paper
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The Swiss Army Knife of Vector Graphics Scripting
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HTML
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<title>Paperoids</title>
<script type="text/javascript" src="../../dist/paper-full.js"></script>
<script type="text/paperscript" canvas="canvas">
//
//
// Paperoids - an Asteroids clone for paper.js
//
// Sorry nerds, no enemy ships or sound just yet.
//
// Version: 1.2.1
// Author: David Hirmes (@hirmes)
// Date: 2011-08-09
//
// Revision History:
// 1.0 - 2011-07-13 - Initial release
// 1.1 - 2011-07-13 - Optimizations by Jonathan Puckey (@jonathanpuckey)
// 1.2 - 2011-07-16 - Refactored with closures (@jonathanpuckey)
// 1.2.1- 2011-08-09 - bug fixes
//
var presets = {
speed: 0.2,
maxRockSpeed: 4.5,
rockCount: 6,
lives: 3,
freeShipScore: 10000,
freeShipIncrement: 10000
};
function initialize() {
Rocks.add(presets.rockCount);
Score.update();
Lives.initialize();
}
function onKeyUp(event) {
if (event.key == 'space') {
Ship.moveTo(Point.random() * view.size);
Ship.stop();
}
if (event.key == 'z') {
Ship.fire();
}
// Show stats:
if (event.key == 'f') {
var stats = document.getElementById('stats');
if (stats) {
stats.style.display = (stats.style.display == 'block')
? 'none' : 'block';
}
}
}
function onFrame() {
Bullets.move();
Rocks.iterateExplosions();
Ship.checkCollisions();
if (Key.isDown('left')) {
Ship.turnLeft();
}
if (Key.isDown('right')) {
Ship.turnRight();
}
if (Key.isDown('up')) {
Ship.thrust();
} else {
Ship.coast();
}
Ship.move();
}
project.currentStyle.strokeColor = 'white';
var Game = {
roundDelay: false,
over: function() {
document.getElementById('gameover').style.display = 'block';
},
newRound: function() {
Game.roundDelay = false;
Rocks.add(presets.rockCount);
},
// Stats.js by Mr. Doob - https://github.com/mrdoob/stats.js
};
var assets = {
destroyedShip: new function() {
var group = new Group(
new Path([-10, -8], [10, 0]),
new Path([10, 0], [-10, 8]),
new Path([-8, 4], [-8, -4])
);
group.visible = false;
return group;
},
explosion: new function() {
var explosionPath = new Path.Circle(new Point(), 1);
explosionPath.fillColor = 'white';
explosionPath.strokeColor = null;
return new SymbolDefinition(explosionPath);
}
};
var Ship = new function() {
var path = new Path([-10, -8], [10, 0], [-10, 8], [-8, 4], [-8, -4]);
path.closed = true;
var thrust = new Path([-8, -4], [-14, 0], [-8, 4]);
var group = new Group(path, thrust);
group.position = view.bounds.center;
return {
item: group,
angle: 0,
vector: new Point({
angle: 0.2,
length: 1
}),
turnLeft: function() {
group.rotate(-3);
this.angle -= 3;
},
turnRight: function() {
group.rotate(3);
this.angle += 3;
},
thrust: function() {
thrust.visible = true;
this.vector += new Point({
angle: this.angle,
length: presets.speed
});
if (this.vector.length > 8) {
this.vector.length = 8;
}
},
stop: function() {
this.vector.length = 0;
},
fire: function() {
if (!this.dying)
Bullets.fire(this.item.position, this.angle);
},
coast: function() {
thrust.visible = false;
this.vector *= .992;
},
move: function() {
group.position += this.vector;
keepInView(group);
},
moveTo: function(position) {
group.position = position;
keepInView(group);
},
destroy: function() {
this.destroyedShip = assets.destroyedShip.clone();
this.destroyedShip.position = this.item.position;
this.destroyedShip.visible = true;
this.item.visible = false;
this.stop();
this.item.position = view.center;
this.dying = true;
},
destroyed: function() {
this.item.visible = true;
this.stop();
this.item.position = view.center;
this.dying = false;
this.destroyedShip.visible = false;
},
checkCollisions: function() {
var crashRock;
// move rocks and do a hit-test
// between bounding rect of rocks and ship
for (var i = 0; i < Rocks.children.length; i++) {
var rock = Rocks.children[i];
rock.position += rock.vector;
if (rock.bounds.intersects(this.item.bounds))
crashRock = rock;
keepInView(rock);
}
if (this.dying) {
var children = this.destroyedShip.children;
children[0].position.x++;
children[1].position.x--;
children[2].position.x--;
children[2].position.y++;
children[0].rotate(1);
children[1].rotate(-1);
children[2].rotate(1);
this.destroyedShip.opacity *= 0.98;
// don't update anything else if the ship is already dead.
