Emanuele Feronato

italian geek and PROgrammer

Talking about Metro Siberia Underground game, Flash and Game development.

Multipart tutorial: available parts 1, 2, 3, 4 ,5

In the 3rd part I’ll leave the tunnel for a future use and I will introduce some “asteroids”, some “fuel tanks” and the distance traveled so far.

I suggest to read part 1 and 2 before reading this one

It’s not a line-by-line commented tutorial, I am just sharing the source code at the moment, a full explication will come soon

* edit: full explication available

import flash.filters.GlowFilter;
var ship_filter:GlowFilter = new GlowFilter(0x00ff00, 0.8, 4, 4, 2, 3, false, false);
var smoke_filter:GlowFilter = new GlowFilter(0xff0000, 0.8, 4, 4, 2, 3, false, false);
var tunnel_filter:GlowFilter = new GlowFilter(0xffff00, 0.8, 4, 4, 2, 3, false, false);
var fuel_filter:GlowFilter = new GlowFilter(0x00ffff, 0.8, 4, 4, 2, 3, false, false);
var rock_filter:GlowFilter = new GlowFilter(0xffffff, 0.8, 4, 4, 2, 3, false, false);
var score_filter:GlowFilter = new GlowFilter(0xff00ff, 0.8, 2, 4, 2, 3, false, false);
gravity = 0.1;
thrust = 0.25;
yspeed = 0;
xspeed = 5;
distance = 0;
smoke_interval = 10000;
frames_passed = 0;
tunnel_height = 150;
fuel_freq = 10;
gasoline = 500;
rock_freq = 50;
engines = false;
_root.attachMovie("ship", "ship", _root.getNextHighestDepth(), {_x:150, _y:200});
_root.createEmptyMovieClip("fuel_movie", _root.getNextHighestDepth());
_root.createEmptyMovieClip("deadly_movie", _root.getNextHighestDepth());
_root.attachMovie("score", "score", _root.getNextHighestDepth());
ship.filters = new Array(ship_filter);
score.filters = new Array(score_filter);
ship.onEnterFrame = function() {
	score.sc.text = "Distance: "+distance+" - "+"Fuel: "+gasoline;
	if ((gasoline>0)and(engines)) {
		yspeed -= thrust;
		smoke_interval -= 0.25;
		gasoline -= 1;
	}
	if (Math.random()*1000=smoke_interval) {
		sm = _root.attachMovie("smoke", "smoke"+_root.getNextHighestDepth(), _root.getNextHighestDepth(), {_x:this._x-2, _y:this._y});
		sm.filters = new Array(smoke_filter);
		sm.onEnterFrame = function() {
			this._x -= xspeed;
			this._width += 0.2;
			this._height += 0.2;
			this._alpha -= 2;
			if (this._alpha<=0) {
				this.removeMovieClip();
			}
		};
		frames_passed = 0;
	}
	if ((this._y>400) or (this._y<0) or deadly_movie.hitTest(this._x+28*Math.cos(angle), this._y+28*Math.sin(angle), true) or deadly_movie.hitTest(this._x+8*Math.cos(angle+Math.PI/2), this._y+8*Math.sin(angle+Math.PI/2), true) or deadly_movie.hitTest(this._x+8*Math.cos(angle-Math.PI/2), this._y+8*Math.sin(angle-Math.PI/2), true)) {
		yspeed = 0;
		this._y = 200;
		gasoline = 500;
		distance = 0;
		deadly_movie.removeMovieClip();
		fuel_movie.removeMovieClip();
		_root.createEmptyMovieClip("fuel_movie", _root.getNextHighestDepth());
		_root.createEmptyMovieClip("deadly_movie", _root.getNextHighestDepth());
	}
};
_root.onMouseDown = function() {
	engines = true;
	smoke_interval = 10;
};
_root.onMouseUp = function() {
	engines = false;
	smoke_interval = 100000;
};

And this is the result. White blocks are deadly while blue circles raise your fuel.

Download the source code and tell me what do you think about it.

Multipart tutorial: available parts 1, 2, 3, 4 ,5