Create a Flash game like Metro Siberia Underground – AS3 version

September 13, 2012 • Actionscript 3, Flash, Game design by Emanuele Feronato • 6 Comments

More than 4 years ago I played a really fun game called Metro Siberia Underground, basically an helicopter game, and made an AS2 prototype.

Now I ported it into AS3 because I think the prototype can be improved or ported into other languages, and because I always liked one-button games.

The code is not commented because the entire logic behind it has been already explained in the original post.

package {
	import flash.display.Sprite;
	import flash.filters.GlowFilter;
	import flash.events.Event;
	import flash.events.MouseEvent;
	public class Main extends Sprite {
		private var shipFilter:GlowFilter=new GlowFilter(0x00ff00,0.8,4,4,2,3,false,false);
		private var smokeFilter:GlowFilter=new GlowFilter(0xff0000,0.8,4,4,2,3,false,false);
		private var fuelFilter:GlowFilter=new GlowFilter(0x00ffff,0.8,4,4,2,3,false,false);
		private var rockFilter:GlowFilter=new GlowFilter(0xffffff,0.8,4,4,2,3,false,false);
		private var scoreFilter:GlowFilter=new GlowFilter(0xff00ff,0.8,2,4,2,3,false,false);
		private var gravity:Number=0.1;
		private var thrust:Number=0.25;
		private var yspeed:Number=0;
		private var xspeed:Number=5;
		private var distance:Number=0;
		private var smokeInterval:Number=10;
		private var framesPassed:Number=0;
		private var fuelFrequency:Number=10;
		private var gasoline:Number=500;
		private var rockFrequency:Number=50;
		private var engines:Boolean=false;
		private var ship:Ship=new Ship();
		private var score:Score=new Score();
		private var rockCanvas:Sprite=new Sprite();
		private var fuelCanvas:Sprite=new Sprite();
		private var smokeCanvas:Sprite=new Sprite();
		private var fuelVector:Vector.<Fuel>=new Vector.<Fuel>();
		private var rockVector:Vector.<Rock>=new Vector.<Rock>();
		private var smokeVector:Vector.<Smoke>=new Vector.<Smoke>();
		public function Main() {
			addChild(ship);
			ship.x=120;
			ship.y=240;
			ship.filters=new Array(shipFilter);
			addChild(score);
			addChild(rockCanvas);
			addChild(fuelCanvas);
			addChild(smokeCanvas);
			score.filters=new Array(scoreFilter);
			addEventListener(Event.ENTER_FRAME,update);
			stage.addEventListener(MouseEvent.MOUSE_DOWN,engineOn);
			stage.addEventListener(MouseEvent.MOUSE_UP,engineOff);
		}
		private function engineOn(e:MouseEvent):void {
			engines=true;
			framesPassed=smokeInterval;
		}
		private function engineOff(e:MouseEvent):void {
			engines=false;
			smokeInterval=10;
		}
		private function update(e:Event):void {
			if (Math.random()*1000<fuelFrequency) {
				var fuel:Fuel=new Fuel();
				fuel.y=Math.random()*400+40;
				fuel.x=650;
				fuel.filters=new Array(fuelFilter);
				fuelCanvas.addChild(fuel);
				fuelVector.push(fuel);
			}
			if (Math.random()*1000<rockFrequency) {
				var rock:Rock=new Rock();
				rock.y=Math.random()*400+40;
				rock.x=670;
				rock.rotation=Math.random()*360;
				rock.filters=new Array(rockFilter);
				rockCanvas.addChild(rock);
				rockVector.push(rock);
			}
			distance+=xspeed;
			score.scoreText.text="Distance: "+distance+" - "+"Fuel: "+gasoline;
			if ((gasoline>0)&&(engines)) {
				yspeed-=thrust;
				smokeInterval-=0.25;
				gasoline-=1;
				framesPassed++;
				if (smokeInterval<framesPassed) {
					var smoke:Smoke=new Smoke();
					smoke.x=ship.x;
					smoke.y=ship.y;
					smoke.filters=new Array(smokeFilter);
					smokeCanvas.addChild(smoke);
					smokeVector.push(smoke);
					framesPassed=0;
					smokeInterval-=0.01;
				}
			}
			yspeed+=gravity;
			ship.y+=yspeed;
			angle=Math.atan2(yspeed,xspeed);
			ship.rotation=angle*180/Math.PI;
			for (var i:int=fuelVector.length-1; i>=0; i--) {
				fuelVector[i].x-=xspeed*1.2;
				var dist_x:Number=ship.x+28*Math.cos(angle)-fuelVector[i].x;
				var dist_y:Number=ship.y+28*Math.sin(angle)-fuelVector[i].y;
				var dist:Number = Math.sqrt(dist_x*dist_x+dist_y*dist_y);
				if (dist<10) {
					gasoline+=100;
					fuelCanvas.removeChild(fuelVector[i]);
					fuelVector.splice(i,1);
				}
				else {
					if (fuelVector[i].x<-10) {
						fuelCanvas.removeChild(fuelVector[i]);
						fuelVector.splice(i,1);
					}
				}
			}
			for (i=rockVector.length-1; i>=0; i--) {
				rockVector[i].x-=xspeed;
				if (rockVector[i].x<-20) {
					rockCanvas.removeChild(rockVector[i]);
					rockVector.splice(i,1);
				}
			}
			for (i=smokeVector.length-1; i>=0; i--) {
				smokeVector[i].x-=xspeed;
				smokeVector[i].width+=0.2;
				smokeVector[i].height+=0.2;
				smokeVector[i].alpha-=0.04;
				if (smokeVector[i].alpha<0) {
					smokeCanvas.removeChild(smokeVector[i]);
					smokeVector.splice(i,1);
				}
			}
			if (ship.y>480 || ship.y<0 || rockCanvas.hitTestPoint(ship.x+28*Math.cos(angle), ship.y+28*Math.sin(angle), true) || rockCanvas.hitTestPoint(ship.x+8*Math.cos(angle+Math.PI/2), ship.y+8*Math.sin(angle+Math.PI/2), true) || rockCanvas.hitTestPoint(ship.x+8*Math.cos(angle-Math.PI/2), ship.y+8*Math.sin(angle-Math.PI/2), true)) {
				yspeed=0;
				ship.y=200;
				gasoline=500;
				distance=0;
				rockVector=new Vector.<Rock>();
				removeChild(rockCanvas);
				rockCanvas=new Sprite();
				addChild(rockCanvas);
				fuelVector=new Vector.<Fuel>();
				removeChild(fuelCanvas);
				fuelCanvas=new Sprite();
				addChild(fuelCanvas);
				smokeVector=new Vector.<Smoke>();
				removeChild(smokeCanvas);
				smokeCanvas=new Sprite();
				addChild(smokeCanvas);
			}
		}
	}
}

