Flash Script – Star Field Effect

Creating a starfield effect is easy! To begin, download the sample files here.

1. Create a small star shape, and convert it to a movie clip. Give it an instance name of star.

2. Extend the existing layer by three frames. Then, create a new layer above the existing layer, and create three blank frames in this layer.

3. In the first layer, insert the actions:

numstars = 100; 

speed = 5; 

star_field = new Array (numstars); 

//x is x axis, y is y axis, speed is speed of star 

function star(x,y,z) 

{ 

  this.x = x; 

  this.y = y; 

  this.speed = speed; 

} 

for (i=0;i<numstars;i++) 

{ 

 star_field[i] = new star(random(300),random(200),random(speed)+1); 

 duplicateMovieClip ("star", "star_" add i, i+10); 

}

4. In the second key frame, insert this action:

for (i=0;i<numstars;i++) 

{ 

 star_field[i].x+= star_field[i].speed; 

 if (star_field[i].x>300) { star_field[i].x = 0; } 

 setProperty ("star_" add i , _x , star_field[i].x ) 

 setProperty ("star_" add i , _y , star_field[i].y ) 

 setProperty ("star_" add i , _alpha , star_field[i].speed*40 ) 

}

5. Finally, in the third, insert:

gotoAndPlay (2);

That’s it! Test the movie!