From 6455bf5e98bfda0df0ddfe2ea8bf51463888efbf Mon Sep 17 00:00:00 2001
From: Jonathan Puckey <me@jonathanpuckey.com>
Date: Thu, 11 Aug 2011 20:24:04 +0200
Subject: [PATCH] Add Paperoids example.

---
 examples/Games/Paperoids.html | 525 ++++++++++++++++++++++++++++++++++
 1 file changed, 525 insertions(+)
 create mode 100644 examples/Games/Paperoids.html
diff --git a/examples/Games/Paperoids.html b/examples/Games/Paperoids.html
new file mode 100644
index 00000000..dccf13d4
--- /dev/null
+++ b/examples/Games/Paperoids.html
@@ -0,0 +1,525 @@
+<!DOCTYPE html>
+<html>
+<head>
+	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+	<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
+	<title>Paperoids</title>
+	<link rel="stylesheet" href="paperoids.css">
+	<script type="text/javascript" src="js/Stats.js"></script>
+	<script type="text/javascript" src="js/paper.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();
+		document.getElementById('statholder').style.display = 'block';
+	}
+
+	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 statHolder = document.getElementById('statholder');
+			statHolder.style.display = (statHolder.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();
+		Game.updateStats();
+	}
+
+	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
+		updateStats: new function() {
+			var stats = new Stats();
+
+			// Align top-left
+			stats.domElement.style.position = 'absolute';
+			stats.domElement.style.left = '0px';
+			stats.domElement.style.top = '0px';
+
+			document.getElementById('statholder').appendChild( stats.domElement );
+			document.getElementById('statholder').style.display = "none";
+			return stats.update;
+		}
+	};
+
+	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 Symbol(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 crash = -1;
+
+				// 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)) {
+						crash = i;
+					}
+					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 (crash > -1) {
+					var hit = false;
+					var pos = Rocks.children[crash].position;
+					var shipSegments = this.item.firstChild.segments;
+					var index = Rocks.children[crash].typeIndex;
+					var tempRock = Rocks.shapes[index].clone();
+					tempRock.transform(Rocks.children[crash].matrix);
+					tempRock.remove();
+					var rockSegments = tempRock.segments;
+					// This code should be able to be simplified alot very soon,
+					// when Paper.js implements Path#intersects(path);
+					for (var i = 0; i < rockSegments.length - 1; i++) {
+						var rockLine = new Line(rockSegments[i].point,
+								rockSegments[i + 1].point, false);
+						var shipLine = new Line(shipSegments[0].point,
+								shipSegments[1].point, false);
+						var lineHit = shipLine.intersect(rockLine);
+						if (lineHit) {
+							hit = true;
+							break;
+						}
+					}
+					if (hit) Lives.remove();
+				}
+			}
+		};
+	};
+
+	var Bullets = new function() {
+		var group = new Group();
+		var children = group.children;
+		return {
+			fire: function(position, angle) {
+				if (children.length > 4) return; 
+				var bullet = new Path.Circle(position, 0.5);
+				bullet.fillColor = 'white';
+				bullet.strokeWidth = 0;
+				bullet.data = {
+					vector: new Point({
+						angle: angle,
+						length: 10
+					}),
+					timeToDie: 58
+				};
+				bullet.position += bullet.data.vector;
+				group.addChild(bullet);
+			},
+			move: function() {
+				// check for bullet hit
+				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;
+						for (var r = 0; r < Rocks.children.length; r++) {
+							var rock = Rocks.children[r];
+							if (rock.bounds.contains(bullet.position) ) {
+								Score.update(rock.type);
+								Rocks.explode(rock);
+								if (rock.type < Rocks.TYPE_SMALL ) {
+									for (var i = 0; i < 2; i++) {
+										Rocks.add(1, rock.type + 4, rock.position);
+									}
+								}
+								rock.remove();
+								bullet.remove();
+							}
+						}
+						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 Symbol(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.typeIndex = randomRock;
+				rock.type = 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 = shapes[rock.typeIndex].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>
+</head>
+<body style="background:black">
+	<canvas style="position:absolute" id="canvas" resize></canvas>
+	
+	<div style="position:absolute;right:51px;color:#ff0000;" id="statholder">FPS</div>
+	
+	<div id="footer" class="footer"><a href=#">Paperoids</a>.  To Play: <b>&#8592;</b> and <b>&#8594;</b> to rotate.  <b>&#8593;</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="index.html">Play again</a>?</div>
+</body>
+</html>
