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On this Actionscript 3.0 Flash HD High Definition Tutorial we create a base for our Flying Saucer and testing collision with an IF statement a visible property change is fired. X Files Theme is the background music.

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Here is the source code

// Collision Between Two Objects on Stage Example
// by Avraham Saltoun
// solutions at say-web dot com
// FREE TO USE COPY AND DISTRIBUTE

stage.addEventListener(KeyboardEvent.KEY_DOWN,MoveSaucer);

//This will set the compiler
//waiting for a key stroke, and then
// execute the MoveSaucer function

function MoveSaucer (event:KeyboardEvent):void
// the void states that the function returns no value
// but receives the value of the key stroke
{
switch (event.keyCode){

case Keyboard.RIGHT:
FlyingSaucer_mc.x = FlyingSaucer_mc.x+5;
break;
// x is the coordinate for the horizontal position
// break will exit the switch and wait for
// next key stroke.

case Keyboard.LEFT:
FlyingSaucer_mc.x -=5;
// “FlyingSaucer_mc.x = FlyingSaucer_mc.x-5″
// is the same as
// “FlyingSaucer_mc.x -=5;”
break;

case Keyboard.UP:
FlyingSaucer_mc.y -=5;
break;

case Keyboard.DOWN:
FlyingSaucer_mc.y +=5;
break;

}

// This will check the collision
// between the Flying Saucer and
// the base.

if (FlyingSaucer_mc.hitTestObject(Base_mc))
{trace (“BOOOM !!!”);}

// Note both objects can be in separate layers
// instance names have to be identical to the objects
// This will happen every keystroke (Key Down) event

// Thanks for watching.

}