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Smooth movements

By aexelmaexel, with 1 reply.
Replied to by danpost, almost 7 years ago:

This: <Code Omitted>from the nachrechts method, is equivalent to this: <Code Omitted>A similar thing can be said for the loop in the nachlinks method. Instead of Position values of 0 and 1, it would be better to have Direction values of 1 and -1. Also, instead of a constant verschiebung value, you can have it decremented to zero during a move (setting it to 88 when a move is initiated). The multiple similar if statements can also be simplified. You woul

Digital_rookie4

Greenfoot crashes as soon as I go onto one of my own projects

By Digital_rookie4, with 9 replies.
Last reply by Digital_rookie4, almost 7 years ago:

Its fine now I have found an older but more awkward version that does work

Random Function

By JPEG, with 2 replies.
Last reply by JPEG, almost 7 years ago:

Sorry, that's not what I'm asking :)

Using a variable defined in a World class in an Actor Class

By oltmanac, with 6 replies.
Last reply by oltmanac, almost 7 years ago:

Thank you so much! Everything works now! I really appreciate you taking the time to help me.

How to use mousePressed?

By Fargesia, with 1 reply.
Replied to by danpost, almost 7 years ago:

Fargesia wrote...

I don't understand how to use the Greenfoot.mousePressed command. Like what do I have to put in the brackets? I know that I have to put the object but how do I write it?

The Greenfoot class documentation says this:

Parameters: obj - Typically one of Actor, World or null

Most of the time, it will be 'null', meaning any click anywhere, or 'this', referring to the object, created from that class or one of its subclasses, that the current block of code is being executed on (or for). If not one of those, it will be a named reference to an

wombat leaves java code

By rsmithlax, with 8 replies.
Last reply by codinglover456, almost 7 years ago:

This is not a joke. its over for u young man

Need Help (says illegal start of expression)

By wcs0040, with no replies.

public class Ball extends Actor { /** * Responds to motion control from the arrow keys and removes * any buttons from the world when it intersects them. */ public void act() { handleKeyPress(); lookForButton(); } /** * Handles input from the arrow keys. */ public void handleKeyPress() { checkLeftArrow() ; checkRightArrow() ; checkUPArrow() ; checkDownArrow() ; } } /** * Checks to see if the left arrow key is being pressed. * If it is, then the ball sets its rotation angle to zero degrees * and moves backward 5 units. If it is not being pressed, * this method does nothing. */ public void checkLeftArrow() { public void act() { if (Greenfoot.isKeyDown("left") { setRotation(0); turn(-5); } } } /** * Checks to see if the right arrow key is being pressed. * If it is, then the ball sets its rotation angle to zero degrees * and moves forward 5 units. If it is not being pressed, * this method does nothing. */ public void checkRightArrow() { public void act() { if (Greenfoot.isKeyDown("right") { setRotation(0); turn(5); } } } /** * Checks to see if the up arrow key is being pressed. * If it is, then the ball sets its rotation angle to 270 degrees * and moves forward 5 units. If it is not being pressed, * this method does nothing. */ public void checkUpArrow() { public void act() { if (Greenfoot.isKeyDown("up") { setRotation(270); turn(5); } } } /** * Checks to see if the down arrow key is being pressed. * If it is, then the ball sets its rotation angle to 90 degrees * and moves forward 5 units. If it is not being pressed, * this method does nothing. */ public void checkDownArrow() { public void act() { if (Greenfoot.isKeyDown("down") { setRotation(90); turn(5); } } } public class Button extends Actor { /** * Checks to see if the ball is "touching" an object of the Button class. * If it is, then the ball removes from the World a Button that it touches. * If the ball isn't touching an object of the Button class, then this * method does nothing. */ public void lookForButton() { Actor B =getOneIntersectingObject(Ball.class) if (isTouching(Ball.Class)) { removeTouching(Ball.class) } } }

Helper class Mover. Where did it go?

By TNesler, with 2 replies.
Last reply by TNesler, almost 7 years ago:

Thank you very much! Tom Nesler

GIF not working on site

By valdes, with 1 reply.
Replied to by nccb, almost 7 years ago:

GIFImage uses an API to load files from disk. This is not currently supported in the online version. (GreenfootImage is a special case that is overridden to load files from the uploaded JAR). It would be nice to support this, but unfortunately we don't currently have plans to add this functionality. The only hack I can think of right now to support GIFs is if you turned the GIF into a Java file containing the file content as an array, then modified GIFImage to allow passing in an array of data rather than a file name. This may not be impossible for some of the more advanced Java program

Greenfoot default scenario path

By Fibley, with 2 replies.
Last reply by Fibley, almost 7 years ago:

Greenfoot remembers the last location to open/create projects, using the bluej.projectPath setting. This is stored in each user's greenfoot.properties, but you can effectively set an initial value for this property for all users by adding it to your greenfoot.defs, e.g. <Code Omitted> This won't prevent users later trying to open/save to other locations but it will give them a nudge towards the right location.

Nice one! This is exactly what I was looking for. Thanks for the fast response!

Why does my character fall through the world?

By PostieMalonie, with 6 replies.
Last reply by danpost, almost 7 years ago:

PostieMalonie wrote...

What line would that be on nccb?

Your jumpStrength is a positive number, which means the character jumps downwards. You need to make jumpStrength negative in order to jump upwards.

(line 21 -- along with line 111)

Your jtimer does not work correctly because you increase it in act, and then check if it's above zero later on in checkKeys, which it always will be. You probably want to change the threshold for jtimer in checkKeys to be more like 30 to make a longer delay between possible jumps.

(line 36 -- along with line 58 and

Actors pass through walls

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

danpost wrote...

Aftermath wrote...

I did comment on this, but when the actor hits the wall it will not go through it, but when it starts to reverse, or faces the other way and drives forward, it goes through the walls as if it was driving normally.

It is best to first do an action (turn or move), then check for an obstacle. If one is encountered, then undo the action. That way, you are always not over an obstacle after each act step.

Thank you, this fixed it.

Game not runniing

By IshaanMishra, with 2 replies.
Last reply by IshaanMishra, almost 7 years ago:

Ah I see. I have 4 classes which use the GIFImage Class. Thanks!

Access an actor's variables in another actor

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

Notted wrote...

I found a problem with my movingBomber() code. It seems that whenever the gotoX is equal to the actors x (from getX), he hits an invisible wall, and then spasms insanely, making him stuck. << Code Omitted >> The gotoX = 220 (100 less than of the width of the game world).

Try changing line 3 to this: <Code Omitted>

GIF not working on site

By valdes, with no replies.

For greenfoot site administrators: I have games that are using the GIFImage import class. The games work fine on Greenfoot, but when they are uploaded to this site, they crash. Using the latest version of that class, in Greenfoot 3.5.3. Is there are trick for using GIFs on the site? I give links to games with that problem: game1 game2 This guy discussed the same problem: game3

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