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Greenfoot exercise 9.69

By dROS, with 1 reply.
Replied to by danpost, 12 days ago:

Can anybody check my code? Code is between 77 to 89.

The condition on line 81 will always be true (that is, unless size is less than or equal to zero -- which would be never). I think you should be asking if the size is greater than 16 or not.

Exercise 9.69 Fix the score count

By dROS, with 3 replies.
Last reply by danpost, 13 days ago:

code for more classes can you check it. << Code Omitted >>

Appears okay. And, finally, your Bullet class? It would seem like that is where the collisions are detected.

How can i have a player to move a certain amount of steps in order to finish the game?

By KiddoNow, with 1 reply.
Replied to by danpost, 13 days ago:

KiddoNow wrote...

I have a player and they can move 1 step by pressing an arrowkey. Now i want them to reach an object and collecting it BUT with a certain amount of given steps. Lets say you start in the bottom left corner and the other object is somewhere in the upper right corner. Now you have to reach that object with exactly 15 steps e.g. How can i make such a counter?!

Just add an int field for the player. Increment it each time it moves. When object is reached, check its value for win/lose.

How to get the code for the Greenfoot base classes

By SailingStone, with 2 replies.
Last reply by SailingStone, 13 days ago:

Thanks for that! That helps a lot.

Objects moving from the right to te left

By SemDeBakkero, with 3 replies.
Last reply by SemDeBakkero, 13 days ago:

Aha, I didn't know that. Thanks guys

Enemies still Spawning

By Alexkr, with 3 replies.
Last reply by Alexkr, 13 days ago:

I could fix it, thank you for the fast and clear response.

Delete Account

By Galaxy, with no replies.

Hi! I was wondering if it is possible to delete my account. And if so how?

Error

By Nate2002, with 3 replies.
Last reply by Nate2002, 14 days ago:

Thanks it works now :)

Turn Object to the direction of the mouse

By SemDeBakkero, with 10 replies.
Last reply by SemDeBakkero, 14 days ago:

danpost wrote...

Just to be clear, an actor with zero rotation is considered to be facing (or turned towards) the right. If the image given the actor is not one that naturally "faces" right, then you will need to do something extra to make it appear properly. Let us say that you have a rocket image which "faces" up as it would when in a landed orientation. You could set it as the default image and change its orientation in the constructor of the class:

Remove bullet after killing

By SemDeBakkero, with 2 replies.
Last reply by SemDeBakkero, 14 days ago:

danpost wrote...

You are calling two methods, each which could remove the actor from the world (lines 12 and 13). Neither of these methods can execute properly if the actor is not in the world (one uses getOneObjectAtOffset and the other isAtEdge,, both requiring the actor be in a world). Regardless of the order these methods are called, if the first one removes the actor, the second one will fail. There are two main ways to avoid this dilemma. One is to not remove the actor is those called method, but have them return a boolean value indicating the "to-remove" state

Programming of a ghost in pacman

By annika.g, with 1 reply.
Replied to by Super_Hippo, 15 days ago:

You can check my Pac-Man game here: https://www.greenfoot.org/scenarios/19573 It is pretty similar to the original one and you can view the source. However, it is mostly in German. The code for the ghosts is located in the Geist class.

Looking for help if possible please...

By Jamyjambo, with 6 replies.
Last reply by danpost, 15 days ago:

<Code Omitted>would check top center of the collector. You may want to also check the height of the trash above ground -- make sure it is within a specific range (minimum range would be fall speed of trash) before collecting it (before the catch is executed).

AUTUM PROJEXT - Greenfoot book scenario

By dROS, with 3 replies.
Last reply by Super_Hippo, 15 days ago:

Any reason why it has to be checked in the Block class code instead of the Leaf class code? In the Leaf class, it can simply be: <Code Omitted> To do what danpost said, it will look like this: <Code Omitted>

Spawning an actor on the right side of the world

By MLGwarfare, with 8 replies.
Last reply by danpost, 17 days ago:

MLGwarfare wrote...

I keep getting an error for the getWorld (showed in code) and I do not know how to make it work. do you know how I would be able to change the code to make it compile correctly?

The getWorld method is an Actor class method. You cannot execute it on a World object. Anyway, the code from line 23 to line 28 appears to be something an oil object might want to do -- not the World object.

How do you create an array for spawning actors in a random order

By KylesGallery, with 9 replies.
Last reply by danpost, 17 days ago:

You are still trying to execute the spawning code prior to the ArraySelection actor being put in the world. Make use of the Actor class method called addedToWorld.

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