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getWorldCanvas()

By Nosson1459, with 1 reply.
Replied to by danpost, almost 2 years ago:

Nosson1459 wrote...

I'm trying to fix up someone elses old greenfoot code and I came across an error that I don't know how to fix, the person calls a method called getWorldCanvas() from the WorldHandler class Greenfoot doens't know what it is. What is it trying to do and is there a replacement method for it?

I did not research it; but, I believe that it returns a java.awt.Canvas object. Being as you cannot upload anything using the java.awt package without running into security issues in javascript/HTML, any scenario using that package will fail to work on a

I am getting an error

By Shaormentiul, with 5 replies.
Last reply by Shaormentiul, almost 2 years ago:

Thanks for the help, it doesnt give me the error anymore. The fact that the attack will hit the player creating it wont matter, because it will only affect P2.

Making an attack delay

By Shaormentiul, with 5 replies.
Last reply by Shaormentiul, almost 2 years ago:

Nevermind, I made it work. Thanks for the help a lot!

Saving the caracter

By Guy68, with 9 replies.
Last reply by danpost, almost 2 years ago:

Yes but PlayerA is not working because i have two caracters, and i want to choose between them. I wan to play the other levels with the same caracter, without going back to choose the player again. I tryed my best to combine the code but it is not working. Maybe we can go with little steps. I have 2 caracters (Man and a Woman) And i have 3 worlds(MyWorld1,2,3) and I am choosing the caracters in the world Starting. I want to do if i clck on the man in the world satrting that i can play with the man at all 3 worlds and i am able to travell between them(the travelling between worlds

Edge of the world

By Guy68, with 2 replies.
Last reply by Guy68, almost 2 years ago:

Thank you! The problem is solved and its working just fine.

Kill multiple actors with a health system in place

By Deepfist, with 1 reply.
Replied to by danpost, almost 2 years ago:

Deepfist wrote...

I am trying to make a kill system where, if a bullet hits the Stalker or Sniper, it kills them when their health is low enough. With the Sniper it works, but with the stalker I get the error : << Error Trace Omitted >> The code for both is the same, but with different names and it references the right Actor. The codes for the involved actors will be standing below (The actors it extends to have nothing to do with the code itself) This is the code of the bullet that kills the enemies (not the class Enemies) << Code Omitted >> This is the code of myWorld, it might have some

Casting

By SANELE, with 1 reply.
Replied to by danpost, almost 2 years ago:

SANELE wrote...

can someone please explain to me Casting with examples.

Let's say you had in your MyWorld class a method that you wanted to call from an Actor subclass. Maybe your character dies and you want the world to show a game over screen, so you want to call the gameOver method:

Code only execute on first instance

By Makuro, with 3 replies.
Last reply by danpost, almost 2 years ago:

Makuro wrote...

<< Codes Omitted >> Thanks for your reply and here are the Game Manager and Background class respectively

I really do not see the need of the Game_Manager class. All the information stored in fields there can be determined on the fly, with fair programming. A Game_Over class extending Actor could be used to show victory or failure and at the same time be used to stop the scenario when added into the world with (in Game_Over class): <Code Omitted>Instead of setting fields

Laggy Greenfoot

By Wiwhyweirdo, with 2 replies.
Last reply by danpost, almost 2 years ago:

Wiwhyweirdo wrote...

After some more testing I have noticed that whenever I receive damage the game speeds up at gets less laggy. Do what you want with this Information .

You might be doing something with images that is causing the lag issue. Make sure you pre-load your images. Make sure you always reference those pre-loaded images when setting an image. Keep your world at a reasonable size. I stick to not much more than (900, 600) world size (depending on the scenario). If using an unbounded world, make sure all actors are removed from the world after they leave the viewport

Greenfoot scenario freezing in browser

By epm, with no replies.

Hey, I tried to share my scenario but it keeps initialising. After a long time it loads but when changing the world it start freezing again. I really don't know why :( It is working in Greenfoot. You can find my scenario here!

How to reset a World while the Program is running?

By Bankspeers, with 5 replies.
Last reply by Bankspeers, about 2 years ago:

Thank you, now it works

How to detect if all objects are gone

By Psg, with 11 replies.
Last reply by danpost, about 2 years ago:

hey, dan I need your help. I have a problem. I believe this if statement is working, but reading the wrong value of the integer rotate. What should i do

First, you should understand that the rotation is already being held in the Actor class, meaning you do not need to declare another field for it. You could use something like the following: <Code Omitted> It is not really clear by your code as to exactly what you are trying to achieve with the turn methods Obviously, you want the crab to turn sharp at an edge, whic

How to stop actors from "sliding" after calling the move() function and changing orientation

By TheGrrMan, with 5 replies.
Last reply by danpost, about 2 years ago:

TheGrrMan wrote...

your QActor class, how do I access this?

It can be found in my Asteroids w/Improved QActor class scenario. Again, it is not to be modified in any way -- just used as is. Download the scenario and open in greenfoot. Then, you can copy/paste the class into your scenario. It does work differently than the SmoothMover class, however. Open the class and read through the instructions carefully. Actor subclasses requiring it should extend the QActor class.

How do you rotate an object to spawn in a different way?

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

Yes, thank you so much!

jeremyneedshelp

How do you make an object move along with another object

By jeremyneedshelp, with 1 reply.
Replied to by danpost, about 2 years ago:

jeremyneedshelp wrote...

I cannot make my frog to move along with the boat that allow the frog to cross the river. i managed to get the frog to go on top of the boat but it wouldnt move at all. it would just get stuck on the boat and it would die.

You need to show your current codes for both the frog and the boat. Also, you can look at other codes that do similar things. For example, my Jump and Run Demo w/Moving Platform scenario has an independently moving actor moving on a platform.

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