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Image doesn't switch

By Hitsheep, with 2 replies.
Last reply by Hitsheep, 3 months ago:

danpost wrote...

Hitsheep wrote...

I'm trying to make a bar that switches to 3 other images as time goes while the button C is held down. However, the image doesn't switch. Can someone explain what went wrong? << Code Omitted >>

Using a SimpleTimer is making things more difficult than they need to be. You can just count act steps to time the fishingBar:

Unable to add object to world

By Hitsheep, with 2 replies.
Last reply by Hitsheep, 3 months ago:

danpost wrote...

Hitsheep wrote...

Can someone explain why the class Rod is unable to add the object fishingBar into the World? << Code Omitted >>

Sure. Line 12 declares a field (instance variable member) named curWorld, which is assigned an initial value by calling the getWorld method. Problem is that this assignment is done before the Rod actor is placed into a world, meaning the field is assigned a null value (that is, no World object is assigned to the field). There seems to be no logic to your codes, on a whole. Most of the fields are not use

ice attack

By Magzlum, with 12 replies.
Last reply by danpost, 4 months ago:

Magzlum wrote...

https://www.greenfoot.org/scenarios/31564 this is my game in case you didnt understand what it looked like, and what i have so pls give me some things i can put in my game and a better ice code

Cannot better codes unseen. It would help if you uploaded your scenario again (update it), but with the Publish source code check box checked.

How to draw integers

By Deepfist, with 1 reply.
Replied to by danpost, 4 months ago:

Deepfist wrote...

I have a player actor who has multiple integer values, such as the amount of medkits, the amount of multishots left, the amount of bullets left in a specific magazine, the remaining speedUp time and the score. These integers work fine, but I am not sure how to show them on screen with their right amount. These integers are in the player.class, but their values are changed by different actors; so when you pick up a medkit then the medkit.class will add 1 medkit to the count, not the player.class itself (this is done with a getOneIntersectingObject code, not sure if that's import

How to Make Drawing Game

By MyProject, with 1 reply.
Replied to by danpost, 4 months ago:

MyProject wrote...

Can we make a drawing application with greenfoot? For Example, if we want to make a program to draw letters of the alphabet for students. If it's possible, please show me how the algorithm is?

Of course, it is possible. However, what you need to do is attempt to do it yourself. Then, if you have issues, post what you had tried and explain how it is not what you want. Since you will be dealing with images, you should familiarize yourself with the GreenfootImage class. Look over what constructors and methods are provided in the class.

Changing the order of subclasses of World (or Actor)

By doctorbeep, with 1 reply.
Replied to by Deepfist, 4 months ago:

I am not sure if there is an option for choosing the order, but I do (kinda) know how the order is decided It depends on the word/character. If you have a subclass that starts with an A and a subclass that starts with a B, then the A will be the top one. If you have a subclass that starts with an a and a sublclass that starts with a B, then the B will be the top one. Not sure why but it's like that. If you have Level 1 and Level 2, then the top one should be Level 1, unless your Level 1 starts with a small L, then it will be Level 2 Say you have Level Start and Level end, then Level End

Help with game

By Lilia, with 10 replies.
Last reply by Lilia, 4 months ago:

YAY! I just figured it out myself! Thank you very much for your help though @danpost; you really made my day. Without you, i probably would have really panicked very hard!

Interaction between 2 characters and spawning a new one

By vachiotis, with 1 reply.
Replied to by danpost, 4 months ago:

vachiotis wrote...

I have a program where I want a character, lets say a male fish, interacts with a female fish and I want them to spawn another fish (either male or female, it doesnt really matter). I am new to programming and I can't find a solution to this problem. Can I get some help?

Since your Fish objects have a "sex" state, you should have a variable for male/female: <Code Omitted>Let's say that male = 1 and female = 0. Now, you can add the following to the act method:

help with if statement

By Psg1223, with 4 replies.
Last reply by danpost, 4 months ago:

Psg1223 wrote...

it returns as getobjects is always equaling zero and never changes the string variable

It does set a String variable called player to "Ninja" -- just not the one you think it should. Line 35 declares a new variable called player which is not the variable you declared on line 10. Remove the "String" from line 35 so the one on line 10 gets set.

Aquarium Lab

By r0b75hg7, with 2 replies.
Last reply by r0b75hg7, 4 months ago:

Thanks, I got it.

Pollinating Bees Lab

By r0b75hg7, with 1 reply.
Replied to by r0b75hg7, 4 months ago:

Trying to get the physics in my platformer right

By Nextonic, with 17 replies.
Last reply by danpost, 4 months ago:

Nextonic wrote...

Looks something like this java.lang.RuntimeException: The gif file "images/RunRight.gif" doesn't exist.

Double check the file name and suffix. All characters must be in the proper upper/lower case.

trying to get radio button in java to work

By divinity, with 15 replies.
Last reply by danpost, 4 months ago:

divinity wrote...

I see the error and put in the curly (}) that I had miss out but now am getting another error << Code Omitted >>

Looks like you are trying to treat the Banking object as a java.awt.Component object, which, as coded, it is not.

Enemy wave system

By Deepfist, with 2 replies.
Last reply by Deepfist, 4 months ago:

The code is amazing, my DelayTimer is a bit different however. Nonetheless it's still wonderful and it has helped a lot (was stuck on this for a while). Thx a lot :D

Programing an endless route with 2 gifImages

By Ururu, with 7 replies.
Last reply by danpost, 4 months ago:

thats right. I managed to simplify it based on whats within my knowledge and it works now :)

Please provide what you simplified it to.

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