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Current Discussions

Creating an instance Variable?

By jstofer2, with 2 replies.
Last reply by jstofer2, about 4 hours ago:

Spawning character on key press & sound playing

By MLGwarfare, with 1 reply.
Replied to by albertlai431, about 5 hours ago:

You'll have to put those if statements in the act method of the world, since the constructor is only called once when the world is declared. You'll want to be continuously checking if the space button is pressed, not only once.

Collection System

By HEISENBERG, with 4 replies.
Last reply by danpost, about 13 hours ago:

HEISENBERG wrote...

No, I don't think so... I'm calling the collect method, and in there is the Actor

Please show entire class codes.

Trying to minimize lag on Greenfoot website?

By albertlai431, with 12 replies.
Last reply by danpost, about 14 hours ago:

It would probably take a member of the greenfoot team to confirm, but I get the distinct feeling the answer is no. Before they went to javascript and having their own Color and Font classes, my TextImage support class would allow GreenfootImage objects to be created using a specified font. Unfortunately, it is now pretty much obsolete.

Greenfoot Bug??? (Again)

By ITStudent, with 3 replies.
Last reply by ITStudent, about 19 hours ago:

Okay, so i had made a new static int PO and now its working fine. Maybe it was a bug from Greenfoot

Where can I get a copy of crab2.png?

By Hal_cat, with 1 reply.
Replied to by danpost, 1 day ago:

Download the book scenarios. All crab scenarios in chapter02-04 have it.

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

By KylesGallery, with 7 replies.
Last reply by danpost, 1 day ago:

Line 13, which should be my unmodified line 2 above, was to be placed before line 6. Line 8 should not contain the comma nor the expression following it. So, the starting codes should look like this:

mirrorVertically problem

By Hundmat, with 1 reply.
Replied to by danpost, 1 day ago:

The line: <Code Omitted>mirrors the current image. When executed again, it mirrors that mirrored image. Etc. You will either have to keep track of whether each image in each array is already mirrored or not OR keep and use the mirrored images in separate arrays.

Sound = playing a sound of a World, if no other Sound is playing

By ITStudent, with 4 replies.
Last reply by ITStudent, 1 day ago:

Finally it works. Thank You I just typed public static final before GreenfootSound and now everything works fine. Chapter closed! :D

Adding increasing levels to game.

By AVH, with 3 replies.
Last reply by danpost, 1 day ago:

Is there a better or easier way to add levels after the orcs are removed. I'm getting confused with the code.

??? Better or easier than what? I do not see any codes either checking for no orcs or for changing levels?

Problem about BGM

By MianBao_Bread, with 2 replies.
Last reply by ITStudent, 1 day ago:

Code 1 : U can use GreenfootSound bgm = new GreenfootSound("bgm.wav"); if(!bgm.isPlaying()){bgm.play();} Code 2 should work fine! Afterall i have a SoundProblem too (see Discussions)

Switching between Worlds

By ihjufaeshiju, with 2 replies.
Last reply by ihjufaeshiju, 1 day ago:

Thanks, this worked very nicely.

Looking for help if possible please...

By Jamyjambo, with 4 replies.
Last reply by danpost, 2 days ago:

Jamyjambo wrote...

Would I just be using getWorld to remove one then add the other?

Yes -- but it would be wise to add the Splat object first or the Trash object will lose any reference to the world it was in.

Reflection law calculate new direction (Tank Game)

By SushiLlama, with 32 replies.
Last reply by SushiLlama, 3 days ago:

Tried all of them. It made the amount of disappearing shells even larger, im afraid.

danpost wrote...

See if a larger value than 99 (and -99) will do the trick. Try 100, 150, 199 (I would not think more than 199 would be needed. The initial 99 was for the fact that the QActor is not placed at its Q-location (cannot be placed between pixels on the screen). The additional amount I am suggesting now is for the change in rotation of the actor (the center of the image along an even sized dimension is a half pixel off from where the actor is actually placed on the screen). These values are on the

Animation

By Hundmat, with 1 reply.
Replied to by danpost, 3 days ago:

Hundmat wrote...

I have seen several ways to animate images in greenfoot, but which is the most convenient way of coding it. Right now I'm using this << Code Omitted >>

Convenient? ... probably what you have is most convenient for you. However, convenient is not necessarily best. Use of the array is an excellent choice. Using a double value for an integer index does not seem appropriate. In fact, it is not possible for a computer to store the value of one-fifth exactly. And, although it may seem like a moot point, computations using double values takes longer than when using int v

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