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Reflection law calculate new direction (Tank Game)

By SushiLlama, with 17 replies.
Last reply by SushiLlama, about 4 hours ago:

Sadly the shell now just folds like paper when hitting a wall. It seems like the turn axis is the back of the shell :( By the way i removed the move in the beginning of the method because the shell already moved at that point

How can i make a key press show an image and change back and other stuff

By AVH, with 4 replies.
Last reply by AVH, about 17 hours ago:

Thanks got it working

How can i solve this lagging problem?

By KiddoNow, with 2 replies.
Last reply by KiddoNow, about 20 hours ago:

danpost wrote...

Check your speed slider and make sure it is about in the middle of the bar. Make sure you are not using Greenfoot.delay unnecessarily. Check that you do not have an over-abundance of actors in your world. Those are usual reasons for lagging. Excessive image manipulation can also tax the CPU and cause lagging. If you feel none of these is the cause, you may need to show all your code (uploading the scenario with published source would be the easiest way to make the codes available to others).

Thank you so so so much! It was, indeed, because there were

Selecting only one spacecraft

By Finn.C, with 1 reply.
Replied to by danpost, 2 days ago:

Finn.C wrote...

Hi! I was just trying to make an space invaider type of game and was wondering how I can only select one thing out of a bunch. For Example: I have 10 spacecrafts and only want one to shoot. Is there a way to do that? Thanks!

Random? From world? <Code Omitted>

How can I make a object change color when the mouse is on it?

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

The condition on line 15 will be true-- that is, the mouse will not be detected as moving on this object unless the mouse is moved on this object. To clarify, t will not be detected as moving on this object if the the mouse is ON the object, but does NOT move. Only change back to normal image BOTH when mouse moves, AND NOT on this object: <Code Omitted>

How do I create a countdown timer for my game?

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

Please refer to my Value Display Tutorial scenario.

Please help me with my assignment

By addia, with 8 replies.
Last reply by danpost, 3 days ago:

In the quoted code, you do not need the score until after line 8. Maybe you can work with the following:

Broken application language/translation

By MbahX, with 1 reply.
Replied to by nccb, 4 days ago:

To check your language, close Greenfoot, load up C:\Users\YOURUSERNAME\greenfoot\greenfoot.properties in a text editor. Find the line "bluej.language=" and change it to bluej.language=english , then save the file and load Greenfoot. If the problem still persists, I would try upgrading or reinstalling your graphics card drivers, and/or making sure you are on the latest version of Greenfoot (3.6.0)

Check something is disappear in world

By MianBao_Bread, with 2 replies.
Last reply by MianBao_Bread, 5 days ago:

danpost wrote...

MianBao_Bread wrote...

I want make a game like pacman, now I want to end the game when all score disappear. This is my Code << Code Omitted >> It's not work, I want to know how to solve it. I am sorry that my English is not good.

The condition in line 1 will always be false. A List object is always returned by getObjectsInRange. You need to check the size of the list returned; or rather, check if it is an empty list

I need help with my code again. I can't get my actor to jump at all.

By jjc289, with 6 replies.
Last reply by Super_Hippo, 5 days ago:

In your checkFall-method, you say that it should jump whenever it is on ground. The only time the jump-method should be called is in line 25. Replace line 62 with this: <Code Omitted>

resizing actor (smaller)

By annika.g, with 3 replies.
Last reply by danpost, 5 days ago:

annika.g wrote...

Ok thank you, but that didn't really work.

What happened and what codes are you using? In what way is it not what you want? Did you set the image as the default image of objects created from the class?

Can I make this new actor the size of an actor that's already there and already has the correct size? Couldn't I just tell this new actor to adapt to the size of the already correct one?

Better to fix from above. If total fail, could try something along these lines.

I Need Help With Adding complexity to my game

By jackmads8, with 1 reply.
Replied to by danpost, 5 days ago:

jackmads8 wrote...

how I would add a timer (counting up) on screen

See my Value Display Tutorial scenario.

how I would save the score of that timer into a high score table.

Multiple factors will determine this -- mainly, location and structure of high score table.

The game starts lagging

By Alexkr, with 4 replies.
Last reply by Alexkr, 5 days ago:

I fixed it, thank you.

How do I have a prompt appear after a certain amount of time?

By arm0123, with 2 replies.
Last reply by danpost, 6 days ago:

arm0123 wrote...

With this part of your code, line 1 will not ever be true. The two String object are not the same object, regardless of the contents of the strings. Use the following to compare their contents: <Code Omitted>I cannot see any reason to have line 3 in this part of your code as the scenario would already be in a running state.

How do I move my work to another desktop?

By Faizcon, with no replies.

I am a beginner using greenfoot in high school and I am trying to put the work I did at home, on a different compute but I am not sure what to do, I tried using google drive, dropbox but was not sure exactly what to do since the best I could do was put the folder on google drive and open it from the other computer but the work is not saved.

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