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package {

import flash.display.Sprite;

import flash.filters.GlowFilter;

import flash.events.Event;

import flash.events.MouseEvent;

public class Main extends Sprite {

private var shipFilter:GlowFilter=new GlowFilter(0x00ff00,0.8,4,4,2,3,false,false);

private var smokeFilter:GlowFilter=new GlowFilter(0xff0000,0.8,4,4,2,3,false,false);

private var fuelFilter:GlowFilter=new GlowFilter(0x00ffff,0.8,4,4,2,3,false,false);

private var rockFilter:GlowFilter=new GlowFilter(0xffffff,0.8,4,4,2,3,false,false);

private var scoreFilter:GlowFilter=new GlowFilter(0xff00ff,0.8,2,4,2,3,false,false);

private var gravity:Number=0.1;

private var thrust:Number=0.25;

private var yspeed:Number=0;

private var xspeed:Number=5;

private var distance:Number=0;

private var smokeInterval:Number=10;

private var framesPassed:Number=0;

private var fuelFrequency:Number=10;

private var gasoline:Number=500;

private var rockFrequency:Number=50;

private var engines:Boolean=false;

private var ship:Ship=new Ship();

private var score:Score=new Score();

private var rockCanvas:Sprite=new Sprite();

private var fuelCanvas:Sprite=new Sprite();

private var smokeCanvas:Sprite=new Sprite();

private var fuelVector:Vector.<Fuel>=new Vector.<Fuel>();

private var rockVector:Vector.<Rock>=new Vector.<Rock>();

private var smokeVector:Vector.<Smoke>=new Vector.<Smoke>();

public function Main() {

addChild(ship);

ship.x=120;

ship.y=240;

ship.filters=new Array(shipFilter);

addChild(score);

addChild(rockCanvas);

addChild(fuelCanvas);

addChild(smokeCanvas);

score.filters=new Array(scoreFilter);

addEventListener(Event.ENTER_FRAME,update);

stage.addEventListener(MouseEvent.MOUSE_DOWN,engineOn);

stage.addEventListener(MouseEvent.MOUSE_UP,engineOff);

}

private function engineOn(e:MouseEvent):void {

engines=true;

framesPassed=smokeInterval;

}

private function engineOff(e:MouseEvent):void {

engines=false;

smokeInterval=10;

}

private function update(e:Event):void {

if (Math.random()*1000<fuelFrequency) {

var fuel:Fuel=new Fuel();

fuel.y=Math.random()*400+40;

fuel.x=650;

fuel.filters=new Array(fuelFilter);

fuelCanvas.addChild(fuel);

fuelVector.push(fuel);