return;
}
// if bounding rect collision, do a line intersection test
if (crashRock) {
var tempRock = crashRock.symbol.definition.clone();
tempRock.transform(crashRock.matrix);
tempRock.remove();
var intersections = this.item.firstChild.getIntersections(tempRock);
if (intersections.length > 0)
Lives.remove();
}
}
};
};
var Bullets = new function() {
var group = new Group();
var children = group.children;
function checkHits(bullet) {
for (var r = 0; r < Rocks.children.length; r++) {
var rock = Rocks.children[r];
if (rock.bounds.contains(bullet.position) ) {
Score.update(rock.shapeType);
Rocks.explode(rock);
if (rock.shapeType < Rocks.TYPE_SMALL ) {
for (var j = 0; j < 2; j++) {
Rocks.add(1, rock.shapeType + 4, rock.position);
}
}
rock.remove();
bullet.remove();
}
}
}
return {
fire: function(position, angle) {
// We can only fire 5 bullets at a time:
if (children.length == 5)
return;
var vector = new Point({
angle: angle,
length: 10
});
var bullet = new Path.Circle({
center: position + vector,
radius: 0.5,
parent: group,
fillColor: 'white',
strokeWidth: 'white',
strokeWidth: 0,
data: {
vector: vector,
timeToDie: 58
}
});
},
move: function() {
for (var i = 0; i < children.length; i++) {
var bullet = children[i];
bullet.data.timeToDie--;
if (bullet.data.timeToDie < 1) {
bullet.remove();
} else {
bullet.position += bullet.data.vector;
checkHits(bullet);
keepInView(bullet);
}
}
}
};
};
var Rocks = new function() {
var group = new Group();
var shapes = [
new Path(
[-23, -40.5], [0, -30.5], [24, -40.5], [45, -21.5], [25, -12.5],
[46, 9.5], [22, 38.5], [-10, 30.5], [-22, 40.5], [-46, 18.5],
[-33, 0.5], [-44, -21.5], [-23, -40.5]),
new Path(
[-45, -9.5], [-12, -40.5], [24, -40.5], [46, -11.5], [45, 10.5],
[24, 40.5], [0, 40.5], [0, 10.5], [-23, 38.5], [-46, 9.5], [-25, 0.5],
[-45, -9.5]),
new Path([-21.5, -39.5], [11.5, -39.5], [45.5, -20.5],
[45.5, -8.5], [9.5, 0.5], [44.5, 21.5], [22.5, 39.5], [9.5, 31.5],
[-20.5, 39.5], [-45.5, 10.5], [-45.5, -20.5], [-11.5, -21.5],
[-21.5, -39.5]),
new Path(
[-22.5, -40.5], [-0.5, -19.5], [23.5, -39.5], [44.5, -21.5],
[33.5, 0.5], [46.5, 19.5], [13.5, 40.5], [-22.5, 39.5], [-46.5, 18.5],
[-46.5, -18.5], [-22.5, -40.5])
];
// medium rocks
for (var i = 4; i < 8; i++) {
shapes[i] = shapes[i - 4].clone();
shapes[i].scale(0.5);
}
// small rocks
for (var i = 8; i < 12; i++) {
shapes[i] = shapes[i - 4].clone();
shapes[i].scale(0.4);
}
var rockSymbols = [];
for (var i = 0; i < shapes.length; i++) {
rockSymbols[i] = new SymbolDefinition(shapes[i]);
}
var explosions = new Group();
return {
shapes: shapes,
children: group.children,
make: function(type, pos) {
var randomRock = type + Math.floor(4 * Math.random());
var rock = rockSymbols[randomRock].place();
rock.position = pos ? pos : Point.random() * view.size;
rock.vector = new Point({
angle: 360 * Math.random(),
length: presets.maxRockSpeed * Math.random() + 0.1
});
rock.shapeType = type;
return rock;
},
add: function(amount, type, position) {
for (var i = 0; i < amount; i++) {
var rock = this.make(type || this.TYPE_BIG, position);
group.addChild(rock);
}
},
explode: function(rock) {
var boomRock = rock.symbol.definition.clone();
boomRock.position = rock.position;
for (var i = 0; i < boomRock.segments.length; i++) {
var segmentPoint = boomRock.segments[i].point;
var placed = assets.explosion.place(segmentPoint);
placed.vector = (placed.position - rock.position) * 0.1;
explosions.addChild(placed);
}
boomRock.remove();
},
iterateExplosions: function() {
for (var i = 0; i < explosions.children.length; i++) {
var explosion = explosions.children[i];
explosion.vector.length *= .7;
explosion.position += explosion.vector;
explosion.opacity = explosion.vector.length;
if (explosion.vector.length < 0.05 ) {
explosion.remove();
// if no more rocks, wait a second and start a new round
if (this.children.length < 1 && !Game.roundDelay) {
Game.roundDelay = true;
presets.rockCount += 2;
setTimeout(Game.newRound, 1000);
}
}
}
},
TYPE_BIG: 0,
TYPE_MEDIUM: 4,
TYPE_SMALL: 8
};
};
