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Making a png transparent

By Roshan123, with 9 replies.
Last reply by Roshan123, over 5 years ago:

I just wanted to know that is it possible to do something after drawing in the background of the world And i got the answer thanks to both of the genius!!!

How to achieve slow transitions ?

By Paul12345, with 3 replies.
Last reply by danpost, over 5 years ago:

Looks like you are trying to hog the CPU to slow down the execution. Well, if successful, you would only achieve what using delay would do -- slow everything down. Remove the method and post class that called it.

Username123456789

Greenfoot.Bee scenario

By Username123456789, with 16 replies.
Last reply by danpost, over 5 years ago:

Username123456789 wrote...

so it looks like this? << Code Omitted >> instead of "private void stats"

No. Utter confusion. Why would you have bee lives in the Spider class?

Greenfoot read file error window

By javaNewbie246, with no replies.

I have a program for my college final that I am having issues with, I have so far that on a key press, it should begin to read from a txt file for location information about birds and where to place them in the world, however when I press the key, I get a null error and a seperate error window pops up and simply repeats some method returns I have that state the birds health and infection count. if anybody knows what I have wrong please let me know. Below are the image of the error window and code I have that I believe to be in question.<Code Omitted>

Working wall

By iDragon3o6, with 3 replies.
Last reply by Gbasire, over 5 years ago:

You can do a simple thing to make some collisions in the player class, add this : <Code Omitted>it will basically check where you were the second before touching the wall and warp you back there

Can I create GUI for my game?

By Honza, with 10 replies.
Last reply by Roshan123, over 5 years ago:

And what for blue Its not working

Ohhhh.... It will never work becaz i never gave u the code for blue button If u have further more doubts then creat ur own discussion

How to use setVolume() to control volume?

By akiki, with 1 reply.
Replied to by danpost, over 5 years ago:

Apparently, you do not understand what it means when you make a class extend another (subclassing). A subclass is to describe the same type object as its parent class. Since a VolumeUp object is NOT a Start object, neither should extend the other. A subclass usually describes the object more precisely. The Object class is the root of ALL classes. Classes describe objects. The Actor class, which extends Object, describes any generic actor. All its subclasses will describe some actor type more specifically. Actor might be subclassed by

One Actor in multiple worlds

By JetLight, with 1 reply.
Replied to by RcCookie, over 5 years ago:

That’s no problem. Just use addObject to add the actor to the different world. It will automatically be removed from the old world, but all of its values will not be changed. You can simply add it back into the main world at a later point

Greenfoot shooting

By Xarloz, with 1 reply.
Replied to by danpost, over 5 years ago:

Well, you cannot use rotation of survivor as it is always zero. You cannot use the set image as you are creating new ones every act cycle. That, in itself is not good as image processing is a hog on CPU time. I noticed, also, that you are allowing 8-way movement, but only use 2 images. Your actor only looks left or right. Are those the only directions allowed for a projectile?

Issues with classes communicating

By Hissss, with 4 replies.
Last reply by Hissss, over 5 years ago:

Thank you so much! Works wonderfully!

hbhk

By NewbJava, with 2 replies.
Last reply by danpost, over 5 years ago:

RcCookie wrote...

Well, you didn’t write the problem, but you never add highScoreDisplay to any world. Also, I don’t see a reason to have these field static.

Classes that extend this class add the highScoreDisplay to the worlds. Fields are static to retain scores across world levels, resets and replays.

Highscore

By NewbJava, with 111 replies.
Last reply by danpost, over 5 years ago:

NewbJava wrote...

What would be the purpose of the code in MyWorld in lines 32-35.

That constructor, along with the one including the boolean parameter, have a two-fold purpose. The main purpose is to avoid the main constructor (lines 11 to 28) which would cause a reset of the high score. The other is to make extending the class a simple matter of changing what the class extends. It also allows for extending World types to be of different dimensions (as well as bound states).

can I set an Image for the mouse?

By PascalFischer, with 7 replies.
Last reply by danpost, over 5 years ago:

RcCookie wrote...

Yeah, but what I meant was that you cannot just get one MouseInfo instance and use it for the rest of the time. Also it seems unreasonable to first check if the mouse moved and then get the mouse info again.

Either way, you perform one check that verifies that a MouseiInfo object will not be null. Also, in this case of PascalFisher, no actor repositioning is required unless the mouse is moved.

Loops

By saady, with 2 replies.
Last reply by saady, over 5 years ago:

Thanks, I think I know what I can use a while loop for now.

how do i do an or statement?

By MrSkyPanda, with 4 replies.
Last reply by RcCookie, over 5 years ago:

I see what you tried - „if either one of the left and right arrow key is down then execute this“. However, what you say with this in the inner part of the statement is „left or right“, and that would be an or between two strings. You can only use the or operator between two boolean values though. So the proper statement would be: „If either the left key is down or the right key is down then execute this“. Try to express that in java now.

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