter.Constraint.create({
bodyA: paddleRight.comp,
pointA: { x: 29.5, y: -8.5 },
bodyB: paddleRight.hinge,
length: 0,
stiffness: 0
});
Matter.World.add(world, [paddleRight.comp, paddleRight.hinge, paddleRight.con]);
Matter.Body.rotate(paddleRight.comp, -0.57, { x: 308, y: 660 });
}
function createPinball() {
// x/y are set to when pinball is launched
pinball = Matter.Bodies.circle(0, 0, 14, {
label: 'pinball',
collisionFilter: {
group: stopperGroup
},
render: {
fillStyle: COLOR.PINBALL
}
});
Matter.World.add(world, pinball);
launchPinball();
}
function createEvents() {
// events for when the pinball hits stuff
Matter.Events.on(engine, 'collisionStart', function(event) {
let pairs = event.pairs;
pairs.forEach(function(pair) {
if (pair.bodyB.label === 'pinball') {
switch (pair.bodyA.label) {
case 'reset':
launchPinball();
break;
case 'bumper':
pingBumper(pair.bodyA);
break;
}
}
});
});
// regulate pinball
Matter.Events.on(engine, 'beforeUpdate', function(event) {
// bumpers can quickly multiply velocity, so keep that in check
Matter.Body.setVelocity(pinball, {
x: Math.max(Math.min(pinball.velocity.x, MAX_VELOCITY), -MAX_VELOCITY),
y: Math.max(Math.min(pinball.velocity.y, MAX_VELOCITY), -MAX_VELOCITY),
});
// cheap way to keep ball from going back down the shooter lane
if (pinball.position.x > 450 && pinball.velocity.y > 0) {
Matter.Body.setVelocity(pinball, { x: 0, y: -10 });
}
});
// mouse drag (god mode for grabbing pinball)
Matter.World.add(world, Matter.MouseConstraint.create(engine, {
mouse: Matter.Mouse.create(render.canvas),
constraint: {
stiffness: 0.2,
render: {
visible: false
}
}
}));
// keyboard paddle events
$('body').on('keydown', function(e) {
if (e.which === 37) { // left arrow key
isLeftPaddleUp = true;
} else if (e.which === 39) { // right arrow key
isRightPaddleUp = true;
}
});
$('body').on('keyup', function(e) {
if (e.which === 37) { // left arrow key
isLeftPaddleUp = false;
} else if (e.which === 39) { // right arrow key
isRightPaddleUp = false;
}
});
// click/tap paddle events
$('.left-trigger')
.on('mousedown touchstart', function(e) {
isLeftPaddleUp = true;
})
.on('mouseup touchend', function(e) {
isLeftPaddleUp = false;
});
$('.right-trigger')
.on('mousedown touchstart', function(e) {
isRightPaddleUp = true;
})
.on('mouseup touchend', function(e) {
isRightPaddleUp = false;
});
}
function launchPinball() {
updateScore(0);
Matter.Body.setPosition(pinball, { x: 465, y: 765 });
Matter.Body.setVelocity(pinball, { x: 0, y: -25 + rand(-2, 2) });
Matter.Body.setAngularVelocity(pinball, 0);
}
function pingBumper(bumper) {
updateScore(currentScore + 10);
// flash color
bumper.render.fillStyle = COLOR.BUMPER_LIT;
setTimeout(function() {
bumper.render.fillStyle = COLOR.BUMPER;
}, 100);
}
function updateScore(newCurrentScore) {
currentScore = newCurrentScore;
$currentScore.text(currentScore);
highScore = Math.max(currentScore, highScore);
$highScore.text(highScore);
}
// matter.js has a built in random range function, but it is deterministic
function rand(min, max) {
return Math.random() * (max - min) + min;
}
// outer edges of pinball table
function boundary(x, y, width, height) {
return Matter.Bodies.rectangle(x, y, width, height, {
isStatic: true,
render: {
fillStyle: COLOR.OUTER
}
});
}
// wall segments
function wall(x, y, width, height, color, angle = 0) {
return Matter.Bodies.rectangle(x, y, width, height, {
angle: angle,
isStatic: true,
chamfer: { radius: 10 },
render: {
fillStyle: color
}
});
}
// bodies created from SVG paths
function path(x, y, path) {
let vertices = Matter.Vertices.fromPath(path);
return Matter.Bodies.fromVertices(x, y, vertices, {
isStatic: true,
render: {
fillStyle: COLOR.OUTER,
// add stroke and line width to fill in slight gaps between fragments
strokeStyle: COLOR.OUTER,
lineWidth: 1
}
});
}
// round bodies that repel pinball
function bumper(x, y) {
let bumper = Matter.Bodies.circle(x, y, 25, {
label: 'bumper',
isStatic: true,
render: {
fillStyle: COLOR.BUMPER
}
});
// for some reason, restitution is reset unless it's set after body creation
bumper.restitution = BUMPER_BOUNCE;
return bumper;
}
// invisible bodies to constrict paddles
function stopper(x, y, side, position) {
// determine which paddle composite to interact with
let attracteeLabel = (side === 'left') ? 'paddleLeftComp' : 'paddleRightComp';
return Matter.Bodies.circle(x, y, 40, {
isStatic: true,
render: {
visible: false,
},
collisionFilter: {
group: stopperGroup
},
plugin: {
attractors: [
// stopper is always a, other body is b
function(a, b) {
if (b.label === attracteeLabel) {
let isPaddleUp = (side === 'left') ? isLeftPaddleUp : isRightPaddleUp;
let isPullingUp = (position === 'up' && isPaddleUp);
let isPullingDown = (position === 'down' && !isPaddleUp);
if (isPullingUp || isPullingDown) {
return {
x: (a.position.x - b.position.x) * PADDLE_PULL,
y: (a.position.y - b.position.y) * PADDLE_PULL,
};
}
}
}
]
}
});
}
// contact with these bodies causes pinball to be relaunched
function reset(x, width) {
return Matter.Bodies.rectangle(x, 781, width, 2, {
label: 'reset',
isStatic: true,
render: {
fillStyle: '#fff'
}
});
}
window.addEventListener('load', load, false);
})();
!
