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objects placed into arrays

3 replies on 1 page. Most recent reply: Dec 6, 2005 10:46 PM by Matthias Neumair

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paul watson

Posts: 3
Nickname: zoidberg
Registered: Dec, 2005

objects placed into arrays

Posted: Dec 6, 2005 6:06 AM

hello!

I have created a 10x10 array of buttons in a grid formation, however i wondered if anyone can help me to place objects of a set length randomly into the array??

I know this will involve math.RANDOM, but it is items that have 4 different set lengths and i dont know how to keep these objects of one set length together and then store them into the array??

here's my code for the array:

JButton[][] enemyButtons = new JButton[10][10];
for (int i = 0; i < enemyButtons.length; i++)
{
for (int j = 0; j < enemyButtons.length; j++)
{

enemyButtons[j] = new JButton();
enemyButtons[j].setPreferredSize(gridButtonSize);
//enemyButtons[j].addActionListener(new myEvent());
enemyButtons[j].setBackground(Color.yellow);

grid2.add(enemyButtons[j]);
}
}

any help would be amazing, thank you!!!

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: objects placed into arrays

Posted: Dec 6, 2005 6:36 AM

You mean:
Pick a random number in the Array, then fill l fields including the selected field.
Right?

What I would do: Create a list of all fields that are capable of storing n Objects in a row.

A good clas for storing the Positions would be java.awt.Point.

At the end you should have a List containing this Points:

p([0 .. 9][0 .. (10-n+1)])

The list has a certain length s;

**Loop Start
generate a random number from 0 to s-1.
Read the points coordinates xRandom and yRandom.

Fill the Array from thisposition with n Objects.

Remove all Points from the list which have y = yRandom and
Math.abs(x-xRandom) < (n-1)

**Loop End
Exit Loop when the list of Points is empty.

If n changes after an insertions, the loop must be regenerated.

paul watson

Posts: 3
Nickname: zoidberg
Registered: Dec, 2005

Re: objects placed into arrays

Posted: Dec 6, 2005 8:58 AM

umm ok cool, i got really confused!!

so first: create a class called ship that contains ints submarine, cruiser, destroy and battleship and then give each of these ints a set length!

second: i didn't understand what the list did really, sorry!? I want to be able to store these ints within the array so that when someone clicks on one of them i can call a eventAction.

sorry for being thick about this!!

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: objects placed into arrays

Posted: Dec 6, 2005 10:46 PM

The list just stores every valid startpoint to insert objects of a certain length.

But don't worry, it wouldn't have worked anyway since
a) it only stores points to insert objects horizontally and
b) now I know that you want to play battle ships and need to insert objects of a variable length.

It would have been a good solution for storing many objects fast and without a endless loop

So forget all about the list.

1) Create a random point (x,y) and create a random direction (values from 0 to 3).
2) check if the random point and the n fields in the given direction are not occpied. If they are, return to 1).
3) occupy the fields with your ship.

Since you have only a few ships, you won't end in a endless loop.

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