Scratch

NeilWest wrote:

I'm making a XY scrolling zombie game and I need to know, how do I make the zombies move in a scrolling game? Example, the goombas in the Mario series, they move according to the scrolling but also move by themselves- does anyone know how to do it?

That's AI. AI stands for Artificial Intelligence.

What you want to do is create a script for many scenarios. If you want zombies to be provoked and attack when the player comes near, you should create a script telling the zombie that if the player is in such a distance, it should attack it. If you just want a plain goomba like thing, it should be able to sense walls, tiles, blocks and of course, the PLAYER!

I'm sure if you searched the Scratch Website, you could find a few examples.

If you'd like to read up on it , then click here.

Well, you do it the same way with the terrain. You need a variable x and variable y (not the blue ones) and then you have the sprite go to (x of sprite) - (x of player) and same with y. So basically, it goes to it's own position subtracted by the player's position.

So if the player's position is 50x 50y and the sprite/object's position is 25x 25y then it goes to -25x -25y. Then when you want it to move, just change the variables x and y to it's new position. 

I'm sure you could do it with addition, but I learned using subtraction.

Player Script:

when gf clicked
set [x v] to (0)
set [y v] to (0)
forever
    go to x:(0) y:(0)

    if <key [up arrow v] pressed?>
        change [y v] by (2)
    end

    if <key [down arrow v] pressed?>
        change [y v] by (-2)
    end

    if <key [right arrow v] pressed?>
        change [x v] by (2)
    end

    if <key [left arrow v] pressed?>
        change [x v] by (-2)
    end
end

Object Script:

when gf clicked
set [object_x v] to (25)
set [object_y v] to (25)
forever
    go to ( (object_x) - (x) ) ( (object_y) - (y) )
end

Then you can add you own AI code to change the x and y of the object to make it move around. 

Last edited by Magnie (2012-02-21 21:02:47)

The way I have done it is to make it, when idle, go to the X or Y of the scrolling, and when it needs to move just use the

change x by ()

.
Using this method you should be able to create some sort of basic movement, while still making it work with scrolling.