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space.js
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space.js
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PlanetImg = new Image();
PlanetImg.src = 'images/planet.png'
StarImg1 = new Image();
StarImg1.src = 'images/star1.png'
StarImg2 = new Image();
StarImg2.src = 'images/star2.png'
function Space(game){
// Singleton
if(Space.instance_){
return Space.instance_;
}
this.Game = game;
this.canvasCtx = null;
this.meteors = [];
this.stars = [];
this.previousMeteorX = 0;
this.framesPlayed = 0;
this.planetSize = 180;
this.star1Size = 24;
this.star2Size = 35;
this.instance_ = this;
this.init()
}
Space.prototype = {
init: function(){
this.canvasCtx = this.Game.canvasCtx
this.time = 0;
this.meteors = [];
this.stars = [];
this.previousMeteorX = 0;
this.framesPlayed = 0;
this.update();
},
update : function(frameCount){
if (!this.Game.gameOver) {
this.framesPlayed = frameCount;
}
if (this.framesPlayed > 500) {
this.canvasCtx.drawImage(StarImg1, 0, 0, this.star1Size, this.star1Size, 30, 40, this.star1Size * 0.8, this.star1Size * 0.8)
}
if (this.framesPlayed > 1000) {
this.canvasCtx.drawImage(StarImg1, 0, 0, this.star1Size, this.star1Size, 150, 20, this.star1Size * 0.8, this.star1Size * 0.8)
}
if (this.framesPlayed > 1500) {
this.canvasCtx.drawImage(StarImg1, 0, 0, this.star1Size, this.star1Size, 220, 70, this.star1Size * 0.8, this.star1Size * 0.8)
}
if (this.framesPlayed > 2000) {
this.canvasCtx.drawImage(StarImg1, 0, 0, this.star1Size, this.star1Size, 40, 200, this.star1Size * 0.8, this.star1Size * 0.8)
}
if (this.framesPlayed > 2500) {
this.canvasCtx.drawImage(StarImg1, 0, 0, this.star1Size, this.star1Size, 170, 180, this.star1Size * 0.8, this.star1Size * 0.8)
}
if (this.framesPlayed > 3000) {
this.canvasCtx.drawImage(StarImg2, 0, 0, this.star2Size, this.star2Size, 420, 40, this.star2Size * 0.75, this.star2Size * 0.75)
}
if (this.framesPlayed > 3500) {
this.canvasCtx.drawImage(StarImg2, 0, 0, this.star2Size, this.star2Size, 80, 100, this.star2Size * 0.75, this.star2Size * 0.75)
}
if (this.framesPlayed > 4000) {
this.canvasCtx.drawImage(StarImg2, 0, 0, this.star2Size, this.star2Size, 300, 200, this.star2Size * 0.75, this.star2Size * 0.75)
}
if (this.framesPlayedt > 4500) {
this.canvasCtx.drawImage(StarImg1, 0, 0, this.star1Size, this.star1Size, 400, 240, this.star1Size * 0.8, this.star1Size * 0.8)
}
if (this.framesPlayed > 5000) {
this.canvasCtx.drawImage(PlanetImg, 0, 0, this.planetSize, this.planetSize, 270, 40, this.planetSize, this.planetSize);
}
if (!this.Game.gameOver) {
if (this.shouldSpawnMeteor(frameCount)) {
this.spawnMeteor(frameCount);
}
if (this.shouldSpawnStar(frameCount)) {
this.spawnStar(frameCount);
}
}
this.meteors.forEach(function(meteor){
meteor.update(frameCount);
})
this.stars.forEach(function(star){
star.update(frameCount);
})
},
draw : function(){
this.meteors.forEach(function(meteor){
meteor.draw();
})
},
shouldSpawnMeteor: function(frameCount){
//spawn rate of meteors increases asymptotically with time
var invFreq = Math.ceil(10 + 35/((frameCount + 1200)/1200));
return (frameCount % invFreq == 0);
},
shouldSpawnStar: function(frameCount){
return (frameCount % 1000 == 0 && frameCount != 0);
},
spawnMeteor : function(frameCount){
var rand = Math.random();
if (frameCount < 1000) {
if (rand < 0.25) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, -2, this.previousMeteorX));
} else {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 0, this.previousMeteorX));
}
} else if (frameCount < 2500) {
if (rand < 0.15) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, -2, this.previousMeteorX));
} else if (rand < 0.35) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, -1, this.previousMeteorX));
} else if (rand < 0.6) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 0, this.previousMeteorX));
} else {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 1, this.previousMeteorX));
}
} else if (frameCount < 4500) {
if (rand < 0.12) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, -2, this.previousMeteorX));
} else if (rand < 0.20) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, -1, this.previousMeteorX));
