bombs!

components/body.js

@@ -5,6 +5,7 @@ module.exports = createBody
 
 function createBody(body, fixture) {
  return bs.component('body')
+ .needs('attached')
  .needs('physical')
  .on('init', function() {
  this.body = this.world.CreateBody(body.call(this, this.world))

components/enemy.js

@@ -17,7 +17,7 @@ module.exports = function(
  return bs.define()
  .use(require('../components/attached'))
  .use(require('../components/physical'))
- .use(require('../components/health')(10))
+ .use(require('../components/health')(5))
  .use(bs.component()
  .on('init', function() {
  this.base_r =

components/explosive.js

@@ -0,0 +1,58 @@
+var bs = require('bindlestiff')
+
+module.exports = explosive
+
+function explosive(force) {
+ var Bullet = require('../entities/player-bullet')
+ var Box2D = require('box2dweb-commonjs').Box2D
+ var b2Vec2 = Box2D.Common.Math.b2Vec2
+ var tau = Math.PI * 2
+
+ return bs.component('explosive')
+ .needs('attached')
+ .needs('physical')
+ .needs('body')
+ .on('explode', function() {
+ if (this.flagged) return
+ this.flagged = true
+
+ var bodies = this.game.find('body')
+ var tx = this.body.m_xf.position.x
+ var ty = this.body.m_xf.position.y
+ var center = this.body.m_sweep.c
+ var tempVec = {x:0,y:0}
+
+ for (var i = 0; i < bodies.length; i += 1) {
+ var b = bodies[i]
+ if (b !== this.game.player.body) {
+ var p = b.body.m_xf.position
+ var dy = p.y - ty
+ var dx = p.x - tx
+ if (Math.abs(dy) + Math.abs(dx) < 30) {
+ var a = Math.atan2(dy, dx)
+ tempVec.x = Math.cos(a) * 40
+ tempVec.y = Math.sin(a) * 40
+ b.body.ApplyImpulse(tempVec, center)
+ b.trigger('damaged', 3)
+ }
+ }
+ }
+
+ this.game.next(function() {
+ for (var i = 0; i < 1; i += 0.05) {
+ var bullet = new Bullet
+ var dx = Math.cos(i * tau)
+ var dy = Math.sin(i * tau)
+ bullet.body.SetPosition(new b2Vec2(
+ tx + dx * 0.5
+ , ty + dy * 0.5
+ ))
+ bullet.body.ApplyImpulse({
+ x: dx * 50
+ , y: dy * 50
+ }, center)
+ this.add(bullet)
+ }
+ })
+ })
+}

entities/bomb.js

@@ -0,0 +1,47 @@
+var Box2D = require('box2dweb-commonjs').Box2D
+var b2e = require('box2d-events')
+var bs = require('bindlestiff')
+
+var b2CircleShape = Box2D.Collision.Shapes.b2CircleShape
+var b2FixtureDef = Box2D.Dynamics.b2FixtureDef
+var b2BodyDef = Box2D.Dynamics.b2BodyDef
+var b2Vec2 = Box2D.Common.Math.b2Vec2
+var b2Body = Box2D.Dynamics.b2Body
+
+module.exports = bs.define()
+ .use(require('../components/attached'))
+ .use(require('../components/physical'))
+ .use(require('../components/body')(
+ function createBody() {
+ var bd = new b2BodyDef
+ bd.position = new b2Vec2(Math.random()*5, Math.random()*5-5)
+ bd.type = b2Body.b2_dynamicBody
+ bd.userData = {}
+ bd.fixedRotation = false
+ bd.m_linearDamping = 1
+ return bd
+ },
+ function createFixture() {
+ var fd = new b2FixtureDef
+ fd.restitution = 0.5
+ fd.shape = new b2CircleShape(0.5)
+ return fd
+ }
+ ))
+ .use(require('../components/explosive')(100))
+ .use(bs.component()
+ .on('init', function() {
+ var self = this
+ this.c = '#362F34'
+ this.r = 15
+
+ b2e(Box2D, this.world).fixture(
+ this.fixture
+ ).on('begin', function(a, b) {
+ if (a.m_body === self.game.player.body)
+ self.trigger('explode')
+ })
+ })
+ )
+ .use(require('../components/draw-circle')())
+

entities/player-bullet.js

@@ -31,7 +31,13 @@ module.exports = bs.define()
  .use(bs.component()
  .on('init', function() {
  this.c = '#362F34'
- }))
+ this.t = 60 * 2
+ })
+ .on('tick', function() {
+ this.t -= 1
+ if (!this.t) this.flagged = true
+ })
+ )
  .use(require('../components/draw-circle')(5))
  .use(require('../components/harmful')(1, 1))
  .use(require('../components/gravity'))

entities/player.js

@@ -156,5 +156,6 @@ module.exports.prototype.fireBullet = function() {
  x: rx * 35 + this.body.m_linearVelocity.x
  , y: ry * 35 + this.body.m_linearVelocity.y
  }, bullet.body.GetWorldCenter())
+
  this.game.enqueue(bullet)
 }

game.js

@@ -18,6 +18,7 @@ function Game(canvas) {
  Manager.call(this)
 
  this.queue = []
+ this.ticks = []
 
  this.canvas = canvas
  this.ctx = canvas.getContext('2d')
@@ -51,6 +52,10 @@ Game.prototype.start = function() {
 
 var framecounter = fps({ every: 1, decay: 0.5 })
 Game.prototype.tick = function() {
+ for (var i = 0; i < this.ticks.length; i += 1)
+ this.ticks[i].call(this)
+ this.ticks.length = 0
+
  framecounter.tick()
  this.world.Step(this.tickrate, 8, 3)
  this.camera.tick()
@@ -103,3 +108,7 @@ Game.prototype.draw = function() {
 Game.prototype.enqueue = function(entity) {
  this.queue.push(entity)
 }
+
+Game.prototype.next = function(tick) {
+ this.ticks.push(tick)
+}

lib/spawner.js

@@ -3,9 +3,11 @@ module.exports = Spawner
 function Spawner(game) {
  if (!(this instanceof Spawner)) return new Spawner(game)
 
+ var bombChance = 1
  var frequency = 5
  var speed = 0.25
 
+ var Bomb = require('../entities/bomb').tag('spawned')
  var EnemyGenerator = require('../components/enemy')
  var b2Vec2 = require('box2dweb-commonjs').Box2D.Common.Math.b2Vec2
 
@@ -22,6 +24,16 @@ function Spawner(game) {
  enemy.body.SetPosition(new b2Vec2(x + ex, y + ey))
  }
  }
+
+ if (Math.random() < bombChance) {
+ var ex = Math.random() * 30
+ var ey = Math.random() * 30
+ if (chunk.get(ex|0, ey|0)) {
+ var b = new Bomb
+ game.add(b)
+ b.body.SetPosition(new b2Vec2(x + ex, y + ey))
+ }
+ }
  })
 
  game.field.grid.on('removed', function(chunk) {