| <Ramdon
Numbers > level
- Intermediate
In Actionscript you
can emulate a simply random math function such as rolling a
dice. When you roll a dice you have a one in six chance of getting
a number one through six. You can construct a simple flash game
to illustrate this function. The first thing we need to do is
create a movie clip that has six frames displaying each side
of the dice. Then we need to create a button called "random".
If the project is done correctly the dice should reveal a number
when the button is pressed. Below is the code for this simple
game. (I am using ActionScript 3 here. The basic principal of
this code is identical in ActionScript 2.)
random.mc.addeventListener(MouseEvent.Click,
onClick);
function onClick(event:MouseEvent):void
{
dice_mc.gotoAndStop(Math.ceil(Math.random()
* 6));
}
Dice
(dice_mc)
is our movie clip with the six sides of the dice represented
in its frames. The Math.random()
* 6
code randomly selects one of the six frames when the button
random_mc is pressed. The
gotoAndStop
function simply stops the frame that has been randomly selected.
What if you wanted to randomly select letters of the alphabet.
The code would be virtually the same as the one we used for
the dice program. The main change
would be changing the 6 to 26 in
the Math.random code since there are 26 letters in the alphabet.
Of course you would have to list all the letters of the alphabet
in the frames of the movie clip (letters_mc).
An example of the main code is below.
letters_mc.gotoAndStop(Math.ceil(Math.random()
* 26));
All that has been changed here is the dice movie clip is now
called letters and the random number has been changed from 6
to 26.
To make this project more interesting we could create a flash
program that randomly spells a three letter word. We now would
create three movie clips randomly generating letters. You would
keep on pressing the random button until you spelled a word.
Here is a sample of that code.
random.mc.addeventListener(MouseEvent.Click,
onClick);
function onClick(event:MouseEvent):void
{
letters1_mc.gotoAndStop(Math.ceil(Math.random() * 26));
letters2_mc.gotoAndStop(Math.ceil(Math.random()
* 26));
letters3_mc.gotoAndStop(Math.ceil(Math.random() * 26));
}
A sample of this project is on the top of the next column.
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Generating
a random word.
Click
here
to see sample
We
could also use similar code to create a slot machine game.
Like the word generating code we would have three movie clips
generating frame objects. This time the frame objects are
5 fruits and one number 7 instead of the 26 letters of the
alphabet. The ActionScript code would look like this.
spin.mc.addeventListener(MouseEvent.Click,
onClick);
function onClick(event:MouseEvent):void
{
matches1_mc.gotoAndStop(Math.ceil(Math.random() * 6));
matches2_mc.gotoAndStop(Math.ceil(Math.random() * 6));
matches3_mc.gotoAndStop(Math.ceil(Math.random() * 6));
}
Below is the game based on the above code.
Slot Machine Game
Click
here to
see sample
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