var Score = new function() {
var numberGroup = new Group(
new Path([0, 0], [20, 0], [20, 27], [0, 27], [0, 0]),
new Path([10, 0], [10, 27]),
new Path([0, 0], [20, 0], [20, 14], [0, 14], [0, 27], [20, 27]),
new Path([0, 0], [20, 0], [20, 14], [0, 14], [20, 14], [20, 27], [0, 27]),
new Path([0, 0], [0, 14], [20, 14], [20, 0], [20, 27]),
new Path([20, 0], [0, 0], [0, 14], [20, 14], [20, 27], [0, 27]),
new Path([20, 0], [0, 0], [0, 27], [20, 27], [20, 14], [0, 14]),
new Path([0, 0], [20, 0], [0, 27]),
new Path([0, 0], [20, 0], [20, 27], [0, 27], [0, 0], [0, 14], [20, 14]),
new Path([20, 14], [0, 14], [0, 0], [20, 0], [20, 27])
);
numberGroup.visible = false;
var scoreDisplay = new Group();
var score = 0;
return {
update: function(type) {
if (type == Rocks.TYPE_BIG) score += 20;
if (type == Rocks.TYPE_MEDIUM) score += 50;
if (type == Rocks.TYPE_SMALL) score += 100;
if (score >= presets.freeShipScore) {
Lives.add(1);
presets.freeShipScore += presets.freeShipIncrement;
}
scoreDisplay.removeChildren();
var scoreString = score + '';
for (var i = 0; i < scoreString.length; i++) {
var n = parseInt(scoreString[i], 10);
scoreDisplay.addChild(numberGroup.children[n].clone());
scoreDisplay.lastChild.position = [22 + i * 24, 22];
}
}
};
};
var Lives = new function() {
var currentLives;
var shipPath = Ship.item.firstChild.clone();
project.activeLayer.addChild(shipPath);
shipPath.visible = false;
Ship.visible = false;
var group = new Group();
return {
initialize: function() {
currentLives = presets.lives;
this.display();
},
add: function() {
currentLives++;
this.display();
},
remove: function() {
currentLives--;
this.display();
Ship.destroy();
setTimeout(function() {
if (currentLives == 0) {
Game.over();
} else {
Ship.destroyed();
}
}, 1200);
},
display: function() {
group.removeChildren();
for (var i = 0;i < currentLives - 1; i++) {
var copy = shipPath.clone();
copy.rotate(-90);
copy.visible = true;
group.addChild(copy);
copy.position = [22+ i * copy.bounds.width, 53];
}
}
};
};
initialize();
// Stop left and right keyboard events from propagating.
function onKeyDown(event) {
if (event.key == 'left' || event.key == 'right') {
return false;
}
}
function keepInView(item) {
var position = item.position;
var itemBounds = item.bounds;
var bounds = view.bounds;
if (itemBounds.left > bounds.width) {
position.x = -item.bounds.width;
}
if (position.x < -itemBounds.width) {
position.x = bounds.width;
}
if (itemBounds.top > view.size.height) {
position.y = -itemBounds.height;
}
if (position.y < -itemBounds.height) {
position.y = bounds.height + itemBounds.height / 2;
}
}
</script>
<style type="text/css">
html,
body {
margin: 0;
overflow: hidden;
height: 100%;
}
canvas {
width: 100%;
height: 100%;
}
body {
background: #000;
font-family:Helvetica,Arial;
}
.footer {
position:absolute;
bottom:0;
color:#ff0000;
background-color: rgba(60,60,60,0.8);
font-size:0.75em;
padding:0.5em;
color:#ddd;
width: 100%
}
.footer a {
color: #fff;
font-weight:
bold; text-decoration: none;
border-bottom: 1px solid #555;
}
.footer b {
background-color: #660000;
padding-left: 0.25em;
padding-right: 0.25em;
}
.gameover {
display: none;
position: absolute;
left: 40%;
top: 40%;
color: #fff;
background-color: rgba(60,60,60,0.8);
padding: 32px;
-moz-border-radius: 12px;
-webkit-border-radius: 12px;
border-radius: 12px;
-moz-background-clip: padding;
-webkit-background-clip: padding-box;
background-clip: padding-box;
}
.gameover a {
color: #fff;
font-weight: bold;
}
#stats {
position: absolute;
left: auto ;
right: 0px;
}
</style>
</head>
<body>
<canvas id="canvas" resize stats></canvas>
<div id="footer" class="footer"><a href=#">Paperoids</a>. To Play: <b>←</b> and <b>→</b> to rotate. <b>↑</b> for thrust. <b>Z</b> to fire. <b>F</b> to show FPS. Follow @<a href="http://twitter.com/#/hirmes">hirmes</a> for updates. Made with the amazing <a href="http://paperjs.org">Paper.js</a></div>
<div id="gameover" class="gameover">Game Over. <a href="Paperoids.html">Play again</a>?</div>
</body>
</html>