}

if (Math.random()*1000<rockFrequency) {

var rock:Rock=new Rock();

rock.y=Math.random()*400+40;

rock.x=670;

rock.rotation=Math.random()*360;

rock.filters=new Array(rockFilter);

rockCanvas.addChild(rock);

rockVector.push(rock);

}

distance+=xspeed;

score.scoreText.text="Distance: "+distance+" - "+"Fuel: "+gasoline;

if ((gasoline>0)&&(engines)) {

yspeed-=thrust;

smokeInterval-=0.25;

gasoline-=1;

framesPassed++;

if (smokeInterval<framesPassed) {

var smoke:Smoke=new Smoke();

smoke.x=ship.x;

smoke.y=ship.y;

smoke.filters=new Array(smokeFilter);

smokeCanvas.addChild(smoke);

smokeVector.push(smoke);

framesPassed=0;

smokeInterval-=0.01;

}

yspeed+=gravity;

ship.y+=yspeed;

angle=Math.atan2(yspeed,xspeed);

ship.rotation=angle*180/Math.PI;

for (var i:int=fuelVector.length-1; i>=0; i--) {

fuelVector[i].x-=xspeed*1.2;

var dist_x:Number=ship.x+28*Math.cos(angle)-fuelVector[i].x;

var dist_y:Number=ship.y+28*Math.sin(angle)-fuelVector[i].y;

var dist:Number = Math.sqrt(dist_x*dist_x+dist_y*dist_y);

if (dist<10) {

gasoline+=100;

fuelCanvas.removeChild(fuelVector[i]);

fuelVector.splice(i,1);

}

else {

if (fuelVector[i].x<-10) {

fuelCanvas.removeChild(fuelVector[i]);

fuelVector.splice(i,1);

}

for (i=rockVector.length-1; i>=0; i--) {

rockVector[i].x-=xspeed;

if (rockVector[i].x<-20) {

rockCanvas.removeChild(rockVector[i]);

rockVector.splice(i,1);

}

for (i=smokeVector.length-1; i>=0; i--) {

smokeVector[i].x-=xspeed;

smokeVector[i].width+=0.2;

smokeVector[i].height+=0.2;

smokeVector[i].alpha-=0.04;

if (smokeVector[i].alpha<0) {

smokeCanvas.removeChild(smokeVector[i]);

smokeVector.splice(i,1);

}

if (ship.y>480 || ship.y<0 || rockCanvas.hitTestPoint(ship.x+28*Math.cos(angle), ship.y+28*Math.sin(angle), true) || rockCanvas.hitTestPoint(ship.x+8*Math.cos(angle+Math.PI/2), ship.y+8*Math.sin(angle+Math.PI/2), true) || rockCanvas.hitTestPoint(ship.x+8*Math.cos(angle-Math.PI/2), ship.y+8*Math.sin(angle-Math.PI/2), true)) {

yspeed=0;

ship.y=200;

gasoline=500;

distance=0;

rockVector=new Vector.<Rock>();

removeChild(rockCanvas);

rockCanvas=new Sprite();

addChild(rockCanvas);

fuelVector=new Vector.<Fuel>();

removeChild(fuelCanvas);

fuelCanvas=new Sprite();

addChild(fuelCanvas);

smokeVector=new Vector.<Smoke>();

removeChild(smokeCanvas);

smokeCanvas=new Sprite();

addChild(smokeCanvas);

}

and this is the result:

Press mouse button to fly. I am also thinking about a Box2D helicopter game, it would be interesting.

Download the source code

Rate this post: 1 Star

(8 votes, average: 4.88 out of 5)

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This post has 6 comments

Gordon

on September 15, 2012 at 6:59 am

I already made a “Box2D helicopter game” called Rubble Racer (http://irregulargames.com/rubble-racer/) ;)
Mario

on September 18, 2012 at 2:18 pm

Waiting for helicopter game tutorial :)
Yakup TA?LIBEYAZ

on September 26, 2012 at 7:22 am

is a great application
Franklin

on September 26, 2012 at 8:15 am

How can I add a game menu to this? I tried adding a scene in flash cs6 but it doesn’t work, I’ve been trying for hours.

Any help?
benny qibal

on October 24, 2012 at 6:12 pm

thnks so much i love your blog + for your share, thankyu guys
(New Game) Little Spaceship - Talk Arcades

on May 11, 2013 at 3:04 pm

[...] good job swapping two MovieClips, adding your logo and leaderboard :-) http://www.emanueleferonato.com/2012…d-as3-version/ __________________ Click to publish! Free Multiplayer Online Games | Play & Download Online [...]

Emanuele Feronato

italian geek and PROgrammer

Create a Flash game like Metro Siberia Underground – AS3 version

This post has 6 comments

Gordon

Mario

Yakup TA?LIBEYAZ

Franklin

benny qibal

(New Game) Little Spaceship - Talk Arcades