} else if (rand < 0.5) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 0, this.previousMeteorX));
} else if (rand < 0.8) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 1, this.previousMeteorX));
} else {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 2, this.previousMeteorX));
}
} else if (frameCount < 6000) {
if (rand < 0.07) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, -2, this.previousMeteorX));
} else if (rand < 0.25) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 0, this.previousMeteorX));
} else if (rand < 0.5) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 1, this.previousMeteorX));
} else if (rand < 0.75) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 2, this.previousMeteorX));
} else {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 3, this.previousMeteorX));
}
} else if (frameCount < 6000) {
if (rand < 0.07) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, -2, this.previousMeteorX));
} else if (rand < 0.25) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 0, this.previousMeteorX));
} else if (rand < 0.4) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 1, this.previousMeteorX));
} else if (rand < 0.60) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 2, this.previousMeteorX));
} else if (rand < 0.80) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 3, this.previousMeteorX));
} else {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 4, this.previousMeteorX));
}
} else if (frameCount < 9000) {
if (rand < 0.05) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, -2, this.previousMeteorX));
} else if (rand < 0.20) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 0, this.previousMeteorX));
} else if (rand < 0.35) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 1, this.previousMeteorX));
} else if (rand < 0.55) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 2, this.previousMeteorX));
} else if (rand < 0.75) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 3, this.previousMeteorX));
} else if (rand < 0.85) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 4, this.previousMeteorX));
} else {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 5, this.previousMeteorX));
}
} else if (frameCount < 12000) {
if (rand < 0.10) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, -2, this.previousMeteorX));
} else if (rand < 0.15) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 0, this.previousMeteorX));
} else if (rand < 0.25) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 1, this.previousMeteorX));
} else if (rand < 0.40) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 2, this.previousMeteorX));
} else if (rand < 0.60) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 3, this.previousMeteorX));
} else if (rand < 0.80) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 4, this.previousMeteorX));
} else {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 5, this.previousMeteorX));
}
} else {
if (rand < 0.5) {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 4, this.previousMeteorX));
} else {
this.meteors.push(new Meteor(this.canvasCtx, this.instance_, 3, this.previousMeteorX));
}
}
this.previousMeteorX = this.meteors[this.meteors.length-1].xPos;
},
spawnStar : function(frameCount){
var rand = Math.random();
if (frameCount < 1000) {
this.stars.push(new Star(this.canvasCtx, this.instance_, 0));
} else if (frameCount < 3000) {
if (rand < 0.5) {
this.stars.push(new Star(this.canvasCtx, this.instance_, 0));
} else {
this.stars.push(new Star(this.canvasCtx, this.instance_, 1));
}
} else {
if (rand < 0.3) {
this.stars.push(new Star(this.canvasCtx, this.instance_, 0));
} else {
this.stars.push(new Star(this.canvasCtx, this.instance_, 1));
}
}
},
removeMeteors: function(){
this.meteors = [];
},
removeStars: function(){
this.stars = [];
},
removeMeteor: function(targetMeteor){
for (var i = 0; i < this.meteors.length; i++) {
if (this.meteors[i] === targetMeteor) {
this.meteors.splice(i, 1);
}
}
},
removeStar: function(targetStar){
for (var i = 0; i < this.stars.length; i++) {
if (this.stars[i] === targetStar) {
this.stars.splice(i, 1);
}
}
},
reset: function(){
this.init()
}
}