data = ‘http://sitepointstatic.com/flash/starfield.swf’
width = ’400′
height = ’400′
bgcolor = ‘black’
>
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!
