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Throws an exception if not logged in

By AbdulrazaqAS, with 7 replies.
Last reply by AbdulrazaqAS, almost 3 years ago:

danpost wrote...

AbdulrazaqAS wrote...

I have uploaded the scenario, all the following classes are using UserInfo class; Area, FirstScreen, Board and Bomb.

Unfortunately, the UserInfo object may still be null even when storage is available. Therefore, after assigning the object to a variable using getMyInfo, check it for null before trying to work with the object (in each and every place you access it).

Thanks it works.

Not displaying User Image

By AbdulrazaqAS, with 5 replies.
Last reply by AbdulrazaqAS, almost 3 years ago:

Ok, thank you all.

Flocking

By alex_rimbu, with 1 reply.
Replied to by Super_Hippo, almost 3 years ago:

You can check out this one for a start: https://www.greenfoot.org/scenarios/13501

change Image

By luGGas, with 2 replies.
Last reply by luGGas, about 3 years ago:

Oh, right. I forgot about that. Thanks

remove Object

By luGGas, with 3 replies.
Last reply by luGGas, about 3 years ago:

Passt schon habe es mit <Code Omitted>gelößt.

Move/Rotate multiple objects as one

By hfgd, with 3 replies.
Last reply by danpost, about 3 years ago:

Yes, I have "block" that summons the tiles when created, falls down and can be controlled. But iI don't know how to rotate the tiles together with it

Show codes of "block" class.

BrickBreaker Game

By amberlin24, with 1 reply.
Replied to by RcCookie, about 3 years ago:

You don’t even need to remove the ball, instead put it back to the default position and reset the velocity.

Import Font from .ttf file

By crissty21, with 3 replies.
Last reply by danpost, about 3 years ago:

crissty21 wrote...

RcCookie wrote...

What error do you get?

I don't get an error. I just wanted to share it, so others won't spend a life time trying to figure it out. (as I did)

Just note that this will only work locally. It will not work when uploaded to the site as you cannot use the java.awt package here (the legacy version, which require a plug-in, may still work, however).

source code

By CYBERMAN99999, with 1 reply.
Replied to by Spock47, about 3 years ago:

It works fine for me. So you have to provide more information: What are you doing/where are you clicking? What is the reaction your computer displays/provides?

Scenario won't work on website but does in the app

By aleifericsson, with 9 replies.
Last reply by aleifericsson, about 3 years ago:

I have now changed every String.format() into String.valueOf() and now it works! Thank you so much for the help, guys!

I want to pass the score from my MyWorld world to my GameOver world

By KCee, with 3 replies.
Last reply by Spock47, about 3 years ago:

I added the code you wrote but it still doesn't pass on the score to the GameOver world

Well, it does, but you have to also use it, e.g. adding in the constructor: <Code Omitted>

How to add a collision to an object?

By shindayoni, with 7 replies.
Last reply by Spock47, about 3 years ago:

Like said: The solution is that the knight has to start in a free position and not already in the trees. However, here is a version that will work even if the player was stuck before the movement. Note that it is not a very efficient implementation and if there is not enough space for the player in the direction in which the player tries to unstuck, it will just stay at the edge of the world. Example: If the given image actually shows the bottom of the world, then there is not enough space for the Knight below the trees, therefore he cannot be unstuck. You need to make more space for her/h

syahwa_anugrah_ainu

Can't upload game with Gif image

By syahwa_anugrah_ainu, with 1 reply.
Replied to by danpost, about 3 years ago:

syahwa_anugrah_ainu wrote...

why when i upload a game, with added Gif image, it always ends up broken and can't be played?<Image Omitted>

It may or may not deal with Gif images. Some reasons a scenario will not play on the site are: * any use of the java.awt library; * any use of the javax.swing library; * any thread operations; Also, sometimes calling constructors or static methods on static variables can be a problem.

act and main method

By Roshan123, with 7 replies.
Last reply by Roshan123, about 3 years ago:

@Spock47, thanks for the answer. Will go into the details after some time..... @danpost, No. Not actually. I am trying to make a clone of greenfoot “act” method in BlueJ and I guess BlueJ doesn't have any feature/method like Greenfoot's act method

i want to increase the speed of an actor every time it spawns

By KCee, with 1 reply.
Replied to by Spock47, about 3 years ago:

You could keep track of the bubble speed in the world when spawning a new bubble: <Code Omitted> But there is a problem in your source code: The attribute speed in class Bubbles is actually not a speed, it is the opposite of speed. If you increase the value of Bubbles::speed, the bubble will move less often; so it results in a smaller actual spee

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