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 Tutorials » Games
The two starfield Actionscripts are much simpler and deal just with the expansion of the objects, which makes it look like the stars are getting closer and even passing the player. Here is the code for "starfield1", our field of small stars. Place this code in the "starfield1" instance's Actions box:
onClipEvent(load)
{
thrust = 0;
}
onClipEvent (enterFrame)
{
approachSpeed = (.08 * thrust);
this._height+=approachSpeed;
this._width+=approachSpeed;
if (Key.isDown(Key.TAB))
{
if (thrust <= 9)
{
thrust+=1;
}
}
if (Key.isDown(Key.CONTROL))
{
if (thrust>=-12)
{
thrust-=1;
}
}
}
The (load) section consists of only defining the thrust variable. Again, as the movie
starts, the player has no forward thrust. Unlike planet1 "approachSpeed" of the
starfields are static - they do not change according to width or distance travelled. After setting the rate
of expansion of the object, the bottom of the script is the exact same as the planet1
script, with the TAB and CONTROL keystroke handlers.
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Programming Starfields for Realistic 3D Space Flight
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